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.
HPRC Fitness Arena: Physical Fitness
Physical fitness is important at any age, and it’s especially important that children begin leading healthy, active lifestyles early on. Regular exercise for kids can build strong muscles and bones and promote overall health. Exercise can also boost kids’ self-esteem, improve sleep, and stimulate learning in school. But do you know what kinds of exercise your children or teens should be doing? Check out HPRC’s Answer, “Put some fun in your children’s fitness,” to find out.
If you’ve been experiencing pain, burning, numbness, or tingling in one or both of your hands, you might be experiencing symptoms of carpal tunnel syndrome. This “tunnel” in the wrist carries the important tendons and nerves that supply your hands with motor and sensory functions, allowing your hands to move and feel. Swelling inside the carpal tunnel can squeeze the median nerve that passes through it, causing discomfort. According to the Defense Medical Epidemiology Database, in the military, women are more likely than men to develop this condition. It’s also more likely to develop with age and rank. There are surgical and non-surgical treatments for carpal tunnel syndrome, but as the saying goes, “An ounce of prevention is worth a pound of cure.” The University of Maryland Medical Center has advice, which includes:
- Do exercises to keep your muscles and tendon flexible. (See the UMMC link above for detailed instructions.)
- When performing repetitive activities your the wrists and hands, take frequent breaks, even if it’s just for a minute or two at a time—called “microbreaks.”
- Use correct posture and technique, especially wrist position when using a keyboard or hand tools.
- Make sure that your work area is ergonomically sound. Military-specific information is available from both the Army Public Health Command and the Naval Safety Center.
HPRC’s Physical Fitness domain also has a section on Injury Prevention.
If you start to notice hip or knee pain during your PT runs, you might be experiencing iliotibial band friction syndrome—ITBFS for short—a common overuse injury. The iliotibial band, or IT band, is a thick band of fibrous tissue that extends down the outside of your thigh to where it attaches to your tibia (your larger lower-leg bone). As with all injuries to muscles and tendons, prevention is key. In most cases, ITBFS is brought on by combinations of factors—such as increasing your training mileage too fast, running on banked surfaces or downhill, pre-existing IT band tightness, and weakness of the lateral hip muscles—so paying attention to all of these is important for prevention. Incorporate some of these methods into your daily routine to help prevent ITBFS:
- A hip-conditioning program, as recommended by the American Academy of Orthopaedic Surgeons, can help you prevent ITBFS.
- Self-myofascial release methods such as foam rolling can be helpful with this hard-to-stretch area of your leg.
- Don’t do too much too soon. Gradually increase your running mileage or workout intensity. Guidelines for healthy adults include: (1) Increase the duration of your exercise program 5-10 minutes every one or two weeks over the first four to six weeks; or (2) increase your weekly training volume by no more than 10% per week.
- Stretches for the IT band and other muscles of the thigh and lower leg should be held for 30 seconds and repeated three to five times daily.
If you already have ITBFS, you probably notice more pain in the lateral (outside) hip or knee when you run downhill or when lengthen your stride. If left untreated, it also can lead to pain when you walk up and down stairs or sit for long periods of time with your knees flexed. Of course, you should consult with your physician for proper diagnosis and treatment. On your own, however, care usually includes the RICE and ISE methods.
Allowing time for the iliotibial band to heal is important for full recovery, so consider an alternative training routine (take a break from running and cycling) or take time off altogether. As the inflammation subsides, it may help to add stretching and strengthening exercises.
A 2011 study of musculoskeletal injuries in an Infantry Brigade Combat Team deployed to Afghanistan found that low back pain due to stress and strain on the back (not actual spinal cord injuries) was the most common complaint. Common causes of back injury include overuse, poor physical conditioning, and incorrect body movements when lifting and moving objects. Fortunately you can decrease your chances of injuring the muscles and ligaments of your back. The key is prevention: Stretching is one way to help prevent lower back pain, but it’s essential to use correct posture and body mechanics when you pick up and move objects such as heavy ammo cans! Daily back exercises (from the Mayo Clinic) and stretches can help strengthen your core and improve your posture, and the University of Maryland offers more valuable tips for prevention. If you’re experiencing back pain, however, you need to see a qualified healthcare professional for an accurate diagnosis and exercise program.
Staying in the physical condition you need for demanding duties and missions means that you are at risk for specific types of injuries, and rotator cuff injuries are common among service members. The rotator cuff is actually a group of muscles key to shoulder movement, including the ability to perform overhead activities. For those who are preparing for the CFT, this includes performing the Ammo Lift.
Warning signs of a shoulder injury can include not only pain and abnormal sounds during shoulder movement but also a decrease in strength and mobility/motion. What can you do about it? First, check with your healthcare provider to make sure that your injury does not require medical treatment. Then:
- Rest your injured shoulder! It is important to allow adequate time for healing.
- Use the RICE and ISE methods.
- Strengthen the muscles that control shoulder movement.
- Make sure that you have adequate flexibility of the rotator cuff muscles.
