Towards an understanding of change in physical activity from pregnancy through postpartum

Abstract

Objective The purpose of this paper was to describe the rationale, data collection, and proposed analyses for examination of mediators of change in physical activity from pregnancy to postpartum among a cohort of pregnant women. Method The Pregnancy Infection and Nutrition 3 (PIN3) Study enrolled 2006 pregnant women into the cohort from 2001 to 2005. All women lived in central North Carolina upon enrollment. Physical activity was assessed using a self-reported one week recall, measured twice during pregnancy and once each at 3- and 12-months postpartum. On a subset of women, one-week accelerometer measures were also collected during the two postpartum time periods. Potential mediators (intrapersonal, interpersonal, community) were collected during pregnancy and postpartum through interviews and take home questionnaires. Results To assess mediation of physical activity among our cohort, we will first describe change in physical activity and the mediators, as well as their associations, through pregnancy into the postpartum period. Following this, the product of coefficients approach will be applied to examine whether each measure had indirect effects on change in physical activity. Each individual level mediator will be examined one at a time and across the time points in which it was available. The Sobel standard error approximation formula will be used to test for significance of the mediation effect. Conclusions This study will provide evidence to develop appropriate interventions targeted at physical activity and will help focus efforts on the appropriate time periods between pregnancy and postpartum.

Physical Activity Beliefs, Barriers, and Enablers among Postpartum Women

“…An explanation for how these variables were assessed is available at the study website (www.cpc.unc.edu=pin) and elsewhere. 34 …”

Impact of accelerometer wear time on physical activity data: a NHANES semisimulation data approach

“…Some researchers report valid days based on a percentage of time awake ranging from 60%13 to 75%4 of awake time. Still others recommend using sample-specific criteria that may change based on the amount of time a specific sample wore the accelerometer 9 18. For example, Catellier et al 9 proposed the 70/80 rule which requires 70% of the sample to have accelerometer data and 80% of that observed period becomes the valid day threshold.…”

Nivel de actividad física según GPAQ en mujeres embarazadas y postparto que asisten a un centro de salud familiar

“…La AF en la mujer embarazada ha sido estudiada, entre otros métodos, a través de cuestionarios generales como IPAQ, GPAQ y KAYSER (7-15) y cuestionarios específicos de esta población como PPAQ y PAQ (16)(17)(18)(19)(20)(21)(22). El objetivo ha sido determinar el nivel de AF y conducta sedentaria realizado por la mujer en las distintas dimensiones del movimiento humano, describiendo las variaciones presentadas durante el período de gestación.…”