The story of sedentary behaviour and physical activity by accelerometry: a cohort study of adults from awakening to ICU discharge

Claire Baldwin, Kylie Johnston, Alex Rowlands, Francois Fraysse, Marie Williams

Research output: Contribution to conferencePoster


IIntroduction: Sedentary behavior (SB) and physical activity (PA) are modifiable independent risk factors for morbidity and mortality. Physical function in ICU survivors is often poor, yet objective descriptions of SB/PA patterns and in-hospital tracking over a hospitalisation are lacking. Objectives: To describe changes in SB/PA over 24-hour periods at awakening( T1), ICU discharge(T2) and hospital discharge(T3). Methods: A prospective observational study in a tertiary center of consecutive adults who required _5 days of mechanical ventilation. Data collected at T1/T2/T3 included: monitoring of body posture (SB) with the thigh-worn ActivPAL and PA (intensity) with the wrist-worn GENEActiv. SB/PA data were reported as time (percent-of-day) spent sitting/lying, upright, at intensity cut-points, and in PA bouts. Breaks from SB (sit-tostand transitions) were also reported. Statistical analysis from T1-T3 was by repeated measures analysis of variance. Results: 40 participants with mean(SD) age 62(15) years were recruited at T1. The mean(SD) time spent sitting/lying was 99.6%(0.9%) at T1(n ¼ 40), 99.0%(1.2%) at T2(n ¼ 38) and 96.7%(3.0%) at T3(n ¼ 23) (mean[95% confidence interval] decrease T1eT3 ¼ -3.0%[-4.6% to -1.4%], p_0.001). Time spent upright was 0.4%(0.9%) at T1(n ¼ 40), 1.0% (1.2%) at T2(n¼38) and 3.3%(3.0%) at T3(n ¼ 23) (mean[95% CI] increase T1eT3 ¼ 3.0%[1.4% to 4.6%], p_0.001). Time spent at ‘inactive’ intensities (<200g.min) decreased overall (p _ 0.018), but only over ICU admission (T1-T2) and not on the wards (T2eT3). Time spent upright in _2 and _5 minute bouts did not change in ICU (T1-T2), only increasing on theward (T2eT3, p_0.05). Sit-tostand transitions increased from T1eT3 (mean[95% CI] T1-T3 ¼17.7[10.8 to 27.7], p _ 0.001). Conclusion(s): ICU survivors’ decreased time spent lying/sitting and increased time spent upright over admission. PA bouts, SB breaks and PA intensity data showed how time was spent and when (ICU or ward) changes occurred that could be used to inform a SB intervention.
Original languageEnglish
Publication statusPublished - 2018
EventANZIC/ACCCN Intensive Care Annual Scientific Meeting - Adelaide Convention Centre, Adelaide, Australia
Duration: 11 Oct 201813 Oct 2018


ConferenceANZIC/ACCCN Intensive Care Annual Scientific Meeting
OtherThe ANZICS/ACCCN Intensive Care Annual Scientific Meeting is regarded as the flagship event for the Society. The ASM is one of the largest Intensive Care Conferences in the Southern Hemisphere, with over 1000 delegates attending each meeting. This year the event returns to Adelaide, South Australia from the 11th – 13th October 2018. The meeting is multidisciplinary and has a robust Scientific Program that is suited to all Critical Care Clinicians.
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