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 strengthtraining
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