Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/23908
Appears in Collections:Faculty of Health Sciences and Sport Journal Articles
Title: EMG amplitude in maximal and submaximal exercise is dependent on signal capture rate
Authors: Hunter, Angus
Gibson, Alan St Clair
Lambert, Michael
Dennis, Stephen C
Mullany, Hugh
O'Malley, Mark J
Vaughan, Christopher L
Kay, Derek
Noakes, Timothy D
Contact Email: a.m.hunter1@stir.ac.uk
Keywords: EMG
isometric contraction
cycling activity
Issue Date: Feb-2003
Publisher: Thieme Publishing / Georg Thieme Verlag
Citation: Hunter A, Gibson ASC, Lambert M, Dennis SC, Mullany H, O'Malley MJ, Vaughan CL, Kay D & Noakes TD (2003) EMG amplitude in maximal and submaximal exercise is dependent on signal capture rate, International Journal of Sports Medicine, 24 (2), pp. 83-89.
Abstract: This study analysed the effect of different electromyographic (EMG) capture rates during maximal voluntary contraction, submaximal and maximal dynamic cycling activity on EMG amplitude and signal characteristics. Ten healthy subjects participated in this study. Peak power output (PPO) and maximal isometric force output (MVC) were measured, followed by a progressive cycle ride on a cycle ergometer. Electromyographic (EMG) data were simultaneously captured during the MVC and cycling activities at frequencies of 32, 64, 128, 256, 512, 1024 and 1984 Hz. Significant differences in amplitude were found (p < 0.01) between MVC, submaximal (SUB) and maximal cycling activities (PWATT) for all capture rates. Asymptote values for IEMG amplitude occurred at EMG capture rates of 1604 ± 235.6 Hz during MVC, 503.1 ± 236.2 Hz during PWATT and 326.2 ± 105.4 Hz during SUB cycling activity and were significantly different (p < 0.01). No significant differences were found for force/EMG ratios between PWATT and MVC at 1984 Hz capture rates (3.8 ± 1.7 N/V vs 2.5 ± 0.9 N/V) while significant differences occurred at 32 Hz capture rate (6.2 ± 3.8 vs 16.0 ± 8.0; p < 0.01). Low correlations were found between EMG activity captured at 1984 Hz during PWATT and lean thigh volume (r = 0.36) and MVC (r = 0.32). Asymptote values found on this study suggest that data captured below 326 Hz for SUB, 503 Hz for PWATT and 1604 Hz for MVC are not reliable. Therefore apparatus capturing EMG data at low frequencies from these values cannot be used for quantitative data analyses.
Type: Journal Article
URI: http://hdl.handle.net/1893/23908
DOI Link: http://dx.doi.org/10.1055/s-2003-38196
Rights: Publisher policy allows this work to be made available in this repository. Published in International Journal of Sports Medicine 2003; 24(2): 83-89 by Thieme. The original publication is available at: http://dx.doi.org/10.1055/s-2003-38196
Affiliation: Sport
University of Cape Town
University of Cape Town
University of Cape Town
University College Dublin (UCD)
University College Dublin (UCD)
University of Cape Town
Charles Sturt University
University of Cape Town

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