EFFECT OF ADDED WEIGHTS ON JOINT ACTIONS IN VERTICAL JUMP

Cinematographic records were taken of 17 males during the performance of the vertical jump under four conditions of weighting; namely: No additional weight, and additions of 6, 12, and 18 pounds. Decreases in maximal angular velocity and increases in range of motion and time of the joint actions of the hip, knee, and ankle were noted with increasing amounts of weight. Significant decreases were obtained in the V/t ratio at the hip and knee joints with increasing amounts of weight. If one assumes a constant available force, these adjustments are consistent with an increase in mass (weight) according to the formula F = m V/t. © 1968 Taylor & Francis Group, LLC.