Central command and the increase in middle cerebral artery blood flow velocity during static arm exercise in women.

Published

Journal Article

We examined the role of central command in static exercise-induced increase in middle cerebral artery mean blood flow velocity (V(MCA)). Eleven young female subjects performed static elbow flexion for 2 min at 30% maximal voluntary contraction without (control exercise; CONT) and with vibrations to the biceps brachii tendon (EX+VIB) in order to reduce the effort needed to maintain the set contraction intensity. The rating of perceived exertion in exercising muscle (Arm RPE) at the end of EX+VIB was lower than that of CONT (mean +/- s.d.; 4.8 +/- 1.1 for CONT versus 3.5 +/- 1.0 for EX+VIB; P < 0.05). The increases in mean arterial pressure (36 +/- 8 versus 22 +/- 7%; P < 0.05), heart rate (36 +/- 16 versus 21 +/- 7%; P < 0.05) and cardiac output (56 +/- 26 versus 39 +/- 14%; P < 0.05) during EX+VIB were also lower than those during CONT. Similarly, the increase in the V(MCA) during EX+VIB was lower than that during CONT (29 +/- 5 versus 17 +/- 14%; P < 0.05). These results suggest that the influence of central command contributes to cerebral blood flow regulation during static exercise and the decrease in V(MCA) is likely to be caused by attenuated brain activation in the central command network and/or by the reduction in cardiac output.

Full Text

Duke Authors

Cited Authors

  • Sato, K; Sadamoto, T; Ueda-Sasahara, C; Shibuya, K; Shimizu-Okuyama, S; Osada, T; Kamo, M; Saito, M; Kagaya, A

Published Date

  • November 2009

Published In

Volume / Issue

  • 94 / 11

Start / End Page

  • 1132 - 1138

PubMed ID

  • 19648482

Pubmed Central ID

  • 19648482

Electronic International Standard Serial Number (EISSN)

  • 1469-445X

Digital Object Identifier (DOI)

  • 10.1113/expphysiol.2009.048595

Language

  • eng

Conference Location

  • England