Date of Award

5-2007

Document Type

Restricted Access Thesis

Degree Name

Master of Science in Athletic Training

Department

Department of Athletic Training

Thesis Advisor

Marjorie A. King

Committee Member

Erik E. Swartz

Committee Member

Joseph Hamill

Abstract

Objective: To determine whether there is a sex difference in Continuous Relative Phase (CRP) and its variability during a drop jump and two different unplanned cutting maneuvers. Design and Setting: A repeated measures one session design was used. A 2 x 3 mixed factorial (sex by task) ANOVA was performed on the subjects’ means for CRP for five deemed acceptable trials for each task yielding the Mean Absolute Relative Phase (MARP). The standard deviation was calculated to reflect between trial variability resulting in the Deviation Phase (DP) variable. Based on the stance phase, a 2 x 3 repeated measures ANOVA (sex, task) was analyzed for two CRP coordinative relationships: knee rotation and foot inversion/eversion (Krot-Fooin/ev); hip abduction/adduction and foot inversion/eversion (Habd/add-Fooin/ev). Subjects: Seven males and six females (N = 13) non-injured collegiate basketball athletes participated in the study. Measurements: The MotionMonitor™ (Innovative Sports Training, Chicago, IL) was used to obtain kinematic data used in the data processing to obtain CRP. Subjects performed a drop jump and two different unplanned 45 ̊ cutting maneuvers (freely moving their arms and grabbing a ball respectively). Results: No significant (Habd/add-Fooin/evp = .736; Krot-Fooin/ev: p = .793) differences were found between sex in any of the coordinative relationships for MARP nor for DP. No significant (Habd/add-Fooin/evp = .304; Krot-Fooin/ev: p = .053) differences were found between tasks in any of the coordinative relationships for the for DP. Conclusions: While for the Krot–Fooin/ev relationship the more complex the tasks were, the more variability subjects showed, this phenomenon was not observed for the Habd/add-Fooin/ev relationship. Upon closer review, it was revealed that there was increased variability seen in the women in the least complex of the tasks, Task A (drop jump). This may be the manifestation of the suggested lack of neuromuscular control of the hip and core muscles resulting in the large variability observed. In this instance, variability may be counter productive and a predisposing factor for injury.

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