Effects of isometric training on the elasticity of human tendon structures in vivo

被引:190
作者
Kubo, K
Kanehisa, H
Ito, M
Fukunaga, T
机构
[1] Univ Tokyo, Dept Life Sci Sports Sci, Meguro Ku, Tokyo 1538902, Japan
[2] Nippon Sport Sci Univ, Grad Sch Hlth & Sport Sci, Setagaya Ku, Tokyo, Japan
关键词
resistance training; stiffness; ultrasonography; vastus lateralis muscle;
D O I
10.1152/jappl.2001.91.1.26
中图分类号
Q4 [生理学];
学科分类号
071003 ;
摘要
The present study aimed to investigate the effect of isometric training on the elasticity of human tendon structures. Eight subjects completed 12 wk (4 days/wk) of isometric training that consisted of unilateral knee extension at 70% of maximal voluntary contraction (MVC) for 20 s per set (4 sets/day). Before and after training, the elongation of the tendon structures in the vastus lateralis muscle was directly measured using ultrasonography while the subjects performed ramp isometric knee extension up to MVC. The relationship between the estimated muscle force and tendon elongation (L) was fitted to a linear regression, the slope of which was defined as stiffness of the tendon structures. The training increased significantly the volume (7.6 +/- 4.3%) and MVC torque (33.9 +/- 14.4%) of quadriceps femoris muscle. The L values at force production levels beyond 550 N were significantly shorter after training. The stiffness increased significantly from 67.5 +/- 21.3 to 106.2 +/- 33.4 N/mm. Furthermore, the training significantly increased the rate of torque development (35.8 +/- 20.4%) and decreased electromechanical delay (-18.4 +/- 3.8%). Thus the present results indicate that isometric training increases the stiffness and Young's modulus of human tendon structures as well as muscle strength and size. This change in the tendon structures would be assumed to be an advantage for increasing the rate of torque development and shortening the electromechanical delay.
引用
收藏
页码:26 / 32
页数:7
相关论文
共 37 条
[1]   Early phase adaptations of muscle use and strength to isokinetic training [J].
Akima, H ;
Takahashi, H ;
Kuno, SY ;
Masuda, K ;
Masuda, T ;
Shimojo, H ;
Anno, I ;
Itai, Y ;
Katsuta, S .
MEDICINE AND SCIENCE IN SPORTS AND EXERCISE, 1999, 31 (04) :588-594
[2]  
Almeida-Silveira MI, 2000, EUR J APPL PHYSIOL, V81, P252
[3]   THE EFFECT OF IMMOBILIZATION ON COLLAGEN TURNOVER IN CONNECTIVE-TISSUE - A BIOCHEMICAL-BIOMECHANICAL CORRELATION [J].
AMIEL, D ;
WOO, SLY ;
HARWOOD, FL ;
AKESON, WH .
ACTA ORTHOPAEDICA SCANDINAVICA, 1982, 53 (03) :325-332
[4]  
[Anonymous], STRENGTH POWER SPORT
[5]   Impact of resistance exercise during bed rest on skeletal muscle sarcopenia and myosin isoform distribution [J].
Bamman, MM ;
Clarke, MSF ;
Feeback, DL ;
Talmadge, RJ ;
Stevens, BR ;
Lieberman, SA ;
Greenisen, MC .
JOURNAL OF APPLIED PHYSIOLOGY, 1998, 84 (01) :157-163
[6]  
Butler D L, 1978, Exerc Sport Sci Rev, V6, P125
[7]  
CAVAGNA GA, 1981, J EXP BIOL, V91, P131
[8]   MECHANICAL-PROPERTIES OF RAT TAIL TENDON IN RELATION TO PROXIMAL DISTAL SAMPLING POSITION AND AGE [J].
DANIELSEN, CC ;
ANDREASSEN, TT .
JOURNAL OF BIOMECHANICS, 1988, 21 (03) :207-212
[9]   Muscle architecture and function in humans [J].
Fukunaga, T ;
Kawakami, Y ;
Kuno, S ;
Funato, K ;
Fukashiro, S .
JOURNAL OF BIOMECHANICS, 1997, 30 (05) :457-463
[10]   CHANGES IN ISOMETRIC FORCE-TIME AND RELAXATION-TIME, ELECTROMYOGRAPHIC AND MUSCLE-FIBER CHARACTERISTICS OF HUMAN SKELETAL-MUSCLE DURING STRENGTH TRAINING AND DETRAINING [J].
HAKKINEN, K ;
ALEN, M ;
KOMI, PV .
ACTA PHYSIOLOGICA SCANDINAVICA, 1985, 125 (04) :573-585