Of course, it’s always better to prevent injuries in the first place. To help reduce your risk of rotator cuff injury, it’s important to develop the strength and flexibility of the related muscles. For specific information on rotator-cuff exercises and self-care, check out these suggestions from MedLine Plus (a service of the National Institutes of Health) and this conditioning program from the American Academy of Orthopaedic Surgeons.
The Human Performance Resource Center is here to serve Warfighters and their families, commanders, and healthcare providers. If you’ve visited before, you probably know that we focus on “total force fitness.” But do you really know what that means—or how HPRC got started? If you’re curious, check out this PDF that describes HPRC, what we do, and the vast amount of information we cover. In addition, you may have noticed that we use the term “human performance optimization” throughout our site; this article also explains what that means.
Stretching and strengthening the muscles of the foot and ankle can help you prevent (and recover) from ankle sprains. The Foot and Ankle Conditioning Program from the American Academy of Orthopaedic Surgeons focuses on recovering from injury, but it includes well-illustrated exercises that are good for preventive conditioning too. Here are some other exercises useful for strengthening the foot and ankle structure:
- From a seated position, “pretend” writing the alphabet with each foot, in both upper- and lower-case letters.
- Stand on one leg on a pillow for 10 seconds and then switch legs. Be sure to have something nearby to grab for balance if necessary.
- From a seated position, use a resistance band looped to a secure surface, and wrap the other end around your forefoot; then move your foot/ankle forward, backward, and side-to-side, flexing at the ankle.
An ankle sprain involves damage to ligaments—bands of tissue that help hold joints together—in the foot and ankle, usually from the force of landing wrong on your foot. In military populations, ankle sprains are very common, significantly affecting operational readiness. In fact, ankle sprains are more common in the military than in civilian populations and more likely among women than men. By strengthening the muscles in your legs and feet, you can give more support to your ankle in the event of a misstep or an encounter with uneven terrain. The transition from military boots, which offer more ankle support, to traditional athletic shoes may also leave you and your ankles feeling vulnerable to twists and sprains. Start including ankle-strengthening exercises into your daily workout routine to help keep your ankles strong and free from injury.
Figuring out knee pain can take some detective work, although injuries are a common cause. For example, sports-related injuries such as anterior cruciate ligament (ACL) tears and chondromalacia (also called “runner’s knee”) can cause pain and affect performance. You can help prevent such injuries by strengthening your lower leg muscles. Strengthening your hamstrings and quadriceps, which cross the knee joint, can give extra stability and support to your knees. Leg exercises such as squats, lunges, curls, and extensions will improve muscular strength and endurance in your hamstrings and quadriceps.
Weight management is also important in preventing some knee injuries. Excess body weight only adds stress to the knees during weight bearing activities, like walking, running or jumping.
Another key to prevention is listening to your body. If you feel that minor symptoms are getting worse, it might be a good time to temporarily modify your training until symptoms subside. For example, if running is part of your cardiovascular routine, consider trying a few weeks of alternate activities that are less stressful on the joints such as swimming or biking.
Walk into any fitness center on base or take note of a group of soldiers training, and you’ll probably notice at least a few people in form-fitting synthetic t-shirts. The sports apparel industry has exploded in popularity over the past decade, with numerous manufacturers now competing to develop, market, and sell the newest pieces of clothing (shirts, shorts, underwear, socks), all geared to keep athletes cool while competing or training in hot environments. Is there any science behind these claims? Does tight-fitting clothing made of “high-tech” materials actually help with heat regulation and enhance athletic performance?
You heat up when you exercise, and sweating is the primary method your body uses to stay cool. Sweat evaporating off your skin is the most important method your body has to cool itself during exercise. High-tech materials are supposed to enhance “wicking”—the delivery of sweat away from the skin surface toward the clothing, which allows for evaporation—and limit the absorption of sweat by the clothing itself. Cotton, by contrast, absorbs moisture, so it’s not considered a good choice for exercise.
To date, there’s no evidence that this high-tech clothing improves thermoregulation when worn during exercise in hot environments. Specifically, researchers found no differences in heart rate or body and skin temperatures when subjects performed repeated 20–30 minute bouts of running outfitted in shorts, sneakers, and either a form-fitting compression or traditional cotton t-shirt. Research has also found that wicking sportswear had no effect on cooling when worn under a bulletproof vest or on a cycling sprint when worn under full ice hockey protective equipment. As of now, the best advice for staying cool during exercise in the heat is to wear lightweight clothing, stay properly hydrated, and listen to your body for signs of potential heat illness. For more information on performing in hot environments, please visit the “Heat” section of HPRC’s Environment domain.
The physical demands of military life are challenging, and if you’re not prepared, they can lead to injuries. The injury prevention series we’ll be running over the next several weeks will provide you with information and strategies for preventing some of the most common injuries: those to the knee, ankle, rotator cuff, back, iliotibial band and wrist/hand. Prevention is key: Taking time for the small stuff may have big payoff down the road. Much of what the exercises done for recovery after an injury can actually be done to prevent the injury in the first place. Stay injury-free for optimal performance! Check back soon for the first in this series.