Showing posts with label exercise. Show all posts
Showing posts with label exercise. Show all posts

Friday, 16 September 2016

The Brain in Super Agers

My Twitter post on a recently published study of brain structure in a group of high performing older adults received quite a bit of attention (see below).

Felicia Sun and colleagues at Massachusetts General Hospital and Harvard Medical School selected an interesting research design.

A group of elderly subjects between the ages of 60 and 80 years were identified as showing "superaging". This was defined as scoring like young adults on two neuropsychological tests: The Long Delay Free Recall measure of the California Verbal Learning Test and part B of the Trail Making Test.

They then imaged the brain structure and function of the super agers using MRI. The results were compared to two groups: elderly adults without superior cognitive performance and younger adults with age-typical neuropsychological performance.

A key finding from their study was that super agers had brain hippocampal volumes greater than typical older adults and this measure was comparable to young adults.

Super agers also had greater brain volumes than typical older adults in the following regions:
  • Anterior temporal cortex
  • Medial frontal cortex
  • Anterior midcingulate cortex

The authors noted in the discussion section:
"We found support for our hypothesis regarding the structural integrity of the default mode and salience networks, with superagers showing much less atrophy than typical older adults in key nodes of these networks, which we refer to as the "superageing signature".
The authors also note their longitudinal study was not able to identify the factors that may play a key role in super agers. Candidate factors include genetic factors, exercise, diet and social activity levels. These factors are likely to be studied in future research.

Readers with more interest in this study can access the free full-text manuscript by clicking the citation link below.

Figure of hippocampus is an iPad screen shot from the app 3D Brain.

Follow me on Twitter @WRY999

Sun FW, Stepanovic MR, Andreano J, Barrett LF, Touroutoglou A, & Dickerson BC (2016). Youthful Brains in Older Adults: Preserved Neuroanatomy in the Default Mode and Salience Networks Contributes to Youthful Memory in Superaging. The Journal of neuroscience : the official journal of the Society for Neuroscience, 36 (37), 9659-9668 PMID: 27629716

Friday, 24 June 2016

Aging and Cognition: Free eBook Resource

Yesterday I posted on Twitter a link to a post on the Dana Foundation website.

In this post, they reviewed highlights from a seminar on cognitive aging sponsored by the American Association for the Advancement of Science (AAAS).

There is a YouTube video of the seminar that I will be reviewing in the next few days and will likely write up a summary of my notes from the video.

One important item I picked up was the recommendation of a free PDF book titled:
Cognitive Aging: Progress in Understanding and Opportunities for Action.

You can access this free aging and cognition book resource by clicking HERE.

The link to the Dana Foundation post is HERE.

Follow me on Twitter (@WRY999) HERE.

Monday, 4 January 2016

Get Fit While at Work

These days, it seems as though more and more people are working longer hours and using the old "no-time-to-exercise" excuse.

Unfortunately, this lack of physical activity can be harmful to your health, as it increases the risk of obesity, back pain, poor posture, leg cramps and tense muscles, among other things.

Wouldn't it be great if you could find a way to fit in some type of workout during those 8+ work hours?

Well, the good news is…you can. It just requires a slight change in how you work or get to work, to make a meaningful improvement.

Cardio

Schedule walk-and-talk meetings. Who says a meeting needs to be held around a table? Take a brainstorming stroll with a colleague. If you need to take notes, schedule the meeting at a park where you can sit on a bench.

Avoid the elevator. The Centers for Disease Control and Prevention recommends adults get two hours and 30 minutes a week of moderate-intensity exercise to stay fit. Stair climbing for just 10 minutes, three times a day, for example, will total 30 minutes of heart-strengthening exercise, putting you well on your way to reaching that mark.

Take a stand. Set a timer to remind yourself to get out of your chair every 30 minutes. Use this time to walk to the water cooler or check in on a project.

Flexibility

Workout at WorkReach for the sky. Sitting at a desk all day can lead to neck pain between the shoulder blades. You can reduce the pain by reaching both arms up to the ceiling and arching your back. Then bring your arms down and stretch forward, opening the upper back. Do this every 20 minutes.

