Sunday, September 28, 2008

Nutritional aspects to optimize climbing training and performance

One of the climbing performance key factors is the body weight. Climbing depends in it. We shouldn’t forget that move extra weight will add an extra load to the muscles that are involved in climbing, mainly in overhanging walls, where it’s more difficult to use your feet to support weight and this way help upper body.
Maintaining body weight in optimal values and reducing weight to minimum is a must for performance.
In the graphic you will see the different body sizes of an elite climber in relation to the population media (Phantom strategy). Skin folds are between 2 and 3 standard deviations, which means a very lean body.
Legs perimeters are below the media, but upper body perimeters (forearms and arms) are above.Body weight is a sum of 5 different tissues: muscle, adipose, bone, organs and body liquids.
One of the ways to measure those components is doing an anthropometry, which determines the percentages of each component and with that information one can decide if it is necessary to modify body composition to optimize performance.
The next graphics shows the different component percentages of an elite climber and it comparison with the media (Phantom)

Note again, that the adipose mass is between 2 and 3 SD below the media, and the muscular mass above.

Muscular and adipose mass are the values that can be modified by training and nutrition. Upper body muscular mass (muscles) is one of the fundamental components of climbing performance, and for that reason is a must to maintain it or sometimes increase its volume. Sometimes is recommended to reduce lower body muscular mass by a specific training (low intensity aerobic exercise)
But body fat is useless in climbing, and is a must to reduce it to the lowest possible values.

It’s interesting to note that some levels of body fat are necessary to maintain body normal functions, so some minimum levels are required: 15% for men and 20 % for women predicted by Kerr 1988 anthropometric formula.

Nutrition is one of the factors for reduce or maintain body weight, determined by the caloric intake.
To reduce body weight it is necessary to acquire a negative energetic balance, which means that the energetic intake must be lower than the energy consumption.
There are two ways to do this: reducing caloric intake or increase energy consumption (by training).
Some recommendations to reduce weight:
- Moderate caloric restriction (-500 to 1000 Kcal/day)
- Low fat diet (20-35% of the total caloric intake)
- Moderate protein diet (15 to 25%)
- Carbohydrates 55-60% of the total caloric intake, using simple carbs are preferably
- Include foods rich in fibers like fruits and vegetables

Excessive food intake restriction might be dangerous for performance. It is necessary to maintain energy levels to support training loads, and recover from them.
Nutritional strategies to reduce body weight will be a guide for all day diet, but it is very important to start training with full energy stores, and during the recovery period assure the essential components to accelerate and complete it.
It’s necessary to adopt specific nutritional strategies for each climbing training session.

Previous to each climbing training session you must eat enough carbohydrates to maintain the activity throughout the whole period of time. If it lasts more than one hour it will be necessary also to ingest carbohydrates during the same training session.
In turn to recover it is important to consume them after training, before two hours of having concluded. Carbohydrate sport drinks are a good option if you don't tolerate foods in the stomach during training or immediately after finish.
Consider that not only the quantity or type of nutritious is important, but also the time where they should be eaten, if you eat them during the two previous and/or later hours to the workout, the benefits are amplified.
If the goal of the training session is the strength improvement, you’ve to supplement the carbohydrates intake with proteins, especially branched chain amino acids (BCAA) to avoid the muscular catabolism (muscular fibers rupture), characteristic of this type of trainings.
The BCAA constitute near 33% of the total of amino acids that form the muscular proteins, and they are fundamental to stimulate and regulate the protein synthesis processes
There is enough scientific evidences that indicates that the BCAA supplementation is effective to improve recovery speed and to stimulate the protein synthesis. On the other hand, they have also benefits to attenuate the mental fatigue provoked by a serotonin excess (cerebral neurotransmitter that regulates the neural activity) that could induce to apathy and performance reduction.

Prof. Juan Martín Miranda