Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5872867 | Journal of Science and Medicine in Sport | 2015 | 5 Pages |
ObjectivesTo investigate the effect of water immersion on oxygen uptake (VËO2) and central hemodynamic responses during incremental maximal exercise at the same external power output (Pext) and recovery on an immersible ergocycle vs. a dryland ergocycle.DesignCross-over design study.MethodsTwenty healthy participants (32 ± 7 years; 173 ± 6 cm; 71.7 ± 9.7 kg) performed maximal incremental exercise tests while pedalling either immersed on immersible ergocycle (Hydrorider®) or on dryland ergocycle (Ergoline 800S; Bitz, Germany). Initial Pext of dryland ergocycle protocol was set at 25 W and increased by 25 W every minute until exhaustion. Pext on immersible ergocycle was controlled by pedalling rate (rpm). Initial rpm was set at 40 rpm and was increased by 10 rpm until 70 rpm and thereafter by 5 rpm until exhaustion. Gas exchange and central hemodynamic parameters were measured continuously during exercise and a 5-min recovery period. Reported VËO2, stroke volume, cardiac output (QË) and arteriovenous difference (C(a-v)O2) were compared.ResultsDuring exercise on immersible ergocycle, VËO2 and C(a-v)O2 were lower (P < 0.0001) whereas stroke volume and QË were higher (P < 0.05) relative to a dryland ergocycle exercise of equivalent Pext.ConclusionsDuring exercise and recovery in immersion, (VËO2) and arteriovenous difference were reduced in healthy young participants, while stroke volume and cardiac output were increased for the same Pext. During the recovery, central hemodynamics responses remained higher in immersible ergocycle.