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- Title
Feasibility of vertical force–velocity profiles to monitor changes in muscle function following different fatigue protocols.
- Authors
Li, Zhaoqian; Zhi, Peng; Yuan, Zhi; García-Ramos, Amador; King, Mark
- Abstract
Purpose: This study aimed to explore the feasibility of vertical force–velocity (F–V) profiles to monitor changes in muscle function following different fatigue protocols. The between-day reliability of vertical F–V profiles and the acute effects of two fatigue protocols on the changes of lower limb muscle function were examined. Methods: Twelve resistance trained males completed a preliminary session to determine their back squat one-repetition maximum (1RM). Afterwards, they randomly performed two experimental sessions that only differed in the fatigue protocol applied: heavy-load traditional (HLT; five repetitions at 80% 1RM) and light-load ballistic (LLB; five repetitions at 30% 1RM) squat protocols. Participants' vertical F–V profiles (maximum theoretical force [F0], maximum theoretical velocity [v0], and maximum power output [Pmax]) were calculated before and immediately after each fatigue protocol. Results: F0, v0, and Pmax showed acceptable to good between-day reliability (coefficient of variation ≤ 4.4%; intraclass correlation coefficient ≥ 0.84). Both fatigue protocols promoted a comparable reduction in Pmax (−10.1% for HLT and −12.2% for LLB). However, the LLB squat protocol reduced more v0 (−9.7%) than F0 (−0.4%), while the HLT squat protocol reduced F0 (−8.4%) more than v0 (−4.1%). Conclusions: The vertical F–V profile can be used to monitor changes in muscle function given its acceptable between-day reliability and its high sensitivity to detect the acute effect of force-oriented and velocity-oriented fatigue protocols on specific maximal neuromuscular capacities.
- Subjects
FATIGUE (Physiology); SQUAT (Weight lifting); RESISTANCE training; INTRACLASS correlation
- Publication
European Journal of Applied Physiology, 2024, Vol 124, Issue 1, p365
- ISSN
1439-6319
- Publication type
Article
- DOI
10.1007/s00421-023-05283-4