Yarrow Joshua F, Borsa Paul A, Borst Stephen E, Sitren Harry S, Stevens Bruce R, White Lesley J
University of Florida, Department of Applied Physiology & Kinesiology, Center for Exercise Science, Gainesville, FL 32611-8206, USA.
Med Sci Sports Exerc. 2007 Jun;39(6):941-7. doi: 10.1097/mss.0b013e318043a249.
The purpose of this study was to compare the total testosterone (TT), bioavailable testosterone (BT), growth hormone (GH), lactate, and ratings of perceived exertion (RPE) responses between a single bout of traditional (TRAD) and eccentric-enhanced resistance exercise (ECC+) of matched training volumes.
Twenty-two previously untrained males (21.9+/-0.8 yr) completed one familiarization and one baseline 1RM testing bout, for the bench press and squat exercises, and then two exercise bouts. During exercise bout 1, all subjects completed a TRAD protocol (four sets of six reps at 52.5% 1RM), and the subsequent exercise bout consisted of either a TRAD or an ECC+ protocol (three sets of six reps at 40% 1RM concentric and 100% 1RM eccentric) for the bench press and squat exercises. Blood samples acquired at rest, immediately after (T1), and 15, 30, 45, and 60 min after exercise were assessed for serum TT, BT, GH, and blood lactate concentrations.
Resting and postexercise TT, BT, and GH were not significantly different between groups. Postexercise TT was not elevated during either bout or in either group, whereas BT increased 15-16% at T1 in both groups during bout 2. Postexercise GH concentrations were elevated 500-7000% above baseline after both protocols. Postexercise lactate accumulation and RPE were greater with ECC+ than TRAD.
TRAD and ECC+ show similar neuroendocrine and differing metabolic responses during the early phase of resistance exercise in untrained, college-age men.
本研究旨在比较单次传统（TRAD）和离心增强阻力训练（ECC+）且训练量匹配的情况下，总睾酮（TT）、生物可利用睾酮（BT）、生长激素（GH）、乳酸以及主观用力程度（RPE）的反应。
22名未经训练的男性（21.9±0.8岁）完成一次适应性训练和一次卧推与深蹲练习的基线1RM测试，然后进行两次训练。在训练回合1中，所有受试者完成传统训练方案（52.5% 1RM，四组，每组6次重复），随后的训练回合包括卧推与深蹲练习的传统训练方案（40% 1RM向心收缩和100% 1RM离心收缩，三组，每组6次重复）或离心增强训练方案。在静息状态、训练结束后即刻（T1）以及训练后15、30、45和60分钟采集血样，检测血清TT、BT、GH和血乳酸浓度。
两组之间静息和训练后的TT、BT和GH无显著差异。训练后TT在两个回合或任何一组中均未升高，而在训练回合2中，两组在T1时BT均升高了15 - 16%。两种训练方案后训练后GH浓度均比基线升高了500 - 7000%。与传统训练相比，离心增强训练后乳酸积累和RPE更高。
在未经训练的大学年龄男性进行阻力训练的早期阶段，传统训练和离心增强训练显示出相似的神经内分泌反应和不同的代谢反应。
