Work

Acute effects of supramaximal loaded back squat activation on countermovement jump performance, muscle mechanical properties, and skin surface temperature in powerlifters

Year: 2024

Type: article

Abstract: This study aimed to investigate the effects of performing either eccentric‐only (ECC) or eccentric‐concentric (ECC‐CON) back squats (BS) with a supramaximal load on countermovement jump (CMJ) performance. Changes in front thigh skin surface temperature and mechanical properties (oscillation frequency and stiffness) of the vastus lateralis were also examined. Fourteen male powerlifters participated in this study (age: 22.5 ± 2.3 years, body weight: 84.2 ± 11.1 kg, height: 178 ± 7 cm, training experience: 5.4 ± 1.6 years, BS one‐repetition maximum [1RM]: 177 ± 22.8 kg). The experimental sessions included 2 sets of 2 BS at 110% 1RM of either ECC‐CON (load distributed by half on the barbell [55%] and on weight releasers [55%]) or ECC (only eccentric phase of BS) and CTRL with no CA applied. CMJ performance, mechanical properties, and skin surface temperature were measured before and at the third, sixth, ninth, and 12 th min. After each protocol, only the ECC‐CON condition led to a significant increase in CMJ height after individual optimal rest time compared to pre‐CA (38.1 ± 5.2 vs. 39.8 ± 5.0 cm; p = 0.003; effect size [ES] = 0.32; Δ = 4.9 ± 5.0%) with a significant rise in skin surface temperature (32.98 ± 1.24 vs. 33.69 ± 0.96°C; p = 0.006; ES = 0.62; Δ = 2.2 ± 2.6%) and no significant changes in mechanical properties of the vastus lateralis. The ECC‐CON condition led to a significant acute improvement in CMJ height and an increase in front thigh skin surface temperature among powerlifters. The ECC‐CON supramaximal lower limb PAPE protocol should be effectively used among males representing high levels of lower limb muscle strength (>2 × body mass).

Source: European Journal of Sport Science

DOI: 10.1002/ejsc.12245

Authors: Dawid Perenc, Petr Stastny, Robert Urbański, Michał Krzysztofik

Institutions: Akademii Wychowania Fizycznego im. Jerzego Kukuczki w Katowicach, Charles University, Gdansk University of Physical Education and Sport

Language: English

Topic: Sports Performance and Training

Subfield: Orthopedics and Sports Medicine

Field: Medicine

Domain: Health Sciences

SDG: Good health and well-being

Open Access status: gold

Estimated APC paid: $2,600