Influence of fatigue on EMG/force ratio and cocontraction in cycling

被引:118
作者
Hautier, CA
Arsac, LM
Deghdegh, K
Souquet, J
Belli, A
Lacour, JR
机构
[1] Fac Med Lyon Sud, Lab Physiol GIP Exercise, F-69921 Oullins, France
[2] Univ Lyon 1, Lab Elect Mesure & Instrumentat, F-69622 Villeurbanne, France
[3] Univ Franche Comte, Lab Sci Sport, UFR STAPS, F-25030 Besancon, France
[4] Univ Blaise Pascal, UFR STAPS, F-63172 Aubiere, France
[5] Univ Bordeaux 1, Fac Sci Sport & Educ Phys, F-33405 Talence, France
关键词
repeated sprints; peripheral fatigue; coactivation; muscle coordination;
D O I
10.1097/00005768-200004000-00017
中图分类号
G8 [体育];
学科分类号
04 ; 0403 ;
摘要
Purpose: The purpose of the present study was to observe force and power losses and electromyographic manifestations of fatigue during repeated sprints performed on a friction-loaded cycle ergometer. Methods: Ten subjects performed 15 maximal 5-s sprints with 25-s rests between them. Power, velocity, and torque were measured during sprints 1 and 13 and during two submaximal constant-velocity (50 rpm) periods of cycling performed before and after the sprints. The EMG signals of five leg muscles were stored to determine the EMG/force ratio of power producer muscles and the coactivation of antagonist muscles. The power producer muscles were activated to the same level during sprints 1 and 13, despite a loss of force, whereas the vastus lateralis muscle was recruited more during the submaximal cycling period under fatigue conditions. Results: This led to an increased EMG/force ratio for the power producer muscles, indicating the peripheral fatigue status of these muscles. Antagonist muscles were less activated during the sprints after fatigue; whereas they stayed unchanged during the last submaximal cycling period. Conclusions: This suggests that there is a decrease in coactivation as agonist force is lost. This decrease in coactivation under fatigue conditions has not been previously reported and is probably due to the training status of the subjects. Subjects may have learned to better use their antagonist muscles to efficiently transfer force and power to the rotating pedal. This coordination can be adapted to cope with fatigue of the power producer muscles.
引用
收藏
页码:839 / 843
页数:5
相关论文
共 30 条
[21]   Inertial-load method determines maximal cycling power in a single exercise bout [J].
Martin, JC ;
Wagner, BM ;
Coyle, EF .
MEDICINE AND SCIENCE IN SPORTS AND EXERCISE, 1997, 29 (11) :1505-1512
[22]   ELECTROMYOGRAPHIC EVIDENCE OF SELECTIVE FATIGUE DURING THE ECCENTRIC PHASE OF STRETCH SHORTENING CYCLES IN MAN [J].
MORITANI, T ;
ODDSON, L ;
THORSTENSSON, A .
EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY AND OCCUPATIONAL PHYSIOLOGY, 1990, 60 (06) :425-429
[23]  
MORITANI T, 1982, MED SCI SPORT EXER, V14, P198
[24]   ELECTROMYOGRAPHIC CHANGES IN WORK-RELATED MYALGIA OF THE TRAPEZIUS MUSCLE [J].
OBERG, T ;
SANDSJO, L ;
KADEFORS, R ;
LARSSON, SE .
EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY, 1992, 65 (03) :251-257
[25]  
Poortmans, 1983, BIOCH EXERCISE, P3
[26]   BEHAVIOR OF COACTIVE MUSCLES DURING FATIGUE [J].
PSEK, JA ;
CAFARELLI, E .
JOURNAL OF APPLIED PHYSIOLOGY, 1993, 74 (01) :170-175
[27]   INFLUENCE OF LACTATE ACCUMULATION OF EMG FREQUENCY-SPECTRUM DURING REPEATED CONCENTRIC CONTRACTIONS [J].
TESCH, PA ;
KOMI, PV ;
JACOBS, I ;
KARLSSON, J ;
VIITASALO, JT .
ACTA PHYSIOLOGICA SCANDINAVICA, 1983, 119 (01) :61-67
[28]   Role of cocontraction in the O-2 cost of walking in children with cerebral palsy [J].
Unnithan, VB ;
Dowling, JJ ;
Frost, G ;
BarOr, O .
MEDICINE AND SCIENCE IN SPORTS AND EXERCISE, 1996, 28 (12) :1498-1504
[29]  
VONINGENSCHENAU GJ, 1989, HUMAN MOV SCI, V8, P423
[30]  
VONINGENSCHENAU GJ, 1989, HUMAN MOV SCI, V8, P301