Int J Sports Physiol Perform. 2020 Apr 25;15(10):1406-1413. doi: 10.1123/ijspp.2019-0847.
To investigate the effects of acute caffeine (CAFF) intake on physical performance in elite women handball players.
A total of 15 elite women handball players participated in a randomized, double-blind study. In 2 different trials, participants ingested either a placebo (cellulose) or 3 mg of CAFF per kilogram of body mass (mg/kg bm) before undergoing a battery of neuromuscular tests consisting of handball throws, an isometric handgrip strength test, a countermovement jump, a 30-m sprint test (SV) and a modified version of the agility T test. Then, participants performed a simulated handball game (2 × 20 min), and movement patterns were recorded with a local positioning system.
Compared with the placebo, CAFF increased ball velocity in all ball throws (P = .021-.044; effect size [ES] = 0.39-0.49), strength in isometric handgrip strength test (350.8 [41.2] vs 361.6 [46.1] N, P = .034; ES = 0.35), and countermovement-jump height (28.5 [5.5] vs 29.8 [5.5] cm; P = .006; ES = 0.22). In addition, CAFF decreased running time in the SV (4.9 [0.2] vs 4.8 [0.3] s; P = .042; ES = -0.34). In the simulated game, CAFF increased the frequency of accelerations (18.1 [1.2] vs 18.8 [1.0] number/min; P = .044; ES = 0.54), decelerations (18.0 [1.2] vs 18.7 [1.0] number/min; P = .032; ES = 0.56), and body impacts (20 [8] vs 22 [10] impacts/min; P = .032; ES = 0.30). However, postexercise surveys about self-reported feelings of performance indicate that players did not feel increased performance with CAFF.
Preexercise ingestion of 3 mg/kg bm of CAFF improved ball-throwing velocity, jump, and sprint performance and the frequency of in-game accelerations and decelerations in elite women handball players.
研究急性咖啡因（CAFF）摄入对女子手球精英运动员身体表现的影响。
共有 15 名女子手球精英运动员参与了这项随机、双盲研究。在 2 个不同的试验中，参与者分别在摄入安慰剂（纤维素）或 3mg/kg 体重的 CAFF 后，接受了一系列神经肌肉测试，包括手球投掷、等长握力测试、反跳、30 米冲刺测试（SV）和改良敏捷 T 测试。然后，参与者进行了一场模拟手球比赛（2×20 分钟），并使用局部定位系统记录运动模式。
与安慰剂相比，CAFF 增加了所有手球投掷的球速（P=0.021-0.044；效应大小[ES]=0.39-0.49）、等长握力测试的力量（350.8[41.2]与 361.6[46.1]N，P=0.034；ES=0.35）和反跳高度（28.5[5.5]与 29.8[5.5]cm；P=0.006；ES=0.22）。此外，CAFF 还缩短了 SV 中的跑步时间（4.9[0.2]与 4.8[0.3]s；P=0.042；ES=-0.34）。在模拟比赛中，CAFF 增加了加速次数（18.1[1.2]与 18.8[1.0]次/分钟；P=0.044；ES=0.54）、减速次数（18.0[1.2]与 18.7[1.0]次/分钟；P=0.032；ES=0.56）和身体撞击次数（20[8]与 22[10]次/分钟；P=0.032；ES=0.30）。然而，赛后关于自我报告的表现感觉的调查表明，运动员并没有感觉到 CAFF 带来的表现提高。
运动前摄入 3mg/kg 体重的 CAFF 可提高女子手球精英运动员的球速、跳跃和冲刺表现，以及比赛中加速和减速的频率。
