Southern Cross University Study - Kangoo Jumps

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Normal Taining Shoes mean (SD) Kangoo Jumps mean (SD) Difference (%) mean(SD) Peak Force (BW) 2.62 (0.21) 2.85 (0.37) 1.07 (1) Mean Force (BW) 1.74 (0.14) 1.38 (0.12) -5.4 (9.3) 50 ms Impulse (BW.sec) 0.06 (0.012) 0.031 (0.008) -46.9 (14.8) Total Impulse (BW.sec) 0.385 (0.022) 0.448 (0.032) 16.5 (7.5) Time to Peak Force 0.103 (0.013) 0.152 (0.019) 24.2 (12.5) Contact Time 0.265 (0.03) 0.327 (0.032) 49.9 (24.8) Table 1: Impact forces and force time characteristics foot strike when wearing Kangoo Jumps vesrus normal training shoes. * indicates significant difference between normal shoes and the kangoo Jumps at the 0.01 level. PAGE 8
DISCUSSION The purpose of this study was to investigate the ground reaction force characteristics when jogging in a pair of Kangoo Jumps compared to normal training shoes. The results clearly show that the Kangoo Jumps result in considerably less impact forces being transferred To the lower limbs compared to the normal training shoes. In particular, the impulse over the first 50 ms following initial ground contact was reduced some 47 % which should translate into reduced risk of impact force induced injury as a result of jogging in the Kangoo Jumps. Figure 2 clearly shows that the contact phase is lengehened such that the forces are applied over a longer period of time. The force rises more gradually after impact and as can be seen for the representative subject, the impact spike is not observed in the Kangoo Jumps trial. Further, the time to achieve th peak force is increased. Overall, the impact of foot strike is considerably more gentle than that resulting from normal training shoes. The peak force was not significantly different between the two shoes and this was somewhat unexpected, particularly given that the contact time was lengthened suggesting that a lower overall force was being produced over greater time, requiring less magnitude of force. The overall force was lower as indicated by the lower mean force, however, the total vertical impulse was greater for the Kangoo Jumps. This indicates that the subjects may have adopted a more bouncing gait pattern with increased vertical oscillation between strides. Thus, the greater emphasis on vertical motion may help to explain the fact that the peak force was not significantly different. The effect of the Kangoo Jumps on normal gait patterns requires further investigation. This preliminary study shows promise for the use of Kangoo Jumps for low impact exercise such as recreational jogging and cross training for athletes. The uninjured person may be able to continue with a high volume of ground based activity without the impact injury risk inherent in their usual activity or sport. Further, there may be application of these shoes in rehabilitating patients with lower limb injuries. The patients could perform activities similar to normal running, recovering muscle strength, and maintaining cardiovascular fitness, but in a low PAGE 9
Page 1 and 2: UNIVERSITY STUDY REDUCING GROUND IM
Page 3 and 4: INTRODUCTION The current strategies
Page 5 and 6: impeding recovery or exacerbating t
Page 7: Data Analysis The force data were n

Southern Cross University Study - Kangoo Jumps

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