Central European Journal of Sport Sciences and Medicine

ISSN: 2300-9705     eISSN: 2353-2807
CC BY-SA   Open Access 

Lista wydań / Vol. 10, No. 2/2015
Peripheral Artery Disease and Activity-Induced Shifts in Quadriceps Median Frequency during Treadmill Walking: A Preliminary Study

Rok wydania:2015
Liczba stron:11 (13-23)
Słowa kluczowe: peripheral artery disease fatigue median frequency gait EMG aging
Autorzy: Jennifer A. Bunn
Department of Exercise Science, Campbell University, Buies Creek, NC, USA; 4 Department of Physical Therapy, Campbell University, Buies Creek, North Carolina, USA

Douglas W. Powell
Department of Physical Therapy, College of Pharmacy & Health Sciences, Campbell University, Buies Creek, NC, USA; Department of Physiology, School of Osteopathic Medicine, Campbell University, Buies Creek, NC, USA

Rebecca J. Reed-Jones
Department of Kinesiology, University of Prince Edward Island, Charlottetown, Prince Edward Island, CA

Meggan M. Walker
Department of Exercise Science, College of Education, Department of Exercise Science, Fairmont State University, Fairmont, West Virginia, USA

Abstrakt

Peripheral artery disease (PAD) is associated with altered gait biomechanics. No previous research study has investigated the effect of activity on muscle activation in individuals with PAD. The purpose of this study was to investigate the effect of PAD on muscle activation in response to a ten-minute walking task. METHODS: Ten healthy young adults, ten healthy older adults and ten individuals with PAD performed a ten-minute treadmill walking trial at a self-selected velocity. Surface EMG was recorded from the vastus lateralis and medial gastrocnemius during five steps in the first and tenth minutes of the walking trial. EMG signals were rectified and smoothed using the root mean squared (RMS) with a 20 ms smoothing window. Peak RMS EMG and median frequencies (MdF) were calculated. Mixed-model ANOVAs with Tukey’s post-hoc was used to determine effects of group and activity on peak RMS EMG and MdF. RESULTS: PAD was associated with significantly greater reductions in MdF of the vastus lateralis compared to healthy young and healthy older adults. No significant differences were observed in peak RMS EMG. DISCUSSION: PAD is associated with exaggerated rates of fatigue in the quadriceps but not the gastrocnemius. Efficacy of evidence-based therapeutic interventions should be further investigated.
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