European Journal of Applied Physiology and Occupational Physiology

, Volume 56, Issue 4, pp 428–432

Influence of a 3.5 day fast on physical performance

Authors

  • Joseph J. Knapik
    • US Army Research Institute of Environmental Medicine
    • Massachusetts Institute of Technology
    • USDA Human Nutrition Research Center on AgingTufts University
  • Bruce H. Jones
    • US Army Research Institute of Environmental Medicine
    • Massachusetts Institute of Technology
    • USDA Human Nutrition Research Center on AgingTufts University
  • Carol Meredith
    • US Army Research Institute of Environmental Medicine
    • Massachusetts Institute of Technology
    • USDA Human Nutrition Research Center on AgingTufts University
  • William J. Evans
    • US Army Research Institute of Environmental Medicine
    • Massachusetts Institute of Technology
    • USDA Human Nutrition Research Center on AgingTufts University
Article

DOI: 10.1007/BF00417770

Cite this article as:
Knapik, J.J., Jones, B.H., Meredith, C. et al. Europ. J. Appl. Physiol. (1987) 56: 428. doi:10.1007/BF00417770

Summary

Eight young men were tested for strength, anaerobic capacity and aerobic endurance in a post absorptive state and after a 3.5 day fast. Strength was tested both isokinetically (elbow flexors, 0.52 rad·s−1 and 3.14 rad·s−1) and isometrically. Anaerobic capacity was evaluated by having subjects perform 50 rapidly repeated isokinetic contractions of the elbow flexors at 3.14 rad·s−1. Aerobic endurance was measured as time to volitional fatigue during a cycle ergometer exercise at 45% \(V_{O_{2{\text{max}}} }\). Measures of \(V_{{\text{O}}_{\text{2}} }\), VE, 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. Isokinetic strength was significantly reduced (∼ 10%) at both velocities. \(V_{{\text{O}}_{\text{2}} }\), VE 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 parameters measured here as a result of a 3.5 day fast.

Key words

FastingStarvationMuscle strengthAerobic enduranceAnaerobic capacity

Copyright information

© Springer-Verlag 1987