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dc.contributor.authorSheppard, Phillip S.en
dc.date2012-09-30 18:43:50.997
dc.date2012-10-03 21:10:11.889
dc.date.accessioned2012-10-04T18:10:54Z
dc.date.available2012-10-04T18:10:54Z
dc.date.issued2012-10-04
dc.identifier.urihttp://hdl.handle.net/1974/7574
dc.descriptionThesis (Master, Kinesiology & Health Studies) -- Queen's University, 2012-10-03 21:10:11.889en
dc.description.abstractThe objectives of the present study were: 1) to determine if there is a sex-based difference in lifting technique across increasing load conditions; and, 2) to examine the use of body size-adjusted tasks and back strength-adjusted loads in the analysis of lifting technique. Eleven male and 14 female participants (n=25) with no previous history of low back pain participated in the study. Participants completed freestyle, symmetric lifts of a box with handles from the floor to table height for five trials under three load conditions (10%, 20%, and 30% of their individual maximum isometric back strength). Joint kinematic data for the ankle, knee, hip, and lumbar and thoracic spine were collected using a two-camera Optotrak 3020 system (NDI, Waterloo, ON). Joint angles were calculated using a three-dimensional Euler rotation sequence and PCA was applied to assess differences in lifting technique across the entire waveform. A repeated measures ANOVA with a mixed design revealed no significant effect of sex for any of the PCs. This was contrary to previous research that used discrete points on the lifting curve to analyze sex-based differences but agreed with more recent research using more complex analysis techniques. There was a significant effect of load on lifting technique for six PCs of the lower limb (p<0.005). However, there was no significant difference in lifting technique for the thoracic and lumbar spine. It was concluded that, when load is standardized to individual back strength characteristics, males and females adopted a similar lifting technique. In addition, as load increases participants used more of a semi-squat or squat lifting technique.en
dc.language.isoengen
dc.relation.ispartofseriesCanadian thesesen
dc.rightsThis publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner.en
dc.subjectPrincipal Component Eliminationen
dc.subjectPrincipal Component Analysisen
dc.subjectLifting Kinematicsen
dc.titleSex-Based Differences In Lifting Technique Under Increasing Load Conditions: A Principal Component Analysisen
dc.typethesisen
dc.description.degreeM.Sc.en
dc.contributor.supervisorStevenson, Joan M.en
dc.contributor.departmentKinesiology and Health Studiesen
dc.degree.grantorQueen's University at Kingstonen


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