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Efficacy of a trunk orthosis with joints providing resistive force on low-back load in elderly persons during static standing.

Katsuhira J, Matsudaira K, Yasui T, Iijima S, Ito A - Clin Interv Aging (2015)

Bottom Line: ES activity significantly decreased while wearing the ORF compared to the other two conditions.Center of pressure did not significantly differ among the conditions.The ORF significantly improved trunk alignment and decreased ES activity in healthy elderly subjects during static standing.

View Article: PubMed Central - PubMed

Affiliation: Department of Nursing and Rehabilitation Science at Odawara, International University of Health and Welfare, Odawara, Kanagawa, Japan.

ABSTRACT

Purpose: Postural alignment of elderly people becomes poor due to aging, possibly leading to low-back pain and spinal deformity. Although there are several interventions for treating these conditions, no previous study has reported the effectiveness of a spinal orthosis or lumbosacral orthosis (LSO) in healthy elderly people without specific spinal deformity. We therefore developed a trunk orthosis to decrease low-back muscle activity while training good postural alignment through resistive force provided by joints with springs (here, called the ORF, which stands for orthosis with joints providing resistive force) as a preventive method against abnormal posture and low-back pain in healthy elderly persons.

Patients and methods: Fifteen community-dwelling elderly men participated in this study. Participants stood freely for 10 seconds in a laboratory setting under three conditions: without an orthosis, with the ORF, and with an LSO. The Damen corset LSO was selected as it is frequently prescribed for patients with low-back pain. Postural alignment during static standing was recorded using a three-dimensional motion capture system employing infrared cameras. Two force plates were used to record center of pressure. Electromyograms were obtained for bilateral erector spinae (ES), left internal abdominal oblique, and right gluteus medius muscles.

Results: Pelvis forward tilt angle tended to increase while wearing the ORF and decrease while wearing the LSO, but these results were not significant compared to no orthosis. Thorax extension angle and thorax angle on pelvis coordinate system significantly increased while wearing the ORF compared to the other two conditions. ES activity significantly decreased while wearing the ORF compared to the other two conditions. Internal oblique activity was significantly smaller while wearing the LSO than with no orthosis. Center of pressure did not significantly differ among the conditions.

Conclusion: The ORF significantly improved trunk alignment and decreased ES activity in healthy elderly subjects during static standing.

No MeSH data available.


Related in: MedlinePlus

Trunk ORF.Notes: (A) Wearing ORF without resistive force on the chest, (B) wearing ORF with resistive force on the chest, (C) detail of link mechanism.Abbreviation: ORF, orthosis with joints providing resistive force.
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f1-cia-10-1413: Trunk ORF.Notes: (A) Wearing ORF without resistive force on the chest, (B) wearing ORF with resistive force on the chest, (C) detail of link mechanism.Abbreviation: ORF, orthosis with joints providing resistive force.

Mentions: In a previous study, to provide a preventive method against abnormal posture and LBP in elderly persons, we designed a trunk orthosis to address these issues by training good postural alignment while decreasing low-back load via resistive force provided by joints with springs (Figure 1).11 This orthosis with joints providing resistive force (hereafter, the ORF) produces a resistive moment that rotates the trunk backward and the pelvis forward (Figure 2). Resistive moment applied to the trunk can not only rotate it backward to shift the center of gravity of the head, arms, and trunk to the L4/L5 joint but also directly decrease low-back extension moment because the resistive moment work is in the same direction as that produced by ES activity. In addition, reaction moment can promote forward rotation of the pelvis, and this effect can also facilitate extension of the thorax. The ORF may therefore improve alignment and decrease ES activity in elderly people. Indeed, our recent studies reported that the ORF improved trunk alignment and gait performance of hemiparetic patients11 and elderly persons during level walking.12 However, we did not examine the effect of the ORF on ES activity and spinal alignment during static standing.


Efficacy of a trunk orthosis with joints providing resistive force on low-back load in elderly persons during static standing.

Katsuhira J, Matsudaira K, Yasui T, Iijima S, Ito A - Clin Interv Aging (2015)

Trunk ORF.Notes: (A) Wearing ORF without resistive force on the chest, (B) wearing ORF with resistive force on the chest, (C) detail of link mechanism.Abbreviation: ORF, orthosis with joints providing resistive force.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4562746&req=5

f1-cia-10-1413: Trunk ORF.Notes: (A) Wearing ORF without resistive force on the chest, (B) wearing ORF with resistive force on the chest, (C) detail of link mechanism.Abbreviation: ORF, orthosis with joints providing resistive force.
Mentions: In a previous study, to provide a preventive method against abnormal posture and LBP in elderly persons, we designed a trunk orthosis to address these issues by training good postural alignment while decreasing low-back load via resistive force provided by joints with springs (Figure 1).11 This orthosis with joints providing resistive force (hereafter, the ORF) produces a resistive moment that rotates the trunk backward and the pelvis forward (Figure 2). Resistive moment applied to the trunk can not only rotate it backward to shift the center of gravity of the head, arms, and trunk to the L4/L5 joint but also directly decrease low-back extension moment because the resistive moment work is in the same direction as that produced by ES activity. In addition, reaction moment can promote forward rotation of the pelvis, and this effect can also facilitate extension of the thorax. The ORF may therefore improve alignment and decrease ES activity in elderly people. Indeed, our recent studies reported that the ORF improved trunk alignment and gait performance of hemiparetic patients11 and elderly persons during level walking.12 However, we did not examine the effect of the ORF on ES activity and spinal alignment during static standing.

Bottom Line: ES activity significantly decreased while wearing the ORF compared to the other two conditions.Center of pressure did not significantly differ among the conditions.The ORF significantly improved trunk alignment and decreased ES activity in healthy elderly subjects during static standing.

View Article: PubMed Central - PubMed

Affiliation: Department of Nursing and Rehabilitation Science at Odawara, International University of Health and Welfare, Odawara, Kanagawa, Japan.

ABSTRACT

Purpose: Postural alignment of elderly people becomes poor due to aging, possibly leading to low-back pain and spinal deformity. Although there are several interventions for treating these conditions, no previous study has reported the effectiveness of a spinal orthosis or lumbosacral orthosis (LSO) in healthy elderly people without specific spinal deformity. We therefore developed a trunk orthosis to decrease low-back muscle activity while training good postural alignment through resistive force provided by joints with springs (here, called the ORF, which stands for orthosis with joints providing resistive force) as a preventive method against abnormal posture and low-back pain in healthy elderly persons.

Patients and methods: Fifteen community-dwelling elderly men participated in this study. Participants stood freely for 10 seconds in a laboratory setting under three conditions: without an orthosis, with the ORF, and with an LSO. The Damen corset LSO was selected as it is frequently prescribed for patients with low-back pain. Postural alignment during static standing was recorded using a three-dimensional motion capture system employing infrared cameras. Two force plates were used to record center of pressure. Electromyograms were obtained for bilateral erector spinae (ES), left internal abdominal oblique, and right gluteus medius muscles.

Results: Pelvis forward tilt angle tended to increase while wearing the ORF and decrease while wearing the LSO, but these results were not significant compared to no orthosis. Thorax extension angle and thorax angle on pelvis coordinate system significantly increased while wearing the ORF compared to the other two conditions. ES activity significantly decreased while wearing the ORF compared to the other two conditions. Internal oblique activity was significantly smaller while wearing the LSO than with no orthosis. Center of pressure did not significantly differ among the conditions.

Conclusion: The ORF significantly improved trunk alignment and decreased ES activity in healthy elderly subjects during static standing.

No MeSH data available.


Related in: MedlinePlus