The average person’s total amount of muscle glycogen is approximately 300 – 500g depending on their gender, size, and level of training. The liver stores between 60 and 120g. A linear relationship exists between the depletion of muscle glycogen and fatigue during exercise. With less glycogen to produce glucose, hypoglycemia begins to affect the athlete. Typically, a person with a blood glucose level below 70 will start to feel light headed, lethargy, and have cold clammy skin. A highly trained athlete, on the other hand, can train at much lower levels than 70 for long periods of time.

As with all training topics there is conflicting evidence on what is the best method to achieve super-compensation of glycogen stores. studies are reporting similar results to the classic method, which so many athletes swear by, without carb depletion, while tapering their training (1,2,3). One thing is for sure, carbohydrate levels play a key role in training and competition success.

In order to figure out what works best for you, try different methods and keep a detailed journal. We all process carbs the same way, but we metabolize them at different rates. Keep mind, studies on training are by no means the end all be all. There are too many variables in most training studies to be reliable. Athletes, especially endurance athletes are over-trained. It is my opinion that athletes who are achieving super-compensation without depletion coupled with bouts of intense training, are doing so because they are over-trained and under-fed before starting the process.

The body is constantly working to stay in homeostasis. Physiology shows us glycogen storage is finite; the body needs a reason to super-compensate. Achieving a glycogen depleted state over a period of time produces an insulin sensitive environment, which is essential for more than normal levels of glycogen storage.

1. Eur J Appl Physiol 2002;87:290-295
2. Am J Physiol Endocrinol Metab 2003;285:E1304-E1311
3. Int J Sports Med 1981;2:114-118

Don’t be so concerned with how many training sessions you can handle per week. Be more concerned about the optimal amount. More is not always better. In fact, when somebody comes to me for advice because they’ve stopped making progress, usually I either reduce the workout volume or add days off. There is no reason in going to the gym if you’re not going to make progress. In every workout, if you have fully recovered, and you come ready to work, you should make progress, which is gauged by your strength.

How can anyone get stronger every workout? One can only bench press so much. Eventually, you have to hit a plateau. This is true. If one stays with the same exercises, the same number of reps and the same number of sets, progress may eventually stop. If the proper changes aren’t made at the right time, eventually the body adapts to the stimulus. And this is where the “art” of program design comes to play.

It’s easy to follow a workout. The real challenge is assuring the stimulus is sufficient and more importantly, you recovery from workout to workout so that progress continues over a long period of time. Sometimes this entails having the discipline to deviate from something that is not working. If you’re not making progrss, and you’re training with all out intensity, try taking an extra day off.

The product is intriguing, because according to the Men’s Journal correspondent, the tent works:

After three weeks, I felt as if I had a third lung. I blazed through a three-mile time trial 5 percent faster than I ever had, and I finished top-15 in my category in a hill climb. During the race I quickly caught my breath on the flat spots, then felt ready to pound away again. The tent worked — but I still had to train hard.

Two questions:

1) Is it worth $1,000-plus and sleeping in a bubble nightly to improve endurance?

For millionaire athletes, a thousand dollars for one of these puppies seems like a bargain, but what about for the common triathlon athlete or endurance enthusiast? Before dismissing the theory, how much do you spend yearly on food, supplements and training equipment to enhance your physique?

2) Are athletes like Armstrong cheating?

We as a society hate the fact that Barry Bonds could break a home run record he unfairly achieved, but are we being hypocritical? If these tents do work, did Armstrong have an unfair advantage? Steroids help testosterone growth, which therefore aids strength and muscle development through exercise. These tents are designed to increase red blood cell production, which therefore aids in endurance through exercise. The connection between these simulators and steroids might be on a different level, but it does raise an interesting debate.