Measuring children's vertical ground reaction forces with accelerometry during walking, running, and jumping: The Iowa bone development study

Kathleen F. Janz, Smita Rao, Hope J. Baumann, Jaime L. Schultz

Research output: Contribution to journalArticle

Abstract

Ground reaction forces (GRF) are associated with bone hypertrophy; therefore, they are important to understanding physical activity's role in children's bone health. In this study, we examined the ability of accelerometry to predict vertical GRF in 40 children (mean age 8.6 yr) during slow walking, brisk walking, running, and jumping. Correlation coefficients between accelerometry-derived movement counts and GRF were moderate to high and significant during walking and running, but not during jumping. Given a large proportion of children's daily physical activity involves ambulation, accelerometry should be useful as a research method in bone-related research. However, this method underestimates GRF during jumping, an important physical activity for bone modeling and remodeling.

Original languageEnglish (US)
Pages (from-to)34-43
Number of pages10
JournalPediatric Exercise Science
Volume15
Issue number1
DOIs
StatePublished - Feb 2003

ASJC Scopus subject areas

  • Pediatrics, Perinatology, and Child Health
  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

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