Abstract
This study evaluates changes in trunk rotational power at different weights and velocities after the preparatory and competitive periods in ice-hockey players, tennis players, and canoeists. The subjects performed trunk rotations to each side with a barbell of different weights placed on the shoulders (6, 10, 12, 16, 20, 22, and 26 kg) prior to and after 6 weeks of the preparatory period and 6 weeks of the competitive period. The results showed that mean power produced in the acceleration phase of trunk rotations increased significantly at weights from 10 to 26 kg or 6 to 26 kg after the preparatory and competitive periods in tennis players. The values obtained during trunk rotations with weights ≥12 kg also increased significantly after the preparatory period in ice-hockey players, whereas there were no significant changes after the competitive period. Similarly, the mean power during trunk rotations with weights ≥10 kg increased significantly only after the preparatory period in canoeists. Similar changes were observed for the peak power. These findings demonstrate that changes in trunk rotational power reflect the specificity of their training programs. This information may provide a basis for designing exercises focused on improvements of power produced during trunk rotations under loading conditions.
Highlights
The important role of the core for force generation and stabilization in most sports is being recognized
There was a significant increase of the mean power produced during trunk rotations at weights of 6 kg (14.2%, p = 0.012), 10 kg (17.8%, p < 0.001), 12 kg (19.2%, p < 0.001), 16 kg the trunk rotational power between the preparatory and the competitive period in these groups of
A significant increase of the mean power produced during trunk rotations at weights of 12 kg (7.6%, p = 0.019), 16 kg (13.0%, p < 0.001), 20 kg (13.3%, p = 0.003), 22 kg (21.4%, p < 0.001), and 26 kg (14.7%, p < 0.001) and the peak power at 20 kg (13.7%, p = 0.020), 22 kg (25.3%, p = 0.047), and 26 kg (16.0%, p = 0.020) was observed after the preparatory period in ice-hockey players
Summary
The important role of the core for force generation and stabilization in most sports is being recognized. Core strength is related to the strength and power produced by these muscles, whereas the core stability is the capacity of the muscles to control the trunk position and its motion over the pelvis and leg to allow the force production to the terminal segment in integrated kinetic chain exercises [2]. Core strength and stability exercises have been used as performance-enhancing programs, preventative regimens, and to help with rehabilitation. Prevention and rehabilitation of injuries [5,6]. This is due to the lack of testing methods of core strength and stability
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