Show simple item record

dc.contributor.advisorKilby, Jeff
dc.contributor.advisorBoocock, Mark
dc.contributor.authorJaralla, Alaa
dc.date.accessioned2019-09-10T00:23:20Z
dc.date.available2019-09-10T00:23:20Z
dc.date.copyright2019
dc.identifier.urihttp://hdl.handle.net/10292/12806
dc.description.abstractThis research examined the phasic differences of the lower extremities for a repetitive lifting task using two relative phase techniques, Discrete Relative Phase and Continuous Relative Phase. Both were calculated using the knee and hip angular positions along with their angular velocities in the sagittal plane. Further investigation was carried out using Vector Coding and Principal Component Analysis of the knee and hip angular positions. Discrete relative phase displayed information of the coupling relationship between the two joints when the distal joint was assessed relative to the proximal joint. The results showed that up to and including the 4th lift the coupling angle of the participants executed an ideal lifting posture where the hip extension leads the knee extension for the entire lifting cycle. For lifts 5 to 21, the participants displayed a distinct phasic difference. From approximately 50% to 100% of the remaining lifting cycle, the knee extension leads the hip extension for the remainder of the cycle. Continuous relative phase analysis used the angular positions and velocities, which was performed using the raw values or normalizing (+/-1) the raw values. It was found that in normalizing the raw values, temporal information was lost compared to using the raw values. The analysis of raw values showed information consistent with the discrete relative phase analysis, but the continuous relative phase is considered as a higher-order interpretation due to the addition of assessing both angular position and velocity of the two joints of interest. The results from continuous relative phase analysis showed that participants performed what could be referred to as an ideal lifting posture from lift 1, up to and including lift 4, where the hip extension leads the knee extension for the entire lifting cycle. From lifts 5 to 21, continuous relative phase displayed a phasic shift from approximately 50% of the lifting cycle to 100%. The knee extension would then lead the hip extension during the lifting cycle. Vector coding procedure was used to compute relative phase plots of both the knee and hip joint angular positions. Vector coding procedure displayed unsatisfactory results relating to the assessment of fatigue, due to the results outputting the direction and magnitudes of frame-to-frame vectors, and therefore, valuable temporal information for the entire cycle is lost. The Principal Component Analysis used the correlation matrix, which produced similar results to discrete relative phase and continuous relative phase. A comprehensive prediction can be made about the two principal-components, which makes up approximately 85% of the variation of the participant's knee and hip angular positions across the 21 lifting cycles. Although the results for one participant yield tangible outcomes, further analysis will be required when applying principal component analysis to several participants and would likely include cluster analysis of the results. In summary, both relative phase methods yielded the best results for the interpretation of differences in phasic patterns relating to fatigue in multicyclic behaviour. Continuous relative phase provides a higher-order analysis of the results, which provided both continuous spatial and temporal information relating to the two joints of interest.en_NZ
dc.language.isoenen_NZ
dc.publisherAuckland University of Technology
dc.subjectPhasic Patternsen_NZ
dc.subjectBio-mechanical Engineeringen_NZ
dc.subjectData Processingen_NZ
dc.subjectKinematic Dataen_NZ
dc.subjectRelative Joint Anglesen_NZ
dc.subjectDiscrete Relative Phaseen_NZ
dc.subjectDRPen_NZ
dc.subjectContinuous Relative Phaseen_NZ
dc.subjectCRPen_NZ
dc.subjectBio-mechanical Data Seten_NZ
dc.subjectPhase Angleen_NZ
dc.subjectMatlaben_NZ
dc.subjectVector Codingen_NZ
dc.subjectPrincipal Component Analysisen_NZ
dc.subjectPCAen_NZ
dc.subjectVector Matrixen_NZ
dc.subjectCovariance Matrixen_NZ
dc.subjectCorrelation Matrixen_NZ
dc.subjectOrthogonal Decompositionen_NZ
dc.titleInvestigation of Differences in Phasic Patterns During a Multicyclic Fatiguing Tasken_NZ
dc.typeThesisen_NZ
thesis.degree.grantorAuckland University of Technology
thesis.degree.levelMasters Theses
thesis.degree.nameMaster of Engineeringen_NZ
dc.rights.accessrightsOpenAccess
dc.date.updated2019-09-09T22:30:36Z


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record