Filed under: Training
Can you train in the heat to improve your performance at altitude? The answer is “sort of.” “Cross acclimation” or “cross tolerance” is the idea that exposing yourself to one environmental condition can help you adapt to another one as long as they have certain things in common.
As it turns out, this is the case for heat and hypoxia (low oxygen). This is important because athletes and service members can be exposed to altitude without prior or sufficient acclimatization. Altitude sickness can cause several problems, especially decreased performance. But some evidence shows that this method of training in hot conditions to prepare for altitude can actually work.
If you climb to the top of a mountain, there’s less air and less pressure. And you’re getting less oxygen with each breath. This can be simulated at sea level (in special labs) where pressures are normal, but the amount of oxygen in the air is reduced (fake altitude).
However, there’s a bit of a catch. Training in the heat under artificial low-oxygen conditions—normobaric hypoxia or “fake altitude”—involves normal pressure, which is different from “real altitude” or hypobaric hypoxia, which involves reduced oxygen at low pressure. The difference is in the pressure.
So, do these two environments cause the same types of physiological changes? There are several other factors involved in real-altitude acclimatization that might not be accounted for at fake altitude, so the jury’s still out.
Training in the heat might prepare you for performance at altitude—to a point. Ideally, if you’re going to be at altitude, try to acclimatize yourself as much as you can.
The truth is that the jury’s still out on whether running on a softer surface has less impact on joints and muscles. Some research suggests it might not actually matter, and the forces that impact your lower body on various surfaces such as asphalt, concrete, and grass don’t increase knee pain or injury risk. One explanation is that your body automatically adapts to the surface you’re running on. That means you’ll instinctively strike harder on softer surfaces, and strike softer on harder surfaces. On the other hand, some evidence suggests that running on softer surfaces (such as grass) reduces stress on your muscles and joints.
“But it feels better when I run on soft surfaces,” you might say. That difference in feeling is likely due to the different kinds of muscles, or stabilizers, you use when running on softer surfaces, which creates a sensation of less impact, although the overall impact on your body is the same.
That’s not to say that you shouldn’t run on soft surfaces if it makes you feel better. Feeling better on a run goes a long way. However, softer surfaces such as trails, grass, or sand tend to be more uneven, which can pose a greater risk of strains and sprains.
When it comes to injury prevention and recovery, it’s also important to consider other factors such as wearing the right running shoes. And be sure to increase your running intensity and volume gradually to help avoid injury too.
Preparation for your Physical Fitness (PFT) and Physical Readiness Tests (PRT) takes time and discipline. Training for the test isn’t something you should start the month before the test, and the habits you develop leading up to the test should be ones you continue even after the test. Weekend warriors and procrastinators are at greater risk for injury, and it’s likely that your performance will be less than optimal when it comes time for the test.
If you’re just getting back into shape, be sure to do it gradually. Once you’ve resumed a regular exercise routine, you might notice some aches and pains. Listen to your body. Watch out for symptoms of common athletic injuries such as overuse injuries and knee pain. It’s important to address these issues early to minimize any damage and get you back in action as soon as possible. Maintaining your exercise routine after the PFT/PRT and challenging yourself along the way will keep you in warrior-athlete shape year round and prevent deconditioning.
HPRC provides a series of articles with guidelines to help you prepare for the PFT/PRT, beginning with this one on aerobic conditioning. Read more...
How do you know how much weight to lift when you start a resistance-training program? Most programs are designed around lifting a percentage of your maximum strength.
First, you need to find out what your maximum strength is. A popular method is the one-repetition maximum test (1RM): the most weight you can press once but not twice. You can also do multiple-repetition tests for a reliable estimate of maximum strength. A 5-repetition test seems to be accurate, but more than 10 reps is unreliable.
This instructional video demonstrates the American College of Sports Medicine’s (ACSM) protocol for a 1RM test. ACSM’s protocol can also be applied to a multiple-repetition test. For example, determine the most weight you can lift 5 times, but not 6 times, for a 5-rep max test. If you have doubts about whether this is the right test for you, be sure to consult a healthcare professional.
The second step is to determine what amount of weight—as a percentage of your 1RM—you should use to improve your muscular strength and endurance. Typically, your muscular strength should improve if you use 60–80% of your 1RM. You should be able to improve your muscular endurance using about 50% of your 1RM. Once you’ve assessed your maximum strength, use this conversion chart from the National Academy of Sports Medicine (NASM) to determine your 1RM percentages.
An important thing to know about stress fractures is how to avoid them. A stress fracture is a tiny crack in a bone that happens when your muscles can’t absorb shock and transfer stresses to the bone. Most occur in the lower extremities, especially the lower leg and foot.
A stress fracture is usually an overuse injury that develops over a long period of time—from weeks to months. They’re especially common among military recruits, in about 3% of men and 9% of women. And since it can take several weeks to months for a stress fracture to heal, the best approach is to avoid getting one. Here are some tips for prevention:
- Use the progression principle of training: Gradually increase your training intensity, usually by no more than 10% weekly if you exercise 3 or more days a week. Slowly incorporate higher-stress activities such as jumping and interval training into your workout. Set incremental goals to help you develop your training routine step-by-step.
