TY - JOUR
T1 - Selective fast fiber damage after leg press exercise leading to failure
T2 - a pole vaulter case report
AU - Carmona, Gerard
AU - Moras, Gerard
AU - Bescós, Raúl
AU - García-Fresneda, Adrián
AU - Cadefau, Joan A.
N1 - Publisher Copyright:
© 2024 Federacion Espanola de Docentes de Educacion Fisica. All rights reserved.
PY - 2024/1/1
Y1 - 2024/1/1
N2 - 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.
AB - 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.
KW - creatine kinase
KW - muscle damage
KW - myosin isoforms
KW - power output
UR - http://www.scopus.com/inward/record.url?scp=85180308440&partnerID=8YFLogxK
UR - https://pearl.plymouth.ac.uk/context/hp-research/article/1527/viewcontent/98084_Article_Text_393772_1_10_20231202.pdf
U2 - 10.47197/RETOS.V51.98084
DO - 10.47197/RETOS.V51.98084
M3 - Article
AN - SCOPUS:85180308440
SN - 1579-1726
VL - 51
SP - 1375
EP - 1380
JO - Retos
JF - Retos
ER -