No description available.

The present study quantifies electromyographic variables in one and two degree of freedom elbow movements involving flexion/extension and pronation/supination, in order to understand the associated central commands. Agonist burst magnitude varied with motion in a second degree of freedom for some muscles but not for others. In movements for which a biarticular muscle acted as agonist in two degrees of freedom, agonist burst magnitudes were approximately the sum of the magnitudes in the component movements. Agonist burst magnitude varied with motion in a second degree of freedom for some, but not all, monoarticular muscles. When biarticular muscles acted as agonist in one degree of freedom and antagonist in the other, the muscle often displayed both components simultaneously. The additivity of EMG burst magnitudes in two degree of freedom movements and the presence of both agonist and antagonist bursts in a muscle suggest that central commands associated with motion in individual degrees of freedom are superimposed in producing two degree of freedom movements.

The purpose of this study was to devise a simple mechanical power formula for both peak and average power using a countermovement jump and reach test for both college male and female athletes. Forty-nine female and 69 male athletes were measured for height, weight, thigh circumference, thigh skinfold, upper leg length, and lower leg length. The athletes performed a countermovement jump and reach test off of a force platform. A Vertec jumping apparatus was used to measure vertical jump height and the force platform was used to acquire force/time data to determine actual peak and average power output. Eight anthropometric measurements, vertical jump height, and gender were the variables presented to develop the equations. A stepwise multiple regression statistical procedure was used to develop the prediction equations. Vertical jump height, mass, and body height were the significant (p<.05) variables loaded into both peak and average mechanical power prediction equations. Gender was not significant (p>.05) and, therefore, not loaded into either equation. Predicted peak power and actual peak power values were 4,707 t 1,511 and 4,687 ± 1,612 watts, respectively. Predicted averagepower and actual average power values were 2,547 ± 760 and 2,463 ± 753 watts, respectively. The following best model regression-derived equations produced R2 values of .91 for peak power and .82 for average power:Peak Power (W) = 78.47 • VJ (cm) + 60.57 • Mass (kg) - 15.31 • Ht (cm) - 1,308 Average Power (W) = 41.41 • VJ (cm) + 31.18 • Mass (kg) - 13.86 • Ht (cm) + 431 Results of this study conclude that the two regression equations are good predictors of peak and average mechanical power output. / School of Physical Education

No description available.

The purpose of this study was to describe various kinematic variables of the skating stride. A data set for five collegiate hockey players was completed (mean +/- SD: age = 22.0 +/- 1.0 years, height = 1.77 +/- 0.06 m, weight = 80.0 +/- 8.5 kg). Three velocities were examined on the skating treadmill: slow (12 km/hr), medium (18 km/hr) and fast (24 km/hr). Electrogoniometers at the hip (H), knee (K) and ankle (ANK) were used to acquire angular displacement and velocity profiles. A trend for increasing range of motion and a significant (p < 0.05) increase in stride rate was observed with speed. Movement patterns between subjects were consistent for the H and K with some variations at the ANK. The study concluded that skating speed was controlled by stride rate while movement profiles remained unchanged.

Thesis (Ph. D.)--Biomedical Engineering, Georgia Institute of Technology, 2007. / Committee Chair: Ting, Lena H.; Committee Member: Chang, Young-Hui; Committee Member: Lee, Robert H.; Committee Member: Nichols, T. Richard; Committee Member: Wolf, Steve L.

Thesis (Ph. D.)--University of Sydney, 2001. / Includes tables. Title from title screen (viewed Apr. 22, 2008). Submitted in fulfilment of the requirements for the degree of Doctor of Philosophy to the School of Physiotherapy, Faculty of Health Science. Includes bibliography. Also available in print form.

Thesis (Ph.D.)--Victoria University (Melbourne, Vic.), 2008.

Thesis (M.S.)--Brock University, 2007. / Includes bibliographical references (leaves 79-84).

Thesis (M.S.B.M.E.)--Baylor University, 2008. / Includes bibliographical references (p. 77-78)