Validation of SOFIT for measuring physical activity of first- to eighth-grade students

Paul J. Rowe, Joel M. Schuldheisz, Hans Van Der Mars

Research output: Contribution to journalArticle

90 Scopus citations

Abstract

The purpose of this study was to assess the validity of the System for Observing Fitness Instruction Time (SOFIT) for measuring physical activity of elementary and middle school children. Students (N= 173, 92 boys and 81 girls) from Grades 1-8 completed a standardized protocol that included lying, sitting, standing, walking, running, curl-ups, and push-ups. Heart rates were used as a criterion for concurrent validity. The results confirm the validity of the physical activity codes of SOFIT for elementary and middle school children. Activity Categories 2-5 indicate different levels of energy expenditure, whereas Categories 1 (lying) and 2 (sitting) refer to the same energy expenditure level. The common distinction between SOFIT Levels 4 and 5 as MVPA (moderate to vigorous physical activity) and SOFIT Levels 1 to 3 as non-MVPA is valid. Curl-ups and push-ups should be coded as MVPA.

Original languageEnglish (US)
Pages (from-to)136-149
Number of pages14
JournalPediatric Exercise Science
Volume9
Issue number2
DOIs
StatePublished - May 1997
Externally publishedYes

ASJC Scopus subject areas

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

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