Stretch out your shoulders. Sit straight in your chair and reach one hand behind your back with your palm out. Then reach your other hand up and bend it down, trying to touch both hands. Hold for 10 seconds.

Point your fingers. Typing for eight straight hours can be harmful to your hands, wrist and forearms. Stretch one hand in front of you, pointing your fingers toward the ground. Use your other hand to gently push your fingers down and toward your body. Repeat on the other side. Then, stretch your hands upward doing the same.

Strength

Tone your arms wherever you can. A great way to sneak fitness into your day is to do a few push-ups here and there. Remember, all you need is a flat surface – and it doesn’t need to be horizontal. Simply lean against a wall, desk or other sturdy surface and get a few reps in.

Rise up out of your chair. Even if you are stuck in your chair all day, you can still get some core work in. Throughout the day, simply lift yourself off your chair with your arms.  If your chair is on wheels, it'll be even harder to hold your body still.

Get your legs up. While sitting in your chair, extend one leg out straight in front of you and hold for a few seconds. Then raise it up as high as you can and hold it again for a few seconds. Repeat with each leg multiple times.

These simple actions can significantly increase your physical health. Squeezing in a little exercise also improves concentration and could actually improve your productivity.


Wednesday, 30 December 2015

Top 10 Brain Posts 2015: Exercise and Brain Integrity

A final Top 10 Brain Post in 2015 focussed on a study of the correlation between exercise habits and integrity of brain white matter.

This study found that brain white matter integrity decreased with age.

However, some of this deterioration in integrity was minimized in older adults with higher measures of fitness.

The original post on this research can be found 

HERE

Follow the author on Twitter WRY999

Photo of jogger on beach in Fort Myers, Florida is from the author's files.

Monday, 16 March 2015

Your Pup May Be the Best Workout Buddy

Cynthia Otto, DVM, PhD, BS, discusses the importance of physical activity for you and your furry friends.

America’s obesity epidemic, tied largely to a sedentary lifestyle and lack of meal portion control, is not limited to humans – it’s also an issue for our dogs and cats.

Unfortunately, because the general public is so used to seeing overweight pets, dogs that are physically fit and at an appropriate weight tend to be seen as “too thin.” A healthy dog should have a defined doggy waistline and should have just slightly padded doggy ribs (the same goes for our feline friends).

Research has shown that dogs who are just 10 to 15 percent overweight shave up to two years off their lives. With an average life expectancy between eight and 18 years (depending on size and other genetic and external factors), a couple of years makes a big difference.

The Benefits of Working Out with Your Pet

Now, add the benefits of exercise to the health benefits of pet ownership.

Work out with your petStudies have shown that people who own pets have increased levels of physical fitness, as well as a decrease in loneliness, anxiety and depression. Spending quality time with your pet through exercise can help keep both you and your furry family member healthier by lowering blood pressure, reducing both the risk of obesity and heart disease, and ultimately, having a positive effect on mental wellbeing and connectedness through the human-animal bond.

Together, these things can impact the relationship with your pet by increasing oxytocin release in your brain and your pet’s. Oxytocin is a nurturing hormone that makes you feel good. Petting and playing with your pet can release the hormone. Plus, the interaction through play and physical activity helps dogs release energy, which helps them be better behaved in general.

Since they don’t have a job and can’t read or do Sudoku puzzles, pets rely heavily on you for physical and mental exercise.

Activities for You and Your Pooch

Struggling to come up with fun ways to keep you and Fido active for the recommended 150 minutes of aerobic exercise each week? Here are a few suggestions:
animals need exercise too
  • Go for a couple long walks or jogs a few times a week
  • Let your dog be your ball retriever during tennis practice
  • Practice your Frisbee throw
  • If your dog enjoys water, go for a swim together
  • Include your pet in biking, hiking and trail running adventures 
Before embarking on any exercise program, it is always good to check in with your -- and your dog’s -- physician to ensure that everyone stays safe.

