Blood flow and muscle oxygen uptake at the onset and end of moderate and heavy dynamic forearm exercise.

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Title:	Blood flow and muscle oxygen uptake at the onset and end of moderate and heavy dynamic forearm exercise.
Author(s):	Beekvelt, M.C.P. van; Shoemaker, J.K.; Tschakovsky, M.E.; Hopman, M.T.E. ; Hughson, R.L.
Publication year:	2001
Source:	American Journal of Physiology : Regulatory Integrative and Comparative Physiology, vol. 280, iss. 6, (2001), pp. R174-7
ISSN:	0363-6119
Related links:	http://ajpregu.physiology.org/cgi/content/abstract/280/6/R1741
DOI:	https://doi.org/10.1152/ajpregu.2001.280.1.R174
Publication type:	Article / Letter to editor
Please use this identifier to cite or link to this item : http://hdl.handle.net/2066/141689
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Subject:	Bloodpressure regulation, tissue oxygenation and exercise Neuromuscular and neurometabolic disorders Bloeddrukregulatie, weefseloxygenatie en inspanning Neuromusculaire en neurometabole aandoeningen
Organization:	Neurology Physiology
Journal title:	American Journal of Physiology : Regulatory Integrative and Comparative Physiology
Volume:	vol. 280
Issue:	iss. 6
Page start:	p. R174
Page end:	p. 7
Abstract:	We hypothesized that forearm blood flow (FBF) during moderate intensity dynamic exercise would meet the demands of the exercise and that postexercise FBF would quickly recover. In contrast, during heavy exercise, FBF would be inadequate causing a marked postexercise hyperemia and sustained increase in muscle oxygen uptake (VO(2musc)). Six subjects did forearm exercise (1-s contraction/relaxation, 1-s pause) for 5 min at 25 and 75% of peak workload. FBF was determined by Doppler ultrasound, and O(2) extraction was estimated from venous blood samples. In moderate exercise, FBF and VO(2musc) increased within 2 min to steady state. Rapid recovery to baseline suggested adequate O(2) supply during moderate exercise. In contrast, FBF was not adequate during heavy dynamic exercise. Immediately postexercise, there was an approximately 50% increase in FBF. Furthermore, we observed for the first time in the recovery period an increase in VO(2musc) above end-exercise values. During moderate exercise, O(2) supply met requirements, but with heavy forearm exercise, inadequate O(2) supply during exercise caused accumulation of a large O(2) deficit that was repaid during recovery.