School of Kinesiology and Physical Therapy, University of Central Florida, Orlando, FL, USA.
Florida Space Institute, Orlando, FL, USA.
Eur J Sport Sci. 2023 Oct;23(10):1993-2001. doi: 10.1080/17461391.2023.2201813. Epub 2023 May 9.
There is conflicting evidence regarding the prevalence and magnitude of exercise-induced muscle damage (EIMD) following low-load resistance exercise with blood flow restriction (LL + BFR) that may be related to exercise protocols. The purpose of this investigation was to examine the effects of 75-repetition (BFR-75) (1 × 30, 3 × 15) and 4 sets to failure (BFR-4x) protocols on indices of EIMD among untrained women. Thirteen women completed this investigation. One leg was randomly assigned to BFR-75 and the other to BFR-4x. Each leg performed isokinetic, unilateral, concentric-eccentric, leg extension muscle actions at 30% of maximal strength. Indices of EIMD (muscle soreness, range of motion [ROM], limb circumference, pain pressure threshold [PPT], and maximal voluntary isometric contraction [MVIC]) were recorded before exercise, 0-, 24-, 48-, 72-, and 96-hours post-exercise. There were no changes for ROM, circumference, or PPT. Muscle soreness increased similarly in both conditions 0-, 24-, and 48-hours post-exercise and MVIC increased 24-, 48-, 72-, and 96-hours post-exercise. These findings suggested BFR-75 and BFR-4x were not associated with EIMD and elicited similar physiological responses. The increases in muscle soreness may be due to metabolic stress associated with LL + BFR protocols apart from EIMD.
关于低负荷抗阻运动结合血流限制(LL+BFR)后肌肉损伤(EIMD)的流行率和严重程度存在相互矛盾的证据,这可能与运动方案有关。本研究的目的是检验 75 次重复(BFR-75)(1×30,3×15)和 4 组力竭(BFR-4x)方案对未经训练的女性 EIMD 指标的影响。13 名女性完成了此项研究。一条腿被随机分配到 BFR-75 组,另一条腿分配到 BFR-4x 组。每条腿进行等速、单侧、向心-离心、腿部伸展肌肉动作,强度为最大力量的 30%。在运动前、运动后 0 小时、24 小时、48 小时、72 小时和 96 小时记录 EIMD 指标(肌肉酸痛、关节活动度[ROM]、肢体周长、疼痛压力阈值[PPT]和最大自主等长收缩[MVIC])。ROM、周长或 PPT 没有变化。两种条件下的肌肉酸痛在运动后 0 小时、24 小时和 48 小时均相似增加,MVIC 在运动后 24 小时、48 小时、72 小时和 96 小时增加。这些发现表明,BFR-75 和 BFR-4x 与 EIMD 无关,并引起相似的生理反应。肌肉酸痛的增加可能是由于与 LL+BFR 方案相关的代谢应激,而不仅仅是 EIMD。