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- Ekvall Hansson, Eva, et al.
(författare)
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Coherence and reliability of a wearable inertial measurement unit for measuring postural sway
- 2019
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Ingår i: BMC Research Notes. - : Springer Science and Business Media LLC. - 1756-0500. ; 12:1, s. 1-5
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Tidskriftsartikel (refereegranskat)abstract
- OBJECTIVE: The aim of this study was to test the coherence of a wearable device, an inertial measurement unit (IMU) against the gold standard; also, to test the intra-trial reliability. This study has a cross-sectional design, where measurement of postural sway in the medio-lateral and anterior-posterior directions was performed simultaneously on a force plate and with a IMU called the Snubblometer ("snubbla" is stumble in Swedish). Thirty-two healthy volunteers participated in the tests.RESULTS: The coherence between the IMU and the force plate was 0.84 (strong) in the medio-lateral direction with eyes open (EO) and 0.88 (strong) with eyes closed (EC). The ICC for intra-trial reliability for the IMU varied between 0.50 and 0.67 (moderate to good) with a CV between 17.8 and 22.1% and ICC varied between 0.75 and 0.86 (good) for inter-trial reliability, with an SEM of 0.98 to 1.96 mm/s. We have demonstrated that the IMU was both reliable and highly coherent with golden standard, although the two assessment methods were not interchangeable. The ability to move the balance lab out into real life in the form of a wearable device will provide opportunities to perform research that has not been possible before.
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| 2. |
- Hilmersson, Marie, et al.
(författare)
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Power of counter movement jumps with external load : coherence of three assessment methods
- 2015
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Ingår i: BMC Research Notes. - : BioMed Central (BMC). - 1756-0500. ; 8:1
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Tidskriftsartikel (refereegranskat)abstract
- Background: The purpose of this study was to evaluate the coherence between three different methods assessing the power driven from a counter movement jump (CMJ); the Powertimer 300-series contact mat (C-mat), the MuscleLab 4010 infrared mat (IR-mat) and the MuscleLab 4010 linear encoder (M-encoder), and to evaluate the test-retest reliability of the M-encoder.Methods: Twenty-two males and 29 female, elite athletes performed two test sessions with three days in between. Each test session included counter movement jumps (CMJ) performed on a Smith-machine with external loads of 40 kg. Jump height and flight time were assessed with C-mat and IR-mat, and power was additionally assessed with C-mat. Variables analyzed from the M-encoder were average power (AP), average force (AV), average velocity (AV), and distance (D).Results: The results from the C-mat were systematically higher than the ones obtained from the M-encoder and IR-mat. The correlation between the C-mat, M-encoder and the IR-mat was strong (rp∈=∈0.95-0.98). The results showed a high test-retest reliability for all indices assessed with the M-encoder, AP (rp∈=∈0.97, p∈<∈0.001; TE%∈=∈3.9%), AF (rp∈=∈0.99, p∈<∈0.001; TE%∈=∈1.4%). Furthermore, the AV had high values (rp∈=∈0.94, p∈<∈0.001; TE%∈=∈2.9%) as well as D (rp∈=∈0.87, p∈<∈0.001; TE%∈=∈5.4%).Conclusion: It is important to use the same equipment in both pre- and post-testing, since all three methods were reliable, coherent but not interchangeable to each other.
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