PMID: 11897861Mar 19, 2002Paper

Effects of prior contractions on muscle microvascular oxygen pressure at onset of subsequent contractions

The Journal of Physiology
Brad J BehnkeDavid C Poole

Abstract

In humans, pulmonary oxygen uptake (.V(O2)) kinetics may be speeded by prior exercise in the heavy domain. This "speeding" arises potentially as the result of an increased muscle O(2) delivery (.Q(O2)) and/or a more rapid elevation of oxidative phosphorylation. We adapted phosphorescence quenching techniques to determine the.Q(O2)-to-O(2) utilization (.Q(O2)/.V(O2)) characteristics via microvascular O(2) pressure (P(O2,m)) measurements across sequential bouts of contractions in rat spinotrapezius muscle. Spinotrapezius muscles from female Sprague-Dawley rats (n = 6) were electrically stimulated (1 Hz twitch, 3-5 V) for two 3 min bouts (ST(1) and ST(2)) separated by 10 min rest. P(O2,m) responses were analysed using an exponential + time delay (TD) model. There was no significant difference in baseline and DeltaP(O2,m) between ST(1) and ST(2) (28.5 +/- 2.6 vs. 27.9 +/- 2.4 mmHg, and 13.9 +/- 1.8 vs. 14.1 +/- 1.3 mmHg, respectively). The TD was reduced significantly in the second contraction bout (ST(1), 12.2 +/- 1.9; ST(2), 5.7 +/- 2.2 s, P < 0.05), whereas the time constant of the exponential P(O2,m) decrease was unchanged (ST(1), 16.3 +/- 2.6; ST(2), 17.6 +/- 2.7 s, P > 0.1). The shortened TD found in ST(2) led to a reduced ti...Continue Reading

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Citations

Sep 30, 2005·European Journal of Applied Physiology·Masako EndoYoshiyuki Fukuba
Jan 24, 2007·European Journal of Applied Physiology·A MarlesF Prieur
Sep 20, 2011·European Journal of Applied Physiology·Glen R BelfryScott G Thomas
Nov 12, 2002·Respiratory Physiology & Neurobiology·Brad J BehnkeDavid C Poole
Aug 1, 2012·Critical Care Medicine·Robert T DavisBradley J Behnke
Aug 28, 2012·American Journal of Physiology. Heart and Circulatory Physiology·Daniel M HiraiDavid C Poole
Nov 16, 2012·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·S KogaM C Hogan
Jun 9, 2012·Journal of Applied Physiology·Daniel M HiraiDavid C Poole
Nov 11, 2003·Sports Medicine·Andrew M JonesMark Burnley
Feb 24, 2016·Respiratory Physiology & Neurobiology·Mustafa Özdal
Jul 22, 2009·Respiratory Physiology & Neurobiology·Brad J BehnkeDavid C Poole
Nov 11, 2008·Experimental Physiology·Anni Vanhatalo, Andrew M Jones
Mar 18, 2008·Respiratory Physiology & Neurobiology·Andrew M JonesKevin G Thompson
Feb 15, 2005·Experimental Physiology·Leonardo F FerreiraThomas J Barstow
Mar 16, 2005·Respiratory Physiology & Neurobiology·Brad J BehnkeDavid C Poole
Dec 13, 2005·Respiratory Physiology & Neurobiology·Daryl P Wilkerson, Andrew M Jones
Apr 26, 2005·Respiratory Physiology & Neurobiology·Leonardo F FerreiraThomas J Barstow
May 14, 2005·Journal of Applied Physiology·Nicole D PatersonDonald H Paterson
Jul 2, 2009·Medicine and Science in Sports and Exercise·Katrien KoppoWim Derave
Sep 24, 2005·Medicine and Science in Sports and Exercise·Bruno Grassi
Dec 4, 2003·Medicine and Science in Sports and Exercise·Andrew M JonesKatrien Koppo
Nov 12, 2005·Journal of Applied Physiology·Brad J BehnkeDavid C Poole
Oct 11, 2008·Journal of Applied Physiology·Kyle F HerspringTimothy I Musch
Aug 19, 2011·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Yutaka KanoOsamu Ezaki
Mar 5, 2011·Journal of Applied Physiology·Daniel M HiraiDavid C Poole
Jan 25, 2020·The Journal of Physiology·David C PooleTimothy I Musch
May 26, 2020·European Journal of Sport Science·Charalabos K KtenidisVassilis Paschalis
Dec 8, 2004·Journal of Applied Physiology·Brendon J GurdJohn M Kowalchuk
Aug 8, 2012·International Journal of Sports Physiology and Performance·Stephen A InghamAndrew M Jones
Oct 16, 2015·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Kohei YamakoshiYutaka Kano
Jan 15, 2014·American Journal of Physiology. Heart and Circulatory Physiology·Daniel M HiraiDavid C Poole

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