Greater cross education following training with muscle lengthening than shortening
Greater cross education following training with muscle lengthening than shortening
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DOI：
10.1097/00005768-199701000-00015
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发表时间：
1997-01-01
期刊：
影响因子：
--
通讯作者：
Hill, JP
中科院分区：
文献类型：
--
作者：
Hortobagyi, T;Lambert, NJ;Hill, JP
假设进行了测试，交叉教育的幅度是更大的训练与肌肉延长比缩短。对侧同心，偏心，等长力量和股外侧肌和股二头肌表面肌电图（EMG）活动的变化进行了分析组的年轻男子行使同侧股四头肌偏心（N = 7）或同心（N = 8）收缩36届超过12周。对照组受试者（N = 6）未接受训练。向心训练使向心力量增加30%，等长力量增加22%，离心训练使离心力量增加77%，等长力量增加39%（均P < 0.05）。离心训练对离心力量的提高是向心训练的3倍（P < 0.05），离心训练对等长力量的提高是向心训练的2倍（P < 0.05）。离心力训练组在离心力和等长力量训练中较训练前有显著提高（P < 0.05）。对照组无明显变化（P> 0.05）。股外侧肌表面肌电活动偏心组较向心组训练前增加2.2倍，训练中增加2.8倍，训练前增加2.6倍（P < 0.05）。对照组肌电活动无明显变化（P > 0.05）。得出的结论是，更大的交叉教育与肌肉延长训练是最有可能介导的传入和传出机制，使以前久坐的科目，以实现更大的激活未经训练的肢体肌肉组织。
The hypothesis was tested that the magnitude of cross education is greater following training with muscle lengthening than shortening. Changes in contralateral concentric, eccentric, and isometric strength and vastus lateralis and biceps femoris surface electromyographic (EMG) activity were analyzed in groups of young men who exercised the ipsilateral quadriceps with either eccentric (N = 7) or concentric (N = 8) contractions for 36 sessions over 12 wk. Control subjects (N = 6) did not train. Concentric training increased concentric strength 30% and isometric strength 22%, and eccentric training increased eccentric strength 77% and isometric strength 39% (all P < 0.05). Eccentric training improved eccentric strength three times more than the concentric training improved concentric strength (P < 0.05), and eccentric compared with concentric training improved isometric strength about 2 times more (P < 0.05). The eccentric group improved significantly from pre- to mid-training in eccentric and isometric strength (P < 0.05). The control group showed no significant changes (P < 0.05). Surface EMG activity of the vastus lateralis increased 2.2 times (pre to mid-training), 2.8 (mid- to post-training) and 2.6 more (pre- to posttraining) (P < 0.05) in the eccentric than concentric group. No significant changes in EMG activity occurred in the control group (P > 0.05). It was concluded that the greater cross education following training with muscle lengthening is most likely being mediated by both afferent and efferent mechanisms that allow previously sedentary subjects to achieve a greater activation of the untrained limb musculature.