Acute neuromuscular fatigue, hormonal responses, and recovery in males during high-volume resistance exercises: Smith machine back squat vs horizontal leg press.

IF 2.8 3区医学 Q2 PHYSIOLOGY

European Journal of Applied Physiology Pub Date : 2025-05-05 DOI:10.1007/s00421-025-05793-3

Johanna Kotikangas, Simon Walker, Keijo Häkkinen, Heikki Peltonen

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引用次数: 0

Abstract

Purpose: This study compared acute neuromuscular and hormonal responses and recovery in males during resistance exercises performed in Smith machine back squat (SQ) and horizontal leg press (LP).

Methods: Twelve healthy, physically active men performed SQ and LP loadings consisting of 5 sets at ten-repetition maximum. Maximal bilateral isometric force and sEMG activity of quadriceps femoris over 500 ms (MIVC_EMG) in isometric leg press, countermovement jump height, and resting twitch force were assessed before (PRE) and immediately after loadings (POST), and after recovery of 30 min (POST30), 24 h (POST24), and 48 h. Serum concentrations of cortisol (COR), growth hormone (GH), testosterone, and creatine kinase were assessed at the same time points and additionally after third set (MID). Blood lactate (BL) was measured at PRE, MID, POST, and POST30.

Results: Total work performed was significantly higher during SQ than LP ( 43.0 ± 5.2 kJ vs. 29.1 ± 3.1 kJ, p < 0.001). All blood-based parameters increased significantly during both loadings (p < 0.01). COR and GH were significantly higher at MID, POST, and POST30, and BL at MID during SQ than LP (p < 0.05). Neuromuscular variables decreased significantly from PRE to POST during both loadings (p < 0.05), with an interaction observed in MIVC_EMG between SQ and LP (- 10.4 vs. 6.4%, p < 0.01). All variables had returned to baseline by POST24.

Conclusion: SQ may provide a more potent stimulus for metabolic and hormonal responses during high-volume resistance exercise, at least partly due to the greater total work performed. Nevertheless, fatigue induced within the quadriceps femoris was similar between SQ and LP.

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急性神经肌肉疲劳，激素反应和男性在大容量阻力运动中的恢复：史密斯机后蹲与水平腿按压。

目的：本研究比较了男性在史密斯机后蹲（SQ）和水平腿按压（LP）阻力训练中急性神经肌肉和激素反应和恢复情况。方法：12名健康、体力活跃的男性进行SQ和LP负荷，包括5组，最多10次重复。在等距腿压、反动作跳跃高度和静息抽搐力的500 ms （MIVCEMG）中，在负荷前（PRE）和负荷后立即（POST）以及恢复后30分钟（POST30）、24小时（POST24）和48小时评估最大双侧等距力和股四头肌肌电活动。在同一时间点和第三组（MID）后评估血清皮质醇（COR）、生长激素（GH）、睾酮和肌酸激酶浓度。在PRE、MID、POST和POST30测定血乳酸（BL）。结果：SQ组的总功明显高于LP组（43.0±5.2 kJ vs. 29.1±3.1 kJ）， p肌电图在SQ组和LP组之间（- 10.4 vs. 6.4%）。结论：SQ组可能在大容量阻力运动中对代谢和激素反应提供更有效的刺激，至少部分原因是SQ组的总功更大。然而，在SQ和LP之间，股四头肌引起的疲劳是相似的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

European Journal of Applied Physiology 医学-生理学

CiteScore

6.00

自引率

6.70%

发文量

227

审稿时长

3 months

期刊介绍： The European Journal of Applied Physiology (EJAP) aims to promote mechanistic advances in human integrative and translational physiology. Physiology is viewed broadly, having overlapping context with related disciplines such as biomechanics, biochemistry, endocrinology, ergonomics, immunology, motor control, and nutrition. EJAP welcomes studies dealing with physical exercise, training and performance. Studies addressing physiological mechanisms are preferred over descriptive studies. Papers dealing with animal models or pathophysiological conditions are not excluded from consideration, but must be clearly relevant to human physiology.