Changes in hardness of the human elbow flexor muscles after eccentric exercise
Changes in hardness of the human elbow flexor muscles after eccentric exercise
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DOI：
10.1007/s004210000242
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发表时间：
2000-08-01
影响因子：
3
通讯作者：
Minamitani, K
中科院分区：
文献类型：
--
作者：
Murayama, M;Nosaka, K;Minamitani, K
本研究的目的是调查手肘屈肌离心运动后肌肉硬度的变化，产生肌肉缩短和肿胀。为了评估肌肉硬度，使用压力法，其中记录使组织（皮肤、皮下组织、肌肉）变形所需的力。11名健康男大学生用非优势臂进行24次手肘屈肌最大离心动作。分别于运动前、运动后即刻、运动后1- 5d测量肌肉硬度、最大等长肌力（MIF）、肌肉酸痛度、血浆肌酸激酶（CK）活性、肘关节松弛角（RANG）、上臂围（CIR）及B超横断面图像。MIF的长期降低、CIR和肌肉厚度增加所示的肌肉肿胀、血浆CK活性的大幅增加以及肌肉酸痛的发展表明手肘屈肌发生了损伤。在运动后1-3天，RANG下降了约20度，此后逐渐恢复。CIR在运动后逐渐增加，运动后第5天达到峰值，平均增加18 mm。屈肘位肌肉硬度在运动后3天才发生变化，但在运动后第4、5天显著增加（P < 0.01）。另一方面，当用力伸展缩短的肘关节时测得的肌肉硬度随时间显著增加（P < 0.01），并在运动后3天达到峰值。通过压力法评估的肌肉硬度似乎反映了肌肉僵硬和肿胀的变化。
The purpose of this study was to investigate changes in muscle hardness after eccentric exercise of the elbow flexors muscles that produce muscle shortening and swelling. To assess muscle hardness, a pressure method was used in which the force required to deform the tissue (skin, subcutaneous tissue, muscle) was recorded. Eleven healthy male students performed 24 maximal eccentric actions of the elbow flexor muscles with their non-dominant arms. Muscle hardness, maximal isometric force (MIF), muscle soreness, plasma creatine kinase (CK) activity, relaxed elbow joint angle (RANG), upper-arm circumference (CIR) and B-mode ultrasound transverse images were measured before, immediately after, and 1-5 days after exercise. A longlasting decrease in MIF, muscle swelling shown by increases in CIR and muscle thickness, large increases in plasma CK activity, and development of muscle soreness indicated that damage occurred to the elbow flexor muscles. The RANG had decreased by approximately 20 degrees at 1-3 days after exercise and showed a gradual recovery thereafter. The CIR increased gradually after exercise and peaked on day 5 post-exercise, the mean amount of increase in CIR being 18 mm. Muscle hardness measured at the relaxed elbow position did not change until 3 days after exercise, but increased significantly (P < 0.01) on days 4 and 5 post-exercise. On the other hand, muscle hardness measured when forcibly extending the shortened elbow joint increased significantly (P < 0.01) with time and peaked at 3 days after exercise. Muscle hardness assessed by the pressure method seems to reflect changes in muscle stiffness and swelling.