Criterion validity and between-day reliability of an inertial-sensor-based trunk postural stability test during unstable sitting

Concurrent validity and reliability of a novel wireless inertial measurement system to assess trunk movement

“…This study has focused on pain-free participants. Although reliability is affected by the heterogeneity of study populations (Lariviere et al, 2013), the inclusion of pain-free participants was reasonable to evaluate the usability of an IMU system to measure trunk kinematics.…”

Reliability of assessing postural control during seated balancing using a physical human-robot interaction

“…Other seated balance set-ups have the ability to regulate test difficulty by changing the radius of the hemisphere (Cholewicki et al, 2000; Radebold et al, 2001; Reeves et al, 2008; van Dieën et al, 2010b) or by changing the position of the springs used to provide rotational stiffness (Larivière et al, 2015, 2013; Lee and Granata, 2008; Oomen et al, 2015). This adjustment, however, often requires the subject to be removed from the seat, and in the case of the hemisphere, has less resolution in changing the test difficulty.…”

“…The last three (full) trials were used for analysis in this study. According to Larivière et al (2013), three trials provided acceptable reliability.…”

“…Three studies addressed the reliability of seated balance tests, and the reported results range from poor to excellent (Cholewicki et al, 2000; Larivière et al, 2013; van Dieën et al, 2010b). These inconsistencies could stem from the fact that unperturbed postural sway was used as a measure of performance.…”

Less precise motor control leads to increased agonist-antagonist muscle activation during stick balancing

“…The angular position was then used to calculate the average angular velocity of the stick x, by calculating the total angular path traveled during the trial divided by the duration of the trial (20 s). The use of average angular velocity was chosen given its established reliability in assessing human motor control (Cholewicki, Polzhofer, & Radebold, 2000;Lariviere, Mecheri, Shahvarpour, Gagnon, & Shirazi-Adl, 2013). To allow for comparisons with the previous stick balancing experiment the average angular velocity was converted into frequency using f = x/2p.…”