Department of Exercise Sciences, Brigham Young University, Provo, UT 84602, USA.
Med Sci Sports Exerc. 2010 Apr;42(4):733-8. doi: 10.1249/MSS.0b013e3181bdc485.
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.
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 VO2, HR, treadmill speed, and stride frequency (SF). These variables were assessed at 50%, 60%, 70%, and 80% equivalents of land VO2max for all three running conditions.
Data were centered; so in the analysis, intercepts were calculated within the range of data. At an HR of 150 bpm, VO2 was significantly less (P < 0.05) during LTR (34.6 mL·kg(-1)·min(-1)) compared with WTR-S (37.5 mL·kg(-1)·min(-1)) and WTR-NS (37.2 mL·kg(-1)·min(-1)). HR was approximately 7 bpm less during WTR compared with LTR, although the metabolic demand (VO2) was similar. At a treadmill speed of 160.9 m·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 VO2 by 4.12 mL·kg(-1)·min(-1) at any given water treadmill speed.
To achieve metabolic oxygen demands equivalent to intensities from 50% to 80% of VO2max 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 VO2max 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 VO2max.
建立穿着水鞋（WTR-S）和不穿水鞋（WTR-NS）在水上跑步机跑步的参数，以获得已知的陆地跑步机跑步（LTR）的心肺反应。
18 名训练有素的大学生跑步者参与了三种跑步条件（LTR、WTR-S 和 WTR-NS），在这些条件下测量心肺反应。主要感兴趣的变量是 VO2、HR、跑步机速度和步频（SF）。在所有三种跑步条件下，这些变量都在相当于陆地 VO2max 的 50%、60%、70%和 80%时进行评估。
数据已经中心化；因此，在分析中，在数据范围内计算了截距。在 HR 为 150 bpm 时，LTR（34.6 mL·kg(-1)·min(-1)）时的 VO2 明显低于 WTR-S（37.5 mL·kg(-1)·min(-1)）和 WTR-NS（37.2 mL·kg(-1)·min(-1)）。与 LTR 相比，WTR 时的 HR 约低 7 bpm，尽管代谢需求（VO2）相似。在 160.9 m·min(-1)的跑步机速度下，LTR 时的 SF 每分钟比 WTR-S 高 23.6 步（P < 0.05），比 WTR-NS 高 21.8 步。在任何给定的水上跑步机速度下，穿着水鞋都会使 VO2 增加 4.12 mL·kg(-1)·min(-1)。
为了在 LTR 上达到相当于 50%至 80% VO2max 强度的代谢氧气需求，WTR 参数必须与 LTR 上使用的参数不同。WTR 是 LTR 的有效替代方案。受试者可以在水上跑步机上以相当于其 VO2max 的 80%和陆地 HRmax 的 55%至 94%的强度进行运动。个人可以选择在 WTR 时使用的跑步机速度，使 HR 比 LTR 低约 7 bpm，以获得相当于 50%、60%、70%和 80%陆地 VO2max 的心肺过载。
