The difficulty of sit-ups tests: An empirical investigation

Margaret J. Safrit, Weimo Zhu, M. Glaucia Costa, Liru Zhang

Research output: Contribution to journalArticlepeer-review


This study estimated the difficulty of various sit-ups tests using an item response theory (IRT) model, the Rasch Poisson Counts model Sams were obtained on 18 sit-ups tests. All tests wen thought to vary in difficulty based on clinical observations. Item difficulty was defined by the Poisson model as the difficulty of Step 1, when the difficulty of a step represented the difficulty of completing a sit-up. The difficulty values of the tests ranged from -4.02 to -3.57. The easiest test was executed with hands on thighs and feet anchored. Most tests had good fit values. The results demonstrated that a variety of sit-ups tests can provide a range of difficulties and variety in forming a sit-ups test bank.

Original languageEnglish (US)
Pages (from-to)277-283
Number of pages7
JournalResearch Quarterly for Exercise and Sport
Issue number3
StatePublished - Sep 1992
Externally publishedYes


  • Fitness tests
  • IRT
  • Item response theory
  • Poisson model
  • Sit-ups

ASJC Scopus subject areas

  • Physical Therapy, Sports Therapy and Rehabilitation
  • Orthopedics and Sports Medicine
  • Nephrology


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