Water Treadmill Parameters Needed to Obtain Land Treadmill Intensities in Runners

• Autores: Rachel K. Rife, Joseph William Myrer, Pat R. Vehrs, Jeffery Brent Feland, Iain Hunter
• Localización: Medicine & Science in Sports & exercise: Official Journal of the American College of Sports Medicine, ISSN 0195-9131, Vol. 42, Nº. 4, 2010, págs. 733-738
• Idioma: inglés
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• Resumen

  • Purpose: To establish water treadmill running parameters with shoes (WTR-S) and without water shoes (WTR-NS) needed to obtain known land treadmill running (LTR) cardiorespiratory responses.

    Methods: Eighteen trained college-aged runners participated in three running conditions (LTR, WTR-S, and WTR-NS) where cardiorespiratory responses were measured. The primary variables of interest were V[spacing dot above]O2, HR, treadmill speed, and stride frequency (SF). These variables were assessed at 50%, 60%, 70%, and 80% equivalents of land V[spacing dot above]O2max for all three running conditions.

    Results: Data were centered; so in the analysis, intercepts were calculated within the range of data. At an HR of 150 bpm, V[spacing dot above]O2 was significantly less (P < 0.05) during LTR (34.6 mL[middle dot]kg-1[middle dot]min-1) compared with WTR-S (37.5 mL[middle dot]kg-1[middle dot]min-1) and WTR-NS (37.2 mL[middle dot]kg-1[middle dot]min-1). HR was approximately 7 bpm less during WTR compared with LTR, although the metabolic demand (V[spacing dot above]O2) was similar. At a treadmill speed of 160.9 m[middle dot]min-1, SF during LTR was 23.6 strides per minute greater (P < 0.05) than that during WTR-S and 21.8 strides per minute greater than that during WTR-NS. Wearing water shoes increased V[spacing dot above]O2 by 4.12 mL[middle dot]kg-1[middle dot]min-1 at any given water treadmill speed.

    Conclusions: To achieve metabolic oxygen demands equivalent to intensities from 50% to 80% of V[spacing dot above]O2max on LTR, WTR parameters have to be changed from those used on LTR. WTR is an effective alternative to LTR. Subjects were able to exercise on the water treadmill at intensities equivalent to 80% of their V[spacing dot above]O2max and 55% to 94% of their land HRmax. Individuals can select a treadmill speed during WTR that elicits an HR of approximately 7 bpm less than their LTR to obtain a cardiorespiratory overload equivalent to 50%, 60%, 70%, and 80% of their land V[spacing dot above]O2max.