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Reaction time, cardiorespiratory fitness and mortality in UK Biobank: An observational study

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  • Yates, Thomas
  • Bakrania, Kishan
  • Zaccardi, Francesco
  • Dhalwani, Nafeesa N.
  • Hamer, Mark
  • Davies, Melanie J.
  • Khunti, Kamlesh

Abstract

Intelligence has previously been associated with mortality, although it is unclear whether the inverse association is independent of other related cognitive factors, such as information processing, or of measures related to physical health, such as cardiorespiratory fitness. We investigate whether fluid intelligence, reaction time and cardiorespiratory fitness are independently associated with mortality within the general population. UK Biobank recruited adults across England, Scotland and Wales, between March 2006 and July 2010: 54,019 participants (women 52%) with complete data were included in the analysis. Those who died in the first year of follow-up (n=58) were excluded. Fluid intelligence was measured as the number of correct answers during a two minute logic/reasoning-test, reaction time was measured as average time taken to respond to matching symbols on a computer screen and cardiorespiratory fitness was measured through a sub-maximal exercise test. Associations with mortality were assessed by Cox-proportional hazard models adjusted for age, sex, ethnicity, social deprivation, cancer and non-cancer illnesses, medications, employment, education, smoking, BMI, diet, sleep, and physical activity. Over 5.8years of follow-up, there were 779 deaths. Higher intelligence (hazard ratio [HR] per SD=0.91; 95% CI 0.84, 0.99), faster reaction time (HR per SD=0.92; 0.85, 0.98) and higher fitness (HR per SD=0.85; 0.78, 0.93) were associated with a lower risk of mortality after adjustment for each other and other covariates. No interaction was observed between fluid intelligence and reaction time (p=0.147) or between fluid intelligence and cardiorespiratory fitness (p=0.238). In conclusion, fluid intelligence, reaction time and cardiorespiratory fitness were independently associated with mortality.

Suggested Citation

  • Yates, Thomas & Bakrania, Kishan & Zaccardi, Francesco & Dhalwani, Nafeesa N. & Hamer, Mark & Davies, Melanie J. & Khunti, Kamlesh, 2018. "Reaction time, cardiorespiratory fitness and mortality in UK Biobank: An observational study," Intelligence, Elsevier, vol. 66(C), pages 79-83.
    • Handle: RePEc:eee:intell:v:66:y:2018:i:c:p:79-83
    DOI: 10.1016/j.intell.2017.11.006
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    2. Ian Deary, 2008. "Why do intelligent people live longer?," Nature, Nature, vol. 456(7219), pages 175-176, November.
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