Validation of a novel device to measure and provide feedback on sedentary behavior

Jason M.R. Gill, Nabeha S.A. Hawati, Douglas J. Maxwell, David Louden, Nikos Mourselas, Christopher Bunn, Cindy M. Gray, Hidde P. van der Ploeg, Kate Hunt, Anne Martin, Sally Wyke, Nanette Mutrie

Research output: Contribution to journalArticle

Abstract

Purpose: Pedometers, which enable self-monitoring of step counts, are effective in facilitating increases in physical activity. Similar devices which provide real-time feedback on sedentary (sitting) behavior are limited. This study aimed to develop and validate a novel device – the SitFIT – which could accurately measure and provide feedback on sedentary behavior and physical activity. Methods: The SitFIT is a tri-axial accelerometer, developed by PAL Technologies, which is worn in the front trouser pocket. This enables tracking of thigh inclination and therefore differentiation between sitting and upright postures, as well as tracking of step count. It has a display to provide user feedback. To determine the validity of the SitFIT for measuring sedentary behavior and step counts, 21 men, aged 30-65 years, with body mass index 26.6±3.9 kg.m-2 wore a SitFIT in a front trouser pocket and an activPAL accelerometer attached to their thigh for up to seven days. Outputs from the SitFIT were compared with the activPAL, which was assumed to provide gold-standard measurements of sitting and step counts. Results: Mean step counts were ~4% lower with the SitFIT than activPAL, with correlation between the two methods being very high (r=0.98) and no obvious bias from the line of equality (regression line: y=1.0035x+418.35). Mean sedentary time was ~5% higher with the SitFIT than activPAL, correlation between methods was high (r=0.84) and the equation of the regression line was close to the line of equality (y=0.8728x+38.445). Conclusions: The SitFIT has excellent validity for measurement of free-living step counts and sedentary time and therefore addresses a clear need for a device that can be used as a tool to provide feedback on sedentary behavior to facilitate behavior change.
LanguageEnglish
Number of pages27
JournalMedicine and Science in Sports and Exercise
Publication statusAccepted/In press - 7 Oct 2017

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Equipment and Supplies
Thigh
Exercise
Posture
Gold
Body Mass Index
Technology

Keywords

  • sedentary
  • sitting
  • objective measurements
  • validation
  • behavior change

Cite this

Gill, J. M. R., Hawati, N. S. A., Maxwell, D. J., Louden, D., Mourselas, N., Bunn, C., ... Mutrie, N. (Accepted/In press). Validation of a novel device to measure and provide feedback on sedentary behavior. Medicine and Science in Sports and Exercise.
Gill, Jason M.R. ; Hawati, Nabeha S.A. ; Maxwell, Douglas J. ; Louden, David ; Mourselas, Nikos ; Bunn, Christopher ; Gray, Cindy M. ; van der Ploeg, Hidde P. ; Hunt, Kate ; Martin, Anne ; Wyke, Sally ; Mutrie, Nanette. / Validation of a novel device to measure and provide feedback on sedentary behavior. In: Medicine and Science in Sports and Exercise. 2017.
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abstract = "Purpose: Pedometers, which enable self-monitoring of step counts, are effective in facilitating increases in physical activity. Similar devices which provide real-time feedback on sedentary (sitting) behavior are limited. This study aimed to develop and validate a novel device – the SitFIT – which could accurately measure and provide feedback on sedentary behavior and physical activity. Methods: The SitFIT is a tri-axial accelerometer, developed by PAL Technologies, which is worn in the front trouser pocket. This enables tracking of thigh inclination and therefore differentiation between sitting and upright postures, as well as tracking of step count. It has a display to provide user feedback. To determine the validity of the SitFIT for measuring sedentary behavior and step counts, 21 men, aged 30-65 years, with body mass index 26.6±3.9 kg.m-2 wore a SitFIT in a front trouser pocket and an activPAL accelerometer attached to their thigh for up to seven days. Outputs from the SitFIT were compared with the activPAL, which was assumed to provide gold-standard measurements of sitting and step counts. Results: Mean step counts were ~4{\%} lower with the SitFIT than activPAL, with correlation between the two methods being very high (r=0.98) and no obvious bias from the line of equality (regression line: y=1.0035x+418.35). Mean sedentary time was ~5{\%} higher with the SitFIT than activPAL, correlation between methods was high (r=0.84) and the equation of the regression line was close to the line of equality (y=0.8728x+38.445). Conclusions: The SitFIT has excellent validity for measurement of free-living step counts and sedentary time and therefore addresses a clear need for a device that can be used as a tool to provide feedback on sedentary behavior to facilitate behavior change.",
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Gill, JMR, Hawati, NSA, Maxwell, DJ, Louden, D, Mourselas, N, Bunn, C, Gray, CM, van der Ploeg, HP, Hunt, K, Martin, A, Wyke, S & Mutrie, N 2017, 'Validation of a novel device to measure and provide feedback on sedentary behavior' Medicine and Science in Sports and Exercise.

