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Purpose <p>To validate the Turkish International Fitness Scale (IFIS) for young adults and test its gender invariance. To evaluate young adults’ fitness using both the IFIS and field-based tests and examine relationships among perceived fitness, objective fitness, physical activity, and self-rated health.</p> Methods <p>Eighty university students (mean age: 20.7&#xa0;years; 45 females) completed the IFIS, objective tests (20&#xa0;m shuttle-run, T-test, grip strength, flexibility evaluations), self-rated health, international physical activity questionnaire, and short form-36 (SF 36) questionnaires. Following a three-day test–retest interval, IFIS was completed by the participants again.</p> Results <p>The Turkish IFIS demonstrated acceptable internal consistency (Cronbach’s α = 0.77) and test–retest reliability (κ = 0.50–0.70) in young adults; preliminary support for gender invariance was observed. Total IFIS scores showed a positive correlation with self-rated health (<i>r</i> = 0.63, <i>p</i> &lt; 0.01) and were significantly associated with physical activity levels (<i>r</i> = 0.24, <i>p</i> = 0.03). Significant correlations of IFIS were also found with SF-36 subscales, including physical functioning (<i>r</i> = 0.25, <i>p</i> = 0.03), general health (<i>r</i> = 0.42, <i>p</i> &lt; 0.001), energy (<i>r</i> = 0.26, <i>p</i> = 0.02), and bodily pain (<i>r</i> = 0.23, <i>p</i> = 0.04). Objective fitness measures further validated these findings, as self-rated health correlated significantly with predicted VO2max (<i>r</i> = 0.41, <i>p</i> &lt; 0.001) and T-test agility performance (<i>r</i> = − 0.25, <i>p</i> = 0.02). Additionally, physical activity levels were significantly associated with VO2max (<i>r</i> = 0.30, <i>p</i> = 0.009), agility (<i>r</i> = 0.27, <i>p</i> = 0.01), and both dominant and non-dominant grip strength (<i>r</i> = 0.26, <i>p</i> = 0.02; <i>r</i> = 0.25, <i>p</i> = 0.03, respectively).</p> Conclusions <p>Both objective and perceived fitness levels associated with self-rated health. The Turkish IFIS is a valid, reliable, and gender-invariant low-cost screening instrument for assessing perceived fitness in university students. Low to moderate correlations of perceived physical fitness with objective field-based physical fitness tests represents that perceived and field-based physical fitness evaluations should not be used interchangeably.</p>

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Evaluation of young adults’ fitness level by international fitness scale: associations with field-based fitness tests, self-rated health and health-related quality of life

  • 期刊论文

  • 发表日期：

    2026年7月22日

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  • Özge Çinar-Medeni,
  • Seyma Mutlu-Kayaarslan,
  • Ilknur E. Dogan,
  • Neslihan Durutürk,
  • Mustafa A. Tekindal,
  • Hilal Yazici-Ilhan,
  • Saadet Ö. Uzun,
  • Samiye Alkoy-Bay,
  • Halime C. Tezeren,
  • Zeynep Özel

摘要

Purpose

To validate the Turkish International Fitness Scale (IFIS) for young adults and test its gender invariance. To evaluate young adults’ fitness using both the IFIS and field-based tests and examine relationships among perceived fitness, objective fitness, physical activity, and self-rated health.

Methods

Eighty university students (mean age: 20.7 years; 45 females) completed the IFIS, objective tests (20 m shuttle-run, T-test, grip strength, flexibility evaluations), self-rated health, international physical activity questionnaire, and short form-36 (SF 36) questionnaires. Following a three-day test–retest interval, IFIS was completed by the participants again.

Results

The Turkish IFIS demonstrated acceptable internal consistency (Cronbach’s α = 0.77) and test–retest reliability (κ = 0.50–0.70) in young adults; preliminary support for gender invariance was observed. Total IFIS scores showed a positive correlation with self-rated health (r = 0.63, p < 0.01) and were significantly associated with physical activity levels (r = 0.24, p = 0.03). Significant correlations of IFIS were also found with SF-36 subscales, including physical functioning (r = 0.25, p = 0.03), general health (r = 0.42, p < 0.001), energy (r = 0.26, p = 0.02), and bodily pain (r = 0.23, p = 0.04). Objective fitness measures further validated these findings, as self-rated health correlated significantly with predicted VO2max (r = 0.41, p < 0.001) and T-test agility performance (r = − 0.25, p = 0.02). Additionally, physical activity levels were significantly associated with VO2max (r = 0.30, p = 0.009), agility (r = 0.27, p = 0.01), and both dominant and non-dominant grip strength (r = 0.26, p = 0.02; r = 0.25, p = 0.03, respectively).

Conclusions

Both objective and perceived fitness levels associated with self-rated health. The Turkish IFIS is a valid, reliable, and gender-invariant low-cost screening instrument for assessing perceived fitness in university students. Low to moderate correlations of perceived physical fitness with objective field-based physical fitness tests represents that perceived and field-based physical fitness evaluations should not be used interchangeably.