Case Study: Dose Response of Caffeine on 20-km Handcycling Time Trial Performance in a Paratriathlete
Case Study: Dose Response of Caffeine on 20-km Handcycling Time Trial Performance in a Paratriathlete
复制标题
DOI：
10.1123/ijsnem.2017-0089
复制
发表时间：
2018-05-01
影响因子：
2.5
通讯作者：
Goosey-Tolfrey, Victoria
中科院分区：
文献类型：
--
作者：
Graham-Paulson, Terri;Perret, Claudio;Goosey-Tolfrey, Victoria
咖啡因（CAF）影响上半身运动耐力表现的能力可能与个人的训练状态有关。因此，本病例研究旨在研究CAF剂量对优秀男性准三项全能运动员（轮椅使用者;年龄= 46岁，体重= 76.9 kg，体脂= 25.4%，手动自行车[峰值摄氧量，V（过点）O-2 peak] = 3.45 L/min）20公里计时赛（TT）表现的致能作用。运动员完成了四个20公里的手动自行车TT的Cyclus II测力计在受控的实验室条件下摄入2，4，和6毫克/公斤的CAF或安慰剂（PLA）。记录血乳酸浓度、功率输出、觉醒和主观用力等级。摄入2、4和6 mg/kg CAF导致TT比PLA快2%、1.5%和2.7%（37：40 min：s）。参与者的血乳酸浓度在所有试验中增加，并且在CAF期间比PLA期间更大。尽管不同的表演时间，但试验之间的主观努力评分没有明显差异。PLA和4 mg/kg CAF（1 =低）以及2和6 mg/kg CAF（3 =中度）之间的基线唤醒评分不同。在摄入4和6 mg/kg CAF后的每个时间点，唤醒增加。最大的CAF剂量导致了积极的起搏策略，当与末次冲刺相结合时，导致了最快的TT。CAF改善了优秀男性准三项全能运动员的20公里TT表现，这可能与更大的唤醒和增加的功率输出有关，对于给定的感知用力等级。
Caffeine's (CAF) ability to influence upper-body exercise endurance performance may be related to an individual's training status. This case study therefore aimed to investigate the ergogenic effects of CAF dose on 20-km time trial (TT) performance of an elite male paratriathlete (wheelchair user; age = 46 years, body mass = 76.9 kg, body fat = 25.4%, and handcycling [peak oxygen uptake, V(over dot)O-2peak] = 3.45 L/min). The athlete completed four 20-km handcycling TTs on a Cyclus II ergometer under controlled laboratory conditions following the ingestion of 2, 4, and 6 mg/kg CAF or placebo (PLA). Blood lactate concentration, power output, arousal, and ratings of perceived exertion were recorded. Ingestion of 2, 4, and 6 mg/kg CAF resulted in a 2%, 1.5%, and 2.7% faster TT compared with PLA (37: 40 min: s). The participant's blood lactate concentration increased throughout all trials and was greater during CAF compared with PLA. There were no obvious differences in ratings of perceived exertion between trials despite different performance times. Baseline arousal scores differed between PLA and 4mg/kg CAF (1 = low), and 2 and 6 mg/kg CAF (3 = moderate). Arousal increased at each time point following the ingestion of 4 and 6 mg/kg CAF. The largest CAF dose resulted in a positive pacing strategy, which, when combined with an end spurt, resulted in the fastest TT. CAF improved 20-km TT performance of an elite male paratriathlete, which may be related to greater arousal and an increased power output for a given rating of perceived exertion.