Defining accelerometer thresholds for activity intensities in adolescent girls

Margarita S. Treuth, Kathryn Schmitz, Diane J. Catellier, Robert G. McMurray, David M. Murray, M. Joao Almeida, Scott Going, James E. Norman, Russell Pate

Research output: Contribution to journalArticle

433 Citations (Scopus)

Abstract

Purpose: To derive a regression equation that estimates metabolic equivalent (MET) from accelerometer counts, and to define thresholds of accelerometer counts that can be used to delineate sedentary, light, moderate, and vigorous activity in adolescent girls. Methods: Seventy-four healthy 8th grade girls, age 13-14 yr, were recruited from urban areas of Baltimore, MD, Minneapolis/St. Paul, MN, and Columbia, SC, to participate in the study. Accelerometer and oxygen consumption (V̇O2) data for 10 activities that varied in intensity from sedentary (e.g., TV watching) to vigorous (e.g., running) were collected. While performing these activities, the girls wore two accelerometers, a heart rate monitor and a Cosmed K4b2 portable metabolic unit for measurement of V̇O2. A random-coefficients model was used to estimate the relationship between accelerometer counts and V̇O2. Activity thresholds were defined by minimizing the false positive and false negative classifications. Results: The activities provided a wide range in V̇O2 (3-36 mL·kg -1·min-1) with a correspondingly wide range in accelerometer counts (1-3928 counts·30 s-1). The regression line for MET score versus counts was MET = 2.01 + 0.00171 (counts·30 s-1) (mixed model R2 = 0.84, SEE = 1.36). A threshold of 1500 counts·30 s-1 defined the lower end of the moderate intensity (∼4.6 METs) range of physical activity. That cutpoint distinguished between slow and brisk walking, and gave the lowest number of false positive and false negative classifications. The threshold ranges for sedentary, light, moderate, and vigorous physical activity were found to be 0-50, 51-1499, 1500-2600, and >2600 counts·30 s-1, respectively. Conclusion: The developed equation and these activity thresholds can be used for prediction of MET score from accelerometer counts and participation in various intensities of physical activity in adolescent girls.

Original languageEnglish (US)
Pages (from-to)1259-1266
Number of pages8
JournalMedicine and Science in Sports and Exercise
Volume36
Issue number7
StatePublished - Jul 1 2004

Fingerprint

Metabolic Equivalent
Exercise
Light
Baltimore
Oxygen Consumption
Running
Walking
Heart Rate

All Science Journal Classification (ASJC) codes

  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

Cite this

Treuth, M. S., Schmitz, K., Catellier, D. J., McMurray, R. G., Murray, D. M., Almeida, M. J., ... Pate, R. (2004). Defining accelerometer thresholds for activity intensities in adolescent girls. Medicine and Science in Sports and Exercise, 36(7), 1259-1266.
Treuth, Margarita S. ; Schmitz, Kathryn ; Catellier, Diane J. ; McMurray, Robert G. ; Murray, David M. ; Almeida, M. Joao ; Going, Scott ; Norman, James E. ; Pate, Russell. / Defining accelerometer thresholds for activity intensities in adolescent girls. In: Medicine and Science in Sports and Exercise. 2004 ; Vol. 36, No. 7. pp. 1259-1266.
@article{3156f9988d374e2385ef1f8d59e30aaa,
title = "Defining accelerometer thresholds for activity intensities in adolescent girls",
abstract = "Purpose: To derive a regression equation that estimates metabolic equivalent (MET) from accelerometer counts, and to define thresholds of accelerometer counts that can be used to delineate sedentary, light, moderate, and vigorous activity in adolescent girls. Methods: Seventy-four healthy 8th grade girls, age 13-14 yr, were recruited from urban areas of Baltimore, MD, Minneapolis/St. Paul, MN, and Columbia, SC, to participate in the study. Accelerometer and oxygen consumption (V̇O2) data for 10 activities that varied in intensity from sedentary (e.g., TV watching) to vigorous (e.g., running) were collected. While performing these activities, the girls wore two accelerometers, a heart rate monitor and a Cosmed K4b2 portable metabolic unit for measurement of V̇O2. A random-coefficients model was used to estimate the relationship between accelerometer counts and V̇O2. Activity thresholds were defined by minimizing the false positive and false negative classifications. Results: The activities provided a wide range in V̇O2 (3-36 mL·kg -1·min-1) with a correspondingly wide range in accelerometer counts (1-3928 counts·30 s-1). The regression line for MET score versus counts was MET = 2.01 + 0.00171 (counts·30 s-1) (mixed model R2 = 0.84, SEE = 1.36). A threshold of 1500 counts·30 s-1 defined the lower end of the moderate intensity (∼4.6 METs) range of physical activity. That cutpoint distinguished between slow and brisk walking, and gave the lowest number of false positive and false negative classifications. The threshold ranges for sedentary, light, moderate, and vigorous physical activity were found to be 0-50, 51-1499, 1500-2600, and >2600 counts·30 s-1, respectively. Conclusion: The developed equation and these activity thresholds can be used for prediction of MET score from accelerometer counts and participation in various intensities of physical activity in adolescent girls.",
author = "Treuth, {Margarita S.} and Kathryn Schmitz and Catellier, {Diane J.} and McMurray, {Robert G.} and Murray, {David M.} and Almeida, {M. Joao} and Scott Going and Norman, {James E.} and Russell Pate",
year = "2004",
month = "7",
day = "1",
language = "English (US)",
volume = "36",
pages = "1259--1266",
journal = "Medicine and Science in Sports and Exercise",
issn = "0195-9131",
publisher = "Lippincott Williams and Wilkins",
number = "7",

}

Treuth, MS, Schmitz, K, Catellier, DJ, McMurray, RG, Murray, DM, Almeida, MJ, Going, S, Norman, JE & Pate, R 2004, 'Defining accelerometer thresholds for activity intensities in adolescent girls', Medicine and Science in Sports and Exercise, vol. 36, no. 7, pp. 1259-1266.

