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Influence of increased rotational inertia on the turning performance of humans

David V. Lee, Rebecca M. Walter, Stephen M. Deban and David R. Carrier^*

Department of Biology, 201 South Biology Building, University of Utah, Salt Lake City, UT 84112, USA

View larger version (21K): [in a new window]   Fig. 1. Sample recordings of the ground reaction torque (A) and angular power (B) applied during maximum-effort jump turns by subject ‘B’. The thick lines denote the recording obtained when the subject turned with his rotational inertia elevated 9.7-fold (Table 1) above that of the weight-controlled jump (shown by the thin line). Note that subject B did more angular work (i.e. area under the angular power curves) in the increased rotational inertia trials than in the control trials (Table 5).

View larger version (18K): [in a new window]   Fig. 2. Mean vertical force (A) and the vertical impulse (B) applied to the force plate by the six subjects during maximal-effort vertical jumps and maximal-effort jump turns. In the vertical jump trials, the subjects did not attempt to turn. In the jump turns trials, the subjects attempted to turn as far as possible as they jumped. In each case, the three columns represent jumping unencumbered (U), jumping with the control weight (W) and jumping with the increased rotational inertia (I). Values are means ± S.D.