Withdrawal reflexes in the upper limb adapt to arm posture and stimulus location.
نویسندگان
چکیده
INTRODUCTION Withdrawal reflexes in the leg adapt in a context-appropriate manner to remove the limb from noxious stimuli, but the extent to which withdrawal reflexes adapt in the arm remains unknown. METHODS We examined the adaptability of withdrawal reflexes in response to nociceptive stimuli applied in different arm postures and to different digits. Reflexes were elicited at rest, and kinetic and electromyographic responses were recorded under isometric conditions, thereby allowing motorneuron pool excitability to be controlled. RESULTS Endpoint force changed from a posterior-lateral direction in a flexed posture to predominantly a posterior direction in a more extended posture [change in force angle (mean ± standard deviation) 35.6 ± 5.0°], and the force direction changed similarly with digit I stimulation compared with digit V (change = 22.9 ± 2.9°). CONCLUSIONS The withdrawal reflex in the human upper limb adapts in a functionally relevant manner when elicited at rest.
منابع مشابه
The nociceptive withdrawal reflex does not adapt to joint position change and short-term motor practice [version 2; referees: 2 approved] Previously titled: Adaptability of the nociceptive withdrawal reflex
The nociceptive withdrawal reflex is a protective mechanism to mediate interactions within a potentially dangerous environment. The reflex is formed by action-based sensory encoding during the early post-natal developmental period, and it is unknown if the protective motor function of the nociceptive withdrawal reflex in the human upper-limb is adaptable based on the configuration of the arm or...
متن کاملThe nociceptive withdrawal reflex does not adapt to joint position change and short-term motor practice
The nociceptive withdrawal reflex is a protective mechanism to mediate interactions within a potentially dangerous environment. The reflex is formed by action-based sensory encoding during the early post-natal developmental period, and it is unknown if the protective motor function of the nociceptive withdrawal reflex in the human upper-limb is adaptable based on the configuration of the arm or...
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ورودعنوان ژورنال:
- Muscle & nerve
دوره 49 5 شماره
صفحات -
تاریخ انتشار 2014