Abstract
Objective Compare the acute effects of dynamic stretching protocols on the isokinetic performance of the quadriceps and hamstring muscles at two velocities in adult males.Methodology Included the participation of 14 males (21 ± 2.6 years; 178 ± 0.4 cm; 73.2 ± 20.9 kg) were assessed using an isokinetic dynamometer before and after following a short or long-duration dynamic stretching protocol or a control protocol. The results were assessed by a two-way ANOVA and a Scheffé’s post hoc test at a 5% significance level.Results No difference was found in the variables assessed at 180°/s after LDDS. At 60°/s, LDDS reduced the power of the knee flexors. The control protocol reduced the power of the knee flexors and increased the power of the extensors. At 60°/s, the work of the knee flexors exhibited a reduction after LDDS. The control protocol resulted in a reduction in the work of the flexors. The peak torque angle exhibited a reduction in the extensors and flexors after LDDS and SDDS.Conclusion Dynamic stretching did not cause any change in the peak torque, which points to its possible use in activities involving velocity and muscle strength. The executing dynamic stretching before physical activities such as running and high-intensity sports might be beneficial by promoting increases in heart rate and in body temperature.
Highlights
Athletes usually perform a specific warm-up routine as preparation
Significant differences were not found in the peak torque, the total work, the average power, or the peak torque angle of the knee extensors or flexors in either the concentric or the eccentric phases of movement at an angular velocity of 180°/s
The present study investigated the acute effects of shortduration dynamic stretching protocol (SDDS) and LDDS and a control protocol on the isokinetic performance of the knee flexors and extensors at two different angular velocities, 60°/s and 180°/s
Summary
Athletes usually perform a specific warm-up routine as preparation. Authors such as [1, 2, 3, 4, 5, 6] among others, recommend warming up for athletes to prepare mentally and physically for training or competition. The primary aims of dynamic stretching are: to modify the level of strength of the muscles involved in the movement, to promote the stretch reflex, to favor the contraction of the stretched muscles, to increase the body temperature, and to reduce the stiffness of muscles and joints [8, 9]. Some studies, such as the one by [10], found significant increases in muscle power following dynamic stretching. [8] and [13] did not find any changes in muscle strength following dynamic stretching
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