Date of Award

Winter 2011

Document Type

Dissertation

Degree Name

Doctor of Philosophy (PhD)

Program/Concentration

Human Movement Sciences

Committee Director

Bonnie L. Van Lunen

Committee Member

James A. Ornate

Committee Member

Stacie Ringleb

Abstract

Insufficient muscular strength at the hip and thigh may increase an athlete's susceptibility to lower extremity injuries. In an attempt to reduce this risk, researchers have proposed lower limb strength testing within preparticipation physical examinations (PPE) and return-to-play (RTP) evaluations. However, because of cost, mobility, and or set-up time, some methods are not feasible in certain settings. Since methodological approaches between methods can vary, having different contraction modes and testing parameters, substitution of one method for another may not be valid. Therefore, the purpose of this study is three-fold: a) to determine the association between isometric and isokinetic contraction modes assessed at the hip, b) to investigate relationships between parameters of muscular strength, c) to assess the relationships between dynametric muscular strength and measures of functional performance.

For experiment one, eight-teen recreationally active individuals were recruited. In this experiment, separate Pearson product moment correlations were used to evaluate peak torque (PT) between modes. This experiment determined that the PT evaluated at the hip demonstrated a strong to very strong positive correlation (r =.50 - .87) between isometric and isokinetic evaluated at 60°/s, with the exception of normalized HE (r = .42) and IR (r = .24). For experiment two and three, 62 recreationally active participants were recruited. In experiment two and three, separate Pearson product-moment correlations were used to determine the association between the variables of interest. Experiment two determined that PT accounted for 78 to 98% of the variance in RTD. However, neither PT nor RTD demonstrated a similar relationship to strength endurance. Finally, experiment three, determined that work performed by participants during triple hop for distance (THD) accounted for more than 50% of the variance in absolute AB, AD, HE, HF, KE, and ER PT. In addition, the work performed during the THD also accounted for more than 50% of the variance in absolute AB and AD RTD. Overall, these three experiments indicate that in PPEs and RTP evaluations where tertiary methods might not be feasible, secondary and primary methods for evaluating muscle function may present a viable option for evaluating an individual's PT and or RTD.

DOI

10.25777/6hzt-sn65

ISBN

9781267108951

Included in

Kinesiology Commons

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