Influence of a 3.5 Day Fast on Physical Performance Running Heading: Fasting and Performance,
Abstract
The influence of a 14 h fast or a 3.5 day fast on physical performance was investigated in 8 young men. In both conditions they were tested for isometric strength, isokinetic strength (elbow flexors, 30 degs/sec and 180 degs/sec), anaerobic capacity and aerobic endurance. Anaerobic capacity was evaluated by having subjects perform 50 rapidly repeated isokinetic contractions of the elbow flexors at 180 degs/sec. Aerobic endurance was measured as time to volitional fatigue during a cycle ergometer exercise at 45% VO2 max. Measures of VO2, V sub E, heart rate, and ratings of perceived exertion were obtained prior to and during the cycle exercise. The 3.5 day fast did not influence isometric strength, anaerobic capacity or aerobic endurance, but isokinetic strength was significantly reduced (approx. 10%) at both velocities. VO2, V sub E and perceived exertion were not affected by fasting. Fasting significantly increased heart rate during exercise but not at rest. It was concluded that there are minimal impairments in physical performance as a result of a 3.5 day fast provided there is little physical activity during the fasting period. Keywords: Starvation, Muscle strength, Oxygen uptake, and Ventilation.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1986
- Accession Number
- ADA169597
Entities
People
- Bruce Jones
- Carol Meredith
- Jospeh Knapik
- William J. Evans
Organizations
- United States Army Research Institute of Environmental Medicine