Physical Effort Laboratory, Sports Center, Federal University of Santa Catarina, Florianópolis, SC, Brazil.
Human Performance Research Group, Center for Health Sciences and Sport, Santa Catarina State University, Florianópolis, SC, Brazil.
Eur J Appl Physiol. 2018 Aug;118(8):1599-1607. doi: 10.1007/s00421-018-3891-2. Epub 2018 May 23.
Although ischaemic preconditioning (IPC), induced by cycles of transient limb ischaemia and reperfusion, seems to improve exercise performance, the optimal duration of ischaemia-reperfusion cycles is not established. The present study investigated the effect of ischaemia-reperfusion duration within each IPC cycle on performance in a 2000-m rowing ergometer test.
After incremental and familiarization tests, 16 trained rowers (mean ± SD: age, 24 ± 11 years; weight, 74.1 ± 5.9 kg; [Formula: see text] peak, 67.2 ± 7.4 mL·kg·min) were randomly submitted to a 2000-m rowing test preceded by intermittent bilateral cuff inflation of the lower limbs with three cycles of ischaemia-reperfusion, lasting 5 min (IPC-5) or 10 min (IPC-10) at 220 or 20 mmHg (control). Power output, [Formula: see text], heart rate, blood lactate concentration, pH, ratings of perceived exertion (RPE), and near-infrared spectroscopy-derived measurements of the vastus lateralis muscle were continuously recorded.
No differences among treatments were found in the 2000-m test (control: 424 ± 17; IPC-5: 425 ± 16; IPC-10: 424 ± 17 s; P = 0.772). IPC-10 reduced the tissue saturation index and oxy-haemoglobin concentration during exercise compared with control. The power output during the last 100-m segment was significantly lower with IPC-10. The IPC treatments increased the heart rate over the first 500 m and decreased the pH after exercise. No alterations were observed in [Formula: see text], blood lactate, or RPE among the trials.
In conclusion, IPC does not improve the 2000-m rowing ergometer performance of trained athletes regardless of the length of ischaemia-reperfusion cycles.
尽管缺血预处理（IPC）通过短暂肢体缺血和再灌注循环诱导，似乎可以提高运动表现，但缺血-再灌注循环的最佳持续时间尚未确定。本研究旨在探讨每个 IPC 周期内缺血-再灌注持续时间对 2000 米划船测功仪测试表现的影响。
在递增和熟悉测试后，16 名训练有素的划船运动员（平均年龄±标准差：24±11 岁；体重：74.1±5.9kg；[公式：见文本]峰值：67.2±7.4ml·kg·min）被随机分为三组，分别接受间歇性双侧肢体充气的 2000 米划船测试，充气持续时间为 5 分钟（IPC-5）或 10 分钟（IPC-10），充气压力为 220 或 20mmHg（对照组）。持续记录功率输出、[公式：见文本]、心率、血乳酸浓度、pH 值、感知用力等级（RPE）以及股外侧肌近红外光谱衍生测量值。
在 2000 米测试中，三种处理方式之间无差异（对照组：424±17s；IPC-5：425±16s；IPC-10：424±17s；P=0.772）。IPC-10 降低了运动期间组织饱和度指数和氧合血红蛋白浓度。与对照组相比，IPC-10 时最后 100m 段的功率输出显著降低。IPC 处理增加了前 500m 的心率，降低了运动后的 pH 值。三个试验组之间[公式：见文本]、血乳酸或 RPE 均无变化。
总之，无论缺血-再灌注循环的长度如何，IPC 都不能提高训练有素的运动员的 2000 米划船测功仪成绩。
