Cardiorespiratory response in swimming has been used to better understand aerobic performance, especially by assessing oxygen uptake (VO2). The current study aimed to compare different VO2 time-averaging intervals throughout low to severe swimming intensities, hypothesizing that VO2 values are similar for different time-averages at low-moderate and heavy swimming intensities, but not for the severe domain. Twenty male trained swimmers completed an incremental protocol of 7x200 m until exhaustion (0.05m/s increments and 30s intervals). VO2 was measured by a portable gas analyser connected to a snorkel system. Six time-average intervals (breath-by-breath 5, 10, 15, 20 and 30 s) were compared for all the protocol steps. Breath-by-breath and 5 s average exhibited higher VO2 values than averages ≥10 s for all swimming intensities (P≤0.02; partial η2≤0.28). VO2 values did not differed between 10, 15, 20 and 30 s averages throughout the incremental protocol (P>0.05; partial η2≤0.05). Furthermore, 10 and 15 s averages showed the lowest VO2 mean difference (0.19 mL.kg¯¹.min¯¹). For the six timeaverage intervals analysed, 10 and 15 s averages were those that showed the lowest changes on VO2 values. We recommended the use of 10 and 15 s time-averaging intervals to determine relevant respiratory gas exchange parameters along a large spectrum of swimming intensities.
|Titolo:||Which are the best VO2 sampling intervals to characterize low to severe swimming?|
BALDARI, CARLO (Corresponding)
|Data di pubblicazione:||2014|
|Appare nelle tipologie:||1.1 Articolo in rivista|