HUMAN SKELETAL-MUSCLE FIBER TYPES AND FORCE - VELOCITY PROPERTIES

被引：39

作者：

MACINTOSH, BR ^{[1
]}

HERZOG, W ^{[1
]}

SUTER, E ^{[1
]}

WILEY, JP ^{[1
]}

SOKOLOSKY, J ^{[1
]}

机构：

[1] UNIV CALGARY,FAC PHYS EDUC,CTR SPORT MED,CALGARY T2N 1N4,AB,CANADA

来源：

EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY AND OCCUPATIONAL PHYSIOLOGY | 1993年 / 67卷 / 06期

关键词：

TORQUE; ANGULAR VELOCITY; ISOKINETIC; MUSCLE CONTRACTION; POWER;

D O I：

10.1007/BF00241645

中图分类号：

Q4 [生理学];

学科分类号：

071003 ;

摘要：

It has been reported that there is a relationship between power output and fibre type distribution in mixed muscle. The strength of this relationship is greater in the range of 3-8 rad.s(-1) during knee extension compared to slower or faster angular knee extensor speeds. A mathematical model of the force:velocity properties of muscle with various combinations of fast- and slow-twitch fibres may provide insight into why specific velocities may give better predictions of fibre type distribution. In this paper, a mathematical model of the force:velocity relationship for mixed muscle is presented. This model demonstrates that peak power and optimal velocity should be predictive of fibre distribution and that the greatest fibre type discrimination in human knee extensor muscles should occur with measurement of power output at an angular velocity just greater than 7 rad.s(-1). Measurements of torque:angular velocity relationships for knee extension on an isokinetic dynamometer and fibre type distribution in biopsies of vastus lateralis muscles were made on 31 subjects. Peak power and optimal velocity were determined in three ways: (1) direct measurement, (2) linear regression, and (3) fitting to the Hill equation. Estimation of peak power and optimal velocity using the Hill equation gave the best correlation with fibre type distribution (r>0.5 for peak power or optimal velocity and percentage of fast-twitch fibres). The results of this study confirm that prediction of fibre type distribution is facilitated by measurement of peak power at optimal velocity and that fitting of the data to the Hill equation is a suitable method for evaluation of these parameters.

引用

页码：499 / 506

页数：8

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