کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6206303 1265643 2014 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Phase dependent modulation of soleus H-reflex in healthy, non-injured individuals while walking with an ankle foot orthosis
موضوعات مرتبط
علوم پزشکی و سلامت پزشکی و دندانپزشکی ارتوپدی، پزشکی ورزشی و توانبخشی
پیش نمایش صفحه اول مقاله
Phase dependent modulation of soleus H-reflex in healthy, non-injured individuals while walking with an ankle foot orthosis
چکیده انگلیسی


- We examined modulation of the soleus H-reflex with an ankle foot orthosis.
- In healthy individuals, reflex excitability was higher in swing phase of walking.
- Reflex modulation with orthosis needs to be tested after neurological injury.

ObjectiveTo examine the dynamic modulation of the soleus H-reflex while walking with a posterior leaf spring ankle foot orthosis (PAFO).MethodsSoleus H-reflexes were evoked on randomly chosen lower limb of fourteen healthy individuals (age range of 22-36 years, 7 women) while walking on a treadmill with and without a PAFO. In order to capture excitability across the duration of the gait cycle, H-reflexes were evoked at heel strike (HS), HS + 100 ms, HS + 200 ms, HS + 300 ms, HS + 400 ms in the stance phase and at toe-off (TO), TO + 100 ms, TO + 200 ms, TO + 300 ms, TO + 400 ms in the swing phase respectively.ResultsH-reflex excitability was significantly higher in the form of greater slope of the rise in H-reflex amplitude across the swing phase (p = 0.024) and greater mean H-reflex amplitude (p = 0.014) in the swing phase of walking with a PAFO. There was no change in the slope (p = 0.25) or the mean amplitude of H-reflexes (p = 0.22) in the stance phase of walking with a PAFO. Mean background EMG activity between the two walking conditions was not significantly different for both the tibialis anterior (p = 0.69) and soleus muscles (p = 0.59).ConclusionPAFO increased reflex excitability in the swing phase of walking in healthy individuals. Altered sensory input originating from joint, muscle and cutaneous receptors may be the underlying mechanism for greater reflex excitability. The neurophysiological effect of PAFOs on reflex modulation during walking needs to be tested in persons with neurological injury. The relationship between the sensory input and the reflex output during walking may assist in determining if there exists a neurological disadvantage of using a compensatory device such as a PAFO.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Gait & Posture - Volume 39, Issue 4, April 2014, Pages 1086-1091
نویسندگان
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