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The effect of drop height and body mass on drop jump intensity

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Author(s): H Makaruk | T Sacewicz

Journal: Biology of Sport
ISSN 0860-021X

Volume: 28;
Issue: 1;
Start page: 63;
Date: 2011;
Original page

Keywords: stretch-shortening cycle | plyometric exercises | depth jumps | ground reaction forces | Rate of Force Development

ABSTRACT
Given the nature of plyometric exercises (which overload muscles and joints), intensity control plays an important role in training. Therefore, the aim of this study was to determine the effect of drop height and mass changes on exercise intensity expressed through ground reaction forces (GRF) and the rate of eccentric force development (E-RFD). Nine elite male athletes representing 1st league athletics clubs volunteered to serve as subjects for the study. They performed unloaded and loaded drop jumps from 0.2 m, 0.4 m and 0.6 m. As for loaded jumps, loads constituted 5% and 10% of body mass (BM). It was observed that with an increase in drop height, the values of ground reaction forces at the first peak (the contact of toes with the ground; GRF1) and at the second peak (the contact of heels with the ground; GRF2) as well as the values of E-RFD1 (measured from 0 to GRF1) and E-RFD2 (measured from 0 to GRF2) increased significantly (P
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