Abstract:
:Although a neural component has been suggested to contribute to the energetic cost of muscle contraction in vivo, the association between neural and energetic factors has not been determined during voluntary contractions in humans. Twenty young (24±1years, 10 women) healthy individuals performed isometric ankle dorsiflexion contractions at 20%, 50% and 100% of maximal voluntary contraction torque on two occasions during which measures of either motor unit discharge rates (MUDR, by indwelling electromyography) or ATP cost of contraction (by (31)P magnetic resonance spectroscopy) were obtained. Both MUDR and ATP cost increased with increasing contraction intensity (p≤0.02). A strong, positive relationship (r(2)=0.70; p<0.001) was observed between MUDR and ATP cost. These results suggest that a substantial portion of the variability in ATP cost can be explained by MUDR, and thus demonstrate that motor unit rate coding is likely an important neural factor contributing to energetic cost in vivo.
journal_name
Neurosci Lettjournal_title
Neuroscience lettersauthors
Christie AD,Foulis SA,Kent JAdoi
10.1016/j.neulet.2016.07.007subject
Has Abstractpub_date
2016-08-26 00:00:00pages
186-188eissn
0304-3940issn
1872-7972pii
S0304-3940(16)30493-1journal_volume
629pub_type
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