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The Journal of Sports Medicine and Physical Fitness 2000 March;40(1):26-34

lingua: Inglese

Reliability of jumping performance in active men and women under different stretch loading conditions

Arteaga R., Dorado C. *, Chavarren J. *, Calbet J. A. L. *

From the Department of Physics
* Department of Physical Education University of Las Palmas de Gran Canaria, Spain


Background. To deter­mine the reli­abil­ity of squat­ting ­jumps (SJ), coun­ter-move­ment ­jumps (CMJ) and ­drop ­jumps (DJ) ­tests, as ­well as the reli­abil­ity of the opti­mal drop­ping ­height dur­ing ­drop jump­ing.
Methods. Jumping per­for­mance was ­assessed in 8 ­male and 9 ­female phys­i­cal edu­ca­tion stu­dents. Their age, ­weight and ­height (x-±SD) ­were 23.9±2.1 ­years, 72.0±12.1 kg, 174.3±10.4 cm, and 23.1±2.0 ­years, 54.8±4.9 kg, 160.1±5.0 cm for the ­males and ­females, respec­tive­ly. The jump­ing per­for­mance was deter­mined on six dif­fer­ent test­ing ­days. On ­each test­ing day, squat­ting ­jumps (SJ) and coun­ter-move­ment ­jumps (CMJ) ­were per­formed as ­well as ­drop ­jumps (DJ) ­from ­heights ­between 20 and 100 cm. The drop­ping ­height giv­en the max­i­mum ­attained ­height was reg­is­tered as the opti­mal drop­ping ­height (ODH). After a 15 min ­rest peri­od, a 30 sec hop­ping ­test (HT) was per­formed and the ­mean ­height ­attained (MHT) as ­well as the num­ber of ­jumps exe­cut­ed (NHT) ­were record­ed. The ­height ­attained was com­put­ed ­from the ­flight ­time, ­which was meas­ured ­with a dig­i­tal tim­er (±0.001 sec) con­nect­ed to a resis­tive plat­form.
Results. The ­pooled coef­fi­cients of vari­a­tion in per­cent­age ­were 5.4 (SJ), 6.3 (CMJ), 6.2 (DJ), 31.9 (ODH), 3.1 (NHT) and 6.7 (MHT). A par­a­bol­ic rela­tion­ship ­between drop­ping ­height and ­attained ­height was ­found (r=0.39-0.43, p<0.001). The ODH was 48.2±14.0 cm and 62.9±21.3 cm for ­females and ­males, respec­tive­ly (p<0.05). Multiple regres­sion anal­y­sis ­showed ­than ODH can be pre­dict­ed ­from the SJ ­with a stan­dard ­error of 9 cm.
Conclusions. The var­i­abil­ity of the assess­ment of jump­ing per­for­mance is sim­i­lar to ­that report­ed for oth­er var­i­ables ­used in the assess­ment of phys­i­cal fit­ness. In con­trast, the assess­ment of the opti­mal drop­ping ­height is ­less reli­able.

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