Increased spinal excitability does not offset central activation failure

We hypothesized that if reduced spinal excitability contributes to central activation failure, then a caffeine-induced increase in spinal excitability would enhance postfatigue maximal voluntary activation and maximal voluntary contraction (MVC). Ten male volunteer subjects attended two laboratory s...

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Veröffentlicht in:Experimental brain research 2006-08, Vol.173 (3), p.446-457
Hauptverfasser: KALMAR, J. M, DEL BALSO, C, CAFARELLI, E
Format: Artikel
Sprache:eng
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Zusammenfassung:We hypothesized that if reduced spinal excitability contributes to central activation failure, then a caffeine-induced increase in spinal excitability would enhance postfatigue maximal voluntary activation and maximal voluntary contraction (MVC). Ten male volunteer subjects attended two laboratory sessions separated by at least 1 week. Contractile and electrical properties were assessed before, and 1 h after oral administration of caffeine (6 mg/kg) or placebo (all-purpose flour), and again following a fatigue protocol. The slope of the H reflex recruitment curve, normalized to that of the M wave (H(slp)/M(slp)), was used to estimate spinal excitability. Maximal voluntary activation was assessed using maximal EMG (EMG(max)) and twitch interpolation. Postfatigue, MVC torque declined (P
ISSN:0014-4819
1432-1106
DOI:10.1007/s00221-006-0383-0