Wednesday, 18 February 2015

Exercise Guidelines in Prevention of Alzheimer's Disease

A series of seven guidelines for the prevention of Alzheimer's disease (AD) has recently been published.

These guidelines resulted from a conference of experts in nutrition and the brain.

The guidelines included a recommendation for 40 minutes of aerobic exercise three times a week.

Support for this exercise recommendation by experts was linked to 2 areas of research:
  • Observational studies show lower rates of AD in regular exercise groups compared to sedentary groups
  • A single clinical trial found reduced brain atrophy and improved memory following an intervention where elderly adults were randomized to a 40 minute three times a week protocol

I recently summarized another manuscript looking at the association of exercise and brain imaging in those with the APOE genotype linked to Alzheimer's disease. This study was published following the expert conference manuscript.

There certainly need to be more randomized clinical trials of exercise therapy in groups at high risk for cognitive decline and Alzheimer's disease.

Here is the list of all 7 prevention recommendations from the manuscript. Readers can access the free full-text manuscript by clicking on the PMID link below.

Prevention Recommendations for Alzheimer's Disease
  1. Minimize dietary saturated and trans fats
  2. Increase intake of vegetables, fruits, legumes and grains
  3. Daily vitamin E intake from foods of 15 mg
  4. Daily vitamin B12 in diet or supplement with blood B12 level monitoring
  5. Daily multivitamins not recommended but if used avoid those with iron and copper
  6. Aluminum link to AD is controversial but avoid antacids and baking soda that contains aluminum
  7. Aerobic exercise of 40 minutes at least 3 times per week

I have previously summarized 10 prevention strategies in AD that include non-nutrition based features that can be found here.

Photo of butterfly is from the author's files.

Follow the author on Twitter @WRY999

Barnard ND, Bush AI, Ceccarelli A, Cooper J, de Jager CA, Erickson KI, Fraser G, Kesler S, Levin SM, Lucey B, Morris MC, & Squitti R (2014). Dietary and lifestyle guidelines for the prevention of Alzheimer's disease. Neurobiology of aging, 35 Suppl 2 PMID: 24913896

Monday, 9 February 2015

Exercise and the Brain: Research Links

I am posting links to some of the most recent research related to exercise effects on the brain.

These come from a process of selecting posts to examine in more detail this month.

Clicking on the links will take you to the PubMed abstract. Most of the abstracts also have free full text links.

Enhancing brain activity through multidisciplinary interventions in the elderly

This Chinese study examined the effects of cognitive training, Tai Chi exercise and counseling on a group of 17 elderly individuals compared to controls. The study examined brain low frequency fluctuations and found improved intrinsic activity in the intervention group for the middle frontal gyrus, superior frontal gyrus and anterior cerebellum. The study noted the value of a group intervention for increasing social support ratings.

Single episode of exercise changes resting state brain networks

This study examined the effects of a 20 minutes of moderate intensity aerobic exercise on resting state connectivity of the brain using functional MRI. Exercise produced significant changes from baseline in several brain regions and connections suggesting a valid model for testing the brain effects of acute exercise.

Dietary and lifestyle guidelines for prevention of Alzheimer's disease

This manuscript summarizes results of an expert consensus guideline on prevention of Alzheimer's disease. The experts recommended the equivalent of 40 minutes of brisk walking three times per week.

Physical activity, inflammation, and volume of the aging brain

This longitudinal study in older adults measured self-reported physical activity and a marker of inflammation known as tumor necrosis factor alpha (TNF-alpha). Greater levels of physical activity and lower levels of TNF-alpha (lower inflammation) were correlated with less brain atrophy. 

The effects of chronic exercise on attentional networks

This study examined the correlation between physical activity levels and performance on a task of attention in healthy young adults. The authors found support for exercise as a potential therapeutic modality to improve attention in health young adults.

Photo of sunset at South Padre Island, TX from the author's files.

