Gymnastik- och idrottshögskolan, GIH

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Reliability of the accelerometer to control the effects of physical activity in older adults.
Swedish School of Sport and Health Sciences, GIH, Department of Physical Activity and Health. Department of Molecular Medicine and Surgery, Karolinska Institutet, Stockholm, Sweden.ORCID iD: 0000-0002-5574-4408
Swedish School of Sport and Health Sciences, GIH, Department of Physiology, Nutrition and Biomechanics.ORCID iD: 0000-0002-0081-4691
Swedish School of Sport and Health Sciences, GIH, Department of Physiology, Nutrition and Biomechanics. Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden..ORCID iD: 0000-0002-3612-449X
Swedish School of Sport and Health Sciences, GIH, Department of Physical Activity and Health.ORCID iD: 0000-0002-3185-9702
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2022 (English)In: PLOS ONE, E-ISSN 1932-6203, Vol. 17, no 9, article id e0274442Article in journal (Refereed) Published
Abstract [en]

BACKGROUND: Reliable physical activity measurements in community-dwelling older adults are important to determine effects of targeted health promotion interventions. Many exercise interventions aim to improve time spent sedentary (SED), in light-intensity-physical-activity (LPA) and moderate-to-vigorous-intensity-physical-activity (MVPA), since these parameters have independently proposed associations with health and longevity. However, many previous studies rely on self-reports which have lower validity compared to accelerometer measured physical activity patterns. In addition, separating intervention-effects from reactivity measurements requires sufficient test-retest reliability for accelerometer assessments, which is lacking in older adults.

OBJECTIVES: The study objective was to investigate the reliability of sensor-based PA-patterns in community-dwelling older adults. Furthermore, to investigate change over time of physical activity patterns and examine any compensatory-effect from the eight-week supervised exercise-intervention.

METHODS: An exercise-group (n = 78, age-range:65-91yrs) performed two 1h-exercise sessions/week during eight-weeks. PA-pattern was assessed (using hip-worn accelerometers), twice before and once during the last-week of the intervention. A control-group (n = 43, age-range:65-88yrs) performed one pre-test and the end-test with no exercise-intervention. A dependent-t-test, mean-difference (95%-CI), limits-of-agreement and intraclass-correlation-coefficient-ICC were used between the two pre-tests. Repeated-measures-ANOVA were used to analyze any intervention-effects.

RESULTS: The exercise-groups´ two pre-tests showed generally no systematic change in any PA- or SED-parameter (ICC ranged 0.75-0.90). Compared to the control group, the exercise intervention significantly (time x group-interaction, p<0.05) increased total-PA-cpm (exercise-group/control-group +17%/+7%) and MVPA-min/week (+41/-2min) and decreased %-of-wear-time for SED-total (-4.7%/-2.7%) and SED-bouts (-5.7%/-1.8%), and SED-bouts min/d (-46/-16min). At baseline level, no significant differences were found between the two groups for any parameter.

CONCLUSIONS: The current study presents a good test-retest-reliability of sensor-based-one-week-assessed-PA-pattern in older-adults. Participating in an 8-week supervised exercise intervention improved some physical activity and sedentary parameters compared to the control group. No compensatory-effect was noted in the intervention-group i.e., no decrease in any PA-parameter or increase in SED at End-test (in %-of-wear-time, min/day or total-PA).

Place, publisher, year, edition, pages
Public Library of Science (PLoS) , 2022. Vol. 17, no 9, article id e0274442
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Sport and Fitness Sciences
Research subject
Medicine/Technology
Identifiers
URN: urn:nbn:se:gih:diva-7369DOI: 10.1371/journal.pone.0274442ISI: 000892376500041PubMedID: 36095032OAI: oai:DiVA.org:gih-7369DiVA, id: diva2:1707698
Available from: 2022-11-01 Created: 2022-11-01 Last updated: 2023-01-11

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Godhe, MannePontén, MarjanNilsson, JohnnyKallings, LenaAndersson, Eva

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