ORCID
- Bescos Garcia, Raul: 0000-0002-3939-4743
Abstract
The aim of this study was to investigate, in a trained pole vaulter (PV) and in an endurance-trained physical education student (PE), the effect of a leg press exercise leading to failure (LPF) on changes in serum activity of muscle enzymes and serum concentration of fast (FM) and slow (SM) myosin isoforms, while simultaneously examining mechanical output components as indicators of performance and fatigue developed throughout exercise. A case report study design based on an observational comparison of response between two dichotomous participants, PV and PE, was used. Differences between the participants’ exercise outputs were examined by unpaired t-test or Mann-Whitney test and serum levels of muscle enzymes and myosin isoforms were analyzed at baseline and 24 and 48 hours after LPF. Exercise output analyses showed that the PV’s average fatigue index was significantly higher (P = 0.004). Moreover, during the first six sets, the concentric average power exerted by the PV was significantly (P < 0.01) higher (range: 14% to 35%) than that of the PE. The PV only showed acute mild increases of serum creatine kinase (CK) and FM 24 hours after exercise. In contrast, the PE presented persistent serum rises of several muscle enzymes and SM until 48 h after exercise. The PV’s exercise output revealed an explosive (power-oriented) profile leading to selective mild damage of fast fibers. In contrast, the PE exercise output showed a fatigue-resistant profile, which induced greater muscle enzyme activity and SM serum concentration, suggesting a higher extent of slow fiber damage.
DOI
10.47197/RETOS.V51.98084
Publication Date
2024-01-01
Publication Title
Retos
Volume
51
ISSN
1579-1726
Organisational Unit
University of Plymouth
Recommended Citation
Carmona, G., Moras, G., Bescós, R., García-Fresneda, A., & Cadefau, J. (2024) 'Selective fast fiber damage after leg press exercise leading to failure', Retos, 51. Available at: https://doi.org/10.47197/RETOS.V51.98084