The purpose of this study was to examine the acute effects of a caffeine-containing supplement on upper- and lower-body strength and muscular endurance as well as anaerobic capabilities. Thirty-seven resistance-trained men (mean +/- SD, age: 21 +/- 2 years) volunteered to participate in this study. On the first laboratory visit, the subjects performed 2 Wingate Anaerobic Tests (WAnTs) to determine peak power (PP) and mean power (MP), as well as tests for 1 repetition maximum (1RM), dynamic constant external resistance strength, and muscular endurance (TOTV; total volume of weight lifted during an endurance test with 80% of the 1RM) on the bilateral leg extension (LE) and free-weight bench press (BP) exercises. Following a minimum of 48 hours of rest, the subjects returned to the laboratory for the second testing session and were randomly assigned to 1 of 2 groups: a supplement group (SUPP; n = 17), which ingested a caffeine-containing supplement, or a placebo group (PLAC; n = 20), which ingested a cellulose placebo. One hour after ingesting either the caffeine-containing supplement or the placebo, the subjects performed 2 WAnTs and were tested for 1RM strength and muscular endurance on the LE and BP exercises. The results indicated that there was a significant (p < 0.05) increase in BP 1RM for the SUPP group, but not for the PLAC group. The caffeine-containing supplement had no effect, however, on LE 1RM, LE TOTV, BP TOTV, PP, and MP. Thus, the caffeine-containing supplement may be an effective supplement for increasing upper-body strength and, therefore, could be useful for competitive and recreational athletes who perform resistance training.

译文

:这项研究的目的是检查含咖啡因的补充剂对上,下半身的力量,肌肉耐力以及无氧能力的急性作用。三十七名经过抗性训练的男性(平均/-SD,年龄:21 /-2岁)自愿参加了这项研究。在第一次实验室访问中,受试者进行了2次Wingate无氧测试(WAnT),以确定峰值功率(PP)和平均功率(MP),以及1次重复最大值(1RM),动态恒定的外部阻力强度和肌肉的测试耐力(TOTV;在耐力测试中以1RM的80%进行测试时提升的总重量)在双腿伸展(LE)和自由重量卧推(BP)锻炼中。至少休息48小时后,受试者返回实验室进行第二次测试,并随机分为2组中的1组:补充组(SUPP; n = 17),摄入含咖啡因的补充剂,或服用纤维素安慰剂的安慰剂组(PLAC; n = 20)。摄入含咖啡因的补充剂或安慰剂一小时后,受试者进行了2次WAnT,并在LE和BP锻炼中测试了1RM强度和肌肉耐力。结果表明SUPP组的BP 1RM显着增加(p <0.05),而PLAC组则没有。但是,含咖啡因的补充剂对LE 1RM,LE TOTV,BP TOTV,PP和MP无作用。因此,含咖啡因的补充剂可能是增加上半身力量的有效补充剂,因此对进行阻力训练的竞技和休闲运动员有用。

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