Comparison of two accelerometer generations in physical activity and sedentary behaviour surveillance among health care workers in free living environments
ISPAH ePoster Library. Yano S. Oct 15, 2018; 225209; 323
Shohei Yano
Shohei Yano
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Abstract
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Abstract Introduction. Accurate measurement of physical activity (PA) and sedentary behavior (SB) is an important step in developing strategies to promote active lifestyle. Accelerometers have been commonly used to objectively measure PA and SB. The purpose of this study was to determine whether data collected by the new generation of tri-axial accelerometers are comparable with those of old generation among health care workers in free living environment.Methods. Data were from 12 health care workers (28—54 years), who wore two types of Active style Pro accelerometers including HJA350IT (350IT) and HJA750C (750C) simultaneously on their hip for 7 consecutive days. The daily average time spent on SB (≦1.5 METs), light (LPA, >1.5 to <3.0METs), moderate (MPA, >3.0 to <6.0METs), and vigorous (VPA, ≧6.0METs)were calculated. The difference and agreement between devices were analysed using paired t-test and Bland-Altman plots.Result. There were no significant differences between the means of accelerometer wearing time between two devices (807.3±80.7, 809.9±81.8). The 750C version measured more time of LPA and less time of MPA, and VPA than the 350IT one. There was no difference in SB. LPA had most significant differences (23.2 minutes, p<0.01). Bland–Altman analysis displayed systematic bias in LPA (r = 0.59, p < 0.05).Conclusions. The outputs of the new and old generations of tri-axial accelerometers were different in assessing free living PA, but not for measuring SB. Public health researchers and practitioners need to take into account these differences, when using different types of devices interchangeably for health care workers.
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