Evaluation of a wearable body monitoring device during treadmill walking and jogging in patients with fibromyalgia syndrome.
OBJECTIVE
To evaluate the reliability and validity of a body monitoring device against measures obtained from indirect calorimetry (IC) in patients with fibromyalgia syndrome (FMS) during various incremental exercise intensities.


METHODS
Cross-sectional reliability and validity study.


METHODS
Testing was completed in a university exercise physiology laboratory.


METHODS
Women (N=25) with FMS, with a mean age ± SD of 48.6±8.4 years and a median symptom duration of 15 years (25th-75th percentiles, 10-23y), were recruited to the study.


METHODS
Not applicable.


METHODS
Patients walked and jogged on a treadmill at 4 intensities (50m·min(-1), 0% grade [n=25]; 83.3m·min(-1), 0% grade [n=25]; 116.7m·min(-1), 0% grade [n=21]; 116.7m·min(-1), 2.5% grade [n=13]) during 2 measurement conditions, while IC and a multiple-sensor body monitor measured energy expenditure (EE). The differences between the readings (test 1 - test 2) and the SD of the differences, intraclass correlation coefficient (ICC), 95% confidence interval (CI) for the ICC, coefficient of repeatability, intrapatient SD, standard error of mean (SEM), minimal detectable change, Wilcoxon signed-rank test, and Bland-Altman graphs were used to examine reliability. The magnitude of the associations between IC and the body monitoring device, ICC, 95% CI for the ICC, paired t tests, and Bland-Altman graphs were used to examine the validity of the body monitoring device versus the IC.


RESULTS
Moderate to excellent test-retest reliability was found for the 4 bouts of exercise (ICC=.73-.76). The SEM and minimal detectable change were satisfactory for the 4 bouts of exercise (.54-1.18kcal·min(-1) and 1.51-3.28kcal·min(-1), respectively). The differences mean between test and retest were lower than the SEM for the 4 bouts of exercise, varying from -.17 to .14kcal·min(-1). No significant differences were found between test and retest for any bout. The Bland-Altman plots and the coefficients of repeatability indicated that the differences between repeated tests would lie within 2 SDs in 95% of the cases for the 4 bouts of exercise. Significant associations were found between the body monitoring device and IC measurements of EE for the 4 bouts of exercise (r=.87-.99). The differences for all bouts between the 2 methods were nonsignificant, except for the second bout (P<.001). The ICCs and Bland-Altman plots of EE for the 4 bouts showed high agreement (ICCs=.84-.99) and sufficient accuracy for quantifying EE during exercise in patients with FMS.


CONCLUSIONS
The body monitoring device provided a valid and reliable estimate of EE in patients with FMS during walking on horizontal and inclined surfaces in a laboratory setting across various exercise intensities.
Section of Physical Education and Sports, University Pablo de Olavide, Seville, Spain. dmunizq@upo.es
Diego
D
Munguía-Izquierdo
Alfredo
A
Santalla
Alejandro
A
Legaz-Arrese
D000328:Adult; D002153:Calorimetry, Indirect / Q000295:instrumentation*; D016001:Confidence Intervals; D003430:Cross-Sectional Studies; D004734:Energy Metabolism / Q000502:physiology*; D004867:Equipment Design; D005080:Exercise Test; D017079:Exercise Tolerance / Q000502:physiology; D005260:Female; D005356:Fibromyalgia / Q000175:diagnosis* / Q000378:metabolism; D006801:Humans; D007590:Jogging / Q000502:physiology; D008297:Male; D008875:Middle Aged; D008991:Monitoring, Physiologic / Q000295:instrumentation* / Q000379:methods; D015203:Reproducibility of Results; D012720:Severity of Illness Index; D018709:Statistics, Nonparametric; D016138:Walking / Q000502:physiology