Effect of elbow joint angle on the magnitude of muscle damage to the elbow flexors.
Effect of elbow joint angle on the magnitude of muscle damage to the elbow flexors.
复制标题
肘关节角度对肘屈肌损伤程度的影响。
DOI：
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复制
发表时间：
2001
影响因子：
4.1
通讯作者：
K. Sakamoto
中科院分区：
文献类型：
--
作者：
K. Nosaka;K. Sakamoto
目的
研究表明，与短肌肉长度的偏心动作相比，长肌肉长度的离心动作会导致更大的力量下降和更多的肌肉压痛。为了进一步探讨肘关节角度对肌肉损伤发展的影响，本研究比较了两种最大离心运动方案，其中动作起始位置不同，但运动幅度相同。
方法
10名男学生的一只手臂在肘关节角度0.87至2.27拉德（50-130度：S条件）下进行24次肘屈肌最大偏心动作，另一只手臂在肘关节角度1.74至3.14拉德（100-180度：L条件）下进行24次最大偏心动作。在这两种情况下，在运动前和运动后 5 d 测量最大等长力、运动范围、肌肉酸痛、血浆肌酸激酶活性、上臂周长和肘屈肌 (US) 的 B 型超声图像。运动后 4 天进行上臂横向扫描的磁共振成像 (MRI)。
结果
在这两种情况下运动后，所有测量值均发生显着变化（P < 0.01）；然而，与 S 条件相比，L 条件下的测量值变化显着（P < 0.01）。 MRI 和 US 显示，S 状况下仅肱肌受损，L 状况下肱二头肌也受损。
结论
与 S 状态相比，L 状态下肌肉损伤更大，可能与肘屈肌受锻炼影响有关。
PURPOSE
It has been shown that eccentric actions at a long muscle length result in a larger decrease in force and more muscle tenderness compared with those at a short muscle length. To further investigate the effect of elbow joint angle on the development of muscle damage, this study compared two maximal eccentric exercise regimens in which the starting position of the action was different, but the range of movement was the same.
METHODS
One arm of 10 male students performed 24 maximal eccentric actions of the elbow flexors at the elbow joint angle from 0.87 to 2.27 rad (50-130 degrees: S condition) and the other arm at the elbow joint angle from 1.74 to 3.14 rad (100-180 degrees: L condition). Maximal isometric force, range of motion, muscle soreness, plasma creatine kinase activity, upper arm circumference, and B-mode ultrasound pictures of the elbow flexors (US) were measured before and for 5 d postexercise in both conditions. Magnetic resonance imaging (MRI) of the transverse scans of the upper arm was taken at 4 d after exercise.
RESULTS
All measures changed significantly (P < 0.01) after exercise for both conditions; however, significantly (P < 0.01) larger changes in the measures were found in the L condition compared with the S condition. MRI and US displayed that only the brachialis was damaged for the S condition but the biceps brachii was also damaged for the L condition.
CONCLUSION
The greater development of muscle damage in the L condition compared with the S condition is likely to be associated with the elbow flexors muscles affected by the exercise.
影响因子：
2.4
作者：
MURRAY, WM;DELP, SL;BUCHANAN, TS
通讯作者：
BUCHANAN, TS
收缩引起的单肌纤维损伤：拉伸速度不影响力不足。
DOI：
10.1152/ajpcell.1998.275.6.c1548
发表时间：
1998
期刊：
The American journal of physiology
影响因子：
--
作者：
Lynch,GS;Faulkner,JA
通讯作者：
Faulkner,JA
影响因子：
3.3
作者：
Hunter, KD;Faulkner, JA
通讯作者：
Faulkner, JA