- Check your footwear and make sure it matches your training routine. Replace old or worn footwear.
- Check your form. Are you moving properly when you exercise or does your form put you at risk of injury?
- Pay attention to early signs of injury. Unusual muscle soreness and other aches and pains can be a sign of injury and/or imbalances that could worsen if they aren’t addressed early.
- Monitor your diet, specifically calcium and vitamin D intake. To learn more, read the National Institute of Health’s Dietary Supplement Fact Sheet on calcium and HPRC’s article on vitamin D.
It’s important to recognize a stress fracture and get medical help early, as described by the American Academy of Orthopaedic Surgeons. The Mayo Clinic provides more information on symptoms. And check out HPRC’s Injury Prevention section for more on how to avoid injury.
Since pull-ups are tough and require a lot of strength, HPRC just created a training program to help you meet the challenge. Achieving a pull-up might be easier for some, but more difficult for others, especially women. Other factors such as body fat, arm length, and height can affect your ability to achieve a pull-up too.
But what that means is—with the right training—you can do it! Check out HPRC’s Pull-up Progression Program for exercises aimed at increasing your strength and helping you achieve your first pull-up.
“Long slow-distance runs,” the coaching phrase goes, “make long slow-distance runners.” A leisurely long run isn’t bad for you—it just means that if you want to run faster, you have to train faster. Mix it up instead and incorporate speed workouts into your runs: interval, tempo, and fartlek.
Always include a warm-up and cooldown with your workout. Limit speed workouts to twice a week and get enough rest and recovery in between. Actively rest by going on a lighter run or bike ride, or even doing some yoga. Learn more about how speed workouts can ramp up your performance. Read more...
Personal trainers can help you safely start and maintain an exercise routine. They can keep you motivated and accountable when it comes to reaching your fitness goals. Finding the right trainer can be challenging but important. Think of it like a date: get to know your potential trainer to find out if you’re compatible. Here are a few things to look for:
- Education/Certifications. These days, anyone can become a personal trainer with a few mouse clicks. Is this person certified through one of the National Commission for Certifying Agencies (NCCA) such as National Federation of Personal Trainers (NFPT), American Council on Exercise (ACE), American College of Sports Medicine (ACSM), or National Academy of Sports Medicine (NASM)? These are widely accepted certifications. Better yet, does the trainer have a 4-year degree in kinesiology or exercise science? Is he/she certified in CPR and first aid?
- Experience. We all have to start somewhere, but experience is helpful. How long has this person been a certified personal trainer? What types of clients does the trainer usually work with? Does he/she have expertise in sports conditioning, pre-natal fitness, or post-rehabilitation? If possible, ask clients (past and/or present) about their personal experiences.
- Personality. You have to enjoy spending time with your trainer so that you’re fully committed to your training routine. Do you prefer a female or a male trainer? Someone close to your age? Choose somebody you like—someone who can motivate you.
- Business practices/Liability. Before you begin, make sure you understand all payment policies and procedures. Are your schedules compatible? What’s the cancellation policy? Does the trainer carry professional liability insurance?
- Fees. Personal trainers can be worth the money, but make sure you understand what you’re paying for. What are the costs? How long is each session? How often will you meet? Is it cheaper if you buy more sessions up front? Will you need to purchase a gym membership?
Training on the treadmill and “overground” running are not the same. If you’ve experienced treadmill running and find yourself more tired afterwards than you would on an outdoor run, you’re not alone. It seems athletes actually run slower on a treadmill than their normal pace outside, yet they perceive treadmill running as being more exhausting. In other words, even though it feels more difficult, treadmill running is usually less intense and less physically challenging than running outdoors.
If you’re training for an outdoor race, ideally you should run most of your training miles outside. However, running indoors can be helpful if you’re recovering from an injury since running on a treadmill is easier on your joints than running outside on concrete or even grass. When you want or need to run indoors on a treadmill, set the incline at 1–2% to increase your exertion level to more closely replicate your outdoor runs.
If you decide to run outside during a cold spell, take a look at our article with tips for staying safe in cold weather and the many resources on cold environments where you can find more ways to keep warm and hydrated even in frigid weather. Remember: Whether you stay in or venture out, any exercise is better than none!
Have you ever felt great after a hard workout, only to find yourself incredibly sore a day or two later? Muscle pain a day or so after exercise is common among recreational athletes. Known as delayed onset muscle soreness (DOMS), this condition can be treated at home—and possibly even prevented—with simple techniques. Strategies to prevent or reduce DOMS include stretching, protein/carbohydrate recovery drinks, and cold-water immersion. Over-the-counter medications can also help with pain but should be used infrequently and at the lowest effective dose. For more detailed information about DOMS and how to prevent and recover from it, read HPRC’s Answer, “Delayed Onset Muscle Soreness.”