NDLI: Do interindividual differences in cardiac output during submaximal exercise explain differences in exercising muscle oxygenation and ratings of perceived exertion?

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Do interindividual differences in cardiac output during submaximal exercise explain differences in exercising muscle oxygenation and ratings of perceived exertion?

Content Provider	Scilit
Author	Bentley, Robert F. Jones, Joshua H. Hirai, Daniel M. Zelt, Joel T. Giles, Matthew D. Raleigh, James P. Quadrilatero, Joe Gurd, Brendon J. Neder, J. Alberto Tschakovsky, Michael E.
Copyright Year	2018
Description	Journal: Physiological reports
Abstract	Considerable interindividual differences in the $Q˙-V˙O2 relationship during exercise have been documented but implications for submaximal exercise tolerance have not been considered. We tested the hypothesis that these interindividual differences were associated with differences in exercising muscle deoxygenation and ratings of perceived exertion (RPE) across a range of submaximal exercise intensities. A total of 31 (21 \pm 3 years) healthy recreationally active males performed an incremental exercise test to exhaustion 24 h following a resting muscle biopsy. Cardiac output (Q˙ L/min; inert gas rebreathe), oxygen uptake (V˙O2 L/min; breath-by-breath pulmonary gas exchange), quadriceps saturation (near infrared spectroscopy) and exercise tolerance (6-20; Borg Scale RPE) were measured. TheQ˙-V˙O2 relationship from 40 to 160 W was used to partition individuals post hoc into higher (n = 10; 6.3 \pm 0.4) versus lower (n = 10; 3.7 \pm 0.4, P < 0.001) responders. TheQ˙-V˙O2 difference between responder types was not explained by arterial oxygen content differences (P = 0.5) or peripheral skeletal muscle characteristics (P from 0.1 to 0.8) but was strongly associated with stroke volume (P < 0.05). Despite considerable$
Related Links	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5789726/pdf
e-ISSN	2051817X
DOI	10.14814/phy2.13570
Journal	Physiological reports
Issue Number	2
Volume Number	6
Language	English
Publisher	Wiley-Blackwell
Publisher Date	2018-01-25
Access Restriction	Open
Subject Keyword	Journal: Physiological reports Cardiac Output Exercise Tolerance Interindividual Differences Ratings of Perceived Exertion
Content Type	Text
Resource Type	Article

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