Biochemical and Muscle Mechanical Postmarathon Changes in Hot and Humid Conditions.

Journal of Strength and Conditioning Research
Randall Gutiérrez-VargasDaniel Rojas-Valverde

Abstract

Gutiérrez-Vargas, R, Martín-Rodríguez, S, Sánchez-Ureña, B, Rodríguez-Montero, A, Salas-Cabrera, J, Gutiérrez-Vargas, JC, Simunic, B, and Rojas-Valverde, D. Biochemical and muscle mechanical postmarathon changes in hot and humid conditions. J Strength Cond Res 34(3): 847-856, 2020-The aim of this study was to compare biochemical changes and mechanical changes in the lower-limb muscles before and after a marathon race in hot and humid conditions. Eighteen healthy runners participated in a marathon at between 28 and 34° C and 81% humidity in Costa Rica. Serum magnesium (Mg), creatine phosphokinase (CPK), lactate dehydrogenase, and hematocrit (HCT) were measured before and after the marathon. Tensiomyography measurements from the rectus femoris (RF) and vastus medialis, muscle displacement (Dm), contraction time (Tc), and velocities of contraction to 10 and 90% of Dm (V10 and V90) were obtained before and after the marathon. Postrace measurements showed a 544% increase in CPK (t(17): -6.925, p < 0.01), a 16% increase in HCT (t(17): -7.466, p < 0.01), a 29% decrease in Mg (t(17): 3.91, p = 0.001), a 2% decrease in body mass (t(17): 4.162, p = 0.001), a 4% increase in Tc of the RF (t(17): -2.588, p = 0.019), and a 12% increase in Dm...Continue Reading

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Citations

Oct 18, 2019·International Journal of Environmental Research and Public Health·Daniel Rojas-ValverdeGuillermo Olcina
Dec 22, 2020·Frontiers in Sports and Active Living·Daniel Rojas-ValverdeBraulio Sánchez-Ureña
Jan 21, 2021·Journal of Functional Morphology and Kinesiology·Ismael Martínez-GuardadoBraulio Sánchez-Ureña
Jan 21, 2021·Journal of Functional Morphology and Kinesiology·Daniel Rojas-ValverdeGuillermo Olcina

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