Delayed neuromuscular fatigue recovery unveils reduced fatigue tolerance in elderly following maximal intermittent exercise.

Autor: Zarzissi S; High Institute of Sport and Physical Education, Education, Motor Skills, Sport and Health (EM2S) Laboratory, University of Sfax, LR19JS01, Sfax, Tunisia. zarzissislim@gmail.com., Zghal F; High Institute of Sport and Physical Education, Education, Motor Skills, Sport and Health (EM2S) Laboratory, University of Sfax, LR19JS01, Sfax, Tunisia., Bouchiba M; High Institute of Sport and Physical Education, Education, Motor Skills, Sport and Health (EM2S) Laboratory, University of Sfax, LR19JS01, Sfax, Tunisia., Rebai H; Tunisian Research Laboratory 'Sports Performance Optimization', National Center of Medicine and Science in Sports (CNMSS), (CNMSS-LR09SEP01), Tunis, Tunisia., Fekih N; High Institute of Sport and Physical Education, Education, Motor Skills, Sport and Health (EM2S) Laboratory, University of Sfax, LR19JS01, Sfax, Tunisia., Bouzid MA; High Institute of Sport and Physical Education, Education, Motor Skills, Sport and Health (EM2S) Laboratory, University of Sfax, LR19JS01, Sfax, Tunisia.
Jazyk: angličtina
Zdroj: European journal of applied physiology [Eur J Appl Physiol] 2024 Oct; Vol. 124 (10), pp. 2941-2949. Date of Electronic Publication: 2024 May 17.
DOI: 10.1007/s00421-024-05499-y
Abstrakt: The aim of the study was to assess the impact of aging on neuromuscular fatigue and recovery. Ten young (23.08 ± 1.43 years) and older (61.19 ± 1.80 years) males performed an intermittent maximal isometric exercise with the knee extensors followed by 27 min of recovery. Maximal voluntary contraction (MVC), total work (W'), voluntary activation (VA), potentiated resting twitch (Ptw), and electromyography (EMG) were recorded and then analyzed. Peripheral and central fatigue following exercise were lower in old compared to young (- 29.99% vs.  - 42.68% and  - 14.55 vs.  - 20.02%; P < 0.05, respectively). Despite old performing 50% less work, RMS/M max reduction was similar between old and young (- 26.46% vs.  - 29.93%; P > 0.05, respectively). During the recovery period, our results showed that recovery of the MVC was impaired for old (14.93% for old vs. 30.66% for young) and still incomplete until 27 min.VA increased significantly compared to post exercise after 1 min only for young (P = 0.001), potentially affecting the recovery pattern of MVC during the early phase due to their significant correlation (r 2  = 0.58, P = 0.01). Peripheral fatigue recovery was also lower for old (11.18% vs. 18.72%; P < 0.001), and both groups failed to recover their baseline value (both P < 0.005). The lower peripheral and central fatigue observed in elderly following exercise appears for the first instance as a fatigue resistance. However, the delayed neuromuscular recovery reveals instead a reduced fatigue tolerance reflecting age-related alteration within contractile properties and/or within central nervous system.
(© 2024. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)
Databáze: MEDLINE
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