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| Author(s): |
Monica Yuri Takito
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Faculdade de Saúde Pública (FSP/CIR) |
| Defense date: | 2001-12-03 |
| Examining board members: |
Maria Helena D'Aquino Benicio;
Maria do Rosário Dias de Oliveira Latorre;
Jose Eduardo Cajado Moncau
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| Advisor: | Maria Helena D'Aquino Benicio |
| Abstract | |
Objetives: To analyse the relationship between maternal physical activity/standing posture and inadequate birthweight. Methods: A prospective cohort study of pregnant women attending a low risk antenatal clinic directed the underprivileged socio-economical population was undertaken. The loss of eligible pregnant women during follow-up was of 30.9%, 152 pregnant women and newborn children remaining in the cohort. The data were obtained from interviews with the pregnant women held in the antenatal service during three different periods during pregnancy. The physical activity measured inc1uded all daily activities (housework, job activity, recreation and physical exercise). To quantify its intensity a classification proposed by NRC (1989) was used. Maternal posture was studied using the variable standing time, every activity that required standing, and then each one of these activities was assessed separately. The dependent variable was birthweight categorized as inadequate (<3000 g) or adequate (≥ 3000 g). The influence of the factors involved in the study of the dependent variable was assessed by logistic regression analisys. The adjustable variables were: smoking, initial nutritional status, stable cohabitation with partner and schooling Results: There was no statistically significant difference between the cohort of pregnant women and 10ss in follow up. Factors of protection against inadequate birthweight were identified as being the maintenance of daily activity, specifically walking less than fifty minutes (OR adjusted=0.44, CI95%:0.20-0.98 and light cleaning activities three or more times a week (OR adjusted =0.49, CI95%:0.25- 0.96), in the first period of pregnancy. No association was found between intensity of physical activity and birthweight. The risk of inadequate birthweight associated with standing posture maintained for more than 2½ hours, showed an increase in the second trimester (OR adjusted=3.23, CI95%:1.30-7.99). A dose-response relation among activities that called for a standing posture; the washing of clothes and cooking was found with a linear trend p<0.01 and 0.05, respectively. Only the washing of clothes in the 2nd period had its statistical significance confirmed. Conclusions: Walking and doing \"light\" house cleaning showed a protection effect in the first period of pregnancy. The evidence showed that, in the second trimester of pregnancy, maternal posture (standing) had an influence on inadequate birthweight, particular related to brief of washing of clothes. These results justify the need for further study with larger sample sizes to identify possible associations among, low birthweight, intrauterine growth retardation and prematurite birth. (AU) | |