Abstract
1. The cardiovascular responses to sustained contractions at tensions from 5 to 30% maximal voluntary contraction (MVC) have been examined. At 5 and 10% MVC blood pressure, heart rate and forearm blood flow all reached a steady state during the contraction; post-exercise hyperaemia did not show peak flows higher than those found during exercise. At tensions of 20 and 30% MVC, none of the measurements showed a steady state during the contractions, but increased steadily throughout the contraction; post-exercise hyperaemia characteristically showed peak flows in excess of any flow measured during contractions. The results obtained at a tension of 15% MVC did not show a steady-state during the contraction but the following hyperaemia showed a similar pattern to that seen at the lower tensions.
2. Digital compression of the brachial artery after sustained handgrip contractions for periods of 3 or 6 min after the contraction ended resulted in only a small reduction, on average by 5-15%, of the post-exercise hyperaemia.
3. Consideration of the evidence leads to the view that in physiological circumstances the post-exercise hyperaemia following sustained contractions bears a close relationship to the metabolism of the active muscles.
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- BARCROFT H., GREENWOOD B., WHELAN R. F. BLOOD FLOW AND VENOUS OXYGEN SATURATION DURING SUSTAINED CONTRACTION OF THE FOREARM MUSCLES. J Physiol. 1963 Oct;168:848–856. doi: 10.1113/jphysiol.1963.sp007226. [DOI] [PMC free article] [PubMed] [Google Scholar]
- BLAIR D. A., GLOVER W. E., RODDIE I. C. The abolition of reactive and post-exercise hyperaemia in the forearm by temporary restriction of arterial inflow. J Physiol. 1959 Oct;148:648–658. doi: 10.1113/jphysiol.1959.sp006313. [DOI] [PMC free article] [PubMed] [Google Scholar]
- CLARKE R. S., HELLON R. F. Hyperaemia following sustained and rhythmic exercise in the human forearm at various temperatures. J Physiol. 1959 Mar 12;145(3):447–458. doi: 10.1113/jphysiol.1959.sp006153. [DOI] [PMC free article] [PubMed] [Google Scholar]
- CLARKE R. S., HELLON R. F., LIND A. R. The duration of sustained contractions of the human forearm at different muscle temperatures. J Physiol. 1958 Oct 31;143(3):454–473. doi: 10.1113/jphysiol.1958.sp006071. [DOI] [PMC free article] [PubMed] [Google Scholar]
- DORNHORST A. C., WHELAN R. F. The blood flow in muscle following exercise and circulatory arrest; the influence of reduction in effective local blood pressure, of arterial hypoxia and of adrenaline. Clin Sci. 1953 Feb;12(1):33–40. [PubMed] [Google Scholar]
- Gaskell W H. The Changes of the Blood-stream in Muscles through Stimulation of their Nerves. J Anat Physiol. 1877 Apr;11(Pt 3):360–402.3. [PMC free article] [PubMed] [Google Scholar]
- HILTON S. M. Experiments on the post contraction hyperaemia of skeletal muscle. J Physiol. 1953 Apr 28;120(1-2):230–245. doi: 10.1113/jphysiol.1953.sp004888. [DOI] [PMC free article] [PubMed] [Google Scholar]
- HOLLING H. E., VEREL D. Circulation in the elevated forearm. Clin Sci. 1957 May;16(2):197–213. [PubMed] [Google Scholar]
- HUMPHREYS P. W., LIND A. R. The blood flow through active and inactive muscles of the forearm during sustained hand-grip contractions. J Physiol. 1963 Apr;166:120–135. doi: 10.1113/jphysiol.1963.sp007094. [DOI] [PMC free article] [PubMed] [Google Scholar]
- LIND A. R., TAYLOR S. H., HUMPHREYS P. W., KENNELLY B. M., DONALD K. W. THE CIRCULATIORY EFFECTS OF SUSTAINED VOLUNTARY MUSCLE CONTRACTION. Clin Sci. 1964 Oct;27:229–244. [PubMed] [Google Scholar]
- MCARDLE B., VEREL D. Responses to ischaemic work in the human forearm. Clin Sci. 1956 May;15(2):305–318. [PubMed] [Google Scholar]
- ROHMERT W. [Determination of the recovery pause for static work of man]. Int Z Angew Physiol. 1960;18:123–164. [PubMed] [Google Scholar]
- WHITNEY R. J. The measurement of volume changes in human limbs. J Physiol. 1953 Jul;121(1):1–27. doi: 10.1113/jphysiol.1953.sp004926. [DOI] [PMC free article] [PubMed] [Google Scholar]