Effects of prolonged walking on neural and mechanical components of stretch responses in the human soleus muscle

被引:14
作者
Cronin, Neil J. [1 ,3 ]
Ishikawa, Masaki [2 ]
af Klint, Richard [1 ]
Komi, Paavo V. [3 ]
Avela, Janne [3 ]
Sinkjaer, Thomas [1 ]
Voigt, Michael [1 ]
机构
[1] Univ Aalborg, Dept Hlth Sci & Technol, Ctr Sensory Motor Interact, Aalborg, Denmark
[2] Osaka Univ Hlth & Sport Sci, Dept Hlth & Sport Management, Osaka, Japan
[3] Univ Jyvaskyla, Dept Biol Phys Act, Neuromuscular Res Ctr, SF-40351 Jyvaskyla, Finland
来源
JOURNAL OF PHYSIOLOGY-LONDON | 2009年 / 587卷 / 17期
关键词
STANCE PHASE; RECRUITMENT GAIN; TENDON STIFFNESS; TRICEPS SURAE; IN-VIVO; REFLEX; CONTRACTIONS; MODULATION; BEHAVIOR; FATIGUE;
D O I
10.1113/jphysiol.2009.174912
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
After repeated passive stretching, tendinous tissue compliance increases in the human soleus (SOL) muscle-tendon unit. During movement, such changes would have important consequences for neural and mechanical stretch responses. This study examined the existence of such effects in response to a 75 min walking intervention. Eleven healthy subjects walked on a treadmill at 4 km h(-1) with a robotic stretch device attached to the left leg. Ultrasonography was used to measure SOL fascicle lengths, and surface EMG activity was recorded in the SOL and tibialis anterior (TA) muscles. Perturbations of 6 deg were imposed at three different measurement intervals: Pre (immediately before the walking intervention), Mid (after approximately 30 min of walking) and Post (immediately after the intervention). Between the Pre-Mid and Mid-Post intervals, subjects walked for 30 min at a gradient of 3%. After the intervention, the amplitude and velocity of fascicle stretch both decreased (by 46 and 59%, respectively; P < 0.001) in response to a constant external perturbation, as did short (33%; P < 0.01) and medium (25%; P < 0.01) latency stretch reflex amplitudes. A faster perturbation elicited at the end of the protocol resulted in a recovery of fascicle stretch velocities and short latency reflex amplitudes to the pre-exercise values. These findings suggest that repeated stretching and shortening of a muscle-tendon unit can induce short-term structural changes in the tendinous tissues during human walking. The data also highlight the effect of these changes on neural feedback from muscle sensory afferents.
引用
收藏
页码:4339 / 4347
页数:9
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