European Journal of Applied Physiology

, Volume 110, Issue 1, pp 27–38

Age independent and position-dependent alterations in motor unit activity of the biceps brachii

Original Article

DOI: 10.1007/s00421-010-1438-2

Cite this article as:
Harwood, B., Edwards, D.L. & Jakobi, J.M. Eur J Appl Physiol (2010) 110: 27. doi:10.1007/s00421-010-1438-2


In the biceps brachii, age-related differences in synaptic excitability and muscle architecture may affect motor unit (MU) activity differently depending on the position of the forearm. It was hypothesised that as a result of these age-related differences, greater changes in MU activity would accompany a change in forearm position in old when compared with young men. Six young (22 ± 3 years) and six old (84 ± 3 years) men maintained isometric elbow flexion at 10% of maximal voluntary contraction (MVC) during changes in forearm position. Forty-nine MUs in the short (SBB) and long (LBB) heads of the biceps brachii were followed. Motor unit recruitment and de-recruitment thresholds, motor unit discharge rates (MUDRs), and MU discharge variability were measured. Although an age-related decrease in MU recruitment thresholds, and increase in MU discharge variability was evident, changes in forearm position influenced MUDRs similarly in young and old men (P = 0.27). Motor unit recruitment thresholds of the SBB were highest in the pronated position (8.2 ± 2.9 %MVC), whereas in the LBB they were highest in the supinated position (8.6 ± 2.0 %MVC). Motor unit discharge rates of the LBB did not change with forearm position. In the SBB, MUDRs were highest when the forearm was supinated, and also greater when compared with the LBB in this position. No position-dependent changes were observed for MU discharge variability in the LBB, but the SBB exhibited greatest MU discharge variability in the pronated position. The results suggest that MU activity is modulated following a change in forearm position, but the response is similar in young and old adults.

Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  1. 1.School of KinesiologyUniversity of Western OntarioLondonCanada
  2. 2.Faculty of Human KineticsUniversity of WindsorWindsorCanada
  3. 3.Faculty of Health and Social DevelopmentUniversity of British Columbia OkanaganKelownaCanada

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