Sekikawa K1, Kawae T2, Umayahara Y3, Namba H1, Sato Y1, Aizawa F1, Otoyama I1, Kajiwara T1, Kamikawa M1, Hamada H1
1Graduate School of Biomedical and Health Sciences, Hiroshima University, Department of Physical Analysis and Therapeutic Sciences, Hiroshima, Japan, 2Hiroshima University Hospital, Division of Rehabilitation, Hiroshima, Japan, 3Hiroshima Cosmopolitan University, Department of Rehabilitation, Faculty of Health Sciences, Hiroshima, Japan
Background: The triaxial accelerometer is a widely used method of objective evaluation of physical activity. However, the reliability and validity of the triaxial accelerometer during low-intensity non-locomotive activities in the elderly are not verified.
Purpose: The purpose of this study was to examine the reliability and validity of the triaxial accelerometer during low-intensity non-locomotive activities in the elderly.
Methods: Eleven elderly persons (mean [SD] age=87[7] years) were recruited from a daycare center and performed 4 non-locomotive activities (folding towels, table wiping, hanging clothes, mopping). Metabolic equivalents (METS) were measured using a portable metabolic cart (AE-100i, Minato) during non-locomotive activities and then estimated using a triaxial accelerometer (HJA-350IT, Omron) that was worn at the waist. Two repeated measurements taken by the same rater on separate days were used to calculate the test-retest reliability. Linear regression analyses were used to test the differences between measured and estimated METS. The Bland and Altman plot analysis was used to compare estimated METS and measured METS of the same values.
Results: The intraclass correlation coefficient (ICC) based on the estimated METS were between 0.49 and 0.59. Significant associations between the estimated and measured METS were found (r = 0.74, P 0.001). The mean values were 1.9 METS in the estimated and 1.6 METS in the measured. The mean difference between the two measurement techniques was 0.21 and the 95% limits of agreement were between -0.33 and 0.75. There was no significant correlation difference between the two values with the mean of the two measurements (r=0.04, P=0.6). In the Bland and Altman plot, there was no constant and proportional bias in the level measured using the two methods.
Conclusion(s): The results show that estimating the low intensity of non-locomotive activities in elderly has reliability and validity.
Implications: The triaxial accelerometer is a useful instrument to measure low-intensity ADL in elderly persons.
Keywords: non-locomotive activities, elderly, validity
Funding acknowledgements: The work was unfunded.
Purpose: The purpose of this study was to examine the reliability and validity of the triaxial accelerometer during low-intensity non-locomotive activities in the elderly.
Methods: Eleven elderly persons (mean [SD] age=87[7] years) were recruited from a daycare center and performed 4 non-locomotive activities (folding towels, table wiping, hanging clothes, mopping). Metabolic equivalents (METS) were measured using a portable metabolic cart (AE-100i, Minato) during non-locomotive activities and then estimated using a triaxial accelerometer (HJA-350IT, Omron) that was worn at the waist. Two repeated measurements taken by the same rater on separate days were used to calculate the test-retest reliability. Linear regression analyses were used to test the differences between measured and estimated METS. The Bland and Altman plot analysis was used to compare estimated METS and measured METS of the same values.
Results: The intraclass correlation coefficient (ICC) based on the estimated METS were between 0.49 and 0.59. Significant associations between the estimated and measured METS were found (r = 0.74, P 0.001). The mean values were 1.9 METS in the estimated and 1.6 METS in the measured. The mean difference between the two measurement techniques was 0.21 and the 95% limits of agreement were between -0.33 and 0.75. There was no significant correlation difference between the two values with the mean of the two measurements (r=0.04, P=0.6). In the Bland and Altman plot, there was no constant and proportional bias in the level measured using the two methods.
Conclusion(s): The results show that estimating the low intensity of non-locomotive activities in elderly has reliability and validity.
Implications: The triaxial accelerometer is a useful instrument to measure low-intensity ADL in elderly persons.
Keywords: non-locomotive activities, elderly, validity
Funding acknowledgements: The work was unfunded.
Topic: Human movement analysis
Ethics approval required: Yes
Institution: Hiroshima university
Ethics committee: The Ethics Committee of Graduate School of Health Sciences
Ethics number: 1329
All authors, affiliations and abstracts have been published as submitted.
