Department of Kinesiology and Health Promotion, University of Kentucky, Lexington, Kentucky.
Kinesiology and Athletic Training Department, University of Wisconsin Oshkosh, Oshkosh, Wisconsin.
J Strength Cond Res. 2018 Jun;32(6):1479-1490. doi: 10.1519/JSC.0000000000002480.
Bergstrom, HC, Byrd, MT, Wallace, BJ, and Clasey, JL. Examination of a multi-ingredient preworkout supplement on total volume of resistance exercise and subsequent strength and power performance. J Strength Cond Res 32(6): 1479-1490, 2018-This study examined the acute effects of a multi-ingredient preworkout supplement on (a) total-, lower-, and upper-body volume of resistance exercise and (b) the subsequent lower-body strength (isokinetic leg extension and flexion), lower-body power (vertical jump [VJ] height), upper-body power (bench throw velocity [BTv]), and cycle ergometry performance (critical power and anaerobic work capacity). Twelve men completed baseline strength and power measures before 2 experimental visits, supplement (SUP) and placebo (PL). The experimental visits involved a fatiguing cycling protocol 30 minutes after ingestion of the SUP or PL and 15 minutes before the beginning of the resistance exercise protocol, which consisted of 4 upper-body and 4 lower-body resistance exercises performed for 4 sets to failure at 75% 1 repetition maximum. The exercise volume for the total, lower, and upper body was assessed. The VJ height and BTv were measured immediately after the resistance exercise. Postexercise isokinetic leg extension and flexion strength was measured 15 minutes after the completion of a second cycling protocol. There was a 9% increase in the total-body volume of exercise and a 14% increase in lower-body volume of exercise for the SUP compared with the PL, with no effect on exercise volume for the upper body between the SUP and PL. The increased lower-body volume for the SUP did not result in greater lower-body strength and power performance decrements after exhaustive exercise, compared with the PL. These findings suggested the potential for the SUP to increase resistance exercise volume, primarily related to an increased lower-body volume of exercise.
伯格斯特龙，HC，拜德，MT，华莱士，BJ，和克拉斯利，JL。检查一种多成分的预锻炼补充剂对总阻力运动总量以及随后的力量和功率表现的影响。J 强度条件研究 32（6）：1479-1490，2018-本研究检查了一种多成分的预锻炼补充剂对（a）总，下和上体阻力运动总量和（b）随后的下体力量（等速腿伸和腿屈），下体功率（垂直跳跃[VJ]高度），上体功率（卧推速度[BTv]）和循环测功机性能（临界功率和无氧工作能力）的急性影响。12 名男性在 2 次实验访问前完成了基线力量和功率测量，补充剂（SUP）和安慰剂（PL）。实验访问涉及在摄入 SUP 或 PL 后 30 分钟进行疲劳循环方案，然后在开始阻力运动方案前 15 分钟进行，该方案由 4 个上体和 4 个体下阻力运动组成，以 75%的 1 次重复最大值进行 4 组至失败。评估了总，下和上体的运动总量。VJ 高度和 BTv 在阻力运动后立即测量。等速腿伸和腿屈强度在完成第二个循环方案后 15 分钟测量。与 PL 相比，SUP 使全身运动总量增加了 9%，下体运动总量增加了 14%，而上体运动总量没有变化。与 PL 相比，SUP 增加的下体运动总量并没有导致更剧烈的下体力量和功率表现下降。这些发现表明 SUP 具有增加阻力运动总量的潜力，主要与下体运动总量增加有关。
