Technical variability of the RT3 accelerometer

Powell, Sarah M. and Jones, Dewi and Rowlands, Ann V. (2003) Technical variability of the RT3 accelerometer. Medicine and Science in Sports and Exercise, 35 (10). pp. 1773-1778. ISSN 0195-9131

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Abstract

Purpose To evaluate the technical performance of the RT3 triaxial accelerometer. Methods Twenty-three RT3 accelerometers were subjected to a specific vibration along each sensitive axis in isolation, using a motorized vibration table that produced frequencies of 2.1, 5.1, and 10.2 Hz, respectively. Data were analyzed for frequency and axis effects and inter- and intra-instrument variability. Results ANOVA showed a frequency by axis interaction ( F 2.1,36.8 = 19.9, P < 0.001). Post hoc tests revealed the Y axis count to be significantly higher than the X and Z axes counts at 5.1 and 10.2 Hz. There was no difference in counts between axes at 2.1 Hz. Interinstrument coefficients of variation (CV) decreased as frequency increased (21.9 to 26.7% at 2.1 Hz, 6.3 to 9.0% at 5.1 Hz, and 4.2 to 7.2% at 10.2 Hz). The intraclass correlation (ICC) between RT3s was 0.99, regardless of the axis. Intra-instrument CV also decreased as frequency increased (2.1 to 56.2%, 0.3 to 2.5%, and 0.2 to 2.9% at 2.1, 5.1, and 10.2 Hz, respectively. Conclusion There were no differences in counts recorded on the X, Y, and Z axes at 2.1 Hz; however, the counts recorded along the Y axis were significantly higher than the counts at the X and Z axes at 5.1 and 10.2 Hz. Due to large coefficients of variation for both inter- and intra-instrument variability at 2.1 Hz, testing the inter- and intra-instrument variability of the accelerometers before use is recommended.

Item Type:
Journal Article
Journal or Publication Title:
Medicine and Science in Sports and Exercise
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3600/3612
Subjects:
ID Code:
161056
Deposited By:
Deposited On:
18 Oct 2021 10:05
Refereed?:
Yes
Published?:
Published
Last Modified:
19 Nov 2021 12:04