Follow the author on Twitter WRY999






Friday, 6 February 2015

It’s Time to Get a Better Night’s Sleep

Did you know that how you feel during your waking hours depends greatly on how well you sleep? Increased energy and productivity along with an improved immune system are direct results of enjoying a sound slumber each night.

Sleep Better
John Molitoris, MD
Now, the only problem is how to get that better night’s sleep. Between hectic schedules, pressures at work and family responsibilities, it can be extremely difficult sometimes to drift off to dreamland.

"Historic views of insomnia held that sleep problems were a result of distinct medical pathologies, says John Molitoris, MD, a primary care physician at Penn Family and Internal Medicine Cherry Hill. "Current views are very different and hold that most problems with sleep can be remedied with some simple behavioral changes."

Although each person needs to experiment to figure out what works best for them, here are some tips to hopefully help you improve your sleep so that you can be more productive and full of energy all day long.

Keep a Regular Schedule

One of the most important things you can do to achieve good sleep is to stick to a regular sleep schedule. If you are able to go to bed and wake up at the same time each day, you’ll feel more refreshed and energized.

The best way to begin doing this is to record the time each night that you begin to feel tired. Once you see a pattern, try to go to sleep around that time. Even on weekends and holidays, attempt to stick to that time.

Sleep BetterThis also goes for getting up in the morning. If you sleep in when you can, you likely won’t be tired at your normal time, thus throwing off your sleep schedule. If you are getting enough sleep each night, you should eventually begin to wake up without an alarm. By being consistent, you are reinforcing your body's sleep-wake cycle.

If you are unable to fall asleep within 15 minutes of lying down, get up and do something that will relax you. Oftentimes, if you lay in bed agonizing over not being able to fall asleep, you might find it even harder to nod off. In addition, there are other sleep techniques that can help calm restless minds like counting backwards from 58 while linking your breathing to the numbers.

Be Smart About Napping

How many times have you plopped onto the couch only to doze off for a bit? Sometimes those little power naps can feel amazing. And, if you do need to make up for a few lost hours, a daytime nap is much better than sleeping late as it tends to have less of an impact on your sleeping schedule.

You do need to be careful though. If you sleep for too long or too close to your normal bed time, you are likely going to struggle to fall asleep at your usual time. If you are going to take a nap, it’s always better to do it earlier in the afternoon and to try to keep it to less than an hour, as a general rule of thumb.

Create a Relaxing Routine

Not only is it important to go to bed at a similar time each night, but it’s also recommended that you follow a similar routine before doing so. Find things that will make you feel comfortable and calm, and try to consistently do them. Perhaps it’s taking a warm bath or shower, reading a book or listening to soothing music. These types of activities can help you relax and effectively transition from being fully awake to becoming drowsy.

Also, attempt to make your sleeping situation as comfortable as possible. On top of having a bed that allows you enough room to stretch and turn without discomfort, try to keep noises at a minimum and your room at a cool temperature. If needed, consider trying room-darkening shades, earplugs, a fan or other white noise devices to create an environment that best suits your needs.

Exercise and Eat Right

By exercising as little as 20-30 minutes per day, you can help yourself sleep better at night. Simply being active – taking a walk, riding your bike or going to the gym – is going to help you fall asleep faster and lead to deeper sleep. If you feel that working out too close to bed acts as a stimulant, try scheduling your exercises in the morning or early afternoon. Take the time to figure out what workout schedule is best for you, as it will pay off in dreamland.

How you eat also has a major impact on how well you sleep. Be sure not to go to sleep feeling hungry or overstuffed because any discomfort may keep you up. Also, try to avoid eating or drinking anything too close to when you plan on going to sleep to avoid midnight trips to the bathroom. If you are hungry before bed, try something containing carbohydrates – a small bowl of cereal, a banana or a granola bar for example – as it may help to calm you down.

Know When to See a Doctor

Nearly everyone has the occasional sleepless nights. Sometimes, no matter what you do you can’t seem to clear your mind of falling asleep. If you encounter more than a few sleepless nights, have tried the tips above and are still struggling with sleep problems, it may be time to see a doctor who can help you get the better sleep you deserve.


