Welcome to the HPRC Blog. We've got lots of information here, from quick tips to in-depth posts about detailed human performance optimization topics.
The scientific jury is still out on whether stretching prior to vigorous activity really helps prevent training-related injuries, but the scales tip in favor of doing some as part of your warm-up, just in case. HPRC has just added an in-depth review of the research literature and now offers information to help you decide the best way for you to incorporate stretching into your own fitness program. Check our our new Question from the Field, “Stretching during warm-up,” which also offers a link to even more detailed information.
Learn how to make healthy choices about nutrition and physical fitness with information you and your family can instantly apply. HPRC's Family & Relationships section has a new area on family nutrition where you can find tips on how to help yourself and those around you—your parents, children, spouse, and friends—build and maintain healthy food habits. Find more information on interactive tools, family meal planning, military resources, and research findings.
HPRC recently posted a list of dietary supplement products containing DMAA. Since we originally posted this list at the end of December, some changes have occurred that deserve note. Some products are no longer available on the manufacturer’s websites, while others appear to have been reformulated to eliminate DMAA from their recipes. To download the updated list, go to the Dietary Supplements Resources page under the “Resources” tab, or just click on this link to directly access “Dietary Supplement Products Containing DMAA.”
What do you put in your body to boost your performance, increase your energy, shed pounds, build muscle, or otherwise supplement your diet? What’s in that drink, pill, or powder? What will it do for you? What will it do to you? Is it worth the risk?
More and more Warfighters are taking dietary supplements, most without being fully informed that some of the ingredients could have harmful side effects. HPRC has just unveiled its Dietary Supplement Classification System to provide this kind of information and help you make informed decisions about a particular supplement. To start exploring this new resource, visit HPRC’s new web pages. If you have a question, contact us via “Ask the Expert.”
The Food and Drug Administration (FDA) is advising consumers to stop using multiple weight-loss products that contain the undeclared drug ingredient sibutramine, which was removed from the market in 2010 for safety reasons and may present significant risks for those with coronary artery disease and other heart issues. The following 18 products have received FDA Public Notifications advising consumers not to purchase or use any of them:
- Lose Weight Coffee
- Dream Body Slimming Capsule
- Pai You Guo Slim Tea
- Botanical Slimming
- Fruit Plant Lossing Fat Capsule
- Sheng Yuan Fang
- Acai Berry Soft Gel ABC
- PhentraBurn Slimming Capsules
- Magic Slim Tea
- Magic Slim Weight Reduction Capsule
- P57 Hoodia
- Leisure 18 Slimming Coffee
- A-Slim 100% Natural Slimming Capsule
- Advanced Slim 5
- Ja Dera 100% Natural Weight Loss Supplement
- Slender Slim 11
For more information, see the FDA Tainted Weight Loss Products page, and click on a product name under “Public Notifications.”
There’s a phenomenon runners sometimes experience that’s commonly called “runners’ trots” – otherwise known as diarrhea – that has risk factors and that can possibly be avoided. Although the “trots” usually don’t last long and are generally nothing to worry about, they certainly can be a major annoyance, causing lost time in training or competition and even embarrassment if there is literally “nowhere to go.”
The most common risk factors cited are for those who are young, female, susceptible to irritable bowel syndrome, or lactose intolerant, as well as those who have had a previous abdominal surgery. The things we do to our bodies that reportedly increase risk are high-intensity exercise, dehydration, vertical-impact sports (e.g., running vs. biking), poor conditioning, medication, and diet. Although these are stated in the medical literature as risk factors, a recent study published in the International Sportmed Journal examined the evidence behind each of these risks to see if they hold up under scrutiny – and there’s surprisingly little evidence to support many of the statements about risk factors for developing “runners’ trots.” Most of the evidence was limited and relied on either single studies or multiple studies with varying results but a tendency toward supporting the conclusion.
Here are the conclusions of this evidence-based study:
The only strongly supported evidence was for dehydration to increase the risk of diarrhea. Female gender, younger age, high-intensity training, vertical impact, and medication had limited support and could go either way. Finally irritable bowel, lactose intolerance, previous abdominal surgery, poor conditioning, and dietary factors had very weak support. Keep in mind that little or no evidence does not make something true or false; it just means we have insufficient scientific evidence for any assumption.
So, based on the studies, how can you avoid “runners’ trots?”
- The evidence certainly supports staying well hydrated so that the bowel gets an adequate blood supply.
Even though the evidence for doing some things is not strong, they make sense and are not harmful. These include:
- Avoid a large meal 3-6 hours prior to running.
- Avoid food or drinks that have non-absorbable sweeteners (such as sorbital or sucralose), caffeine, and/or a high fat content.
- Don’t ingest concentrated carbohydrates (high glycemic index) before running.
- Be aware that energy bars and gels may contribute to the “trots” for some people.
- Avoid taking anti-diarrheal medications such as loperamide (e.g., Imodium) or Lomotil, since they can affect the ability of the body to tolerate heat.
- Wear loose-fitting clothing to reduce irritation.
- If symptoms persist for more than a few days, seek medical attention to be sure there is not an underlying cause.
Enjoy your run!
Warfighters have specific physical activity requirements, but their spouses, children, parents, and other loved ones also have physical fitness requirements for their own individual and family missions. HPRC's family section has a new area that summarizes recent guidelines for physical activity for U.S. adults, and children, and identifies military resources, interactive tools, and exercise workouts and videos. Check it out here!
The National Center for Telehealth and Technology has introduced a line of mobile apps focusing on mind-body strategies to help improve mood, PTSD symptoms, and induce relaxation. Currently, most of the applications are available at the iPhone app store and Android Market. Below is a list of a few that are currently available. For more details, visit the MT Stress Control Tools.
Besides keeping you healthy and fit, exercise has another important benefit. According to a news release from Oregon State University, a study conducted on more than 2,600 men and women between ages 18 to 85 found that individuals who exercise for 150 minutes a week at a moderate to vigorous level experience a 65% improvement in sleep quality. In addition, active people experienced less daytime sleepiness than those who are inactive. These findings appeared to be across the board—subjects experienced better sleep regardless of age, weight, and other health habits. For many, regular physical activity can be an effective, non-pharmaceutical alternative to improving sleep and concentration levels during waking hours.
The study, which was published in the December 2011 issue of Mental Health and Physical Activity, adds more evidence to the amazing body of research that demonstrates the importance of exercise for overall health.
Warfighters must be in excellent physical condition to endure a variety of physical tasks for extended periods. Healthy eating will greatly affect your physical performance. For good health and performance, eat the energy-providing nutrients (known as macronutrients)—carbohydrates, proteins, and fats. These foods supply fuel and are involved in many functions in your body. For detailed information on each of the macronutrients, see the Warfighter Nutrition Guide.