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.
Sweat is a critical function when you’re performing in hot environments. As your body absorbs heat from the environment, your nervous system activates sweat glands to release sweat. The moisture on your skin then evaporates, taking heat away from your body and cooling you off.
Protective clothing impedes the evaporation of sweat and the heat exchange between you and the environment, a condition known as “evaporative resistance.” This means that the exposed parts of your body will cool off more quickly than the parts that are covered, but they are also more prone to insect bites. Reports from Marines and National Park employees feeling “excessive heat” and a loss of sweating sensations after applying moderate to high amounts of DEET to their skin brought the safety of this insect repellent into question.
In a recent study, researchers found that when 33% DEET lotion is applied according to military protocol, it does not interfere with sweat production or other physiological responses. Nor does it interfere with the evaporation process necessary for cooling to take place. Researchers concluded that 33% DEET can be worn safely during military and occupational activities performed in hot, insect-infested environments. Similar studies have found oil- or alcohol-based repellents may increase core temperature by reducing sweat evaporation rate but do not affect sweat production. The military-approved form of DEET is polymer-based.
You can watch a YouTube video about the science behind the study.
DEET is considered by the EPA to be a toxic pesticide. It should be used with caution and as directed. More information about DEET, its uses, and warnings can be found on the EPA fact sheet. As of 2004, DEET was considered safe for use on children older than two months of age. Specific information on its use and effect on children can be found in the EPA TEACH chemical summary.
Most of us will experience pain at some point in our lives, and Warfighters—in training or in theater—are obviously at an even greater risk. For that reason, pain management has become a priority for the military. Committed to being a comprehensive Warfighter resource, HPRC now has pain management information, tools, strategies, and resources. You’ll also find answers to some of the most common questions about pain, including:
- What is pain?
- Why do some people tolerate pain better than others?
- What is the difference between acute and chronic pain?
- What happens if pain becomes chronic?
- What sorts of things affect my pain?
- How do the DoD and VHA treat pain?
Being overweight puts you at risk for a whole host of health issues, but most people don’t think about the risk posed to their knees. The anterior cruciate ligament, or ACL, is one of the major ligaments of the knee and one of the most susceptible to injury. Injury information on more than 1,600 men and women at the U.S. Naval Academy showed that those with a higher body mass index (BMI) had a greater incidence of ACL tears. A difference in BMI of only 1.2 (25.6 versus 24.4) made the difference between having and not having this kind of injury. (To learn more about BMI, read HPRC's explanation.)
Like the adage “You don’t know what you’ve got until it’s gone,” knees are something we generally take for granted. To stay on top of your game, you need your knees. An easy way to protect them is to drop the extra weight you’re asking them to carry around.
Synthetic drugs are laboratory-made substances marketed and sold as alternatives to illegal drugs such as marijuana, cocaine, and amphetamines. Although most are advertised as “all-natural,” they may have serious health effects and violate the Uniform Code of Military Justice (UCMJ). HPRC takes a look at two examples of synthetic drugs, their legal status, and how they can affect service members in “HPRC’s Answer: Synthetic Drugs of Abuse.”
The annual Army “Strong B.A.N.D.S.” campaign is set to launch for another year beginning in May. Strong B.A.N.D.S. promotes physical fitness, nutrition, optimal health, and resilience by focusing on Balance, Activity, Nutrition, Determination, and Strength—forming the acronym B.A.N.D.S. The campaign has activities at numerous garrisons to help educate soldiers, their families, and civilians. Strong B.A.N.D.S. is a campaign of the U.S. Army Installation Management Command Family and Morale, Welfare and Recreation directorate and is “designed to energize and inspire community members to live a healthy lifestyle.”
Check out the website for detailed information and to see if there is a Strong B.A.N.D.S. activity near you.
Carnitine is a naturally occurring substance in the human body that helps cells use fat for energy. The liver and kidneys can produce carnitine from amino acids provided by the diet, but carnitine also comes from many foods, especially red meat, and is an ingredient in many dietary supplements and energy drinks.
Sometimes doctors use carnitine to treat certain heart conditions. Recent clinical trials suggest that carnitine supplements may help reduce many of the complications associated with heart attacks, such as chest pain and irregular heart rhythms.
But new research suggests that long-term consumption of dietary carnitine also may play a role in the development of atherosclerosis—“hardening of the arteries”—especially in people who eat red meat regularly. So what’s the bottom line? More research is needed to determine the risks and benefits associated with carnitine.
You can learn more about carnitine in HPRC’s Dietary Supplement Classification System.
Everyone has feelings—and by the time people become adults, most have a vocabulary for talking about them. Children, however, often don’t yet have this skill and are more likely to act out how they feel. A great way to strengthen your family is to help your child(ren) learn how to talk about feelings in an age-appropriate way. The Families Overcoming Under Stress (FOCUS) program for enhancing family resilience has created a “Feeling Thermometer” that you can use with your child so he or she can show you where his/her feelings fall. This is a great way to understand what your child is feeling and to start talking about emotions such as anger when a child gets too “hot,” so he or she can learn how to control such feelings and make that anger temperature go down.
For more ideas to strengthen your family, check out HPRC’s Family & Relationships domain.
Social media is great for staying connected with your friends and family, but you can also use it to your performance advantage by keeping up with information from reputable sources. HPRC’s social media and four others are reliable sources for great health and total fitness information for Warfighters, military families, and civilians. They also allow you to voice your opinion, ask a question, and interact directly with organizations. But remember: Just because it’s on the Internet doesn’t make it true. To get answers that are evidence-based, start here:
Posts evidence-based information on all components of human performance optimization
Operation Supplement Safety [Facebook]
Posts and answers questions on dietary supplements and how to use them wisely
Provides educational and inspirational messages around psychological health and resilience
Provides comprehensive military health and wellness information
Shares articles, blogs, and photos about military family life and wellness
Visit the MHS Social Media Directory for more great organizations you can follow.
DMAA, which the Food and Drug Administration (FDA) announced illegal in dietary supplements on 11 April 2013, has been used in many weight-loss, bodybuilding, and performance-enhancement products. HPRC has received many questions about it use by military personnel. To help answer questions about DMAA in general, we put together an Operation Supplement Safety (OPSS) FAQ. OPSS also has FAQs about Jack3d and OxyElite Pro, two popular dietary supplement products. Be sure to check back often as we add answers to other questions about ingredients in performance-enhancing and weight-loss supplements and how to choose supplements safely.
Both service members and civilians with at least seven Army 10-miler finishes under their belt are eligible for one of the 10,000 bibs available via early registration starting May 1st just after midnight for the 29th annual Army 10-Miler on Sunday, October 20, 2013. Service members must register with their .mil email addresses. Regular registration opens on May 15. Visit the Army 10-miler website for more information.