The Penn Sleep Centers

The Penn Sleep Centers provide state-of-the-art diagnostic services and treatment for the full range of sleep disorders. The Centers are staffed by specially trained sleep physicians based in the departments of medicine, neurology, psychiatry, otorhinolaryngology – head and neck surgery, and oral and maxillofacial surgery. By gathering our physicians together from different departments, we are able to maximize the experience and knowledge of our staff. Depending on what factors are causing your sleep problems, we have experts on-hand to focus on your specific needs. Once the cause of your sleep problem is identified, this same team can develop a specific treatment program.


Wednesday, 4 February 2015

Exercise in the Elderly: BDNF and Executive Function

Exercise promotes cognitive function in children, adults and elderly individuals.

The mechanism for this effect is unclear. Some of the effect may be due to a general improvement in vascular function and health.

Another potential mechanism is via increased neuroplasticity mediated by neurotrophic factors.

Brain-derived neurotrophic factor (BNDF) is a known contributor to brain neuroplasticity. Levels of BNDF can be determined with serum assays.

RL Leckie and colleagues recently found support for BNDF mediation in an exercise in an interventional study with an elderly population.

The key elements of the design for their study included the following elements.

  • Participants: Adults between the ages of 55 and 80
  • Exercise intervention: Daily supervised walking sessions beginning with 10 minutes increasing to 40 minutes. Control intervention included stretching and toning sessions lead by an exercise professional
  • Cognitive assessment: Task-switching paradigm commonly used to assess executive function
  • Blood assay: Serum brain-derived neurotropic factor (BNDF) levels and BDNF genotype
  • Statistical analysis: Multivariate linear regression analysis with key dependent variable being cognitive performance after one year of intervention

The main findings from the study included:

  • Serum BDNF increased in the exercise group
  • This effect was limited to primarily the participants over 70 years of age
  • Enhanced executive function following exercise was demonstrated in those over 70
  • BDNF level increases in the over 70 age group correlated with cognitive performance

The authors note their does not mean exercise is not important for cognitive function in the younger age group (55-70 years of age). Their study only highlights the age interaction with BDNF in moderating a single executive function task.

BDNF levels decrease with age and the level of decrease in BDNF correlates with reduction in volume of the brain hippocampus. The hippocampus plays a key role in memory function and in decline in memory associated with aging.

It is quite possible that regular exercise after age 70 reduces the age related effect on cognition moderated by BDNF.

Readers with more interest in this study can access the free full text manuscript by clicking on the PMID link in the citation below.

Photo of ring kingfisher is from the author's files.

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Leckie RL, Oberlin LE, Voss MW, Prakash RS, Szabo-Reed A, Chaddock-Heyman L, Phillips SM, Gothe NP, Mailey E, Vieira-Potter VJ, Martin SA, Pence BD, Lin M, Parasuraman R, Greenwood PM, Fryxell KJ, Woods JA, McAuley E, Kramer AF, & Erickson KI (2014). BDNF mediates improvements in executive function following a 1-year exercise intervention. Frontiers in human neuroscience, 8 PMID: 25566019

Monday, 2 February 2015

Exercise in the Prevention of Alzheimer's Disease

Growing evidence links physical activity to improved cognitive outcome in elderly individuals.

Few studies have examined effects of exercise on those at highest risk for Alzheimer's disease.

J Carson Smith and colleagues recently published a prospective study of a cohort of older adults using structural magnetic resonance imaging.

