Oxygen uptake and heart rate kinetics during heavy exercise: a comparison between arm cranking and leg cycling

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Title Oxygen uptake and heart rate kinetics during heavy exercise: a comparison between arm cranking and leg cycling
Author Schneider, Donald Anthony; Wing, Andrew N.; Morris, Norman
Journal Name European Journal of Applied Physiology
Editor P.E. de Prampero
Year Published 2002
Place of publication Germany
Publisher Springer-Verlag
Abstract This study examined the oxygen uptake (V˙O2) and heart rate (HR) kinetics during arm cranking and leg cycling at work rates above the anaerobic threshold (AT). Ten untrained male subjects [21.6 (1.3) years] completed two 7 min 15 s constant-load arm cranking and two leg cycling tests at a power output halfway between the mode-specific AT and peak V˙O2. The time constants for phase II V˙O2 (τ) and HR (τ) kinetics were determined by fitting a monoexponential curve from the end of phase I until 3 min of exercise. V˙O2 τ and HR τ values were significantly (P<0.001) slower in arm cranking [V˙O2 τ = 66.4 (3.0) s; HR τ = 74.7 (4.4) s] than in leg cycling [V˙O2 τ = 42.0 (1.9) s; HR τ = 55.6 (3.5) s]. The V˙O2 slow component (V˙O2SC) accounted for a significantly (P<0.001) greater percentage of the total exercise response during arm cranking [23.8 (1.6)%] than during leg cycling [14.2 (1.5)%]. The greater relative V˙O2SC and the slower V˙O2 τ with arm exercise are consistent with a greater recruitment of metabolically inefficient type II muscle fibres during arm cranking than during leg cycling.
Peer Reviewed Yes
Published Yes
Alternative URI http://dx.doi.org/10.1007/s00421-002-0690-5
Volume 88
Page from 100
Page to 105
ISSN 1439-6319
Date Accessioned 2003-04-13
Date Available 2010-07-27T07:15:04Z
Language en_AU
Research Centre Griffith Health Institute; Heart Foundation Research Centre
Faculty Faculty of Nursing & Health
Subject PRE2009-Exercise Physiology
URI http://hdl.handle.net/10072/6918
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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