The effects of backrest thickness on the shoulder muscle load during wheelchair propulsion

[Purpose] This study investigated the optimal thickness of the wheelchair backrest for lumbar load and increased comfort. [Subjects] Fifteen healthy people participated. [Methods] The study examined three randomized backrest conditions: no pad; a 3-cm-thick lumbar pad; and a 6-cm-thick lumbar pad. T...

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Published inJournal of Physical Therapy Science Vol. 27; no. 6; pp. 1767 - 1769
Main Author Yoo, Ingyu
Format Journal Article
LanguageEnglish
Published Japan The Society of Physical Therapy Science 2015
Subjects
Online AccessGet full text
ISSN0915-5287
2187-5626
DOI10.1589/jpts.27.1767

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Abstract [Purpose] This study investigated the optimal thickness of the wheelchair backrest for lumbar load and increased comfort. [Subjects] Fifteen healthy people participated. [Methods] The study examined three randomized backrest conditions: no pad; a 3-cm-thick lumbar pad; and a 6-cm-thick lumbar pad. The location of the lumbar pad was standardized at the mid-lumbar level (L3). Participants were instructed to propel the wheelchair using only the handrims. [Results] Activation of the anterior deltoid, upper trapezius, and biceps brachii muscles was significantly reduced when the participants used the 3-cm pad compared to no pad, while it was significantly increased in the anterior deltoid, upper trapezius, posterior deltoid, and biceps brachii when the participants used the 6-cm pad compared to the 3-cm pad. Muscle activation did not differ significantly between the no pad and the 6-cm lumbar pad conditions. [Conclusion] A lumbar pad decreased the activation of the upper extremity muscles. We believe that padding of the appropriate thickness will lead to effective muscle activation while propelling a wheelchair and decrease the risk of musculoskeletal disease.
AbstractList [Abstract.] [Purpose] This study investigated the optimal thickness of the wheelchair backrest for lumbar load and increased comfort. [Subjects] Fifteen healthy people participated. [Methods] The study examined three randomized backrest conditions: no pad; a 3-cm-thick lumbar pad; and a 6-cm-thick lumbar pad. The location of the lumbar pad was standardized at the mid-lumbar level (L3). Participants were instructed to propel the wheelchair using only the handrims. [Results] Activation of the anterior deltoid, upper trapezius, and biceps brachii muscles was significantly reduced when the participants used the 3-cm pad compared to no pad, while it was significantly increased in the anterior deltoid, upper trapezius, posterior deltoid, and biceps brachii when the participants used the 6-cm pad compared to the 3-cm pad. Muscle activation did not differ significantly between the no pad and the 6-cm lumbar pad conditions. [Conclusion] A lumbar pad decreased the activation of the upper extremity muscles. We believe that padding of the appropriate thickness will lead to effective muscle activation while propelling a wheelchair and decrease the risk of musculoskeletal disease.
[Purpose] This study investigated the optimal thickness of the wheelchair backrest for lumbar load and increased comfort. [Subjects] Fifteen healthy people participated. [Methods] The study examined three randomized backrest conditions: no pad; a 3-cm-thick lumbar pad; and a 6-cm-thick lumbar pad. The location of the lumbar pad was standardized at the mid-lumbar level (L3). Participants were instructed to propel the wheelchair using only the handrims. [Results] Activation of the anterior deltoid, upper trapezius, and biceps brachii muscles was significantly reduced when the participants used the 3-cm pad compared to no pad, while it was significantly increased in the anterior deltoid, upper trapezius, posterior deltoid, and biceps brachii when the participants used the 6-cm pad compared to the 3-cm pad. Muscle activation did not differ significantly between the no pad and the 6-cm lumbar pad conditions. [Conclusion] A lumbar pad decreased the activation of the upper extremity muscles. We believe that padding of the appropriate thickness will lead to effective muscle activation while propelling a wheelchair and decrease the risk of musculoskeletal disease.
