کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6207975 1265667 2013 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Arm reactions evoked by the initial exposure to a small balance perturbation: A pilot study
ترجمه فارسی عنوان
واکنش های بازوی ناشی از مواجهه اولیه با یک اختلال متعادل متعادل: یک مطالعه آزمایشی
موضوعات مرتبط
علوم پزشکی و سلامت پزشکی و دندانپزشکی ارتوپدی، پزشکی ورزشی و توانبخشی
چکیده انگلیسی

Perturbation of whole-body stability often evokes rapid arm reactions. It has been suggested that the earliest arm activation is a generic (e.g. startle-like) response to which a later stabilizing (e.g. counterweight or reach-to-grasp) or impact-protection component can be appended. To examine whether the initial part of the reaction is generic, we examined arm reactions evoked by small balance perturbations in 12 healthy young adults while varying perturbation direction (rightward or forward platform translation) and environmental conditions (handrail present or absent). The perturbation magnitude was selected to be sufficiently small to obviate the need to use the arms for stabilization. To avoid adaptation or habituation, analysis focused on each subject's very first exposure to the perturbation. Most subjects exhibited active movement of both arms in reaction to the perturbation, but there was large (non-stereotypical) inter-subject variation in muscle-onset latency and arm kinematics. Furthermore, the velocity and direction of the initial arm movement were affected by perturbation direction, in a manner consistent with functional strategies (counterweight strategy in backward falls, hybrid counterweight/protective strategy in leftward falls). Although subjects never contacted the handrail, responses were slower when it was present. These results are not consistent with a generic stereotyped response, but suggest instead that even the earliest component of first-trial arm reactions was functionally modulated.

► We examine arm reactions evoked by small balance perturbations. ► Analysis focus on each subject's very first exposure to the perturbation. ► Speed and direction of initial arm movements are affected by perturbation direction. ► Results give support for a complex environment-dependent modulation of the reaction. ► Results are clearly not consistent with a generic stereotyped response.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Gait & Posture - Volume 37, Issue 2, February 2013, Pages 300-303
نویسندگان
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