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Influence of a 3.5 day fast on physical performance.

Publication ,  Journal Article
Knapik, JJ; Jones, BH; Meredith, C; Evans, WJ
Published in: Eur J Appl Physiol Occup Physiol
1987

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 x s-1 and 3.14 rad x 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 x s-1. Aerobic endurance was measured as time to volitional fatigue during a cycle ergometer exercise at 45% VO2max. Measures of VO2, 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 (approximately 10%) at both velocities. VO2, 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.

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Published In

Eur J Appl Physiol Occup Physiol

DOI

ISSN

0301-5548

Publication Date

1987

Volume

56

Issue

4

Start / End Page

428 / 432

Location

Germany

Related Subject Headings

  • Sport Sciences
  • Physical Exertion
  • Physical Endurance
  • Oxygen Consumption
  • Male
  • Isometric Contraction
  • Humans
  • Heart Rate
  • Food
  • Fasting
 

Citation

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Knapik, J. J., Jones, B. H., Meredith, C., & Evans, W. J. (1987). Influence of a 3.5 day fast on physical performance. Eur J Appl Physiol Occup Physiol, 56(4), 428–432. https://doi.org/10.1007/BF00417770
Knapik, J. J., B. H. Jones, C. Meredith, and W. J. Evans. “Influence of a 3.5 day fast on physical performance.Eur J Appl Physiol Occup Physiol 56, no. 4 (1987): 428–32. https://doi.org/10.1007/BF00417770.
Knapik JJ, Jones BH, Meredith C, Evans WJ. Influence of a 3.5 day fast on physical performance. Eur J Appl Physiol Occup Physiol. 1987;56(4):428–32.
Knapik, J. J., et al. “Influence of a 3.5 day fast on physical performance.Eur J Appl Physiol Occup Physiol, vol. 56, no. 4, 1987, pp. 428–32. Pubmed, doi:10.1007/BF00417770.
Knapik JJ, Jones BH, Meredith C, Evans WJ. Influence of a 3.5 day fast on physical performance. Eur J Appl Physiol Occup Physiol. 1987;56(4):428–432.

Published In

Eur J Appl Physiol Occup Physiol

DOI

ISSN

0301-5548

Publication Date

1987

Volume

56

Issue

4

Start / End Page

428 / 432

Location

Germany

Related Subject Headings

  • Sport Sciences
  • Physical Exertion
  • Physical Endurance
  • Oxygen Consumption
  • Male
  • Isometric Contraction
  • Humans
  • Heart Rate
  • Food
  • Fasting