• Ana Paula da Silva Azevedo, Fernanda Michelone Acquesta, Antonio Herbert Lancha, Romulo Bertuzzi, Jacques R Poortmans, Alberto Carlos Amadio, and Julio Cerca Serrão.
• Laboratory of Biomechanics, School of Physical Education and Sport, University of São Paulo, São Paulo, Brazil. Electronic address: anaazevedo@usp.br.
• Nutrition. 2019 May 1; 61: 99-104.

ObjectivesThis study aimed to investigate the effects of creatine (Cr) supplementation on biomechanical parameters related to shock attenuation during a session of high-intensity interval training (HIIT).MethodsA single-blinded, placebo-controlled, crossover design was adopted to test eight male elite soccer players during HIIT sessions under two conditions: after placebo supplementation and after Cr supplementation. HIIT test sessions consisted of an intermittent test (five bouts of running) with a constant load applied until exhaustion was reached. The vertical component of ground reaction force and electromyography data were recorded by Gaitway and Lynx-EMG Systems, respectively. Heart rate, rated perceived exertion (Borg's Scale) and lactate concentration information were also obtained.ResultsCr supplementation did not affect heart rate, rated perceived exertion, and lactate concentration. Decreased values of magnitude of the first peak of the vertical component of ground reaction force (17.2-24.2%) and impulse of the first 50 ms (Imp50; 34.3%) were observed for Cr, but higher values of time to reach the first peak were detected for Cr compared with placebo. Significant modifications in muscle activation were also observed, mainly in the pre-activation phase, and changes were observed in intermediary bouts.ConclusionsCr supplementation has the potential to influence biomechanical parameters related to impact control during a single session of HIIT based on running. In particular, the findings of the current study indicate possible improvements in shock attenuation and a safer practice of HIIT under Cr supplementation.Copyright © 2018 Elsevier Inc. All rights reserved.

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