Trade-Off Between Maximal Power Output and Fatigue Resistance of the Knee Extensors for Older Men

Ryota Akagi, Yuta Nomura, Chiho Kawashima, Mari Ito, Kosuke Oba, Yuma Tsuchiya, Geoffrey A. Power, Kosuke Hirata

Research output: Contribution to journalArticlepeer-review

Abstract

This study investigated associations of fatigue resistance determined by an exercise-induced decrease in neuromuscular power with prefatigue neuromuscular strength and power of the knee extensors in 31 older men (65-88 years). A fatigue task consisted of 50 consecutive maximal effort isotonic knee extensions (resistance: 20% of prefatigue isometric maximal voluntary contraction torque) over a 70° range of motion. The average of the peak power values calculated from the 46th to 50th contractions during the fatigue task was normalized to the prefatigue peak power value, which was defined as neuromuscular fatigue resistance. Neuromuscular fatigue resistance was negatively associated with prefatigue maximal power output (r = -.530) but not with prefatigue maximal voluntary contraction torque (r = -.252). This result highlights a trade-off between prefatigue maximal power output and neuromuscular fatigue resistance, implying that an improvement in maximal power output might have a negative impact on neuromuscular fatigue resistance.

Original languageEnglish
Pages (from-to)1003-1013
Number of pages11
JournalJournal of aging and physical activity
Volume30
Issue number6
DOIs
Publication statusPublished - 2022 Dec 1

Keywords

  • interpolated twitch technique
  • isometric contraction
  • isotonic contraction
  • muscle shear modulus

ASJC Scopus subject areas

  • Physical Therapy, Sports Therapy and Rehabilitation
  • Rehabilitation
  • Gerontology
  • Geriatrics and Gerontology

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