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Cross-Validation of Predictive Equation for Cardiorespiratory Fitness by Modified Shuttle Walk Test in Adults with Schizophrenia: A Secondary Analysis of the CORTEX-SP Study

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  • Mikel Tous-Espelosin

    (GIzartea, Kirola eta Ariketa Fisikoa Ikerkuntza Taldea (GIKAFIT), Society, Sports and Physical Exercise Research Group, Department of Physical Education and Sport, Faculty of Education and Sport-Physical Activity and Sport Sciences Section, University of the Basque Country (UPV/EHU), 01007 Vitoria-Gasteiz, Spain
    Physical Activity, Exercise and Health Group, Bioaraba Health Research Institute, 01009 Vitoria-Gasteiz, Spain)

  • Sonia Ruiz de Azua

    (Cibersam, Department of Neuroscience, University of the Basque Country (UPV/EHU), 48940 Leioa, Spain)

  • Nagore Iriarte-Yoller

    (Refractory Psychosis Unit, Psychiatric Hospital of Alava, 01007 Vitoria-Gasteiz, Spain)

  • Pedro M. Sanchez

    (Refractory Psychosis Unit, Psychiatric Hospital of Alava, 01007 Vitoria-Gasteiz, Spain
    Faculty of Medicine, University of Deusto, 48007 Bilbao, Spain)

  • Edorta Elizagarate

    (Refractory Psychosis Unit, Psychiatric Hospital of Alava, 01007 Vitoria-Gasteiz, Spain)

  • Agurne Sampedro

    (Department of Psychology, Faculty of Health Sciences, University of Deusto, 48007 Bilbao, Spain)

  • Sara Maldonado-Martín

    (GIzartea, Kirola eta Ariketa Fisikoa Ikerkuntza Taldea (GIKAFIT), Society, Sports and Physical Exercise Research Group, Department of Physical Education and Sport, Faculty of Education and Sport-Physical Activity and Sport Sciences Section, University of the Basque Country (UPV/EHU), 01007 Vitoria-Gasteiz, Spain
    Physical Activity, Exercise and Health Group, Bioaraba Health Research Institute, 01009 Vitoria-Gasteiz, Spain)

Abstract

Cardiorespiratory fitness (CRF) can be direct or estimated from different field tests. The Modified Shuttle Walk Test (MSWT) is suitable for all levels of function, allowing a peak response to be elicited. Therefore, we aimed (1) to validate the equation presented in the original study by Singh et al. for evaluating the relationship between MSWT with peak oxygen uptake (VO 2peak ) in adults with schizophrenia (SZ), (2) to develop a new equation for the MSWT to predict VO 2peak , and (3) to validate the new equation. Participants (N = 144, 41.3 ± 10.2 years old) with SZ performed a direct measurement of VO 2peak through a cardiopulmonary exercise test and the MSWT. A new equation incorporating resting heart rate, body mass index, and distance from MSWT (R 2 = 0.617; adjusted R 2 = 0.60; p < 0.001) performs better than the Singh et al. equation (R 2 = 0.57; adjusted R 2 = 0.57; p < 0.001) to estimate VO 2peak for the studied population. The posteriori cross-validation method confirmed the model’s stability (R 2 = 0.617 vs. 0.626). The findings of the current study support the validity of the new regression equation incorporating resting heart rate, body mass index, and distance from MSWT to predict VO 2peak for assessment of CRF in people with SZ.

Suggested Citation

  • Mikel Tous-Espelosin & Sonia Ruiz de Azua & Nagore Iriarte-Yoller & Pedro M. Sanchez & Edorta Elizagarate & Agurne Sampedro & Sara Maldonado-Martín, 2021. "Cross-Validation of Predictive Equation for Cardiorespiratory Fitness by Modified Shuttle Walk Test in Adults with Schizophrenia: A Secondary Analysis of the CORTEX-SP Study," IJERPH, MDPI, vol. 18(21), pages 1-9, October.
    • Handle: RePEc:gam:jijerp:v:18:y:2021:i:21:p:11390-:d:667997
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    References listed on IDEAS

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    1. David Benkeser & Maya Petersen & Mark J. van der Laan, 2020. "Improved Small-Sample Estimation of Nonlinear Cross-Validated Prediction Metrics," Journal of the American Statistical Association, Taylor & Francis Journals, vol. 115(532), pages 1917-1932, December.
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