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首页> 外文期刊>Journal of Nursing Education and Practice >Caffeine bars used as pre-exercise supplements influence endurance performance, energy metabolism and perception of effort in trained cyclists
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Caffeine bars used as pre-exercise supplements influence endurance performance, energy metabolism and perception of effort in trained cyclists

机译：用作锻炼前补充的咖啡因酒吧影响耐力性能，能源代谢和培训的骑自行车者的努力的看法

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Background: In contrast to caffeine bars, the effect of caffeine intake from tablets and energy drinks on endurance performance has already been investigated. Therefore, the aim of the study is to examine the effects of caffeine bars used as pre-exercise supplements on endurance performance in cycling. Methods: The present study was designed as a randomized single-blind cross-over placebo-controlled trial. Nine male, trained cyclists completed endurance exercises on a cycling ergometer under the following conditions: ingestion of water (WAT), placebo bars (PLA) and caffeine bars (CAF; 5 mg caffeine/kg bodyweight), respectively, 45 min prior to the test. After 40 min at a constant intensity of 75% VO2max (assessed in a previously performed incremental test) load was increased 10 W/min until exhaustion. Results: CAF compared to PLA resulted in a higher maximal power and longer time to exhaustion (p = .002). Surprisingly, concentration of free fatty acids was lower at exhaustion (p = .004), whereas blood lactate levels (p = .021) and heart rate (p = .008) were significantly higher after CAF. Subjects also reported lower received perception of effort at warm-up (0.034), 30 min (p = .026) and 40 min (p = .041) only after CAF. Conclusions: Caffeine bars are useful pre-exercise supplements. Their performance enhancing effect was rather due to a delayed perception of fatigue than an increased lipolysis, proving caffeine as central nervous system stimulant.
机译：背景：与咖啡因酒吧形成鲜明对比，已经研究了咖啡因摄入量和能量饮料对耐力性能的影响。因此，研究的目的是检查咖啡因棒用作循环耐耐保障性能的锻炼补充剂的影响。方法：本研究设计为随机单盲交叉安慰剂对照试验。在下列条件下，九人训练的骑自行车的人完成了在循环中测力计上的耐力锻炼：摄入水（Wat），安慰剂棒（PLA）和咖啡因条（CAF; 5毫克咖啡因/千体重），在此之前45分钟测试。在40分钟以75％VO2Max的恒定强度（在先前进行的增量试验中评估）载荷增加10W / min直至耗尽。结果：CAF与PLA相比，最大功率和较长时间耗尽较高（P = .002）。令人惊讶的是，排气时，游离脂肪酸的浓度较低（p = .004），而CAF后血液乳酸水平（p = .021）和心率（p = .008）显着高。受试者还报告了在CAF之后仅在预热（0.034），30分钟（P = .026）和40分钟（P = .041）时的努力的感知。结论：咖啡因酒吧是有用的运动预补充剂。它们的性能增强效果是相当造成的，因为对脂肪的疲劳感到延迟看起来比增加的脂解，证明咖啡因作为中枢神经系统兴奋剂。

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