GROUND REACTION FORCE AND PLANTAR PRESSURE OF TWO JUMPING HEAD-OUT AQUATIC EXERCISES

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The aim of this study was to compare the biomechanical load, measured by the vertical ground reaction force (GRF), plantar pressure, and contact area of two jumping head-out aquatic exercises (cross country ski and jumping jacks) performed at 1.30 m water depth. Ten healthy male volunteers, with mean (SD) age 26.5 (4.2) yr, height 175.8 (2.6) cm, weight 73.7 (8.5) kg, body mass index 22.3 (2.5) kg.m-2 participated in this study. Data from both GRF and plantar pressures were obtained by using an insole system. Pairedsamples t-tests were conducted to compare each variable between conditions. Significant differences between exercises were found in all variables (peak force, t(9)=2.52, p = 0.033; peak pressure, t(9)=2.41, p = 0.040 and contact area, t(9)=-2.60, p = 0.029). Jumping exercises can be a suitable option when prescribing water-based exercises.