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Amenorrheic female athletes should certainly take calcium supplements, and other female athletes should consider taking calcium supplements, to ensure adequate calcium status and maintain healthy bones. Although vitamin and mineral supplementation may improve the nutritional status of athletes consuming marginal amounts of micronutrients from food and may improve performance in athletes with deficiencies, there is no convincing evidence to indicate that doses in excess of the RDA improve ...
Carbohydrate intake in the days before competition mainly replenishes muscle glyco-gen stores, whereas carbohydrate intake in the hours before competition optimizes liver glycogen stores. This study revealed that the subjects who received the high-protein, high-fat, low-carbohydrate diet first followed by the high-carbohydrate diet had higher rates of muscle glycogen resynthesis. But the moderate approach produced similar muscle glycogen levels (204 mmol/kg w.w.). Therefore, a normal ...
Convincing evidence from numerous studies indicates that carbohydrate feeding during exercise of about 45 minutes or longer (Jeukendrup 2004, 2008; Jeukendrup et al. A drop in carbohydrate oxidation occurred after about 1.5 hours of exercise with placebo, and high rates of carbohydrate oxidation were maintained with carbohydrate feeding. Several factors have been suggested to influence exogenous carbohydrate oxidation including feeding schedule, type and amount of carbohydrate ingested, and...
Fat is an extremely important fuel for endurance exercise, along with carbohydrate, and some fat intake is required for optimal health. Most of this fat is stored in subcutaneous adipose tissue, but some fat can also be found in muscle as intramuscular triacylglycerol (IMTG). Understanding the effects of various nutritional strategies requires an understanding of fat metabolism and the factors that regulate fat oxidation during exercise.
Body fat consists of essential body fat and storage fat. Essential body fat is approximately 3% of body mass for men and 12% of body mass for women. In sports such as body-building, increasing lean-body mass and increasing body weight without increasing body fat are desir-able.
These include Claude Bouchard, author of Physical Activity and Health, Costas Karageorghis and Peter Terry, joint authors of Inside Sport Psychology, Vicky Goosey-Tolfrey, author of Wheelchair Sport, Dan Gould, author of Foundations of Sport and Exercise Psychology, Sophia Jowett and David Lavallee, joint authors of Social Psychology in Sport, Mike Gleeson, author of Sport Nutrition and Greg Whyte, author of Practical ECG for Exercise Science and Sports Medicine. Thursday 19th JulyGertrude ...
Achieving body mass and body fat goals often requires considerable body mass reduction. Untrained individuals and beginning athletes can lose body fat (and sometimes body mass) while increasing LBM as a result of caloric restriction and training (Stone et al. However, it is unlikely that athletes already possessing a low body fat and low percent fat can lose substantial body mass and not lose some LBM as well, especially if caloric restriction is used to enhance body mass loss (Ballor et al...
