Accession Number:

ADA201062

Title:

Factors in Maximal Power Production and in Exercise Endurance Relative to Maximal Power

Descriptive Note:

Rept. for Aug 1986-Oct 1988

Corporate Author:

ARMY RESEARCH INST OF ENVIRONMENTAL MEDICINE NATICK MA

Report Date:

1988-10-13

Pagination or Media Count:

28.0

Abstract:

The relationship of muscle fiber type and mass to maximal power production and the maintenance of power endurance time to exhaustion at 36, 55, and 73 of maximal power was investigated in 18 untrained but physically active male subjects. Power output was determined at constant velocity 60 RPM on a high intensity cycle ergometer instrumented with force transducers and interfaced with a computer. Fat free mass was determined by hydro-static weighing, fat free thigh volume by water displacement and skinfold measurement, and percentage and area of type II fibers from biopsies of the vastus lateralis. Maximal power averaged 771 or - 149 W with a range of 527-1125 W. No significant correlations were found among percentage of type II fibers, relative area of type II fibers, or fat free thigh volume and maximal power or endurance times to exhaustion at any percentage of maximal power. Weak but significant relationships were found for fat free mass with both maximal power r0.57 and endurance time at 73 of maximal power r0.47. These results show maximal power to be more dependent on factors related to body size than muscle fibers characteristics. Keywords Anaerobic exercise, Skeletal muscle fiber morphology, Fat free thigh volume, Cycle ergometry strength physiology, Physical fitness.

Subject Categories:

  • Anatomy and Physiology
  • Stress Physiology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE