Stretch reflex distinguished from pre-programmed muscle activations following landing impacts in man
Stretch reflex distinguished from pre-programmed muscle activations following landing impacts in man
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DOI：
10.1111/j.1469-7793.2000.t01-1-00457.x
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发表时间：
2000-07-15
影响因子：
5.5
通讯作者：
McDonagh, MJN
中科院分区：
文献类型：
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作者：
Duncan, A;McDonagh, MJN
1.当人类受试者跳到他们下面0.45米的固体表面上，然后跳到同一水平的假可折叠表面上时，测量肌电活动和关节旋转。可折叠的表面没有产生踝关节旋转。研究目的：起跳后肌电发作潜伏期的证据显示，受试者对假表面感到惊讶.在固体表面着陆后，腓肠肌和比目鱼肌分别在53和56 ms的潜伏期出现峰值反应，拮抗剂M。胫骨肌前表面出现一个潜伏期为26 ms的早期峰值反应，这些反应发生在落地后的固体表面上，而不是通过假表面.股直肌和股二头肌在这个下降距离没有明显的反射活动，但在撞击后明显存在预先编程的活动。结果表明，M.比目鱼肌和m.腓肠肌是由踝关节旋转触发的短潜伏期脊髓反射。
1. Electromyographic activity and joint rotation were measured whilst human subjects jumped clown to land on a solid surface 0.45 m below them and then to a false collapsible surface at the same level. The collapsible surface did not produce ankle joint rotation. Objective: evidence from post-take-off EMG onset latencies showed that the subjects were surprised by the false surface.2. Following landing on the solid surface, the gastrocnemius and soleus muscles showed peak responses at latencies of 53 and 56 ms, respectively, and the antagonist m. tibialis. anterior showed an early peak response with a latency of 26 ms. These responses occurred following landing on the solid surface but not following passage through the false surface.3. The rectus femoris and biceps femoris muscles showed no clear reflex activity with this fall distance but pre-programmed activity was clearly present following impact.4. It is: concluded that the post-landing activity in m. soleus and m. gastrocnemius is a short-latency spinal reflex triggered by ankle joint rotation.