Aerobic fitness and body mass index in individuals with schizophrenia: Implications for neurocognition and daily functioning

David Kimhy, Julia Vakhrusheva, Matthew N. Bartels, Hilary F. Armstrong, Jacob S. Ballon, Samira Khan, Rachel W. Chang, Marie C. Hansen, Lindsey Ayanruoh, Edward E. Smith, Richard P. Sloan

Research output: Contribution to journalArticle

36 Scopus citations

Abstract

Previous reports indicate that among healthy individuals low aerobic fitness (AF) and high body-mass index (BMI) predict poor neurocognition and daily-functioning. It is unknown whether these associations extend to disorders characterized by poor neurocognition, such as schizophrenia. Therefore, we compared AF and BMI in individuals with schizophrenia and non-clinical controls, and then within the schizophrenia group we examined the links between AF, BMI, neurocognition and daily-functioning. Thirty-two individuals with schizophrenia and 64 gender- and age-matched controls completed assessments of AF (indexed by VO2max) and BMI. The former also completed measures of neurocognition, daily-functioning and physical activity. The schizophrenia group displayed significantly lower AF and higher BMI. In the schizophrenia group, AF was significantly correlated with overall neurocognition (r=0.57), along with executive functioning, working memory, social cognition, and processing speed. A hierarchical regression analysis indicated that AF accounted for 22% of the neurocognition variance. Furthermore, AF was significantly correlated with overall daily-functioning (r=0.46). In contrast, BMI displayed significant inverse correlations with neurocognition, but no associations to daily-functioning. AF was significantly correlated physical activity. The authors discuss the potential use of AF-enhancing interventions to improve neurocognitive and daily-functioning in schizophrenia, along with putative neurobiological mechanisms underlying these links, including Brain-Derived Neurotrophic Factor.

Original languageEnglish (US)
Pages (from-to)784-791
Number of pages8
JournalPsychiatry Research
Volume220
Issue number3
DOIs
StatePublished - Dec 30 2014

Keywords

  • Aerobic fitness
  • Body mass index
  • Daily functioning
  • Neurocognition
  • Schizophrenia

ASJC Scopus subject areas

  • Psychiatry and Mental health
  • Biological Psychiatry

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    Kimhy, D., Vakhrusheva, J., Bartels, M. N., Armstrong, H. F., Ballon, J. S., Khan, S., Chang, R. W., Hansen, M. C., Ayanruoh, L., Smith, E. E., & Sloan, R. P. (2014). Aerobic fitness and body mass index in individuals with schizophrenia: Implications for neurocognition and daily functioning. Psychiatry Research, 220(3), 784-791. https://doi.org/10.1016/j.psychres.2014.08.052