Validation of a novel device to measure and provide feedback on sedentary behavior. / Gill, Jason M.R.; Hawati, Nabeha S.A.; Maxwell, Douglas J.; Louden, David; Mourselas, Nikos; Bunn, Christopher; Gray, Cindy M.; van der Ploeg, Hidde P.; Hunt, Kate; Martin, Anne; Wyke, Sally; Mutrie, Nanette.

In: Medicine and Science in Sports and Exercise, 07.10.2017.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Validation of a novel device to measure and provide feedback on sedentary behavior

AU - Gill, Jason M.R.

AU - Hawati, Nabeha S.A.

AU - Maxwell, Douglas J.

AU - Louden, David

AU - Mourselas, Nikos

AU - Bunn, Christopher

AU - Gray, Cindy M.

AU - van der Ploeg, Hidde P.

AU - Hunt, Kate

AU - Martin, Anne

AU - Wyke, Sally

AU - Mutrie, Nanette

PY - 2017/10/7

Y1 - 2017/10/7

N2 - Purpose: Pedometers, which enable self-monitoring of step counts, are effective in facilitating increases in physical activity. Similar devices which provide real-time feedback on sedentary (sitting) behavior are limited. This study aimed to develop and validate a novel device – the SitFIT – which could accurately measure and provide feedback on sedentary behavior and physical activity. Methods: The SitFIT is a tri-axial accelerometer, developed by PAL Technologies, which is worn in the front trouser pocket. This enables tracking of thigh inclination and therefore differentiation between sitting and upright postures, as well as tracking of step count. It has a display to provide user feedback. To determine the validity of the SitFIT for measuring sedentary behavior and step counts, 21 men, aged 30-65 years, with body mass index 26.6±3.9 kg.m-2 wore a SitFIT in a front trouser pocket and an activPAL accelerometer attached to their thigh for up to seven days. Outputs from the SitFIT were compared with the activPAL, which was assumed to provide gold-standard measurements of sitting and step counts. Results: Mean step counts were ~4% lower with the SitFIT than activPAL, with correlation between the two methods being very high (r=0.98) and no obvious bias from the line of equality (regression line: y=1.0035x+418.35). Mean sedentary time was ~5% higher with the SitFIT than activPAL, correlation between methods was high (r=0.84) and the equation of the regression line was close to the line of equality (y=0.8728x+38.445). Conclusions: The SitFIT has excellent validity for measurement of free-living step counts and sedentary time and therefore addresses a clear need for a device that can be used as a tool to provide feedback on sedentary behavior to facilitate behavior change.

AB - Purpose: Pedometers, which enable self-monitoring of step counts, are effective in facilitating increases in physical activity. Similar devices which provide real-time feedback on sedentary (sitting) behavior are limited. This study aimed to develop and validate a novel device – the SitFIT – which could accurately measure and provide feedback on sedentary behavior and physical activity. Methods: The SitFIT is a tri-axial accelerometer, developed by PAL Technologies, which is worn in the front trouser pocket. This enables tracking of thigh inclination and therefore differentiation between sitting and upright postures, as well as tracking of step count. It has a display to provide user feedback. To determine the validity of the SitFIT for measuring sedentary behavior and step counts, 21 men, aged 30-65 years, with body mass index 26.6±3.9 kg.m-2 wore a SitFIT in a front trouser pocket and an activPAL accelerometer attached to their thigh for up to seven days. Outputs from the SitFIT were compared with the activPAL, which was assumed to provide gold-standard measurements of sitting and step counts. Results: Mean step counts were ~4% lower with the SitFIT than activPAL, with correlation between the two methods being very high (r=0.98) and no obvious bias from the line of equality (regression line: y=1.0035x+418.35). Mean sedentary time was ~5% higher with the SitFIT than activPAL, correlation between methods was high (r=0.84) and the equation of the regression line was close to the line of equality (y=0.8728x+38.445). Conclusions: The SitFIT has excellent validity for measurement of free-living step counts and sedentary time and therefore addresses a clear need for a device that can be used as a tool to provide feedback on sedentary behavior to facilitate behavior change.

KW - sedentary

KW - sitting

KW - objective measurements

KW - validation

KW - behavior change

M3 - Article

JO - Medicine and Science in Sports and Exercise

T2 - Medicine and Science in Sports and Exercise

JF - Medicine and Science in Sports and Exercise

SN - 0195-9131

ER -

Gill JMR, Hawati NSA, Maxwell DJ, Louden D, Mourselas N, Bunn C et al. Validation of a novel device to measure and provide feedback on sedentary behavior. Medicine and Science in Sports and Exercise. 2017 Oct 7.