Defining accelerometer thresholds for activity intensities in adolescent girls. / Treuth, Margarita S.; Schmitz, Kathryn; Catellier, Diane J.; McMurray, Robert G.; Murray, David M.; Almeida, M. Joao; Going, Scott; Norman, James E.; Pate, Russell.

In: Medicine and Science in Sports and Exercise, Vol. 36, No. 7, 01.07.2004, p. 1259-1266.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Defining accelerometer thresholds for activity intensities in adolescent girls

AU - Treuth, Margarita S.

AU - Schmitz, Kathryn

AU - Catellier, Diane J.

AU - McMurray, Robert G.

AU - Murray, David M.

AU - Almeida, M. Joao

AU - Going, Scott

AU - Norman, James E.

AU - Pate, Russell

PY - 2004/7/1

Y1 - 2004/7/1

N2 - Purpose: To derive a regression equation that estimates metabolic equivalent (MET) from accelerometer counts, and to define thresholds of accelerometer counts that can be used to delineate sedentary, light, moderate, and vigorous activity in adolescent girls. Methods: Seventy-four healthy 8th grade girls, age 13-14 yr, were recruited from urban areas of Baltimore, MD, Minneapolis/St. Paul, MN, and Columbia, SC, to participate in the study. Accelerometer and oxygen consumption (V̇O2) data for 10 activities that varied in intensity from sedentary (e.g., TV watching) to vigorous (e.g., running) were collected. While performing these activities, the girls wore two accelerometers, a heart rate monitor and a Cosmed K4b2 portable metabolic unit for measurement of V̇O2. A random-coefficients model was used to estimate the relationship between accelerometer counts and V̇O2. Activity thresholds were defined by minimizing the false positive and false negative classifications. Results: The activities provided a wide range in V̇O2 (3-36 mL·kg -1·min-1) with a correspondingly wide range in accelerometer counts (1-3928 counts·30 s-1). The regression line for MET score versus counts was MET = 2.01 + 0.00171 (counts·30 s-1) (mixed model R2 = 0.84, SEE = 1.36). A threshold of 1500 counts·30 s-1 defined the lower end of the moderate intensity (∼4.6 METs) range of physical activity. That cutpoint distinguished between slow and brisk walking, and gave the lowest number of false positive and false negative classifications. The threshold ranges for sedentary, light, moderate, and vigorous physical activity were found to be 0-50, 51-1499, 1500-2600, and >2600 counts·30 s-1, respectively. Conclusion: The developed equation and these activity thresholds can be used for prediction of MET score from accelerometer counts and participation in various intensities of physical activity in adolescent girls.

AB - Purpose: To derive a regression equation that estimates metabolic equivalent (MET) from accelerometer counts, and to define thresholds of accelerometer counts that can be used to delineate sedentary, light, moderate, and vigorous activity in adolescent girls. Methods: Seventy-four healthy 8th grade girls, age 13-14 yr, were recruited from urban areas of Baltimore, MD, Minneapolis/St. Paul, MN, and Columbia, SC, to participate in the study. Accelerometer and oxygen consumption (V̇O2) data for 10 activities that varied in intensity from sedentary (e.g., TV watching) to vigorous (e.g., running) were collected. While performing these activities, the girls wore two accelerometers, a heart rate monitor and a Cosmed K4b2 portable metabolic unit for measurement of V̇O2. A random-coefficients model was used to estimate the relationship between accelerometer counts and V̇O2. Activity thresholds were defined by minimizing the false positive and false negative classifications. Results: The activities provided a wide range in V̇O2 (3-36 mL·kg -1·min-1) with a correspondingly wide range in accelerometer counts (1-3928 counts·30 s-1). The regression line for MET score versus counts was MET = 2.01 + 0.00171 (counts·30 s-1) (mixed model R2 = 0.84, SEE = 1.36). A threshold of 1500 counts·30 s-1 defined the lower end of the moderate intensity (∼4.6 METs) range of physical activity. That cutpoint distinguished between slow and brisk walking, and gave the lowest number of false positive and false negative classifications. The threshold ranges for sedentary, light, moderate, and vigorous physical activity were found to be 0-50, 51-1499, 1500-2600, and >2600 counts·30 s-1, respectively. Conclusion: The developed equation and these activity thresholds can be used for prediction of MET score from accelerometer counts and participation in various intensities of physical activity in adolescent girls.

UR - http://www.scopus.com/inward/record.url?scp=3042734797&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=3042734797&partnerID=8YFLogxK

M3 - Article

C2 - 15235335

AN - SCOPUS:3042734797

VL - 36

SP - 1259

EP - 1266

JO - Medicine and Science in Sports and Exercise

JF - Medicine and Science in Sports and Exercise

SN - 0195-9131

IS - 7

ER -

Treuth MS, Schmitz K, Catellier DJ, McMurray RG, Murray DM, Almeida MJ et al. Defining accelerometer thresholds for activity intensities in adolescent girls. Medicine and Science in Sports and Exercise. 2004 Jul 1;36(7):1259-1266.