Prior upper body exercise reduces cycling work capacity but not critical power

Johnson, Michael A. and Mills, Dean E. and Brown, Peter I. and Sharpe, Graham R. (2014) Prior upper body exercise reduces cycling work capacity but not critical power. Medicine and Science in Sports and Exercise, 46 (4). pp. 802-808. ISSN 0195-9131

Abstract

Purpose: This study examined whether metabolite accumulation, induced by prior upper body exercise, affected the power–duration relationship for leg cycle ergometry.

Methods: Seven males performed, to the limit of tolerance and both without (L) and with (AL) prior severe-intensity arm-cranking exercise, an incremental cycling test and four constant power cycling tests to determine the parameters of the power–duration relationship: critical power (CP) and W'.

Results: At the onset of cycling exercise plasma lactate (L vs AL: 1.2 ± 0.1 vs 11.6 ± 2.9 mEq.L -1) and hydrogen ion (40.4 ± 1.3 vs 53.1 ± 4.3 nEq.L -1), concentrations were higher during AL compared with L, whereas the strong ion difference (37.8 ± 1.8 vs 32.4 ± 2.0 mEq.L -1) and bicarbonate concentration (25.7 ± 0.7 vs 18.3 ± 1.9 mEq.L -1) were lower during AL compared with L (P <0.01). During incremental exercise, maximum cycling power (358 ± 15 vs 332 ± 21 W) and peak oxygen uptake (VO2peak) (4.31 ± 0.36 vs 3.71 ± 0.44 L.min -1) were lower during AL compared with L (P <0.05). The rate of increase in plasma potassium concentration during constant power cycling was greater during AL compared with L (0.09 ± 0.08 vs 0.14 ± 0.13 mEq.L -1.min -1) (P <0.05), and exercise duration was 35 ± 15% shorter (P <0.01). CP was not different between L and AL (267± 19 vs 264 ± 20 W), whereas W' was lower in AL (17.3 ± 5.7 vs 11.8 ± 4.2 kJ) (P <0.01).

Conclusion: The reduced W' after prior upper body exercise indicates that the magnitude of W' is partly dependent on metabolite accumulation.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty / Department / School: Historic - Faculty of Health, Engineering and Sciences - School of Health, Nursing and Midwifery
Date Deposited: 28 Jul 2016 03:19
Last Modified: 20 Feb 2017 01:01
Uncontrolled Keywords: power-duration relationship; metabolites, arm cranking; cycling
Fields of Research : 11 Medical and Health Sciences > 1106 Human Movement and Sports Science > 110602 Exercise Physiology
Identification Number or DOI: 10.1249/MSS.0000000000000159
URI: http://eprints.usq.edu.au/id/eprint/28762

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