Journal article
Handedness but not dominance influences variability in endurance time for sustained, submaximal contractions
Journal of neurophysiology, Vol.108(5), pp.1501-1510
09/01/2012
DOI: 10.1152/jn.01144.2011
PMID: 22696537
Abstract
The purpose of this study was to compare endurance time and accompanying neuromuscular adjustments when left- and right-handed subjects used the dominant and nondominant arms to sustain submaximal contractions that required either force or position control. Ten left-handed and 10 right-handed healthy adults (21 ± 5 yr) participated in the study. Each subject exerted a similar net torque about the elbow joint during the force and position tasks to achieve a target force of 20% maximal voluntary contraction (MVC) force (56 ± 18 N). MVC force declined to a similar level immediately after task failure for left- and right-handed subjects (27 ± 13 vs. 25 ± 15%, P = 0.9). Endurance time for the position task was similar for the dominant and nondominant arms (task × dominance interaction, P = 0.17). Although the difference in endurance time between the two tasks was similar for left-handed (136 ± 165 s) and right-handed individuals (92 ± 73 s, task × handedness interaction, P = 0.38), there was greater variance in the ratio of the endurance times for the force and position tasks for left-handed (0.77) than right-handed subjects (0.13, P < 0.001; see Fig. 2 ). Furthermore, endurance time for the force and position tasks was significantly correlated for right-handed subjects ( r2 = 0.62, P < 0.001), but not for left-handed subjects ( r2 = 0.004, P = 0.79). Multiple regression analyses identified sets of predictor variables for each endurance time, and these differed with handedness and task. Hand dominance, however, did not influence endurance time for either group of subjects. These findings indicate that endurance times for the elbow flexors when performing submaximal isometric contractions that required either force or position control were not influenced by hand dominance but did depend on handedness.
Details
- Title: Subtitle
- Handedness but not dominance influences variability in endurance time for sustained, submaximal contractions
- Creators
- Nicole M Gordon - Department of Integrative Physiology, University of Colorado, Boulder, ColoradoThorsten Rudroff - Department of Integrative Physiology, University of Colorado, Boulder, ColoradoJoel A Enoka - Department of Integrative Physiology, University of Colorado, Boulder, ColoradoRoger M Enoka - Department of Integrative Physiology, University of Colorado, Boulder, Colorado
- Resource Type
- Journal article
- Publication Details
- Journal of neurophysiology, Vol.108(5), pp.1501-1510
- DOI
- 10.1152/jn.01144.2011
- PMID
- 22696537
- NLM abbreviation
- J Neurophysiol
- ISSN
- 0022-3077
- eISSN
- 1522-1598
- Language
- English
- Date published
- 09/01/2012
- Academic Unit
- Neurology; Health, Sport, and Human Physiology
- Record Identifier
- 9984002370002771
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