Winchcombe Chelsie E, Binnie Martyn J, Doyle Matthew M, Hogan Cruz, Peeling Peter
Int J Sports Physiol Perform. 2019 Oct 1;14(9):1244-1249. doi: 10.1123/ijspp.2018-0717.
To determine the reliability and validity of a power-prescribed on-water (OW) graded exercise test (GXT) for flat-water sprint kayak athletes.
Nine well-trained sprint kayak athletes performed 3 GXTs in a repeated-measures design. The initial GXT was performed on a stationary kayak ergometer in the laboratory (LAB). The subsequent 2 GXTs were performed OW (OW1 and OW2) in an individual kayak. Power output (PWR), stroke rate, blood lactate, heart rate, oxygen consumption, and rating of perceived exertion were measured throughout each test.
Both PWR and oxygen consumption showed excellent test-retest reliability between OW1 and OW2 for all 7 stages (intraclass correlation coefficient > .90). The mean results from the 2 OW GXTs (OWAVE) were then compared with LAB, and no differences in oxygen consumption across stages were evident (P ≥ .159). PWR was higher for OWAVE than for LAB in all stages (P ≤ .021) except stage 7 (P = .070). Conversely, stroke rate was lower for OWAVE than for LAB in all stages (P < .010) except stage 2 (P = .120).
The OW GXT appears to be a reliable test in well-trained sprint kayak athletes. Given the differences in PWR and stroke rate between the LAB and OW tests, an OW GXT may provide more specific outcomes for OW training.
确定针对静水冲刺皮划艇运动员的功率规定水上（OW）分级运动试验（GXT）的可靠性和有效性。
9名训练有素的冲刺皮划艇运动员采用重复测量设计进行了3次GXT。最初的GXT在实验室（LAB）的固定皮划艇测力计上进行。随后的2次GXT在个人皮划艇上进行OW（OW1和OW2）测试。在每次测试过程中测量功率输出（PWR）、划桨频率、血乳酸、心率、耗氧量和主观用力程度评级。
对于所有7个阶段，OW1和OW2之间的PWR和耗氧量均显示出出色的重测可靠性（组内相关系数>.90）。然后将2次OW GXT（OWAVE）的平均结果与LAB进行比较，各阶段的耗氧量没有明显差异（P≥.159）。除第7阶段（P =.070）外，OWAVE在所有阶段的PWR均高于LAB（P≤.021）。相反，除第2阶段（P =.120）外，OWAVE在所有阶段的划桨频率均低于LAB（P <.010）。
OW GXT似乎是训练有素的冲刺皮划艇运动员的可靠测试。鉴于LAB和OW测试之间PWR和划桨频率存在差异，OW GXT可能为OW训练提供更具体的结果。
