Monopodal postural stability assessment by wireless inertial measurement units through the fast fourier transform
Gómez Carmona, Carlos D.
Ibáñez, Sergio J.
Objectives: (1) To describe the fast Fourier transform (FFT) multijoint as monopodal postural stability measurement in well-trained athletes, (2) to compare the within-subject FFT between laterality, joints, and body segments, and (3) to establish the within- and between-subject relationship between joints. Methods: Twelve national-level basketball players participated voluntarily in this investigation. The participants performed two 60-second repetitions of a monopodal stability test (1 repetition with each lower limb), separated by 3 minutes of active recovery. All tests were recorded by 4 WIMU PRO™ inertial devices located on the ankle, knee, lumbar spine, and thoracic spine. The main variable was total acceleration, where the FFT was applied. Results: The higher instability results were found in the ankle and in the nondominant lower limb (dominant = 1.131 [0.122] a.u. (arbitrary units); nondominant = 1.141 [0.172] a.u). In the body segment analysis, the greater percentage of differences (%diff) were shown between lumbar spine and knee in the dominant (%diff = −2.989%; d = 0.87) and nondominant (%diff = −3.243%; d = 0.90) lower limb. Finally, very large between-subjects variability was found in all joints and body segments. Conclusions: The described protocol is proposed for monopodal postural stability assessment, being useful to provide information about the stability of joints and the body segment between joints. Besides, a within-subject analysis is recommended, and the FFT calculation will enable a linear analysis of each test.
Showing items related by title, author, creator and subject.
Static and dynamic reliability of WIMU PRO™ accelerometers according to anatomical placement (2020) Gómez-Carmona C.D.; Bastida-Castillo A.; García-Rubio J.; Ibáñez S.J.; Pino-Ortega J. (SAGE Publications Ltd, 2019)
Validity and reliability of the WIMU inertial device for the assessment of the vertical jump (2020) Pino-Ortega J.; García-Rubio J.; Ibáñez S.J. (PeerJ Inc., 2018)
Validity and reliability of the WIMUTM inertial device for the assessment of joint angulations (2020) García-Rubio J.; Pino J.; Olivares P.R.; Ibáñez S.J. (MDPI AG, 2020)