[Purpose] This study investigated the optimal thickness of the wheelchair backrest for lumbar load and increased comfort. [Subjects] Fifteen healthy people participated. [Methods] The study examined three randomized backrest conditions: no pad; a 3-cm-thick lumbar pad; and a 6-cm-thick lumbar pad. The location of the lumbar pad was standardized at the mid-lumbar level (L3). Participants were instructed to propel the wheelchair using only the handrims. [Results] Activation of the anterior deltoid, upper trapezius, and biceps brachii muscles was significantly reduced when the participants used the 3-cm pad compared to no pad, while it was significantly increased in the anterior deltoid, upper trapezius, posterior deltoid, and biceps brachii when the participants used the 6-cm pad compared to the 3-cm pad. Muscle activation did not differ significantly between the no pad and the 6-cm lumbar pad conditions. [Conclusion] A lumbar pad decreased the activation of the upper extremity muscles. We believe that padding of the appropriate thickness will lead to effective muscle activation while propelling a wheelchair and decrease the risk of musculoskeletal disease.
Purpose: This study investigated the optimal thickness of the wheelchair backrest for lumbar load and increased comfort. Subjects: Fifteen healthy people participated. Methods: The study examined three randomized backrest conditions: no pad; a 3-cm-thick lumbar pad; and a 6-cm-thick lumbar pad. The location of the lumbar pad was standardized at the mid-lumbar level (L3). Participants were instructed to propel the wheelchair using only the handrims. Results: Activation of the anterior deltoid, upper trapezius, and biceps brachii muscles was significantly reduced when the participants used the 3-cm pad compared to no pad, while it was significantly increased in the anterior deltoid, upper trapezius, posterior deltoid, and biceps brachii when the participants used the 6-cm pad compared to the 3-cm pad. Muscle activation did not differ significantly between the no pad and the 6-cm lumbar pad conditions. Conclusion: A lumbar pad decreased the activation of the upper extremity muscles. We believe that padding of the appropriate thickness will lead to effective muscle activation while propelling a wheelchair and decrease the risk of musculoskeletal disease.
Author Yoo, Ingyu
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Cites_doi 10.1016/j.clinbiomech.2006.04.010
10.1589/jpts.24.495
10.1682/JRRD.2003.01.0008
10.1109/TNSRE.2013.2266136
10.1097/01.BRS.0000068243.63203.A8
10.1016/j.apmr.2003.08.090
10.1038/sc.2008.72
10.1016/S1350-4533(01)00083-2
10.2106/JBJS.H.01373
10.1016/j.apergo.2006.11.001
10.1589/jpts.24.51
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References 2) Kotajarvi BR, Sabick MB, An KN, et al.: The effect of seat position on wheelchair propulsion biomechanics. J Rehabil Res Dev, 2004, 41: 403–414.
10) van der Woude LH, Veeger HE, Dallmeijer AJ, et al.: Biomechanics and physiology in active manual wheelchair propulsion. Med Eng Phys, 2001, 23: 713–733.
4) Qi L, Wakeling J, Grange S, et al.: Patterns of shoulder muscle coordination vary between wheelchair propulsion techniques. IEEE Trans Neural Syst Rehabil Eng, 2014, 22: 559–566.
9) Chaffin DB, Andersson GB, Martin BJ: Occupational Biomechanics, 4th ed. New York: John Wiley and Sons, 2006.
5) Makhsous M, Lin F, Hendrix RW, et al.: Sitting with adjustable ischial and back supports: biomechanical changes. Spine, 2003, 28: 1113–1121, discussion 1121–1122.
11) Mulroy SJ, Farrokhi S, Newsam CJ, et al.: Effects of spinal cord injury level on the activity of shoulder muscles during wheelchair propulsion: an electromyographic study. Arch Phys Med Rehabil, 2004, 85: 925–934.
8) Akbar M, Balean G, Brunner M, et al.: Prevalence of rotator cuff tear in paraplegic patients compared with controls. J Bone Joint Surg Am, 2010, 92: 23–30.
1) Mercer JL, Boninger M, Koontz A, et al.: Shoulder joint kinetics and pathology in manual wheelchair users. Clin Biomech (Bristol, Avon), 2006, 21: 781–789.
7) Huang YD, Wang S, Wang T, et al.: Effects of backrest density on lumbar load and comfort during seated work. Chin Med J (Engl), 2012, 125: 3505–3508.
