Determining concentric and eccentric force–velocity profiles during squatting

• DOI: 10.1007/s00421-021-04875-2
• Publication Date: 2022-01-17T11:02:41Z
• Authors: R. Armstrong; V. Baltzopoulos; C. Langan-Evans; D. Clark; J. Jarvis; C. Stewart; T. D. O’Brien
• Keywords: Squatting position; Squat; Ground reaction force; Stretch shortening cycle

The force-velocity relationship of muscular contraction has been extensively studied. However, previous research focussed either on isolated muscle or single-joint movements, whereas human movement consists multi-joint movements (e.g. squatting). Therefore, the purpose this study was to investigate isovelocity squatting.Fifteen male participants (24 ± 2 years, 79.8 9.1 kg, 177.5 6 cm) performed squats a novel motorised device (Kineo Training System) at three concentric (0.25, 0.5, and 0.75 m s-1) eccentric velocities (- 0.25, - s-1). Peak vertical ground reaction forces, that occurred during phase, were collected using dual force plates (2000 Hz) (Kistler, Switzerland).The group mean squat profile conformed typical in vivo profile, with peak forces squatting being 9.5 19% greater than isometric (P = 0.037), occurring between 0.5 s-1. large inter-participant variability identified (0.84-1.62 × force), some unable produce isometric. Sub-group analyses could not identify differences individuals who could/could above isometric, although those tended be taller.These finding suggest exists ability generate maximum squatting, magnitude increase cannot predicted solely based assessment. an assessment capabilities may required prior prescribing eccentric-specific resistance training.