Associations Between 24 H Movement Behaviors and Body Weight in Postpartum Women: An Isotemporal Substitution Model...

Area of Science:

• Reproductive Health
• Exercise Physiology
• Public Health

Background:

• Limited data exist on dynamic changes in daily movement behaviors (sleep, physical activity, sedentary time) and their impact on postpartum body weight.
• Understanding these associations is crucial for maternal health and well-being in the first year after childbirth.

Purpose of the Study:

• To investigate how reallocating time between different movement behaviors (sleep, moderate-to-vigorous physical activity [MVPA], light physical activity [LPA], sedentary time [SED]) affects body weight in postpartum women.
• To examine these associations at different time points within the first year postpartum.

Main Methods:

• 86 women were included, with physical activity and sleep measured via actigraphy at early, mid-, and late postpartum.
• Body weight was recorded at each timepoint.
• Isotemporal substitution models analyzed the impact of reallocating 10 minutes between behaviors on body weight.

Main Results:

• Sedentary time constituted the largest proportion of daily activity (~52-53%), followed by sleep (~30%), LPA (~12-13%), and MVPA (~2%).
• Reallocating 10 minutes from MVPA to LPA, SED, or sleep was associated with lower body weight in early and mid-postpartum.
• Shifting 10 minutes from SED to LPA was linked to reduced body weight in early and late postpartum.

Conclusions:

• Promoting light physical activity (LPA) postpartum may aid weight loss.
• Sufficient sleep appears particularly important for weight management in early to mid-postpartum.
• Further research is needed to establish postpartum-specific 24-hour movement guidelines.