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

被引:27
作者
Takarada, Y
Hirano, Y
Ishige, Y
Ishii, N
机构
[1] UNIV TOKYO,GRAD SCH ARTS & SCI,DEPT LIFE SCI,COLL ARTS & SCI,TOKYO 153,JAPAN
[2] UNIV TOKYO,FAC EDUC,TOKYO 153,JAPAN
关键词
cross-bridge mechanism; prestretch; eccentric contraction; squatting exercise; knee extensor muscles;
D O I
10.1152/jappl.1997.83.5.1749
中图分类号
Q4 [生理学];
学科分类号
071003 ;
摘要
The relation between the eccentric force developed during a countermovement and the mechanical power output was studied in squatting exercises under nominally isotonic load (50% of 1-repetition maximum). The subjects (n = 5) performed squatting exercises with a countermovement at varied deceleration rates before lifting the load. 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 similar to 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.
引用
收藏
页码:1749 / 1755
页数:7
相关论文
共 27 条
[1]   POSITIVE WORK AS A FUNCTION OF ECCENTRIC LOAD IN MAXIMAL LEG EXTENSION MOVEMENTS [J].
AVIS, FJ ;
TOUSSAINT, HM ;
HUIJING, PA ;
VANINGENSCHENAU, GJ .
EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY AND OCCUPATIONAL PHYSIOLOGY, 1986, 55 (05) :562-568
[2]  
BIGLANDRITCHIE B, 1981, EXERCISE SPORT SCI R, V9, P76
[3]   PRE-STRETCH POTENTIATION OF HUMAN SKELETAL-MUSCLE DURING BALLISTIC MOVEMENT [J].
BOSCO, C ;
KOMI, PV ;
ITO, A .
ACTA PHYSIOLOGICA SCANDINAVICA, 1981, 111 (02) :135-140
[4]   POTENTIATION OF THE MECHANICAL-BEHAVIOR OF THE HUMAN SKELETAL-MUSCLE THROUGH PRESTRETCHING [J].
BOSCO, C ;
KOMI, PV .
ACTA PHYSIOLOGICA SCANDINAVICA, 1979, 106 (04) :467-472
[5]   POSITIVE WORK DONE BY A PREVIOUSLY STRETCHED MUSCLE [J].
CAVAGNA, GA ;
DUSMAN, B ;
MARGARIA, R .
JOURNAL OF APPLIED PHYSIOLOGY, 1968, 24 (01) :21-+
[6]   EFFECTS OF ECCENTRIC AND CONCENTRIC MUSCLE ACTIONS IN RESISTANCE TRAINING [J].
COLLIANDER, EB ;
TESCH, PA .
ACTA PHYSIOLOGICA SCANDINAVICA, 1990, 140 (01) :31-39
[7]   PROPERTIES OF BODY SEGMENTS BASED ON SIZE AND WEIGHT [J].
DEMPSTER, WT ;
GAUGHRAN, GR .
AMERICAN JOURNAL OF ANATOMY, 1967, 120 (01) :33-&
[8]   NEURONAL MECHANISMS OF HUMAN LOCOMOTION [J].
DIETZ, V ;
SCHMIDTBLEICHER, D ;
NOTH, J .
JOURNAL OF NEUROPHYSIOLOGY, 1979, 42 (05) :1212-1222
[9]  
DUDLEY GA, 1991, AVIAT SPACE ENVIR MD, V62, P543
[10]   ENHANCEMENT OF MECHANICAL PERFORMANCE BY STRETCH DURING TETANIC CONTRACTIONS OF VERTEBRATE SKELETAL-MUSCLE FIBERS [J].
EDMAN, KAP ;
ELZINGA, G ;
NOBLE, MIM .
JOURNAL OF PHYSIOLOGY-LONDON, 1978, 281 (AUG) :139-&