Computational protocol: Changes in trunk posture and muscle responses in standing during pregnancy and postpartum

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Protocol publication

[…] An a priori analysis of effect and sample size was made for a desired power of 90%. Effect size was estimated by means of Cohen’s d, calculated from the results of published work which compared similar dependent variables (EMG activity of the trunk extensor muscles, lumbopelvic position in the sagittal plane) between pregnant and non-pregnant women [,]. Sample size was calculated using the G*Power 3 software []. The result was an estimated minimum sample size of 32 subjects per group.Compliance with the assumption of normality was checked for each dependent variable and each study group by means of the Kolmogorov-Smirnov test. In order to check the homogeneity in age and height between the control and pregnancy groups, a Student t-test for independent samples was used, with an alpha level of 0.05. Differences between the control and pregnancy groups, both ante and postpartum, were also analysed by means of the Student t-test for independent samples. Differences between measurements in pregnant women before and after childbirth were analysed by means of the Student t-test for related samples. To avoid the inflation of type I error due to repetition of pairwise comparisons, a Bonferroni adjustment was applied to the level of significance of these three comparisons (control vs postpartum, control vs antepartum and antepartum vs postpartum). Thus the alpha level for these three comparisons was 0.05/3, that is, 0.016. SPSS version 18.0 for Windows (SPSS Inc, Chicago, IL, USA) was used for all analysis. […]

Pipeline specifications

Software tools G*Power, SPSS
Application Miscellaneous
Organisms Homo sapiens