Stretch-induced enhancement of mechanical power output in human multijoint exercise with countermovement

Yudai Takarada, Yuichi Hirano, Yusuke Ishige, Naokata Ishii

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

The relation between the eccentric force developed during a countermovement and the mechanical power output was studied in squatting exercises under nominally isotonic lead (50% of 1-repetition maximum). The subjects (n = 5) performed squatting exercises with a countermovement at varied deceleration rates before lifting the lead. The ground reaction force and video images were recorded to obtain the power output of the body. Net muscle moments acting at hip, knee, and ankle joints were calculated from video recordings by using inverse dynamics. When an intense deceleration was taken at the end of downward movement, large eccentric force was developed, and the mechanical power subsequently produced during the lifting movement was consistently larger than that produced without the countermovement. Both maximal and mean power outputs during concentric actions increased initially with the eccentric force, whereas they began to decline when the eccentric force exceeded ~1.4 times the sum of load and body weight. Video-image analysis showed that this characteristic relation was predominantly determined by the torque around the knee joint. Electromyographic analyses showed no consistent increase in time-averaged integrated electromyograph from vastus lateralis with the power output, suggesting that the enhancement of power output is primarily caused by the prestretch-induced improvement of an intrinsic force-generating capability of the agonist muscle.

Original languageEnglish
Pages (from-to)1749-1755
Number of pages7
JournalJournal of Applied Physiology
Volume83
Issue number5
Publication statusPublished - 1997 Nov
Externally publishedYes

Fingerprint

Deceleration
Knee Joint
Muscles
Video Recording
Ankle Joint
Quadriceps Muscle
Hip Joint
Torque
Body Weight
Lead

Keywords

  • Cross-bridge mechanism
  • Eccentric contraction
  • Knee extensor muscles
  • Prestretch
  • Squatting exercise

ASJC Scopus subject areas

  • Physiology
  • Endocrinology
  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

Cite this

Stretch-induced enhancement of mechanical power output in human multijoint exercise with countermovement. / Takarada, Yudai; Hirano, Yuichi; Ishige, Yusuke; Ishii, Naokata.

In: Journal of Applied Physiology, Vol. 83, No. 5, 11.1997, p. 1749-1755.

Research output: Contribution to journalArticle

Takarada, Yudai ; Hirano, Yuichi ; Ishige, Yusuke ; Ishii, Naokata. / Stretch-induced enhancement of mechanical power output in human multijoint exercise with countermovement. In: Journal of Applied Physiology. 1997 ; Vol. 83, No. 5. pp. 1749-1755.
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