Validation of seat-off and seat-on in repeated sit-to-stand movements using a single-body-fixed sensor

Abstract

The identification of chair rise phases is a prerequisite for quantifying sitto-stand movements. The aim of this study is to validate seat-off and seaton detection using a single-body-fixed sensor against detection based on chair switches. A single sensor system with three accelerometers and three gyroscopes was fixed around the waist. Synchronized on-off switches were placed under the chair. Thirteen older adults were recruited from a residential care home and fifteen young adults were recruited among college students. Subjects were asked to complete two sets of five trials each. Six features of the trunk movement during seat-off and seat-on were calculated automatically, and a model was developed to predict the moment of seat-off and seat-on transitions. The predictions were validated with leave-one-out cross-validation. Feature extraction failed in two trials (0.7%). For the optimal combination of seat-off predictors, cross-validation yielded a mean error of 0 ms and a mean absolute error of 51 ms. For the best seat-on predictor, cross-validation yielded a mean error of -3 ms and a mean absolute error of 127 ms. The results of this study demonstrate that seat-off and seat-on in repeated sit-to-stand movements can be detected semi-automatically in young and older adults using a one-body-fixed sensor system with an accuracy of 51 and 127 ms, respectively. The use of the ambulatory instrumentation is feasible for non-technically trained personnel. This is an important step in the development of an automated method for the quantification of sit-to-stand movements in clinical practice.

An evaluation of the 30-s chair stand test in older adults: frailty detection based on kinematic parameters from a single inertial unit

“…Other studies define consecutive sit-stand-sit cycles by a double flexion and extension movement [26,39,40]. Our research showed that this specific movement does not always occur, the X-orientation range we found during the impulse phase revealed that healthy subjects do not perform double flexion and extension.…”

“…In the literature, only Van Lummel et al, [36] differentiate between correct SitTS movements and failed attempts. They employed the velocity information instead of the position, but they did not provide any further information about their methodology.…”

Wearable inertial sensors for human movement analysis

“…Reliability of instrumented STS has been assessed against conventional movement analysis systems [103,104], whereas its sensitivity has been proved by comparing young and older adults [105,106]. For example, Regterschot and colleagues reported ICC≥0.90 and standard error of the measurement ≤9.9% [105].…”

The validity of assessing temporal events, sub-phases and trunk kinematics of the sit-to-walk movement in older adults using a single inertial sensor

“…A single IS, worn on the lower back, has successfully been used for analyzing sub-phases and trunk kinematics during chair rise (Giansanti and Maccioni, 2006;Millor et al, 2013;Schwenk et al, 2012;Van Lummel et al, 2012;Van Lummel et al, 2013;Weiss et al, 2011Weiss et al, , 2010 and have been validated against other instrumentation for the sit-to-stand task (Boonstra et al, 2006;Janssen et al, 2008;Zijlstra et al, 2012). But Contents lists available at ScienceDirect journal homepage: www.elsevier.com/locate/jbiomech www.JBiomech.com the validity of using an IS during the biomechanically challenging sit-to-walk (STW) task, which is common in daily life, has not yet been investigated (Kouta and Shinkoda, 2008).…”