Mechanisms of control in hope jumping as a function of task constraint
Keywords:constraint, rope weight, adaptation, control
Hope jumping is a motor task that can be performed in different ways and with ropes with different physical characteristics (weight, texture, and size). When the rope jump is performed with the rope being self controlled, relevant haptic information is available for the action control. In order to examine the adjustments made by the performer in rope jumping with ropes of different weight, eight male university students performed a sequence of 30 rope-jumping with ropes of 180, 255, and 330g. The rope was turn by the participant in a selfpaced mode. Such sequences were registered in video and the following variables were obtained: continuous relative phase, rope beat frequency, jump height, rope height, and temporal interval between the moment of the loss of the feet contact with the floor and the crossing of the rope under the feet. The results showed that only the rope frequency changed as a function of the rope weight, suggesting that the upper limbs when turning the rope are responsible for the adjustments in order to maintain the same level of performance.
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