Measurement of specific movement power application: evaluation of weight lifters

Abstract

A new dynamometer was developed for the measurement of specific movement power (SMP) exerted by mono- or multi-articular movements. To determine the reproducibility of SMP, two identical test protocols were carried out on separate days for six movement types on seven adult males. The movement types were arm pull (AP), leg rise (LR), knee extension (KE), elbow flexion (EF), hip extension (HE) and squat movement (SQ). Variations in peak power obtained in two tests ranged from 0.7% (AP) to 9.6% (SQ). Coefficients of the test-re-test correlation in peak power ranged from 0.805 (SQ) to 0.961 (AP) and standard errors ranged from 4 W (EF) to 14 W (SQ). SMP in upper extremities increased from 166 W (EF) to 307 W (AP) resulting from the increase in velocity. However, in the movements of lower extremities, SMP increased from 506 W (KE) to 1351 W (SQ) as a result of the increase in force. To evaluate the validity of the SMP, a pull movement in weightlifting was tested and related to the athletic performance on weightlifters. Positive linear correlation (r = 0.862, p<0.001) was observed between SMP and the total weight best records. It is concluded that this newly developed dynamometer has enough reproducibility and validity for evaluating the SMP, which is developed by various joint movement patterns related to the sport. The feasibility of applying this measuring protocol to the testing and training programmes for improving the daily living activities and athletic performances should now be assessed.

The concept of iso-inertial assessment: Reproducibility analysis and descriptive data

“…The description of our results provides information about BP and SQ load-power and load-velocity relationships among recreational sportsmen. The load-velocity relationships respected classical profile already observed in iso-inertial [6,7,15,19,24,31] and isokinetic [3,10,11,26,33,40] evaluations. The improvement in velocity accompanying the diminishment of loads has been attributed to an increase in the rate of cross-bridge attachdetach cycle, which equates to less time to generate tension for force production [15].…”

Évaluation inertielle : état de la question et perspectives

“…Ces épreuves, toujours limitées aux membres inférieurs, n'apprécient cependant jamais ni la vitesse gestuelle, ni la force maximale. Les mesures les plus fréquentes concernent les valeurs moyennes et maximales de la vitesse, de la puissance ou encore de la force [7,18,22,29,49,55]. Le temps nécessaire pour atteindre la vitesse ou la puissance maximale est également utilisé comme paramètre de l'explosivité [22,29].…”

Acute Effect of Static Stretching on Power Output During Concentric Dynamic Constant External Resistance Leg Extension

“…This machine controlled the load of a wire uniformly with an electro-magnetic disk brake. The tension and velocity when the wire was pulled were recorded by the strain gauge and the rotary encoder attached to the axis of inertia wheel mounted in the Power Processor (16,17). Electrical signals from load cell and rotary encoder were stored on a personal computer at a sampling frequency of 500 8 Hz.…”