Comparison of load-velocity relationships in two bench press variations: weight stack machine vs Smith machine. Issue 10 (26th November 2022)

• Record Type: Journal Article
• Authors: Rodiles-Guerrero, Luis; Pareja-Blanco, Fernando; León-Prados, Juan Antonio
• Is Part Of: Sports biomechanics. Volume 21:Issue 10(2022)
• Page Start: 1147
• Page End: 1159
• Publication Date: 2022-11-26
• Subjects: Resistance training -- velocity-based training -- muscle strength -- 1RM prediction -- isoinertial assessment; Biomechanics -- Periodicals; Sports -- Physiological aspects -- Periodicals; Human mechanics -- Periodicals; 617.1027
• DOI: 10.1080/14763141.2020.1735499
• Languages: English
• ISSNs: 1476-3141

Abstract

ABSTRACT: Performing the bench-press (BP) exercise in a weight stack machine (WSM) is a common practice. However, no previous studies have analysed the load-velocity relationship in this BP variant. The purpose of this study was 1) to investigate the load-velocity relationship during BP exercise using a WSM; and 2) to compare the load-velocity relationship in this exercise in two conditions: WSM vs. Smith machine (SM). Twenty-six young men performed a BP progressive loading test to determine their one-repetition maximum and load-velocity relationship using a WSM. Additionally, 19 participants performed two progressive loading tests (WSM and SM). A high relationship was found between the relative load (%1RM) and mean propulsive velocity (MPV) (R2 = 0.97; SEE = 0.07 m/s) in the WSM. Moreover, significant differences were observed ( p <.05) in the MPV values attained in every %1RM in WSM and SM from 30 to 75% 1RM. The close relationship between the MPV values and the %1RM in BP exercise using a WSM enables coaches to use the MPV to accurately monitor their athletes on a daily basis. The differences observed between WSM and SM in the %1RM and their respective MPVs indicate that different equations must be used for each exercise mode.