Strength training prior to endurance exercise: impact on the neuromuscular system, endurance performance and cardiorespiratory responses

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Matheus Conceicao, Eduardo Lusa Cadore, Miriam Gonzalez-Izal, Mikel Izquierdo, Giane Veiga Liedtke, Eurico Nestor Wilhelm, Ronei Silveira Pinto, Fernanda Reistenbach Goltz, Claudia Dornelles Schneider, Rodrigo Ferrari, Martim Bottaro, Luiz Fernando Martins Kruel

This study aimed to investigate the acute effects of two strength-training protocols on the neuromuscular and cardiorespiratory responses during endurance exercise. Thirteen young males (23.2 ± 1.6 years old) participated in this study. The hypertrophic strength-training protocol was composed of 6 sets of 8 squats at 75% of maximal dynamic strength. The plyometric strength-training protocol was composed of 6 sets of 8 jumps performed with the body weight as the workload. Endurance exercise was performed on a cycle ergometer at a power corresponding to the second ventilatory threshold until exhaustion. Before and after each protocol, a maximal voluntary contraction was performed, and the rate of force development and electromyographic parameters were assessed. After the hypertrophic strength-training and plyometric strength-training protocol, significant decreases were observed in the maximal voluntary contraction and rate of force development, whereas no changes were observed in the electromyographic parameters. Oxygen uptake and a heart rate during endurance exercise were not significantly different among the protocols. However, the time-to-exhaustion was significantly higher during endurance exercise alone than when performed after hypertrophic strength-training or plyometric strength-training (p <0.05). These results suggest that endurance performance may be impaired when preceded by strength-training, with no oxygen uptake or heart rate changes during the exercise
DOI: 10.2478/hukin-2014-0123
Key words
surface EMG, fatigue, concurrent training, aerobic exercise, maximal strength,

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