The key elements of the design of their study included the following elements:
Participants: 97 adults between the ages of 65 and 89
Physical activity level: Frequency and intensity of leisure activity was assessed using the Stanford Brief Activity Survey
Alzheimer's risk status: Assessed using APOE genotype
Brain scanning protocol: Magnetic resonance imaging of brain using a 3T scanner at baseline and 18 months later. The brain hippocampal volume was identified as a key structure involved in APOE-related atrophy and memory decline
Statistical analysis: Participants were grouped in low and high physical activity groups and those with and without high-risk APOE Alzheimer's risk

The research team identified a statistically significant interaction between high-risk Alzheimer's participant and physical activity:
"Hippocampal volume decreased 3% in the High Risk/Low PA (physical activity) group whereas the volumetric changes in the remaining three groups were negligible."
The high-risk Alzheimer's group that participated in higher levels of physical activity appeared to have significant protection against hippocampal atrophy. To reach the higher levels of physical activity in the study they had to endorse one of the following levels:
  • Brisk walking 15 minutes daily three or more days per week
  • Jogging 15 minutes daily three or more days per week
  • Swimming 15 minutes daily three or more days per week
  • Moderately difficult chores 45 minutes daily three or more days per week
  • Regular jogging, running, bicycling or swimming 30 minutes or more
  • Playing sports such as handball or tennis an hour or more 

The authors examine the potential mechanisms for physical activity to reduce hippocampal atrophy in those with the high risk APOE genotype.

They note the beneficial effect of exercise may be through effects on cholinergic function, brain lipid metabolism or reduced neuroinflammation.

If this study is replicated it is an important finding with several implications.

One implication is that it may be one of the first research findings to support routine genetic testing for APOE and Alzheimer's risk. Those identified as high risk by APOE status could be targeted for aggressive behavioral interventions to increase physical activity along with increased surveillance of cognitive function.

Readers with more interest in this research can access the free full-text manuscript by clicking on the PMID link in the citation below.

Follow the author on Twitter WRY999

Photo of roseate spoonbill at sunset is from the author's files.

Smith JC, Nielson KA, Woodard JL, Seidenberg M, Durgerian S, Hazlett KE, Figueroa CM, Kandah CC, Kay CD, Matthews MA, & Rao SM (2014). Physical activity reduces hippocampal atrophy in elders at genetic risk for Alzheimer's disease. Frontiers in aging neuroscience, 6 PMID: 24795624

Wednesday, 31 August 2011

Add Exercise or an Antidepressant for Depression?

Although the psychological benefits of exercise are well recognized, the role of exercise in the treatment of psychological disorders is less clear.  Randomized control trials are limited and so clinicians are left without much data to advise patients on the proper role of exercise in a comprehensive treatment program.

Madukar Trivedi and colleagues recently published a study of exercise therapy in a group of individuals with major depressive who had not reached complete remission of depression despite treatment with a first-line pharmacological intervention using a selective serotonin reuptake inhibitors.

Subjects were randomized into a relatively high intensity aerobic program (16 kilocalories per kilogram per week) or a relatively low intensity program (4 kilocalories per kilogram per week) for 12 weeks through a program conducted at the nationally known The Cooper Institute in Dallas, Texas.

Here are the key outcome findings from the study:

  • Both exercise groups showed improvement in depression scores over the trial
  • There was a trend for the high-intensity group to have more improvement in depression
  • High-intensity exercise appeared to produce higher remission rates in men
  • High-intensity exercise appeared to produce higher remission rates in women without a family history of mental illness

Of note, the high-intensity group demonstrated a lower adherence rate than the low intensity group.

The authors note the size of the effect for adding exercise to single antidepressant drug appears similar in magnitude to that of offering a second antidepressant drug.  Second drugs commonly in use for the treatment of depression include antidepressants such as bupropion (Wellbutrin) or the newer atypical antidepressant drugs such as aripiprazole (Abilify).

For a 70 kilogram individual, 16 kilocalories per week of added exercise would be approximately 12 miles of walking per week.  The high intensity regimen in this study would approximate general exercise recommendations for physical health, (30 minutes per day of moderate exercise most days of the week).  So it seems reasonable to recommend this level of exercise for men with depression.  Lower levels of exercise may help some women with depression.  When higher levels of exercise prove difficult to attain, lower levels are better than none.

A key issue with exercise in depression is motivation and compliance.  Some individuals with severe depression face big hurdle in getting active.  For these individuals, use of a personal trainer or group exercise may provide the structure needed for higher exercise adherence.

