| Technical variability of the RT3 accelerometer. | |
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MedLine Citation:
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PMID: 14523319 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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 (F2.1,36.8 = 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. |
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Authors:
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Sarah M Powell; Dewi I Jones; Ann V Rowlands |
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Publication Detail:
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Type: Evaluation Studies; Journal Article |
Journal Detail:
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Title: Medicine and science in sports and exercise Volume: 35 ISSN: 0195-9131 ISO Abbreviation: Med Sci Sports Exerc Publication Date: 2003 Oct |
Date Detail:
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Created Date: 2003-10-02 Completed Date: 2004-04-06 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8005433 Medline TA: Med Sci Sports Exerc Country: United States |
Other Details:
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Languages: eng Pagination: 1773-8 Citation Subset: IM; S |
Affiliation:
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School of Sport, Health and Exercise Sciences, University of Wales, Bangor LL57 2PX, Wales, UK. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Acceleration Monitoring, Physiologic / instrumentation* Vibration |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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