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Ergonomics. 2015;58(6):953-65. doi: 10.1080/00140139.2014.998724. Epub 2015 Jan 15.

Validity of the Acti4 method for detection of physical activity types in free-living settings: comparison with video analysis.

Author information

1
a National Research Centre for the Working Environment , Copenhagen , Denmark.

Abstract

This study examined the ability of the Acti4 software for identifying physical activity types from accelerometers during free-living with different levels of movement complexity compared with video observations. Nineteen aircraft cabin cleaners with ActiGraph GT3X+ accelerometer at the thigh and hip performed one semi-standardised and two non-standardised sessions (outside and inside aircraft) with different levels of movement complexity during working hours. The sensitivity for identifying different activity types was 75.4-99.4% for the semi-standardised session, 54.6-98.5% outside the aircraft and 49.9-90.2% inside the aircraft. The specificity was above 90% for all activities, except 'moving' inside the aircraft. These findings indicate that Acti4 provides good estimates of time spent in different activity types during semi-standardised conditions, and for sitting, standing and walking during non-standardised conditions with normal level of movement complexity. The Acti4 software may be a useful tool for researchers and practitioners in the field of ergonomics, occupational and public health. Practitioner Summary: Being inexpensive, small, water-resistant and without wires, the ActiGraph GT3X+ by applying the Acti4 software may be a useful tool for long-term field measurements of physical activity types for researchers and practitioners in the field of ergonomics, occupational and public health.

KEYWORDS:

Acti4; ActiGraph; accelerometry; occupational; validation

PMID:
25588819
DOI:
10.1080/00140139.2014.998724
[Indexed for MEDLINE]

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