Effects of age on human muscle torque, velocity, and power in two muscle groups

I. R. Lanza, T. F. Towse, G. E. Caldwell, D. M. Wigmore, J. A. Kent-Braun

Research output: Contribution to journalArticle

128 Scopus citations

Abstract

The purpose of this study was to test the hypotheses that, under isovelocity conditions, older compared with young humans would 1) be slower to reach target velocity and 2) exhibit a downward shift in the torque-velocity and power-velocity relationships in the ankle dorsiflexor and knee extensor muscles. We studied 12 young (26 ± 5 yr, 6 men/6 women) and 12 older (72 ± 6 yr, 6 men/6 women) healthy adults during maximal voluntary concentric contractions at preset target velocities (dorsiflexion: 0-240°/ s; knee extension: 0-400°/s) using an isokinetic dynamometer. The time to target velocity was longer in older subjects in the dorsiflexors and knee extensors (both P ≤ 0.02). Averaged across all velocities, older subjects produced ∼26% less concentric torque and power in the dorsiflexors (P < 0.01) and ∼32% less in the knee extensors (P < 0.01). The downward shift in the torque-velocity relationship persisted even when torque was expressed relative to each subject's maximum. In the knee extensors only, the age-related decrement in power increased with increasing velocities, suggesting that this muscle group may be more susceptible to age-related losses of function than the dorsiflexor muscles are. In support of our hypotheses, these results demonstrate an age-related impairment in the dynamic performance of two functionally distinct muscle groups in healthy older adults. With age, the impairment of dynamic performance appears to exceed the loss of isometric performance, particularly in the knee extensor muscles.

Original languageEnglish (US)
Pages (from-to)2361-2369
Number of pages9
JournalJournal of applied physiology
Volume95
Issue number6
DOIs
StatePublished - Dec 2003

Keywords

  • Ankle dorsiflexors
  • Dynamic
  • Isometric
  • Knee extensors
  • Sarcopenia

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)

Fingerprint Dive into the research topics of 'Effects of age on human muscle torque, velocity, and power in two muscle groups'. Together they form a unique fingerprint.

  • Cite this