Dissertation/Thesis Abstract

Knee Valgus Differences throughout a Chair Twist Pose between Novice and Experienced Yoga Participants
by Cooper, Christina Nicole, M.S., California State University, Long Beach, 2019, 57; 22585249
Abstract (Summary)

The purpose of this study was to investigate knee valgus differences throughout a chair twist pose between novice and experienced yoga participants. Knee valgus refers to the shank angled outward causing knee abduction angle and knee internal rotation. Participants performed the chair twist pose with four distinct events analyzed, standing, knee flexion: pre-twist, peak trunk rotation, and knee flexion: post-twist. Sixteen healthy females, 8 novices (1.5 ± 0.5 months’ experience) and 8 experienced 48.0 ± 36.0 months’ experience) volunteered to participate in the study. Group demographic data were novice age 24.7 ± 4.6, yrs.; height 1.6 ± 4.9, m; mass 64.3 ± 13.2, kg; and experienced age 26.1 ± 3.4, yrs.; height 1.7 ± 4.8, m; mass 66.6 ± 4.6, kg. An informed consent form was signed by each participant. Calibration static markers were placed on the participant, then a static trial was performed and then immediately after calibration static markers were removed. The participant then performed three sets of three trials with at least thirty seconds rest between each set. Each trial consisted of a twist only to the left or right, depending on the participant’s dominant leg. All data were collected using Qualisys Track Manager and force plates. All statistical analyses were performed with R program version 3. 5. 3. Repeated-measures analysis of variance (RMANOVA) two-tailed test was conducted to analyze knee differences in a chair twist pose between novice and experienced yoga participants. Tukey Honest Significant Differences were used to examine the pairwise comparisons. A Pearson product-moment correlation coefficient was computed to assess the relationships between lateral shear forces at the knee and degree of knee abduction and the relationship between anterior shear forces at the knee and degree of knee abduction moments. There was not a significant (p = 0.22) difference in knee abduction angle in the chair twist movement between novice (L1) and experienced (L2) participants. There was not a significant (p = 0.42) difference in knee internal rotation the chair twist movement between L1 and L2. There was a strong (r = 0.82) and significant (p = 0.01) relationship between standing lateral shear forces and standing knee abduction in L1. All other events demonstrated both weak and non-significant relationships between lateral shear forces and knee abduction angles. There was not a strong nor significant relationship between anterior shear force and knee abduction moments during chair twist movement in L1. During the chair twist movement, L2 did display a strong (r = 0.70) but non-significant (p = 0.5) relationship between anterior shear force and knee abduction moments. These results suggest that the relationship between lateral shear forces at the knee and knee abduction angles are present; however, future research is needed to further investigate knee deviation angle difference in yoga participants.

Indexing (document details)
Advisor: Crussemeyer, Jill A.
Commitee: Valenzuela, Kevin, Irby, Steven
School: California State University, Long Beach
Department: Kinesiology
School Location: United States -- California
Source: MAI 81/3(E), Masters Abstracts International
Source Type: DISSERTATION
Subjects: Biomechanics
Keywords: Internal rotation, Knee abduction angle, Knee abduction moments, Knee deviations, Knee valgus, Yoga
Publication Number: 22585249
ISBN: 9781088348437
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