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Leppe J.1, Bluhm S.1, Diaz O.2
1Universidad del Desarrollo, School of Physical Therapy, Santiago, Chile, 2Pontifica Universidad Católica de Chile, Respiratory Care, Santiago, Chile
Background: Physical activity is an important clinical parameter related to morbidity and mortality in many chronic diseases. In chronic obstructive pulmonary disease (COPD) the level of physical activity reported by patients is related to lung function decline, hospitalizations and mortality.
Purpose: Self-reported physical activity is often subject to recall bias, correlates only poorly with objectively quantified physical activity in patients with COPD, and does not provide an accurate estimate of free-living energy expenditure. The present study aimed to measure physical activity in patients with COPD using objective and subjective methods.
Methods: Sixty-three patients with COPD were recruited, the participants wore an accelerometer (ActiGraph-GT3X) for 7 consecutive days and then completed the diaries each day, during one week. In the activity record, a day was divided into 96 periods of 15 min each. For each 15-min period, energy expenditure was qualified on a 1 to 9 scale. These categories were explained and illustrated in detail for the participant in written material given to him or her for personal use. The accelerometers were attached to an elastic waist belt over the right iliac crest. Participants were asked to wear the accelerometer from the moment they woke up until they went to bed at night, and requested to remove it only during water-based activities such as showering and swimming. The accelerometers data were included in the analyses if participants had at least 10 h of wear time on any 4 days of the week. All data found in diaries were included. To describe the study sample, means and standard deviations were presented for normally distributed continuous variables, and percentages for categorical variables. To describe physical activity percentages and median for not-normally distributed were used. Spearman was used for correlation minutes physical activity between diaries versus accelerometers.
Results: A total of n=46 responses were collected, 64.1% were women, with a mean age of 66±7 years, BMI mean was 26.2±3.3.
According to diaries during week the people spent 40.1% in sleep, 26.6% sedentary behavior, 24.6% light, 8.4% moderate and 0.2% in vigorous physical activity.
Physical activity minutes per day in the Light, Moderate and Vigorous comparing diaries versus accelerometers were: Light P50=324.6 v/s P50=740.6 min/day, Moderate P50=50.4 v/s P50=26.0 min/day and Vigorous P50=0 v/s P50=0 min/day respectively.
We found No statically significant spearmen correlation for light and moderate intensities p>0.05. For vigorous intensity spearman´s rho was 0.42 p=0.02.
Conclusion(s): The physical activity in this patients is low, coincidently to Chilean national population according to sex and age. The record diary is useful to report physical activity patterns, but presents measurement bias.
Implications: The record diary can be used for measuring physical activity in clinical settings, such as the participation of a cardiorespiratory training program.
For physical activity research, it is necessary to complement the use of record diary with objective methods as accelerometers or podometers.
Funding acknowledgements: The study was supported by CONICYT proyect Nº1141108. Chile Goverment
Topic: Cardiorespiratory
Ethics approval: The study was approved by Research Ethics Committe Of Pontificia Universidad Católica de Chile.
All authors, affiliations and abstracts have been published as submitted.
