¿Existen diferencias en la fuerza máxima, la flexibilidad y la composición corporal en los competidores de CrossFit® según su categoría? (Are there differences in maximal strength, flexibility, and body composition in CrossFit® competitors according to their category?)

Sánchez, Wilder Geovanny Valencia; Manrique, Juan Esteban Hoyos; Chavarría, William Esteban Bedoya; Velásquez, Carlos Alberto Agudelo

doi:10.47197/retos.v47.95614

Cited by 2 publications

(1 citation statement)

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“…Participants started the test from a knee 90 º -angle static position using the adjustable seat of the pneumatic machine, and performed a concentric extension to reach the full extension of 180º against the resistance. The resistance was gradually incremented until the one-repetition maximum (1RM) (Valencia Sánchez et al, 2023). Adjustments to the resistance between trials were made to minimize the total number of attempts necessary to achieve the 1RM.…”

Section: One Repetition Maximum Assessmentmentioning

confidence: 99%

Selective fast fiber damage after leg press exercise leading to failure: a pole vaulter case report

Carmona

2023

Retos

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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. Keywords: muscle damage, creatine kinase, myosin isoforms, power output.

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Section: One Repetition Maximum Assessmentmentioning

confidence: 99%