Abstract
This study aimed to evaluate the differences in power production between movement phases (i.e., concentric and eccentric) during the execution of resistance exercises with a flywheel device, differentiating between execution regimes (i.e., bilateral, unilateral dominant leg and unilateral non-dominant leg). Twenty young elite soccer players (U−17) performed two sets of six repetitions of the bilateral half-squat (inertia 0.025 kg·m−2) and the lateral-squat exercise (inertia 0.010 kg·m−2) on a flywheel device. During the testing sessions, mean and peak power in concentric (MPcon) and eccentric (MPecc) phases were recorded. The non-dominant leg showed higher values in all power variables measured, although substantial differences were only found in MPecc (ES = 0.40, likely) and PPcon (ES = 0.36, possibly). On the other hand, for both exercises, MPcon was higher than MPecc (ES = −0.57 to −0.31, possibly/likely greater), while only PPecc was higher than PPcon in the dominant lateral-squat (ES = 0.44, likely). These findings suggest that young soccer players have difficulty in reaching eccentric-overload during flywheel exercises, achieving it only with the dominant leg. Therefore, coaches should propose precise preventive programs based on flywheel devices, attending to the specific characteristics of each limb, as well as managing other variables to elicit eccentric-overload.
Highlights
Soccer is a team sport characterized by a large number of high intensity and short-term actions which demand the production of unilateral actions such as sprints, changes of direction or jumps [1].These powerful actions usually precede the most determinant actions in soccer [2], whereby improving the strength of the lower limbs seems to be a key strategy to maximize the players’ on-field competitive performance [3,4]
The inclusion criteria were that the players completed all the familiarization and test sessions and that they had not suffered any injury in the two months prior to the assessment
Execution regimes influence the power generated during resistance exercises executed on an FD by young soccer players in each movement phase (i.e., CON and ECC), showing greater MPecc values in the non-dominant leg in comparison to the dominant leg
Summary
Soccer is a team sport characterized by a large number of high intensity and short-term actions which demand the production of unilateral actions such as sprints, changes of direction or jumps [1] These powerful actions usually precede the most determinant actions in soccer (e.g., goal) [2], whereby improving the strength of the lower limbs seems to be a key strategy to maximize the players’ on-field competitive performance [3,4]. In this regard, some authors have highlighted the relationship between higher power outcomes (i.e., mean and peak power) and the capacity to perform high-intensity actions (i.e., sprint, vertical jump and change of direction) [5]. ECC actions during resistance programs are characterized by producing higher peaks of force [13] with lower muscle activation [14], lower metabolic cost [15] and earlier increments in muscle mass [16] in relation to CON-based resistance exercises
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