Photo of Juno Beach Florida sun rise through filter from the author's collection.

Trivedi, M., Greer, T., Church, T., Carmody, T., Grannemann, B., Galper, D., Dunn, A., Earnest, C., Sunderajan, P., Henley, S., & Blair, S. (2011). Exercise as an Augmentation Treatment for Nonremitted Major Depressive Disorder The Journal of Clinical Psychiatry, 72 (05), 677-684 DOI: 10.4088/JCP.10m06743

Tuesday, 12 July 2011

New Exercise Guidelines Add Neuromotor Domain

Article first published as New Exercise Guidelines Are Here on Technorati.

The American College of Sports Medicine (ACSM) recently published an update on their recommendations for exercise.  These guidelines follow an extensive review of the research literature and update guidelines that were previously published in 1998.

The guidelines note four specific areas of exercise: cardiorespiratory fitness and reduction in risk of cardiovascular and metabolic disease, maintenance of muscular fitness, flexibility and neuromotor fitness.

The guidelines provide a very extensive review of exercise research.  I will summarize the key recommendations by area of exercise:

Cardiovascular fitness and reduction in risk of cardiovascular and metabolic risk factors:

  • Moderate intensity aerobic exercise for 30 minutes per day on five or more days per week or
  • Vigorous intensity aerobic exercise for 20 minutes per on three or more days per week or
  • A combination of moderate and vigorous aerobic exercise resulting in a total energy expenditure of 500 to 1000 MET minutes per week
The MET (metabolic equivalent of task) minutes per week is a method of quantifying exercise.   By definition, the amount of energy needed at rest is one MET.  Moderate intensity is assigned activities such as walking that can be rated in the 3 to 6 MET range.  Vigorous exercise (such as jogging or running) is rated at MET levels about 6.  A person walking at a 4 MET level for 200 minutes per week would expend 1000 MET minutes in a week meeting the exercise guidelines

Muscular fitness
Resistance training for each of the major muscle groups two or three times per week

Flexibility
Complete a series of flexibility exercises two or more days per week (60 seconds per each of the major muscle and tendon groups

Neuromotor Exercise
Exercise focusing on balance, agility and coordination for 20 minutes on two or more days per week

The benefits and recommendations have been expanded in this version of the ACSM guidelines.  The authors note the growing literature supporting the benefits of exercise such as tai chi and yoga in promoting balance and flexibility.  Balance and flexibility become increasingly important to counteract the effects of aging.  There is more research support for these types of exercise programs to reduce risk of falls and fall-related medical complications in older individuals.

The ACSM notes the limited compliance with exercise guideline compliance in the general population.  Although walking is ranked as the more frequency physical activity in adults, less than 10% of walkers meet the weekly guideline threshold for duration and intensity.

The ACSM makes some recommendations to increase compliance with the guidelines:

  • Patients and their physicians should work together to develop and monitor customized programs
  • Use behavioral strategies of "goal setting, social support, reinforcement, problem solving and relapse prevention
  • Further research targeting factors promoting maintenance of exercise compliance over extended periods
The ACSM has provided a valuable to put together a comprehensive exercise program with benefits in many areas.  Now it's time for more individuals to adopt a healthy lifestyle that includes meeting these recommended guidelines.

Photo of women getting exercise by walking from the author's private collection.

Garber, C., Blissmer, B., Deschenes, M., Franklin, B., Lamonte, M., Lee, I., Nieman, D., & Swain, D. (2011). Quantity and Quality of Exercise for Developing and Maintaining Cardiorespiratory, Musculoskeletal, and Neuromotor Fitness in Apparently Healthy Adults Medicine & Science in Sports & Exercise, 43 (7), 1334-1359 DOI: 10.1249/MSS.0b013e318213fefb

Saturday, 1 January 2011

180 Degree Metabolism: 2011 Edition

Kicking the New Year off right, I've added an additional 20% to 180 Degree Metabolism: The Smart Strategy for Fat Loss.  The addendum covers topics such as the role of stress in body fat accumulation, a discussion on types of exercise that encourage fat storage vs. the types that discourage fat storage, and more - including going over what I believe to be some mistakes made in the first version and what I now feel is more accurate.

