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Site-specific Concurrent Validity of the Actigraph GT9X Link in the Estimation of Activity-related Skeletal Loading.

Abstract：

:To inform the development of bone-specific physical activity (PA) assessment methods and contribute to bone-specific PA guidelines, accelerometer outcomes that provide the most valid estimates of skeletal loading in adults must be identified. PURPOSE:The aims of this project were two-fold. First, to assess the concurrent validity of raw accelerometer outputs with ground reaction forces (GRFs) and loading rates (LRs) calculated from force plate across a range of simulated habitual physical activities. Second, to identify the optimal wear site among the ankle, hip, and wrist with the strongest relationships between accelerometer and force plate and/or skeletal outcomes. METHODS:Thirty healthy young adults (23.0 ± 4.5 years, 50% female) wore a tri-axial accelerometer at the right ankle, hip, and wrist whilst performing eight trials of walking, jogging, running, low box drops, and high box drops over an in-ground force plate. Repeated measures correlations and linear mixed models were used to assess concurrent validity of accelerometer and force plate outcomes across wear sites. RESULTS:Strong repeated measures associations were observed between peak hip resultant acceleration and resultant LRs (rrm 1169 = 0.74, p<0.001, 95% CI: 0.718, 0.769), and peak hip vertical accelerations and vertical LRs (rrm 1169 = 0.69, p<0.001, 95% CI: 0.660, 0.720) when data were combined across activities. Whereas, small to moderate associations were seen between ankle-based outcomes and corresponding GRFs and LRs during walking and jogging (rrm 209 = 0.17 - 0.34, all p<0.001). No significant associations were seen with wrist-based outcomes during any activity. In addition, linear mixed models suggested that 24 - 50% of the variability in peak GRFs and LRs could be attributed to measured accelerations at the hip. CONCLUSION:Peak accelerations measured at the hip were identified as the strongest proxies for skeletal loading assessed via force plate.

journal_name

Med Sci Sports Exerc

journal_title

Medicine and science in sports and exercise

authors

Higgins S,Higgins LQ,Vallabhajosula S

doi

10.1249/MSS.0000000000002562

subject

Has Abstract

pub_date

2020-11-07 00:00:00

eissn

0195-9131

issn

1530-0315

pub_type

杂志文章

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Site-specific Concurrent Validity of the Actigraph GT9X Link in the Estimation of Activity-related Skeletal Loading.