Reliability and validity of self-reported sitting and breaks from sitting in the workplace

Sudholz, Bronwyn and Ridgers, Nicola D. and Mussap, Alexander and Bennie, Jason ORCID: https://orcid.org/0000-0002-8668-8998 and Timperio, Anna and Salmon, Jo (2018) Reliability and validity of self-reported sitting and breaks from sitting in the workplace. Journal of Science and Medicine in Sport, 21 (7). pp. 697-701. ISSN 1440-2440


Abstract

Objectives
Prolonged sitting is a health risk factor which is ubiquitous to the workplace, and breaking up prolonged sitting is widely recommended. This study evaluated the test–retest reliability and concurrent validity of a self-report measure of duration of sitting and breaks from sitting in the workplace.

Design
Cross-sectional study.

Methods
Fifty-nine workers who reported spending most of their work time sitting wore an activPAL inclinometer and the ActiGraph accelerometer for eight consecutive days, and completed single-item measures of duration of sitting (min/work hour) and breaks from sitting (frequency/per work hour), twice, seven days apart.

Results
Participants reported sitting at work for a median of 420 min/day (Interquartile Range = 360–450 min/day) and taking one break (Interquartile Range = 1.0–2.0) from sitting per work hour. For reported duration of workplace sitting, test–retest reliability was adequate (Intra-Class Correlations = 0.78, 95% Confidence Intervals [CI] = 0.65, 0.86), and concurrent validity fair against the activPAL (Spearman’s Rho = 0.24, CI-1.0,0.47) and the ActiGraph (Rho = 0.39, CI = 0.15, 0.68). For reported breaks from sitting (frequency/per work hour), test–retest reliability was adequate (Intra-Class Correlations = 0.65, CI = 0.48, 0.78) and concurrent validity fair against the activPAL (Spearman’s Rho = 0.39, CI = 0.25, 0.74) and the ActiGraph (Spearman’s Rho = 0.30, CI = 0.15, 0.69). Self-reported duration of sitting was biased toward over-reporting compared to the activPAL (median = 45.4 min) and under-reporting compared to the ActiGraph (median = 21.7 min).

Conclusions
This study found adequate reliability and fair validity for self-reported duration of sitting (min/work day) and breaks from sitting (frequency/per work hour). Further validity research is needed using the inclinometer.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Research and Innovation Division (12 Jul 2012 -)
Faculty/School / Institute/Centre: Current - Research and Innovation Division (12 Jul 2012 -)
Date Deposited: 17 Feb 2021 05:28
Last Modified: 26 Feb 2021 03:45
Uncontrolled Keywords: activPAL; ActiGraph; Sedentary-behaviour; Sedentary-occupation; Psychometrics
Fields of Research (2008): 11 Medical and Health Sciences > 1117 Public Health and Health Services > 111716 Preventive Medicine
11 Medical and Health Sciences > 1106 Human Movement and Sports Science > 110699 Human Movement and Sports Science not elsewhere classified
Fields of Research (2020): 42 HEALTH SCIENCES > 4207 Sports science and exercise > 420799 Sports science and exercise not elsewhere classified
42 HEALTH SCIENCES > 4202 Epidemiology > 420201 Behavioural epidemiology
Identification Number or DOI: https://doi.org/10.1016/j.jsams.2017.10.030
URI: http://eprints.usq.edu.au/id/eprint/41272

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