If you've already purchased 180 Degree Metabolism or the full 180 Collection which includes all 180 materials, the link you were sent will take you to the new version, which was updated earlier today.  Send me an e-mail at sacredself@gmail.com if you have misplaced this link and I'll get it to you within a day or two (I'm traveling the rest of the day today).   

To purchase 180 Metabolism, go HERE and get the book along with the 6-hourweight loss audio seminar that accompanies it - by itself or as part of the full 180 Collection which includes all 180DegreeHealth materials (180 Degree Digestion, 180 Degree Diabetes, 180 Kitchen, 180 Degree Metabolism, the audio seminar, and the back issues of the 180DegreeHealth Report). 

Simply put, there is no better collection of health information materials on earth for establishing the right relationship with food, health, and healthy practices that you may be looking for as you get ready to set those dreadful "New Year's Resolutions."   

If you are new to 180 and would like to find out more about the book before taking the plunge, please take the time to listen to the short audio introduction I've put together at www.180metabolism.com

Happy New Year everyone.  May we all have a wonderful year full of fulfilling experiences - supported by a relaxed, enjoyable, and low maintenance attitude towards food and a healthy lifestyle.

Thursday, 23 September 2010

Promoting Health: Interval vs Steady Running vs Strength Training

The optimum physical exercise regimen for promoting health is a key public health issue.  Aerobic exercise can be obtained via running either using a steady pace or an interval-based approach.  Interval approaches typically includes high intensity exercise over shorter bursts of time.  Additionally, strength training provides a variety of health benefits and it’s role compared to aerobic exercise is unclear.

A Danish study was designed and recently published to compare the health benefits of interval training, prolonged steady paced running and strength training.  The key elements of the three interventions were:
  • Interval training: 5 minute warm-up followed by 5 two minute intervals at near-maximal running with heart rate above 95% maximum (3 times per week)—total exercise time over 12 weeks approximately 480 minutes
  • Steady running: one hour of continuous running three times per at 80% of maximum heart rate—total exercise time over 12 weeks 1800 minutes
  • Strength training: progressive heavy-resistance strength training primarily in lower extremities for one hour twice a week—total exercise time over twelve weeks 1500 minutes
Subjects participated in their respective programs for twelve weeks and had a variety of baseline performance, physiologic and lab measures collected.  The main findings showing differences between the groups were:
  • Maximum oxygen uptake improvement better in interval group than other two groups
  • HDL to total cholesterol improved in the steady running group, remained the same in the interval group and tended to worsen in the strength training group
  • Blood glucose (fasting and two hours after glucose load) improved in both running groups but not the strength training group
  • Body weight/body fat/muscle mass: Only the steady running group decreased body weight and fat percentage, strength group increased weight, increased lean body mass 
This study helps understand the relative contribution to health promotion for a variety of exercise programs.  Interval training provides the most bang for the buck in increasing oxygen uptake and in glucose metabolism.  Steady running seems superior to other techniques for weight loss and cholesterol reduction.  Strength training alone has limited health promotion benefits primarily in the development of lean body mass.

Since the health benefits of the three types of training studied in the experiment are complementary, it seems reasonable to consider a workout routine using all three types.  Although combining the three would lead to a significant time demand that many are unable to accommodate.  A good study is needed that answers the following question: “Given one hour to exercise, what is the optimum combination of steady running, interval training and strength training?”

Photo of fish from Oklahoma Aquarium (modified using psychedelic mode in iPad Photogene app) courtesy of Yates photography.

Nybo L, Sundstrup E, Jakobsen MD, Mohr M, Hornstrup T, Simonsen L, Bülow J, Randers MB, Nielsen JJ, Aagaard P, & Krustrup P (2010). High-Intensity Training Vs. Traditional Exercise Interventions for Promoting Health. Medicine and science in sports and exercise PMID: 20195181