SECTION I - KINESIOLOGY / RESEARCH PAPER
Acute Kinetic and Kinematic Responses to Varied Loading in the Behind-the-Neck Push Jerk: Impact on Force and Power Production
1
Department of Sports Training Science-Combats, National Taiwan Sport University, Taoyuan, Taiwan.
2
Department of Sport Science Research, Taiwan Institute of Sports Science, Kaohsiung, Taiwan.
3
Graduate Institute of Athletics and Coaching Science, National Taiwan Sport University, Taoyuan, Taiwan.
4
Department of Sports Medicine, China Medical University, Taichung, Taiwan.
5
Department of Sports Medicine and Nutrition, University of Pittsburgh, Pittsburgh, Pennsylvania, United States.
6
Department of Sport and Kinesiology, National Taiwan Normal University, Taipei, Taiwan.
Submission date: 2025-04-06
Final revision date: 2025-06-10
Acceptance date: 2026-01-26
Online publication date: 2026-06-01
Corresponding author
Chieh-ying Chiang
Department of Sports Training Science-Combats, National Taiwan Sport University, Taiwan
Department of Sports Training Science-Combats, National Taiwan Sport University, Taiwan
KEYWORDS
weightlifting overhead pressing derivativesoverloadlower extremitiesathletic performancebiomechanics
TOPICS
ABSTRACT
While the influence of the load on mechanical outcomes has been investigated in weightlifting pulling derivatives, knowledge of these relationships in overhead pressing derivatives remains limited. To address this gap, this study examined the effects of varying loads on the force-time characteristics associated with peak power output in the behind-the-neck push jerk (BNPJ). Sixteen recreational male athletes were recruited and performed three repetitions of the BNPJ at 40%, 50%, 60%, 70%, and 80% of their 1RM. Mean system velocity (MSV), propulsive phase time (Time), peak force (PF), mean force (MF), peak power (PP), mean power (MP), the impulse and depth were calculated from force-time data during the propulsive phase and compared across loads. A series of one-way repeated measures analysis of variance (ANOVA) was used to compare the differences in each variable across intensities. The level of significance was set at p ≤ 0.05. Except for MSV, all variables progressively increased with loads. PF, MF, PP, MP, and the impulse were greatest at 80% 1RM with small to large significant differences between other intensities (p = 0.00–0.02, Hedge’s g = 0.26–2.49). There were no significant differences between 70% and 80% 1RM in PV (p = 0.35, g = 0.18), but there were significant differences between 80% 1RM and 40%, 50%, and 60% 1RM (p = 0.01–0.05, g = 0.14–0.64). Prescribing the BNPJ at 80% 1RM is beneficial in enhancing power and force output.
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