PMID: 3759739Sep 1, 1986Paper

Increase in electromyogram low-frequency power in nonfatigued contracting skeletal muscle

Journal of Applied Physiology
A R BazzyG G Haddad

Abstract

We studied the relationship between changing elbow joint angle and the power spectral density of the biceps brachii muscle electromyogram (EMG) during submaximal isometric contractions. For this purpose, we recorded the EMG of the biceps brachii muscle with surface electrodes in 13 subjects. Each subject held a 2.8-kg weight and contracted the biceps isometrically for 30 s at one of two lengths. The length of the muscle was changed by flexing the forearm toward the upper arm to form an angle of 135 degrees (L1) or 45 degrees (L2). We found that the mean centroid frequency (fc) of the EMG power spectral density was 26% lower at L1 than at L2 (P less than 0.01). For each subject there was no significant change in fc during the isometric contraction at either angle. In addition, in nine subjects who sustained fatiguing contractions of the biceps with a 6-kg load, fc decreased by 15% (P less than 0.025). These data suggest that a change in the length at which a muscle contracts isometrically can alter or induce indirectly an alteration in the frequency content of its EMG. This finding may have important implications for the assessment of respiratory muscle EMG especially during loaded breathing.

Citations

Jan 1, 1991·European Journal of Applied Physiology and Occupational Physiology·M BilodeauD Bourbonnais
Jan 1, 1996·European Journal of Applied Physiology and Occupational Physiology·J H van DieënH M Toussaint
Jan 1, 1990·European Journal of Applied Physiology and Occupational Physiology·H A DaanenE A Van der Velde
Dec 22, 1998·Pediatric Pulmonology·D E MayockD E Woodrum
Aug 1, 1991·Acta Physiologica Scandinavica·B GerdleM L Wretling
Jan 1, 1989·European Journal of Applied Physiology and Occupational Physiology·R Rosenburg, H Seidel
Jan 1, 1991·European Journal of Applied Physiology and Occupational Physiology·P J BergerM H Wilkinson
Jan 1, 1988·European Journal of Applied Physiology and Occupational Physiology·B GerdleM Edström
Jan 1, 1988·European Journal of Applied Physiology and Occupational Physiology·R H Westgaard
Oct 11, 2005·Physical Medicine and Rehabilitation Clinics of North America·Jay J HanJoseph N Kornegay

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