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Arch Phys Med Rehabil. 2010 Aug;91(8):1283-90. doi: 10.1016/j.apmr.2010.04.026.

Physical activity measurement using MTI (actigraph) among children with cerebral palsy.

Author information

1
Institute of Human Performance, University of Hong Kong, Hong Kong, China. ccapio08@hku.hk

Abstract

OBJECTIVE:

To investigate the validity of MTI accelerometer as a physical activity (PA) measurement instrument for children with cerebral palsy (CP).

DESIGN:

Participants were classified within Gross Motor Function Classification System I to III and took part in 2 activity sessions: (1) a structured activity protocol with increasing intensities and (2) a free play session. Concurrent measurements of activity counts, heart rate, and observed physical activity were performed.

SETTING:

Data were collected on normal school days in special schools within the participants' 30-minute break period.

PARTICIPANTS:

Convenience sample of children with CP (N=31; 17 girls, 14 boys) age between 6 and 14 years (mean +/- SD, 9.71+/-2.52 y).

INTERVENTIONS:

Not applicable.

MAIN OUTCOME MEASURES:

MTI measured activity counts, a monitoring device measured heart rate, and the System for Observing Fitness Instruction Time (SOFIT) was used for direct PA observation.

RESULTS:

There were strong relationships between MTI and SOFIT (r=.75; R(2)=.56; P<.001) and heart rate monitor (HRM) and SOFIT (r=.65; R(2)=.43; P<.001) data in structured activities, but the difference between these 2 correlation coefficients was not significant (P=.46). In free play activities, the association between MTI and SOFIT data (r=.67; R(2)=.45; P<.001) was significantly stronger (P=.01) than that between heart rate and SOFIT data (r=.14; R(2)=.02; P<.001) . Bland-Altman plots showed better agreement between observed SOFIT and MTI-predicted SOFIT data than observed SOFIT and HRM-predicted SOFIT data from the linear regression analysis.

CONCLUSIONS:

The findings suggest that the MTI appears to be a valid instrument for measuring raw activity volume among children with CP and is suitable for use in studies attempting to characterize the PA of this population.

PMID:
20684912
DOI:
10.1016/j.apmr.2010.04.026
[Indexed for MEDLINE]

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