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Original articles  

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

language: English

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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