背景：目前研究對於活化後增能 (post activation potentiation, PAP)的最佳負重尚未有一致結果，有鑑於百分比訓練法無法準確反應訓練當下的疲勞程度，嘗試使用速度依循的模式，探討在相同速度流失 (velocity loss, VL)配合不同負重半蹲舉作為誘發PAP的運動介入，對反向跳躍 (countermovement jump, CMJ)能力的立即影響。方法：9位大專男子田徑校隊選手。共需參加3次實驗，第1次熟悉流程、測試半蹲舉單次最大負重 (one repetition maximum, 1RM)並建立個人速度負重曲線；第2次和第3次分別使用80%1RM以及90%1RM對應的目標速度操作3組半蹲舉，每組都在速度流失10%後結束；第3組半蹲舉結束後7分鐘執行CMJ後測，其前後測的變化將作為PAP效果評估。結果：80%1RM和90%1RM皆未在CMJ跳躍高度等數據得到顯著變化。但觀察到兩種高負荷在各組都出現最後一下半蹲舉速度驟降的情形，所以實際速度流失大幅超過原先設定的10%。結論：3組80%1RM和90%1RM半蹲舉，每組速度流失10%的訓練量無法誘發PAP。建議未來對於高負荷的研究可以使用不同的速度流失閾值或是在組數、休息時間做更彈性的安排。

Purpose: The optimal load intensity for post-activation potentiation (PAP) remains inconclusive in current research. Given that percentage-based training may not accurately reflect the fatigue level during training, this study aimed to investigate the immediate effects of PAP induced by half squat at different load intensities using a velocity-based approach with the same velocity loss (VL) criteria on countermovement jump (CMJ) performance. Methods: Nine collegiate male track and field athletes participated in this study and completed three experimental sessions. The first session familiarized the athletes with the procedures and determined their one repetition maximum (1RM) for half squat, establishing their load-velocity profile. In the second and third sessions, the athletes performed three sets of half squats at 80%1RM and 90%1RM, respectively, with the target velocity corresponding to 10%VL. Seven minutes after completing the third set of half squats, CMJ performance was assessed as the post-test for evaluating the PAP effect. Results：No significant differences were observed in CMJ height, rate of force development, modified reactive strength index, peak power, peak velocity and peak force between the 80%1RM and 90%1RM conditions. However, a substantial decrease in velocity occurred in the last repetition of each set in both high-load conditions, resulting in a VL exceeding the initially set criteria of 10%. Conclusion: Three sets of half squat at 80% 1RM and 90% 1RM with 10%VL do not induce PAP. Future research may consider using different VL or adjusting the number of sets and rest intervals to be more flexible while also considering the participants' physical condition and individual differences.

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