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Vol. 84, Issue 1, 284-291, January 1998
Department of Biomedical Engineering, Cleveland Clinic Foundation, Cleveland, Ohio 44195; and Department of Kinesiology, University of Colorado, Boulder, Colorado 80309
De Serres, Sophie J., and Roger M. Enoka. Older adults
can maximally activate the biceps brachii muscle by voluntary command.
J. Appl. Physiol. 84(1): 284-291, 1998.
Because some of the decline in strength with age may be
explained by an impairment of muscle activation, the purpose of this
study was to determine the activation level achieved in biceps brachii
by older adults during a maximum voluntary contraction (MVC). This
capability was assessed with two superimposition techniques: one
calculated the activation level that was achieved during an MVC, and
the other provided an estimate of the expected MVC force based on extrapolation with submaximal forces. The activation level in biceps
brachii was incomplete (<100%) for the young
(n = 16) and elderly
(n = 16) subjects, with the elderly
subjects exhibiting the greater deficit. In contrast, there was no
difference between the measured and expected MVC forces for either
group of subjects, whether the extrapolation involved a third-order
polynomial or linearization of the data. Because of the lower
signal-to-noise ratio associated with the measurement of activation
level and the greater number of measurements that contributed to the
estimate of the expected MVC force, we conclude that the older adults
were able to achieve complete activation of the biceps brachii muscle during an MVC.
muscle strength; maximum voluntary contraction; evoked force; activation level
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