Dynamic Warm-Up With a Weighted Vest: Improvement of Repeated Change-of-Direction Performance in Young Male Soccer Players

in International Journal of Sports Physiology and Performance
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Purpose: To explore the effect of 4 different warm-up strategies using weighted vests and to determine the specific optimal recovery duration required to optimize the repeated change-of-direction (RCOD) performance in young soccer players. Methods: A total of 19 male soccer players (age 18 [0.88] y, body mass 69.85 [7.68] kg, body height 1.75 [0.07] m, body mass index 22.87 [2.23] kg·m−2, and body fat percentage 12.53% [2.59%]) completed the following loaded warm-up protocols in a randomized, counterbalanced cross-over, within-participants order and on separate days: weighted vest with a loading of 5% (WUV5%), 10% (WUV10%), 15% (WUV15%) body mass, and an unloaded condition (control). RCOD performance (total time, peak time, and fatigue index) was collected during the preintervention phase (5 min after the dynamic stretching sequence) for baseline values and immediately (at 15 min), at 4- and 8-minute postwarm-up intervention. Results: For each postwarm-up tested, recovery times (ie, 15 s, 4 min, and 8 min), of both total and peak times were faster following WUV5%, WUV10%, and WUV15%, compared with the unloaded condition (P ≤.001–.031, d = 1.28–2.31 [large]). There were no significant differences (P = .09–1.00, d = 0.03–0.72 [trivial–moderate]) in-between recovery times in both total and peak times following WUV5%, WUV10%, and WUV15%. However, baseline fatigue index score was significantly worse than all other scores (P ≤.001–.002, d = 1.35–2.46 [large]) following the loaded conditions. Conclusions: The findings demonstrated that a dynamic loaded warm-up increases an athlete’s initial RCOD performance up to the 8-minute postwarm-up intervention. Therefore, strength coaches need to consider using weighted vests during the warm-up for trained athletes in order to acutely optimize RCODs.

Turki and Dhahbi have contributed equally to this work. Turki and Khalifa are with the Research Unit (UR17JS01), Sport Performance, Health & Society, Higher Inst of Sport and Physical Education of Ksar Said, University of La Manouba, Tunis, Tunisia. Dhahbi is with the Sport Science Program, College of Arts and Sciences, Qatar University, Doha, Qatar. Gueid is with the Laboratory of Physiology of Exercise and Physiopathology, Faculty of Medicine Ibn Jazar Sousse, University of Sousse, Sousse, Tunisia. Hmaied is with the Research Unit, Sportive Performance and Physical Rehabilitation, High Inst of Sports and Physical Education of Kef, University of Jendouba, Kef, Tunisia. Souaifi is with the Training Dept, Qatar Police College, Doha, Qatar.

Dhahbi (wissem.dhahbi@gmail.com) is corresponding author.
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