Validation of the AX3 triaxial accelerometer in older functionally impaired people

Clare C. Clarke (Lead / Corresponding author), Judith Taylor, Linda J. Crighton, James A. Goodbrand, Marion E. T. McMurdo, Miles D. Witham

Research output: Contribution to journalArticle

7 Citations (Scopus)
283 Downloads (Pure)

Abstract

Background: Studying physical activity (PA) trends in older populations and potential interventions for increasing PA is important, as PA is a factor in many age-related health outcomes such as chronic disease, premature mortality, physical function, and injuries from falls[1]. Objective measures of PA provide valuable information regarding the functional impact that ageing and chronic disease states may have on a patient’s life. Aims: The purpose of this study was to test the validity of the AX3 PA monitor in an older population, to investigate if the AX3 is a valid measure of distinct types or levels of activity in older people with a spectrum of mobility. Methods: Validity of the AX3 PA monitor was tested using the RT3 as a means of cross validating the AX3. Study participants wore both the AX3 and the RT3 accelerometers, positioned on their non-dominant side, while completing a series of standardised everyday activities. Results: Although overall correlation was high (r>0.8) between the RT3 and lower-limb mounted AX3 counts, the correlation between the two devices was much stronger for walking activity than for any of the non-walking activities. Discussion: Activity counts at all lower limb positions for the AX3 and RT3 were highly correlated. Correlation between wrist-mounted AX3 counts and lower limb AX3 counts was only moderate, and worsened when walking aids were in use. Conclusions: The results of this study indicate that the AX3 monitor is a valid tool, which might be used to objectively measure walking activity in older, functionally impaired adults; a welcome finding for this under-researched area.
Original languageEnglish
Pages (from-to)451-457
Number of pages7
JournalAging Clinical and Experimental Research
Volume29
Issue number3
Early online date19 Jul 2016
DOIs
Publication statusPublished - Jun 2017

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Exercise
Walking
Lower Extremity
Chronic Disease
Premature Mortality
Wrist
Population
Equipment and Supplies
Health
Wounds and Injuries

Keywords

  • Physical activity
  • Older adults
  • Ageing
  • Accelerometry
  • Public health

Cite this

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title = "Validation of the AX3 triaxial accelerometer in older functionally impaired people",
abstract = "Background: Studying physical activity (PA) trends in older populations and potential interventions for increasing PA is important, as PA is a factor in many age-related health outcomes such as chronic disease, premature mortality, physical function, and injuries from falls[1]. Objective measures of PA provide valuable information regarding the functional impact that ageing and chronic disease states may have on a patient’s life. Aims: The purpose of this study was to test the validity of the AX3 PA monitor in an older population, to investigate if the AX3 is a valid measure of distinct types or levels of activity in older people with a spectrum of mobility. Methods: Validity of the AX3 PA monitor was tested using the RT3 as a means of cross validating the AX3. Study participants wore both the AX3 and the RT3 accelerometers, positioned on their non-dominant side, while completing a series of standardised everyday activities. Results: Although overall correlation was high (r>0.8) between the RT3 and lower-limb mounted AX3 counts, the correlation between the two devices was much stronger for walking activity than for any of the non-walking activities. Discussion: Activity counts at all lower limb positions for the AX3 and RT3 were highly correlated. Correlation between wrist-mounted AX3 counts and lower limb AX3 counts was only moderate, and worsened when walking aids were in use. Conclusions: The results of this study indicate that the AX3 monitor is a valid tool, which might be used to objectively measure walking activity in older, functionally impaired adults; a welcome finding for this under-researched area.",
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Validation of the AX3 triaxial accelerometer in older functionally impaired people. / Clarke, Clare C. (Lead / Corresponding author); Taylor, Judith; Crighton, Linda J.; Goodbrand, James A.; McMurdo, Marion E. T.; Witham, Miles D.

In: Aging Clinical and Experimental Research, Vol. 29, No. 3, 06.2017, p. 451-457.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Validation of the AX3 triaxial accelerometer in older functionally impaired people

AU - Clarke, Clare C.

AU - Taylor, Judith

AU - Crighton, Linda J.

AU - Goodbrand, James A.

AU - McMurdo, Marion E. T.

AU - Witham, Miles D.

PY - 2017/6

Y1 - 2017/6

N2 - Background: Studying physical activity (PA) trends in older populations and potential interventions for increasing PA is important, as PA is a factor in many age-related health outcomes such as chronic disease, premature mortality, physical function, and injuries from falls[1]. Objective measures of PA provide valuable information regarding the functional impact that ageing and chronic disease states may have on a patient’s life. Aims: The purpose of this study was to test the validity of the AX3 PA monitor in an older population, to investigate if the AX3 is a valid measure of distinct types or levels of activity in older people with a spectrum of mobility. Methods: Validity of the AX3 PA monitor was tested using the RT3 as a means of cross validating the AX3. Study participants wore both the AX3 and the RT3 accelerometers, positioned on their non-dominant side, while completing a series of standardised everyday activities. Results: Although overall correlation was high (r>0.8) between the RT3 and lower-limb mounted AX3 counts, the correlation between the two devices was much stronger for walking activity than for any of the non-walking activities. Discussion: Activity counts at all lower limb positions for the AX3 and RT3 were highly correlated. Correlation between wrist-mounted AX3 counts and lower limb AX3 counts was only moderate, and worsened when walking aids were in use. Conclusions: The results of this study indicate that the AX3 monitor is a valid tool, which might be used to objectively measure walking activity in older, functionally impaired adults; a welcome finding for this under-researched area.

AB - Background: Studying physical activity (PA) trends in older populations and potential interventions for increasing PA is important, as PA is a factor in many age-related health outcomes such as chronic disease, premature mortality, physical function, and injuries from falls[1]. Objective measures of PA provide valuable information regarding the functional impact that ageing and chronic disease states may have on a patient’s life. Aims: The purpose of this study was to test the validity of the AX3 PA monitor in an older population, to investigate if the AX3 is a valid measure of distinct types or levels of activity in older people with a spectrum of mobility. Methods: Validity of the AX3 PA monitor was tested using the RT3 as a means of cross validating the AX3. Study participants wore both the AX3 and the RT3 accelerometers, positioned on their non-dominant side, while completing a series of standardised everyday activities. Results: Although overall correlation was high (r>0.8) between the RT3 and lower-limb mounted AX3 counts, the correlation between the two devices was much stronger for walking activity than for any of the non-walking activities. Discussion: Activity counts at all lower limb positions for the AX3 and RT3 were highly correlated. Correlation between wrist-mounted AX3 counts and lower limb AX3 counts was only moderate, and worsened when walking aids were in use. Conclusions: The results of this study indicate that the AX3 monitor is a valid tool, which might be used to objectively measure walking activity in older, functionally impaired adults; a welcome finding for this under-researched area.

KW - Physical activity

KW - Older adults

KW - Ageing

KW - Accelerometry

KW - Public health

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DO - 10.1007/s40520-016-0604-8

M3 - Article

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EP - 457

JO - Aging Clinical and Experimental Research

JF - Aging Clinical and Experimental Research

SN - 1594-0667

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ER -