Health research has demonstrated that regular leisure-time physical activity
(LTPA) during pregnancy and the postnatal period may play a crucial role in managing the physical and psychological challenges that women face during these times of transition. The purpose of this dissertation was to investigate LTPA patterns during pregnancy and in the postnatal period and identify social-cognitive correlates associated with regular LTPA. Three inter-related studies were conducted.
The purpose of Study 1 was to conduct an in depth month-to-month investigation of LTPA from 3 months prior to conception to 7 months following childbirth. An assessment of 309 pre and postnatal women revealed that LTPA started to decline in the first trimester of pregnancy, continued to decline at a steady rate until childbirth and then
increased during the postnatal period. In addition to illustrating the average growth curve, the results from the multi-level moding analyses indicated substantial individual variability around the average growth curve. Future research should identify social cognitive factors that are associated with LTPA during this time of transition.
Accordingly, Study 2 investigated psychosocial correlates of LTPA during
pregnancy. The study engaged pregnant women in the listing of salient barriers to LTPA at 4 different time points during pregnancy (e.g., pregnancy weeks 18, 24, 30 and 36) and examined if barrier self-efficacy as well as a general measure of exercise self-efficacy were associated with LTPA during pregnancy. A total of 1168 barriers were content analyzed, yielding nine major themes. Hierarchical regression analyses supported both
forms of self-efficacy as predictors of LTPA. While Study 2 examined LTPA during pregnancy, Study 3 focused on the postnatal period. The first objective was to identify postnatal women's perceived LTPA barriers and outcome expectations. In general, the barriers reported were consistent with
barriers experienced by both asymptomatic and symptomatic populations as well as previous research examining barriers to exercise among postnatal women. The results of the open-ended outcome expectation elicitation generated a large number of physical, psychological and social outcome expectations. Approximately 90% of all outcome expectations listed under each category were classified into four groups. The second objective of Study 3 was to examine if outcome expectation likelihood, exercise self-efficacy
and barrier self-efficacy were associated with LTPA. In support of our
hypothesis, and consistent with social cognitive theory, self-efficacy was significantly associated with LTPA.
For many women engaging in regular LTPA during pregnancy and following the birth of a child is a challenge. The average growth curve results from Study 1 are promising; however the random effects analyses was significant indicating substantial individual variability about the average growth curve. Study 2 and Study 3 identified a number of salient barriers to LTPA which may hinder the initiation and maintenance of regular LTPA. Study 3 also identified salient outcome expectations that may severe a
motivational factors to engage in LTPA. The results suggest that self-efficacy represents an important social cognition is linked to higher levels of LTPA in the postnatal period. In conclusion, barrier and exercise self-efficacy may be important targets for intervention efforts to promote LTPA during pregnancy. / Thesis / Doctor of Philosophy (PhD)
| Identifer | oai:union.ndltd.org:mcmaster.ca/oai:macsphere.mcmaster.ca:11375/16543 |
| Date | 09 1900 |
| Creators | Cramp, Anita Grace |
| Contributors | Bray, Steven, Kinesiology |
| Source Sets | McMaster University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis |
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