title: Effects of horizontal plyometric training volume on soccer players' performance.
abstract: The aim of this study was to examine the dose response effect of strength and conditioning programmes, involving horizontally oriented plyometric exercises, on relevant soccer performance variables. Sixteen soccer players were randomly allocated to two 6-week plyometric training groups (G1 and G2) differing by imposed (twice a week) training volume. Post-training G1 (4.13%; d = 0.43) and G2 (2.45%; d = 0.53) moderately improved their horizontal countermovement jump performance. Significant between-group differences (p < 0.01) in the vertical countermovement jump for force production time (T2) were detected post-training. No significant and practical (p > 0.05, d = trivial or small) post-training improvements in sprint, change of direction ability (CODA) and horizontal arm swing countermovement jump were reported in either group. Horizontal plyometric training was effective in promoting improvement in injury prevention variables. Doubling the volume of a horizontal plyometric training protocol was shown to have no additional effect over functional aspects of soccer players' performance.
authors.affiliation: a Faculty of Education and Sport , University of the Basque Country, UPV/EHU , Vitoria-Gasteiz , Spain.
authors.forename: Javier
authors.initials: J
authors.lastname: Yanci
authors.affiliation: a Faculty of Education and Sport , University of the Basque Country, UPV/EHU , Vitoria-Gasteiz , Spain.
authors.forename: Asier
authors.initials: A
authors.lastname: Los Arcos
authors.affiliation: a Faculty of Education and Sport , University of the Basque Country, UPV/EHU , Vitoria-Gasteiz , Spain.
authors.forename: Jesús
authors.initials: J
authors.lastname: Camara
authors.affiliation: a Faculty of Education and Sport , University of the Basque Country, UPV/EHU , Vitoria-Gasteiz , Spain.
authors.forename: Daniel
authors.initials: D
authors.lastname: Castillo
authors.affiliation: b Physical Performance Department , C.D. Tropezón , Torrelavega , Spain.
authors.forename: Alberto
authors.initials: A
authors.lastname: García
authors.affiliation: c Football Training and Biomechanics Laboratory , Technical Department, Italian Football Federation (FIGC) , Florence , Italy.
authors.forename: Carlo
authors.initials: C
authors.lastname: Castagna
mesh_terms: D000328:Adult; D001265:Athletic Injuries / Q000517:prevention & control; D054874:Athletic Performance / Q000502:physiology*; D006801:Humans; D008297:Male; D059385:Plyometric Exercise / Q000379:methods*; D012916:Soccer / Q000293:injuries / Q000502:physiology*; D013030:Spain; D055815:Young Adult
keywords: Acceleration; change of direction; horizontal strength; jump; training