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Trunk muscle activity and acceleration of the spine during partial-body vibration in a sitting position—a single case study
WCPT Congress 2015 / Physiotherapy 2015; Volume 101, Supplement 1 eS26–eS426
Research Report Poster Presentation Number: RR-PO-04-24-Sun Sunday 3 May 2015 13:00 Exhibit halls 401–403 TRUNK MUSCLE ACTIVITY AND ACCELERATION OF THE SPINE DURING PARTIAL-BODY VIBRATION IN A SITTING POSITION—A SINGLE CASE STUDY P. Eichelberger, R. Fankhauser, R. Geering, L. Radlinger, S. Rogan Bern University of Applied Sciences, Health, Discipline Physiotherapy, Bern, Switzerland Background: Whole-body vibration (WBV) is established in rehabilitation, in physiotherapy and in sports. WBV may potentially stimulate sensorimotor processes. Recent reviews revealed positive effects on muscle force, postural control, pelvic floor, bone density and musculoskeletal complaints. On this account WBV might be important in deconditioned persons such as frailty, patients with musculoskeletal complaints or after stroke, Parkinson‘s disease or multiple sclerosis for skilling up. The research focuses on the use of WBV, which is carried out in standing position. But only a few studies examined partial-body vibration (PBV) in sitting position. For this reason a PBV device has been developed for sitting. Purpose: The aim of this single case study was to evaluate trunk muscle activity and acceleration propagation in sitting position during PBV with different vibration parameters. Methods: A vibrating plate with three rotational degrees of freedom was used which lets the operator to choose a rotation axis, amplitude (◦ ), frequency (Hz) and the underlying sinusoidal or stochastic nature of the oscillation. Sinusoidal (S-PBV) and stochastic (ST-PBV) with amplitudes from 0.1◦ to 1◦ and frequencies from 1 Hz to 12 Hz were applied in anterior-posterior and medial-lateral direction. Muscle activity (EMG) and acceleration propagation (3-axis accelerometers) during PBV in sitting position in a 26-yearold healthy male were examined. EMG was measured for M. erector spinae (ES, left, height L4), M. obliqus externus abdominis (OE, left), M. trapezius ascendens (TA, left) and M. trapezius descendens (TD, left). Acceleration was captured on the vibrating plate, on the spinal processes of L4 and C7 and on top of the cranium in medial-lateral (ML), in anterior-posterior (AP) and in cranial-caudal (CC) direction. EMG data during vibration was normalized against the activity during maximum voluntary contraction (MVC). Results: AP and ML accelerations were highest on the vibrating plate and continuously degreased up to the cranium. CC accelerations were low on all levels. The highest mean acceleration on the body was observed at L4 during ST-WBV with 18.9 m/s2 . In general, ST-PBV resulted in higher mean accelerations but had smaller peak accelerations compared to S-PBV. The ES showed the highest relative mean activations
eS347
with 2.9–7.3% MVC. AP and ML oscillations determined a slightly higher ES-activation during ST-PBV compared to S-PBV. Conclusion(s): Decreasing accelerations were observed with increasing distance from the vibrating plate due to damping properties of involved body structures. Higher activation of muscles closer to the vibrating plate was found. The decrease in muscle activation was related with a decrease of acceleration (body motion), what is plausible from a biomechanical point of view. Erector spinae muscles seem to invoke higher muscle activation during ST-PBV compared to S-PBV. This effect is similar to recent findings from other authors. We account this to the higher mean accelerations resulting from ST-PBV, in fact higher loads to which the body has to respond. Implications: ST-PBV should be preferred in practice because of two reasons. Firstly, higher mean accelerations can be reached with lower peak accelerations (shocks) and secondly, the resulting muscle activation seems to be higher compared to S-PBV. Keywords: Sinusoidal vibration; Stochastic vibration; Muscle activation Funding acknowledgements: None. Ethics approval: None, because single case studies do not need an Ethic approval in Switzerland. http://dx.doi.org/10.1016/j.physio.2015.03.556 Special Interest Report Poster Presentation Number: SI-PO-05-11-Sun Sunday 3 May 2015 12:15 Exhibit halls 401–403 THE CONTRIBUTION OF NON-GOVERNMENTAL ORGANIZATIONS IN PUBLIC HEALTH WORK AND WHY PHYSIOTHERAPISTS PLAY A KEY ROLE M. Ekeland Oslo and Akershus University College, Department of Physiotherapy, Oslo, Norway Background: Inactivity is a world-wide health problem. Municipalities and local governments have an important responsibility in public health work, and the cooperation with non-governmental organizations (NGOs) is an important factor in this work. Schools, child health centers and child welfare services are public institutions. One aim is to contribute to self-esteem and a healthy life. Volunteer organizations also want to contribute to the well-being of children. There is a difference between governmental responsibility and the contribution from NGOs, but knowledge about how to activate inactive children and adolescents are important for both parts. Purpose: How can we develop this partnership between NGOs and public sector in promoting health, and can physiotherapist play a role?
