Zourdos Michael C, Henning Paul C, Jo Edward, Khamoui Andy V, Lee Sang-Rok, Park Young-Min, Naimo Marshall, Panton Lynn B, Nosaka Kazunori, Kim Jeong-Su
1Department of Exercise Science and Health Promotion, Florida Atlantic University, Boca Raton, Florida; 2Military Performance Division, U.S. Army Research Institute of Environmental Medicine, Natick, Massachusetts; 3Department of Kinesiology and Health Promotion, California State Polytechnic University, Pomona, California; 4Department of Nutrition, Food, and Exercise Sciences, The Florida State University, Tallahassee, Florida; 5Department of Health and Sport Sciences, The University and Memphis, Memphis, Tennessee; 6Department of Nutrition and Exercise Physiology, University of Missouri, Columbia, Missouri; and 7School of Exercise and Health Sciences, Centre for Exercise and Sports Science Research, Edith Cowan University, Joondalup, WA, Australia.
J Strength Cond Res. 2015 Aug;29(8):2270-6. doi: 10.1519/JSC.0000000000000856.
A single bout of unaccustomed exercise confers protective effect against muscle damage from a subsequent bout of similar activity, that is, repeated bout effect (RBE). It remains unknown whether varying muscle-specific exercise between sessions alters the magnitude of the RBE. This study examined the effects of muscle-specific exercise variation between consecutive sessions on the RBE. Twenty untrained males (21 ± 2 years) were assigned to one of 2 groups (n = 10 per group): (a) 2 sessions of incline curls, Fixed Exercise or (b) 1 session of incline curls followed by 1 session of preacher curls, Varied Exercise, with 7 days between sessions. Subjects performed 5 sets of 6 repetitions at ∼50% of maximal isometric elbow flexor strength during each session. Changes in maximal voluntary isometric and isokinetic torque, range of motion, muscle soreness, and serum creatine kinase were measured before, immediately after, and 24, 48, 72, and 96 hours after each exercise session, and the changes were compared between bouts and between groups. There were significant time effects (p < 0.05) for isometric maximal voluntary contraction, concentric maximal voluntary contraction, range of motion, and muscle soreness during sessions 1 and 2 with no between-group differences. Both groups demonstrated a significantly faster recovery of range of motion and soreness to baseline levels after session 2 compared with session 1. Overall, our findings suggest that incline curls conferred a protective effect during subsequent preacher curls in a similar way to repeating incline curls; therefore, the RBE was not exercise specific.
一次不习惯的运动能对随后一次类似活动造成的肌肉损伤产生保护作用，即重复运动效应（RBE）。各训练时段之间进行不同的特定肌肉运动是否会改变RBE的程度尚不清楚。本研究调查了连续训练时段之间特定肌肉运动变化对RBE的影响。20名未经训练的男性（21±2岁）被分为2组（每组n = 10）：（a）进行2组上斜弯举，即固定运动组；或（b）先进行1组上斜弯举，接着进行1组牧师椅弯举，即变化运动组，两组训练时段间隔7天。每次训练时，受试者以约最大等长屈肘力量的50%进行5组，每组6次重复动作。在每次训练前、训练结束后即刻、训练后24、48、72和96小时测量最大随意等长和等速扭矩、关节活动范围、肌肉酸痛及血清肌酸激酶的变化，并比较两组训练时段之间以及两组之间的变化情况。在第1次和第2次训练期间，等长最大随意收缩、向心最大随意收缩、关节活动范围和肌肉酸痛有显著的时间效应（p < 0.05），但组间无差异。与第1次训练相比，两组在第2次训练后关节活动范围和酸痛恢复至基线水平的速度均明显加快。总体而言，我们的研究结果表明，上斜弯举在随后的牧师椅弯举过程中产生的保护作用与重复进行上斜弯举类似；因此，RBE并非特定于某种运动。
