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J Sport Health Sci. 2018 Jan;7(1):95-101. doi: 10.1016/j.jshs.2017.01.007. Epub 2017 Jan 18.

Associations between walking parameters and subsequent sleep difficulty in older adults: A 2-year follow-up study.

Author information

1
Department of Exercise Health Science, National Taiwan University of Sport, Taichung, Taiwan 40404, China.
2
Department of Epidemiology and Public Health, University College London, London WC1E 7HB, UK.
3
Centre for Exercise, Nutrition and Health Sciences, University of Bristol, Bristol BS8 1TH, UK.
4
Family Medicine Department, Taipei City Hospital Zhongxing Branch, Taipei, Taiwan 10341, China.
5
Graduate Institute of Translation and Interpretation, National Changhua University of Education, Changhua, Taiwan 50007, China.
6
Graduate Institute of Sports and Health, National Changhua University of Education, Changhua, Taiwan 50007, China.
7
Department of Neurosurgery, Taipei City Hospital and Institute of Public Health and Community Medicine Research Center, National Yang-Ming University, Taipei, Taiwan 11221, China.

Abstract

Purpose:

This 2-year follow-up study aimed to examine the associations between total volume, frequency, duration, and speed of walking with subsequent sleep difficulty in older adults.

Methods:

A total of 800 older adults aged 65 years and over participated in the first survey in 2012 and 511 of them were followed 2 years later. The 5-item Athens Insomnia Scale (AIS-5) was used to measure sleep difficulty. Frequency, duration, and speed of outdoor walking were self-reported. Walking speed was assigned a metabolic equivalent value (MET) from 2.5 to 4.5. Total walking volume in MET-h/week was calculated as frequency × duration × speed. Negative binomial regressions were performed to examine the associations between volume and components of walking with subsequent sleep difficulty with covariates of age, sex, education, marital status, living arrangement, smoking, alcohol consumption, mental health, Charlson Index, exercise (excluding walking), and sleep difficulty at baseline.

Results:

Participants with low walking volume had a higher level of sleep difficulty 2 years later compared with those with high walking volume (incident rate ratios = 1.61, p = 0.004). When speed, frequency, and duration of walking were simultaneously entered into 1 model, only walking speed was significantly associated with subsequent sleep difficulty (after the model was adjusted for covariates and baseline sleep difficulty). Sensitivity analyses showed that walking duration emerged as a significant predictor among 3 walking parameters, with 2-year changes of sleep scores as dependent variable.

Conclusion:

Total amount of walking (especially faster walking and lasting for more than 20 min) is associated with less subsequent sleep difficulty after 2 years among older adults.

KEYWORDS:

Disturbed sleep; Exercise; Insomnia; Physical activity; Prospective study; Sleep disorder

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