Research Report Poster Presentation Number: RR-PO-04-24-Sun Sunday 3 May 2015 13:00 Exhibit halls 401–403 TRUNK MUSCLE ACTIVITY AND ACCELERATION OF THE SPINE DURING PARTIAL-BODY VIBRATION IN A SITTING POSITION—A SINGLE CASE STUDY P. Eichelberger, R. Fankhauser, R. Geering, L. Radlinger, S. Rogan Bern University of Applied Sciences, Health, Discipline Physiotherapy, Bern, Switzerland Background: Whole-body vibration (WBV) is established in rehabilitation, in physiotherapy and in sports. WBV may potentially stimulate sensorimotor processes. Recent reviews revealed positive effects on muscle force, postural control, pelvic floor, bone density and musculoskeletal complaints. On this account WBV might be important in deconditioned persons such as frailty, patients with musculoskeletal complaints or after stroke, Parkinson‘s disease or multiple sclerosis for skilling up. The research focuses on the use of WBV, which is carried out in standing position. But only a few studies examined partial-body vibration (PBV) in sitting position. For this reason a PBV device has been developed for sitting. Purpose: The aim of this single case study was to evaluate trunk muscle activity and acceleration propagation in sitting position during PBV with different vibration parameters. Methods: A vibrating plate with three rotational degrees of freedom was used which lets the operator to choose a rotation axis, amplitude (◦ ), frequency (Hz) and the underlying sinusoidal or stochastic nature of the oscillation. Sinusoidal (S-PBV) and stochastic (ST-PBV) with amplitudes from 0.1◦ to 1◦ and frequencies from 1 Hz to 12 Hz were applied in anterior-posterior and medial-lateral direction. Muscle activity (EMG) and acceleration propagation (3-axis accelerometers) during PBV in sitting position in a 26-yearold healthy male were examined. EMG was measured for M. erector spinae (ES, left, height L4), M. obliqus externus abdominis (OE, left), M. trapezius ascendens (TA, left) and M. trapezius descendens (TD, left). Acceleration was captured on the vibrating plate, on the spinal processes of L4 and C7 and on top of the cranium in medial-lateral (ML), in anterior-posterior (AP) and in cranial-caudal (CC) direction. EMG data during vibration was normalized against the activity during maximum voluntary contraction (MVC). Results: AP and ML accelerations were highest on the vibrating plate and continuously degreased up to the cranium. CC accelerations were low on all levels. The highest mean acceleration on the body was observed at L4 during ST-WBV with 18.9 m/s2 . In general, ST-PBV resulted in higher mean accelerations but had smaller peak accelerations compared to S-PBV. The ES showed the highest relative mean activations
eS347
with 2.9–7.3% MVC. AP and ML oscillations determined a slightly higher ES-activation during ST-PBV compared to S-PBV. Conclusion(s): Decreasing accelerations were observed with increasing distance from the vibrating plate due to damping properties of involved body structures. Higher activation of muscles closer to the vibrating plate was found. The decrease in muscle activation was related with a decrease of acceleration (body motion), what is plausible from a biomechanical point of view. Erector spinae muscles seem to invoke higher muscle activation during ST-PBV compared to S-PBV. This effect is similar to recent findings from other authors. We account this to the higher mean accelerations resulting from ST-PBV, in fact higher loads to which the body has to respond. Implications: ST-PBV should be preferred in practice because of two reasons. Firstly, higher mean accelerations can be reached with lower peak accelerations (shocks) and secondly, the resulting muscle activation seems to be higher compared to S-PBV. Keywords: Sinusoidal vibration; Stochastic vibration; Muscle activation Funding acknowledgements: None. Ethics approval: None, because single case studies do not need an Ethic approval in Switzerland. http://dx.doi.org/10.1016/j.physio.2015.03.556 Special Interest Report Poster Presentation Number: SI-PO-05-11-Sun Sunday 3 May 2015 12:15 Exhibit halls 401–403 THE CONTRIBUTION OF NON-GOVERNMENTAL ORGANIZATIONS IN PUBLIC HEALTH WORK AND WHY PHYSIOTHERAPISTS PLAY A KEY ROLE M. Ekeland Oslo and Akershus University College, Department of Physiotherapy, Oslo, Norway Background: Inactivity is a world-wide health problem. Municipalities and local governments have an important responsibility in public health work, and the cooperation with non-governmental organizations (NGOs) is an important factor in this work. Schools, child health centers and child welfare services are public institutions. One aim is to contribute to self-esteem and a healthy life. Volunteer organizations also want to contribute to the well-being of children. There is a difference between governmental responsibility and the contribution from NGOs, but knowledge about how to activate inactive children and adolescents are important for both parts. Purpose: How can we develop this partnership between NGOs and public sector in promoting health, and can physiotherapist play a role?