TY  - JOUR
A1  - Negra, Yassine
A1  - Chaabene, Helmi
A1  - Fernandez-Fernandez, Jaime
A1  - Sammoud, Senda
A1  - Bouguezzi, Raja
A1  - Prieske, Olaf
A1  - Granacher, Urs
T1  - Short-term plyometric Jump training improves repeated-sprint ability in prepuberal male soccer players
JF  - Journal of strength and conditioning research : the research journal of the NSCA
N2  - This study examined the effects of a short-term (i.e., 8 weeks) combined horizontal and vertical plyometric jump training (PJT) program in combination with regular soccer-specific training as compared with soccer-specific training only on jump and change of direction (CoD) performances, speed, and repeated-sprint ability (RSA) in prepuberal male soccer players. Twenty-four players were recruited and randomly assigned to either a PJT group (PJT(G); n = 13; 12.7 +/- 0.2 years) or an active control group (CONG; n = 11; 12.7 +/- 0.2 years). The outcome measures included tests for the assessment of jump performance (drop jump from 20- to 40-cm height [DJ20 and DJ40] and 3-hop test [THT]), speed (20-m sprint), CoD (T-test), and RSA (20-m repeated shuttle sprint). Data were analyzed using magnitude-based inferences. Within-group analyses revealed large performance improvements in the T-test (d = -1.2), DJ20 (d = 3.7), DJ40 (d = 3.6), THT (d = 0.6), and the RSA(total) (d = -1.6) in the PJT(G). Between-group analyses showed greater performance improvements in the T-test (d = -2.9), 20-m sprint time (d = -2.0), DJ20 (d = 2.4), DJ40 (d = 2.0), THT (d = 1.9), RSA(best) (d = -1.9), and the RSA(total) (d = -1.9) in the PJT(G) compared with CONG. Eight weeks of an in-season PJT in addition to regular soccer-specific training induced larger increases in measures of physical fitness in prepuberal male soccer players compared with regular soccer-specific training only. More specifically, PJT was effective in improving RSA performance.
KW  - youth
KW  - stretch-shortening cycle
KW  - athletic performance
KW  - soccer
Y1  - 2020
U6  - https://doi.org/10.1519/JSC.0000000000002703
SN  - 1064-8011
SN  - 1533-4287
VL  - 34
IS  - 11
SP  - 3241
EP  - 3249
PB  - Lippincott Williams & Wilkins
CY  - Philadelphia
ER  -