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The Journal of Sports Medicine and Physical Fitness 2001 September;41(3):342-8


lingua: Inglese

Effects of plyometric training followed by a reduced training programme on physical performance in prepubescent soccer players

Diallo O., Dore E., Duche P., Van Praagh E.

From the UFR STAPS, Laboratoire de Biologie des Activités Physiques et Sportives Université Blaise Pascal, Aubière Cedex, France


Background. In ­adult pop­u­la­tion, ­stretch-short­en­ing ­cycle exer­cise (plyo­met­ric exer­cise) is ­often ­used to ­improve leg mus­cle pow­er and ver­ti­cal ­jump per­for­mance. In chil­dren, lim­it­ed infor­ma­tion regard­ing ­this ­type of exer­cise is avail­able. The pur­pose of ­this ­study was to exam­ine the effec­tive­ness of plyo­met­ric train­ing and main­te­nance train­ing on phys­i­cal per­for­manc­es in prep­u­bes­cent soc­cer ­players.
Methods. Twenty ­boys ­aged 12-13 ­years was divid­ed in two ­groups (10 in ­each): jump group (JG) and control group (CG). JG ­trained 3 ­days/­week dur­ing 10 ­weeks, and per­formed var­i­ous plyo­met­ric exer­cis­es includ­ing jump­ing, hur­dling and skip­ping. The sub­se­quent ­reduced train­ing peri­od last­ed 8 ­weeks. However, all sub­jects con­tin­ued ­their soc­cer train­ing. Maximal ­cycling pow­er (Pmax) was cal­cu­lat­ed ­using a ­force-veloc­ity ­cycling ­test. Jumping pow­er was ­assessed by ­using the fol­low­ing ­tests: countermovement jump (CMJ), squat jump (SJ), drop jump (DJ), multiple 5 ­bounds (MB5) and repeated rebound jump for 15 sec­onds (RRJ15). Running veloc­ities includ­ed: 20, 30 and 40 m (V20, V30, V40 m). Body fat per­cent­age (BF%) and ­lean leg vol­ume ­were esti­mat­ed by anthro­pom­e­try.
Results. Before train­ing, ­except for BF%, all base­line anthro­po­met­ric char­ac­ter­is­tics ­were sim­i­lar ­between JG and CG. After the train­ing pro­gramme, Pmax (p<0.01), CMJ (p<0.01), SJ (p<0.05), MB5 (p<0.01), RRJ15 (p<0.01) and V20 m (p<0.05), per­for­manc­es ­increased in the JG. During ­this peri­od no sig­nif­i­cant per­for­mance ­increase was ­obtained in the CG. After the 8-­week of ­reduced train­ing, ­except Pmax (p<0.05) for CG, any ­increase was ­observed in ­both ­groups.
Conclusions. These ­results dem­on­strate ­that ­short-­term plyo­met­ric train­ing pro­grammes ­increase ath­let­ic per­for­manc­es in prep­u­bes­cent ­boys. These improve­ments ­were main­tained ­after a peri­od of ­reduced train­ing.

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