目的：探討缺血預處理 (ischemic preconditioning, IPC) 對Yo-Yo間歇恢復第一級 (Yo-Yo intermittent recovery level 1, Yo-Yo IR1) 測驗表現之影響。方法：招募12名大專男性甲組橄欖球選手，在實施Yo-Yo IR1測驗前，利用隨機分派及平衡次序方式，分別執行IPC (4 × 5-min 220 mmHg雙側大腿加壓)、偽處理 (SHAM, 4 × 5-min 20 mmHg雙側大腿加壓)，以及控制處理 (CON)。並記錄Yo-Yo IR1測驗過程中之完成趟數、完成距離、衰竭時間，以及監測攝氧量 (oxygen uptake, VO2)、攝氧峰值 (VO2peak)、心跳率上升趨勢 (heart rate/4i, HR/4i) 與運動強度自覺程度上升趨勢 (rating of perceived exertion/4i, RPE/4i) 等生理指標；利用近紅外線光譜儀監測整個實驗過程股四頭肌的肌肉氧飽和度。結果：IPC與SHAM之Yo-Yo IR1測驗表現皆顯著高於CON，包含完成距離 (IPC vs. SHAM vs. CON, 1813.3 ± 381.9 vs. 1793.3 ± 335.5 vs. 1680.0 ± 324.5 m) 與衰竭時間 (IPC vs. SHAM vs. CON, 886.5 ± 179.0 vs. 877.5 ± 157.5 vs. 823.9 ± 153.1 s)，而IPC與SHAM則無顯著差異。在Yo-Yo IR1測驗時，IPC與SHAM的RPE/4i顯著低於CON (IPC vs. SHAM vs. CON, 1.2 ± 0.3 vs. 1.1 ± 0.5 vs. 1.4 ± 0.4 au)，不過，在HR/4i、VO2peak、VO2等生理指標，以及肌肉氧飽和度指標，在三種實驗處理之間並無顯著差異。結論：大專橄欖球選手執行IPC (4 × 5-min雙側大腿) 可能提升Yo-Yo IR1運動表現，並降低運動過程中RPE，但仍無法完全排除安慰劑效應。

Purpose: To investigate the effect of ischemic preconditioning (IPC) on performance of Yo-Yo intermittent recovery level 1 (Yo-Yo IR1) test. Methods: In a randomized, counter-balanced study, 12 division I collegiate male rugby players performed Yo-Yo IR1 test, which were preceded by IPC (4 × 5-min 220 mmHg bilateral thighs occlusion), SHAM (4 × 5-min 20 mmHg bilateral thighs occlusion), or control (CON) treatments. The covered shuttles, distances, duration, oxygen uptake (VO2), peak oxygen uptake (VO2peak), heart rate/4i (HR/4i), and rating of perceived exertion/4i (RPE/4i) were measured during the Yo-Yo IR1 test. Changes in muscle oxygenation of quadriceps were continuously monitored by near-infrared spectroscopy throughout the trials. Results: The Yo-Yo IR1 test performances of IPC and SHAM were both significantly higher than CON, including covered distances (IPC vs. SHAM vs. CON, 1813.3 ± 381.9 vs. 1793.3 ± 335.5 vs. 1680.0 ± 324.5 m) and time to exhaustion (IPC vs. SHAM vs. CON, 886.5 ± 179.0 vs. 877.5 ± 157.5 vs. 823.9 ± 153.1 s). However, no significant differences were found betwwen IPC and SHAM. The RPE/4i of IPC and SHAM were both significantly lower than CON (IPC vs. SHAM vs. CON, 1.2 ± 0.3 vs. 1.1 ± 0.5 vs. 1.4 ± 0.4 au) in the Yo-Yo IR1 test. There were no significant differences in HR/4i, VO2peak, VO2, and changes in muscle oxygenation among three treatments. Conclusion: The usage of IPC (4 × 5-min bilateral thighs) in collegiate rugby players might enhance Yo-Yo IR1 test performance and reduce RPE during exerciese. However, placebo effect of IPC could not be entirely ruled out.

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