TY  - JOUR
A1  - Meyer, Ursina
A1  - Ernst, Dominique
A1  - Schott, Silvia
A1  - Riera, Claudia
A1  - Hattendorf, Jan
A1  - Romkes, Jacqueline
A1  - Granacher, Urs
A1  - Göpfert, Beat
A1  - Kriemler, Susi
T1  - Validation of two accelerometers to determine mechanical loading of physical activities in children
JF  - Journal of sports sciences
N2  - The purpose of this study was to assess the validity of accelerometers using force plates (i.e., ground reaction force (GRF)) during the performance of different tasks of daily physical activity in children. Thirteen children (10.1 (range 5.4-15.7)years, 3 girls) wore two accelerometers (ActiGraph GT3X+ (ACT), GENEA (GEN)) at the hip that provide raw acceleration signals at 100Hz. Participants completed different tasks (walking, jogging, running, landings from boxes of different height, rope skipping, dancing) on a force plate. GRF was collected for one step per trial (10 trials) for ambulatory movements and for all landings (10 trials), rope skips and dance procedures. Accelerometer outputs as peak loading (g) per activity were averaged. ANOVA, correlation analyses and Bland-Altman plots were computed to determine validity of accelerometers using GRF. There was a main effect of task with increasing acceleration values in tasks with increasing locomotion speed and landing height (P<0.001). Data from ACT and GEN correlated with GRF (r=0.90 and 0.89, respectively) and between each other (r=0.98), but both accelerometers consistently overestimated GRF. The new generation of accelerometer models that allow raw signal detection are reasonably accurate to measure impact loading of bone in children, although they systematically overestimate GRF.
KW  - bone
KW  - impact loading
KW  - children
KW  - physical activity
KW  - ground reaction force
Y1  - 2015
U6  - https://doi.org/10.1080/02640414.2015.1004638
SN  - 0264-0414
SN  - 1466-447X
VL  - 33
IS  - 16
SP  - 1702
EP  - 1709
PB  - Routledge, Taylor & Francis Group
CY  - Abingdon
ER  -