Effects of Adaptation to a Low Carbohydrate/High Fat Diet and Pre-Exercise Feeding on Exercise Endurance, Metabolism, and Cardiovascular Dynamics in Swine.

摘要

Field combat personnel may be required to sustain moderate intensity work loads for extended periods, while having to eat-on-the-run. The use of a low carbohydrate (7% of calories)/high fat (74% of calories) diet (LCD) has been suggested as a means of improving endurance during moderate intensity exercise. Little is known about the interactions between preexercise eating and its effects on mechanisms of cardiovascular and metabolic control. A series of experiments were performed to establish a basis for manipulation of the metabolic system to improve exercise performance. Preexercise feeding resulted in reduced skeletal and cardiac muscle blood flows at identical exercise intensities in spite of an increased cardiac output needed for the digestive process. The finding of reduced myocardial blood flow, accompanying the increased blood flow demands for the digestive process during exercise has implications related to the occurrence of postprandial angina in man. The interactions between adaptation to a LCD and preexercise eating have potential application to enhancing performance of combat personnel. The interrelationships among these and other variables are briefly discusses. (KT)