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Related Experiment Video

Updated: Aug 7, 2025

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Sibling Resemblance in Physical Activity Levels: The Peruvian Sibling Study on Growth and Health.

Carla Santos1,2, José Maia1, Sara Pereira1,2

  • 1Centre of Research, Education, Innovation and Intervention in Sport (CIFI2D), Faculty of Sport, University of Porto, 4200-450 Porto, Portugal.

International Journal of Environmental Research and Public Health
|March 11, 2023
PubMed
Summary

Sibling resemblance in physical activity (steps per day) was examined. While older siblings and sister-sister pairs took fewer steps, high-altitude and Amazonian environments were linked to increased daily steps, with no significant genetic or BMI influence found.

Keywords:
Perumultilevel modellingphysical activityshared factorssiblings

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Area of Science:

  • Human Genetics
  • Exercise Physiology
  • Environmental Health

Background:

  • Physical activity is crucial for health, influenced by genetics and environment.
  • Understanding sibling resemblance in physical activity is key to identifying contributing factors.
  • Previous research highlights the complex interplay of nature and nurture in health behaviors.

Purpose of the Study:

  • To quantify sibling resemblance in daily steps and moderate-intensity physical activity.
  • To explore how individual traits and shared environments impact sibling similarities in physical activity.
  • To investigate the influence of sibling type, body mass index, and geographical region on physical activity levels.

Main Methods:

  • 247 siblings (aged 6-17) from 110 Peruvian families participated.
  • Physical activity was measured using pedometers (steps/day, min/day).
  • Body mass index and geographical location (altitude, region) were recorded.

Main Results:

  • No significant changes in sibling resemblance after adjusting for individual and environmental factors.
  • Sister-sister pairs averaged fewer steps than brother-brother pairs.
  • Older siblings and those in high-altitude/Amazon regions exhibited higher daily step counts; BMI showed no association.
  • No significant influence of sibling type, BMI, or environment on physical activity phenotypes was observed.

Conclusions:

  • Sibling resemblance in physical activity is not significantly influenced by shared genetics, individual characteristics, or environment in this cohort.
  • Environmental factors like high altitude and region may play a role, but overall influence on sibling similarity was minimal.
  • Further research is needed to fully elucidate the complex determinants of physical activity behavior in siblings.