Measuring Lumbar Motion Angle With a Small Accelerometer: A Reliability Study

Miyachi, Ryo; Sano, Ayaka; Tanaka, Nana; Tamai, Misaki; Miyazaki, Junichi

doi:10.1016/j.jcm.2022.02.010

Cited by 3 publications

(2 citation statements)

References 27 publications

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“…An athlete's torsional angle and shoulder joint rotation and adduction are important influencing factors in hitting backhands. The functional axial rotation angle of the lumbar spine is between 2 • and 7 • [50]. A long-haul backhand shot obviously produces a higher electrical signal.…”

Section: Resultsmentioning

confidence: 99%

A Portable and Low-Cost Triboelectric Nanogenerator for Wheelchair Table Tennis Monitoring

et al. 2022

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With progress in fifth-generation techniques, more advanced techniques are available for disabled people. Disability table tennis has also benefited from the new technology. In this paper, a portable and low-cost triboelectric nanogenerator for wheelchair table tennis monitoring systems is proposed. It was applied for wheelchair table tennis athletes’ monitoring. The portable and low-cost triboelectric nanogenerator consists of Kapton, polyurethane triboelectric films, and a foam supporting layer. The materials have flexible and low-cost characteristics. Therefore, the device has no influence on exercise performance. Due to triboelectric and electrostatic induction, the portable and low-cost triboelectric nanogenerator can convert biomechanical signals into electric signals. The electric signal is used as a sensing signal and is transformed in a computer by an Analog-to-Digital acquisition module. The coach acquires motion information in real time from a terminal device regarding force, exercise amplitude, and stability of the athlete. Meanwhile, the electric signal provides also sustainable energy for the microelectronic device. It can light 20 LEDs easily and power a calculator and a watch. This portable and low-cost self-powered triboelectric nanogenerator offers a new approach to the field of motion monitoring for disabled people.

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Section: Resultsmentioning

confidence: 99%

A Portable and Low-Cost Triboelectric Nanogenerator for Wheelchair Table Tennis Monitoring

et al. 2022

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“…However, this would only be the case if the sensors were not removed so as to avoid introducing reattachment orientation error. Lower estimates of between-day reliability commonly feature in the literature [8,35], where some of the additional error may be due to initial sensor orientation. The mathematical correction demonstrated here suggests that this error can be resolved, removing the variability and effect of differing sensor orientations.…”

Section: Discussionmentioning

confidence: 99%

Assessing the Impact of Sensor Orientation on Accelerometer-Derived Angles: A Systematic Analysis and Proposed Error Reduction

McClintock,

Callaway,

Clark

et al. 2024

Applied Sciences

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Accelerometers have been widely used for motion analysis. The effect of initial sensor orientation (ISO) on the derived range of motion (ROM) is currently unexplored, limiting clarity in understanding error. This two-step study systematically explored the effect of ISO on the error of accelerometer-derived range of motion (ROM) and the effect of a proposed correction algorithm. Accelerometer data were used to compute peak and through-range ROM across a range of ISO and movement angular velocities up to 148° s−1 compared to an optoelectronic gold-standard. Step 1 demonstrated that error increased linearly with increasing ISO offsets and angular velocity. Average peak ROM RMSE at an ISO of 20° tilt and twist was 5.9° for sagittal motion, and for an ISO of 50° pitch and 20° twist, it was 7.5° for frontal plane ROM. Through-range RMSE demonstrated errors of 7–8° for similar ISOs. Predictive modeling estimated a 3.2° and 3.7° increase in peak and through-range sagittal plane error for every 10° increase in tilt and twist ISO. Step 2 demonstrated error reduction utilizing mathematical correction for ISO, resulting in <1° mean peak error and <1.2° mean through-range ROM error regardless of ISO. Accelerometers can be used to measure cardinal plane joint angles, but initial orientation is a source of error unless corrected.

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A Double Differential Torsional Accelerometer With Higher Than 10-kHz Measurement Bandwidth for Vibration Monitoring

et al. 2023

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Measuring Lumbar Motion Angle With a Small Accelerometer: A Reliability Study

Cited by 3 publications

References 27 publications

A Portable and Low-Cost Triboelectric Nanogenerator for Wheelchair Table Tennis Monitoring

A Portable and Low-Cost Triboelectric Nanogenerator for Wheelchair Table Tennis Monitoring

Assessing the Impact of Sensor Orientation on Accelerometer-Derived Angles: A Systematic Analysis and Proposed Error Reduction

A Double Differential Torsional Accelerometer With Higher Than 10-kHz Measurement Bandwidth for Vibration Monitoring

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