Reduced rate of force development under fatigued conditions is associated to the decline in force complexity in adult males.

Autor: D'Emanuele S; Department of Neuroscience, Biomedicine and Movement Sciences, University of Verona, Verona, Italy., Boccia G; Department of Clinical and Biological Sciences, University of Turin, Turin, Italy. gennaro.boccia@unito.it., Angius L; Department of Sport, Exercise, and Rehabilitation, Northumbria University, Newcastle upon Tyne, UK., Hayman O; Department of Sport, Exercise, and Rehabilitation, Northumbria University, Newcastle upon Tyne, UK., Goodall S; Department of Sport, Exercise, and Rehabilitation, Northumbria University, Newcastle upon Tyne, UK., Schena F; Department of Neuroscience, Biomedicine and Movement Sciences, University of Verona, Verona, Italy., Tarperi C; Department of Neuroscience, Biomedicine and Movement Sciences, University of Verona, Verona, Italy.
Jazyk: angličtina
Zdroj: European journal of applied physiology [Eur J Appl Physiol] 2024 Dec; Vol. 124 (12), pp. 3583-3591. Date of Electronic Publication: 2024 Jul 24.
DOI: 10.1007/s00421-024-05561-9
Abstrakt: Purpose: This study aimed to verify whether the slowing of muscle contraction quickness, typically observed in states of fatigue, may worsen force control by decreasing the rate with which force fluctuations are modulated. Therefore, we investigated the relationship between rate of force development (RFD), and force fluctuations' magnitude (Coefficient of variation, CoV) and complexity (Approximate Entropy, ApEn; Detrended fluctuation analysis, DFAα).
Methods: Fourteen participants performed intermittent ballistic isometric contractions of the plantar dorsiflexors at 70% of maximal voluntary force until task failure (under 60% twice).
Results: Indices of RFD (RFD peak , RFD 50 , RFD 100 , and RFD 150 ) decreased over time by approximately 46, 32, 44, and 39%, respectively (p all ≤ 0.007). DFAα increased by 10% (p < 0.001), and CoV increased by 15% (p < 0.001), indicating decreased force complexity along with increased force fluctuations, respectively. ApEn decreased by just over a quarter (28%, p < 0.001). The linear hierarchical models showed negative associations between RFD peak and DFAα (β =  - 3.6 10 -4 , p < 0.001), CoV (β =  - 1.8 10 -3 , p < 0.001), while ApEn showed a positive association (β = 8.2 × 10 -5 , p < 0.001).
Conclusion: The results suggest that exercise-induced reductions in contraction speed, lead to smoother force complexity and diminished force control due to slower adjustments around the target force. The fatigued state resulted in worsened force producing capacity and overall force control.
Competing Interests: Declarations Conflict of interest No conflicts of interest, financial or otherwise, are declared by the authors. Ethical approval The subjects involved provided written informed consent before they participated in this study, which was approved by the local Ethical Advisory Committee (Department of Sport, Exercise, & Rehabilitation, Northumbria University—approval no: 43148) and performed in accordance with the Helsinki Declaration.
(© 2024. The Author(s).)
Databáze: MEDLINE
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