Different V˙O2max Time-Averaging Intervals in Swimming.

Centre of Research, Education, Innovation and Intervention in Sport, Faculty of Sport, University of Porto, Portugal.
International Journal of Sports Medicine (Impact Factor: 2.37). 07/2012; 33(12). DOI: 10.1055/s-0032-1316362
Source: PubMed

ABSTRACT We aimed to determine the effect of sampling interval strategy on V˙O2max assessment to establish a standard time averaging method that allows a better identification of the V˙O2 plateau incidence in swimming. To this end, 3 incremental protocols utilizing different step lengths for each sampling interval were used to compare V˙O2max measurements. 11 trained male swimmers performed 3 repetitions of a front crawl intermittent incremental protocol until exhaustion (increments of 0.05 m.s - 1, with 30 s and 24-48 h intervals between steps and tests, respectively) with 200, 300 and 400-m step lengths. V˙O2 was directly measured, and 6 sampling intervals were compared: bxb and averages of 5, 10, 15, 20 and 30 s. Shorter sampling intervals (≤15 s) allowed the highest incidence of the V˙O2 plateau, independent of the step lengths used; the 200 and 300-m step protocols accounted for higher percentage of V˙O2 plateau incidence, and higher V˙O2max values, compared to the 400-m step protocol. As an optimal sampling interval should be used for the validation of the research findings, and considering that swimmers and coaches prefer less time-consuming protocols, the use of the 10 s time-average interval (once bxb and 5 s samplings present high variability) in a 200-m step incremental protocol for V˙O2max assessment in swimming is suggested.

Download full-text


Available from: Laura Guidetti, Jul 02, 2015
1 Follower
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: To estimate the anaerobic alactic contribution in a 200 m middle distance swimming trial by means of two different methods based: (1) on the fast component of the [Formula: see text] off-kinetics (Anarecovery) and (2) on the kinetics of maximal phosphocreatine splitting in the contracting muscle (Anapcr). Ten elite male swimmers performed a 200 m front crawl trial at maximal velocity during which [Formula: see text]was directly measured using a telemetric portable gas analyser; during the recovery period [Formula: see text] data were collected until baseline values were reached. No significant differences between the two methods were observed; mean ± SD values were 31.7 ± 2.5 and 32.6 ± 2.8 kJ, for Anapcr and Anarecovery, respectively. Despite the existence of some caveats regarding both methods for estimation of the anaerobic alactic contribution, data reported in this study indicate that both yield similar results and both allow to estimate this contribution in supra-maximal swimming trials. This has important implications on swimming energetics, since the non-inclusion of the anaerobic alactic contribution to total metabolic energy expenditure leads to an underestimation of the energy cost at supra-maximal speeds.
    Arbeitsphysiologie 04/2013; 113(8). DOI:10.1007/s00421-013-2646-3
  • Source
    The Open Sports Sciences Journal 01/2013; 6(Epub ahead of print).
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: The aim of this study was to present a review on the time to exhaustion at the minimum swimming velocity corresponding to maximal oxygen consumption (TLim-vVO2max). This parameter is critical both for the aerobic power and the lactate tolerance bioenergetical training intensity zones, being fundamental to characterize it, and to point out its main determinants. The few number of studies conducted in this topic observed that swimmers were able to maintain an exercise intensity corresponding to maximal aerobic power during 215 to 260 s (elite swimmers), 230 to 260 s (high level swimmers) and 310 to 325 s (low level swimmers), and no differences between genders were reported. TLim-vVO2max main bioenergetic and functional determinants were swimming economy and VO2 slow component (direct relationship), and vVO2max, velocity at anaerobic threshold and blood lactate production (inverse relationship); when more homogeneous groups of swimmers were analysed, the inverse correlation value between TLim-vVO2max and vVO2max was not so evident. In general, TLim-vVO2max was not related to VO2max. TLim-vVO2max seems also to be influenced by stroking parameters, with a direct relationship to stroke length and stroke index, and an inverse correlation with stroke rate. Assessing TLim-vVO2max, together with the anaerobic threshold and the biomechanical general parameters, will allow a larger spectrum of testing protocols application, helping to build more objective and efficient training programs.
    Journal of Human Kinetics 05/2012; 32:121-34. DOI:10.2478/v10078-012-0029-1