ISOKINETIC HAMSTRING QUADRICEPS STRENGTH RATIO - INFLUENCE FROM JOINT ANGULAR VELOCITY, GRAVITY CORRECTION AND CONTRACTION MODE
ISOKINETIC HAMSTRING QUADRICEPS STRENGTH RATIO - INFLUENCE FROM JOINT ANGULAR VELOCITY, GRAVITY CORRECTION AND CONTRACTION MODE
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DOI：
10.1111/j.1748-1716.1995.tb09927.x
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发表时间：
1995-08-01
期刊：
影响因子：
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通讯作者：
KLAUSEN, K
中科院分区：
文献类型：
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作者：
AAGAARD, P;SIMONSEN, EB;KLAUSEN, K
本研究调查等速峰值和角度特定的腿筋/股四头肌的力量比（传统的H/Q比）在向心性和离心肌肉收缩，并检查关节角速度的影响和重力校正对这些比率的影响。此外，通过计算相对于向心股四头肌力量的离心腘绳肌力量（H-ecc/Q（con），代表膝关节伸展）和相对于离心股四头肌力量的向心腘绳肌力量（H-con/Q（ecc），代表膝关节屈曲）来定义“功能性”H/Q比。根据关节角速度为30、120和240度s（-1）时获得的等速峰值力矩和50度力矩（0度=完全伸展）计算H/Q比。重力校正的常规H/Q比在速度和收缩模式下保持恒定，基于峰值和50度力矩，范围分别为0.47至0.54和0.49至0.56。相反，在向心性收缩期间，未校正的H/Q比从30 ° s（-1）时的0.58增加到240 ° s（-1）时的0.74（P < 0.01）。对于240 ° s（-1）的膝关节伸展，观察到H-ecc/Q（con）为1.05（峰值）和0.89（50度），而对于240 ° s（-1）的屈曲，观察到H-con/Q（ecc）为0.27（峰值）和0.28（50度）。因此，重力校正对H/Q比值随拉伸速度变化的影响较大。对于快速膝关节伸展，证明了潜在的1：1的腿筋/股四头肌力量关系，表明在这种情况下，腿筋肌肉具有显著的功能能力，可以在膝关节处提供肌肉稳定性。
This study investigated isokinetic peak- and angle-specific hamstring/quadriceps strength ratios (conventional H/Q ratio) obtained during concentric and eccentric muscle contraction and examined the influence of joint angular velocity and the effect of gravity correction on these ratios. Also, a 'functional' H/Q ratio was defined by calculating eccentric hamstring strength relative to concentric quadriceps strength (H-ecc/Q(con), representative for knee extension) and calculating concentric hamstring strength relative to eccentric quadriceps strength (H-con/Q(ecc), representative for knee flexion). The H/Q ratio was calculated based on isokinetic peak moment and 50 degrees-moment (0 degrees = full extension) obtained at joint angular velocities 30, 120 and 240 degrees s(-1). Gravity corrected conventional H/Q ratio remained constant across speeds and contraction mode, ranging from 0.47 to 0.54 and from 0.49 to 0.56 based on peak and 50 degrees moment, respectively. In contrast, non-corrected H/Q ratio increased during concentric contraction from 0.58 at 30 degrees s(-1) to 0.74 at 240 degrees s(-1) (P < 0.01). For knee extension at 240 degrees s(-1) an H-ecc/Q(con) of 1.05 (peak) and 0.89 (50 degrees) was observed while for flexion at 240 degrees s(-1) an H-con/Q(ecc) of 0.27 (peak) and 0.28 (50 degrees) was observed. In conclusion, gravity correction had high influence on the change in H/Q ratio with variation in extension velocity. ii potential 1:1 hamstring/quadriceps strength relationship was demonstrated for fast knee extension, indicating a significant functional capacity of the hamstring muscles for providing muscular stability at the knee joint in such situations.