Filed under: Gear
There are “steps” you can take to protect your feet from blisters. Common among athletes and service members, they might seem like a minor nuisance. However, if left untreated, they can lead to serious infections, sepsis (blood infection), and knee, ankle, or hip injuries.
Blisters result from a combination of friction and moisture. They’ve been blamed on shoe fit or lacing style, but scientific research has shown this isn’t necessarily the case. Common remedies—such as applying antiperspirant or drying powders to the bottom of the foot—aren’t very effective. And in some instances, they can cause irritation, increasing your chances of developing more blisters.
So if friction and moisture are causing problems, then wearing proper socks can bring relief. Look for ones made from acrylic fibers or materials other than cotton, which tends to stay wet. Synthetic materials (nylon, neoprene, and polyester) reduce the amount of shoe-to-sock and sock-to-foot friction by wicking moisture away from your skin. Padded socks also help because they allow for movement within the yarn, reducing frictional forces.
Some evidence suggests wearing a synthetic nylon or polyester liner with an outer-padded wool sock can help prevent blisters. Tip: Try finding your ideal sock before buying boots or shoes because the added bulk might affect the shoe size you need.
You also can reduce your risk of blisters by planning ahead, especially on extremely hot or rainy days. Avoid puddles. Remember to bring an extra pair of socks too. And avoid pouring water on your head since it can drip down into your shoes. Keep your feet happy and blister-free.
The Army has been working to make sure that the small first-aid kits that soldiers carry are equipped with the proper equipment they might need in an emergency. Here’s the lowdown on the additions to the IFAK II.
The new design is compatible with the Improved Outer Tactical Vest, where it can be mounted on the back, out of the way but still easy to reach. The creators of the IFAK II made individual tabs that “feel” different for each of the kit’s contents—so that when a soldier is trying to reach for something quickly, he/she can easily distinguish between products without actually looking at each pouch. This design is critical for rapid access to first-aid materials.
Other upgrades to the kit include the addition of a second tourniquet, a strap cutter, and a rubber-seal device to treat a sucking chest wound (when a bullet penetrates the lung and interferes with proper air flow). The addition of an eye patch to the kit also can help reduce damage to injured eyes.
Some soldiers in Afghanistan are already carrying the kits to test their functionality and provide feedback that can help lead to even more improvements.
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.
Pentagon scientists are hoping to build special gear designed to turn divers into veritable Aquamen (and Aquawomen). Although it’s still in the research phase, the new system would protect divers from the adverse effects of diving too deep or surfacing too fast. Sensors would read and adjust to a diver’s physical signs as well as help control levels of nitric oxide to prevent the decompression sickness known as “the bends.” When a diver ascends too quickly, bubbles form inside the body, which can block the blood vessels in the spinal cord and disrupt the nervous system. It can be very painful and can lead to joint pain, paralysis, and even sudden death if a diver is not careful.
The new diving gear will be a portable and versatile system that can potentially serve for use in other special operations as well as for civilian divers. This system will have to be designed for the most extreme combat dive profiles, which sometimes require a 35,000-meter free-fall from an aircraft, diving 200 feet below the surface for at least two hours, surfacing, and immediately diving again, followed by continued protection after being picked up in an unpressurized aircraft. This is one of DARPA’s most recent Small Business Innovation research proposals for 2013.