Oxygen Uptake Kinetics Is Slower in Swimming Than Arm Cranking and Cycling during Heavy Intensity.

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Serval ID
serval:BIB_A1A69F66127B
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Oxygen Uptake Kinetics Is Slower in Swimming Than Arm Cranking and Cycling during Heavy Intensity.
Journal
Frontiers in Physiology
Author(s)
Sousa A., Borrani F., Rodríguez F.A., Millet G.P.
ISSN
1664-042X (Online)
ISSN-L
1664-042X
Publication state
Published
Issued date
09/2017
Peer-reviewed
Oui
Volume
8
Pages
NA
Language
english
Notes
Article 639
Abstract
Oxygen uptake ([Formula: see text]) kinetics has been reported to be influenced by the activity mode. However, only few studies have compared [Formula: see text]O2 kinetics between activities in the same subjects in which they were equally trained. Therefore, this study compared the [Formula: see text]O2 kinetics response to swimming, arm cranking, and cycling within the same group of subjects within the heavy exercise intensity domain. Ten trained male triathletes (age 23.2 ± 4.5 years; height 180.8 ± 8.3 cm; weight 72.3 ± 6.6 kg) completed an incremental test to exhaustion and a 6-min heavy constant-load test in the three exercise modes in random order. Gas exchange was measured by a breath-by-breath analyzer and the on-transient [Formula: see text]O2 kinetics was modeled using bi-exponential functions. [Formula: see text]O2peak was higher in cycling (65.6 ± 4.0 ml·kg(-1)·min(-1)) than in arm cranking or swimming (48.7 ± 8.0 and 53.0 ± 6.7 ml·kg(-1)·min(-1); P < 0.01), but the [Formula: see text]O2 kinetics were slower in swimming (τ1 = 31.7 ± 6.2 s) than in arm cranking (19.3 ± 4.2 s; P = 0.001) and cycling (12.4 ± 3.7 s; P = 0.001). The amplitude of the primary component was lower in both arm cranking and swimming (21.9 ± 4.7 and 28.4 ± 5.1 ml·kg(-1)·min(-1)) compared with cycling (39.4 ± 4.1 ml·kg(-1)·min(-1); P = 0.001). Although the gain of the primary component was higher in arm cranking compared with cycling (15.3 ± 4.2 and 10.7 ± 1.3 ml·min(-1)·W(-1); P = 0.02), the slow component amplitude, in both absolute and relative terms, did not differ between exercise modes. The slower [Formula: see text]O2 kinetics during heavy-intensity swimming is exercise-mode dependent. Besides differences in muscle mass and greater type II muscle fibers recruitment, the horizontal position adopted and the involvement of trunk and lower-body stabilizing muscles could be additional mechanisms that explain the differences between exercise modalities.

Keywords
V̇O2 kinetics, exercise modes, gas exchange, modeling, triathletes
Pubmed
Web of science
Open Access
Yes
Create date
19/09/2017 10:09
Last modification date
20/08/2019 15:07
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