Background and Purpose: Self-efficacy plays a major role in determining physical function during the earlier stages of the knee osteoarthritis (OA) and it may be a significant factor in the maintenance of physical function across the span of OA severity. This study examined the contribution of self-efficacy to objective and subjective measures of physical function at both maximal and sub-maximal levels. The relationship between self-efficacy and quality of life was also examined.
Participants: Twenty community-dwelling adults with knee OA (age 69±14 years) were recruited for this study.
Methods: Subjective maximal and sub-maximal performance were determined using the Maximal Activity Score (MAS) and Adjusted Activity Score (AAS) respectively of the Human Activity Profile. The objective measure of sub-maximal physical function was the 6-minute walk test (6MWT) while the Incremental Shuttle Walk Test (ISWT) was the maximal measure. Quality of life was determined using the Short Form Health Survey 36 (SF-36) and self-efficacy was measured using the Arthritis Self-Efficacy (ASE) scale. Disease severity was determined using the Western Ontario and McMaster University Osteoarthritis Index (WOMAC). A stepwise multiple linear regression analysis was performed using each of 6MWT, ISWT, AAS and MAS as the dependent variable, and the WOMAC and ASE as independent variables.
Results: Self-efficacy explained 44% of the variance in the 6MWT but only 16% in the ISWT. Self-efficacy explained approximately 30% of the variance in both the MAS and AAS. A moderate relationship was observed between self-efficacy and the Physical Component Score (PCS) (r=0.51) of health-related quality of life, but no relationship was observed with the Mental Component Score (MCS).
Discussion and Conclusion: In mild to moderate knee OA, sub-maximal physical function was substantively influenced by an individual’s belief in his/her ability to perform a given task, but not so when the intensity of the activity approached maximal levels. This differential relationship between sub-maximal and maximal performance was not present using subjective reports of performance. These findings indicate that therapy utilizing training at sub-maximal levels in mild to moderate knee OA should focus on strategies for enhancing self-efficacy; whereas with training at relatively high intensities, less focus should be given to enhancing self-efficacy. / Thesis (Master, Rehabilitation Science) -- Queen's University, 2008-04-25 15:28:10.666
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:OKQ.1974/1180 |
| Date | 28 April 2008 |
| Creators | Sadiq, Abdul K. Jafar |
| Contributors | Queen's University (Kingston, Ont.). Theses (Queen's University (Kingston, Ont.)) |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English, English |
| Detected Language | English |
| Format | 658440 bytes, application/pdf |
| Rights | This 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. |
| Relation | Canadian theses |
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