12) Lee SY, Kim SC, Lee MH: Effect of wheelchair seat height on shoulder and forearm muscle activities during wheelchair propulsion on a ramp. J Phys Ther Sci, 2012, 24: 495–497.
13) Lee SY, Kim SC, Lee MH, et al.: Effect of the height of a wheelchair on the shoulder and forearm muscular activation during wheelchair propulsion. J Phys Ther Sci, 2012, 24: 51–53.
3) Yang YS, Chang GL, Hsu MJ, et al.: Remote monitoring of sitting behaviors for community-dwelling manual wheelchair users with spinal cord injury. Spinal Cord, 2009, 47: 67–71.
6) Carcone SM, Keir PJ: Effects of backrest design on biomechanics and comfort during seated work. Appl Ergon, 2007, 38: 755–764.
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17275776 - Appl Ergon. 2007 Nov;38(6):755-64
12782977 - Spine (Phila Pa 1976). 2003 Jun 1;28(11):1113-21; discussion 1121-2
23044314 - Chin Med J (Engl). 2012 Oct;125(19):3505-8
23797282 - IEEE Trans Neural Syst Rehabil Eng. 2014 May;22(3):559-66
16808992 - Clin Biomech (Bristol, Avon). 2006 Oct;21(8):781-9
15543458 - J Rehabil Res Dev. 2004 May;41(3B):403-14
18560373 - Spinal Cord. 2009 Jan;47(1):67-71
20048092 - J Bone Joint Surg Am. 2010 Jan;92 (1):23-30
11801413 - Med Eng Phys. 2001 Dec;23(10):713-33
15179646 - Arch Phys Med Rehabil. 2004 Jun;85(6):925-34
References_xml – reference: 9) Chaffin DB, Andersson GB, Martin BJ: Occupational Biomechanics, 4th ed. New York: John Wiley and Sons, 2006.
– reference: 5) Makhsous M, Lin F, Hendrix RW, et al.: Sitting with adjustable ischial and back supports: biomechanical changes. Spine, 2003, 28: 1113–1121, discussion 1121–1122.
– reference: 12) Lee SY, Kim SC, Lee MH: Effect of wheelchair seat height on shoulder and forearm muscle activities during wheelchair propulsion on a ramp. J Phys Ther Sci, 2012, 24: 495–497.
– reference: 3) Yang YS, Chang GL, Hsu MJ, et al.: Remote monitoring of sitting behaviors for community-dwelling manual wheelchair users with spinal cord injury. Spinal Cord, 2009, 47: 67–71.
– reference: 2) Kotajarvi BR, Sabick MB, An KN, et al.: The effect of seat position on wheelchair propulsion biomechanics. J Rehabil Res Dev, 2004, 41: 403–414.
– reference: 10) van der Woude LH, Veeger HE, Dallmeijer AJ, et al.: Biomechanics and physiology in active manual wheelchair propulsion. Med Eng Phys, 2001, 23: 713–733.
– reference: 13) Lee SY, Kim SC, Lee MH, et al.: Effect of the height of a wheelchair on the shoulder and forearm muscular activation during wheelchair propulsion. J Phys Ther Sci, 2012, 24: 51–53.
– reference: 8) Akbar M, Balean G, Brunner M, et al.: Prevalence of rotator cuff tear in paraplegic patients compared with controls. J Bone Joint Surg Am, 2010, 92: 23–30.
– reference: 11) Mulroy SJ, Farrokhi S, Newsam CJ, et al.: Effects of spinal cord injury level on the activity of shoulder muscles during wheelchair propulsion: an electromyographic study. Arch Phys Med Rehabil, 2004, 85: 925–934.
– reference: 4) Qi L, Wakeling J, Grange S, et al.: Patterns of shoulder muscle coordination vary between wheelchair propulsion techniques. IEEE Trans Neural Syst Rehabil Eng, 2014, 22: 559–566.
– reference: 1) Mercer JL, Boninger M, Koontz A, et al.: Shoulder joint kinetics and pathology in manual wheelchair users. Clin Biomech (Bristol, Avon), 2006, 21: 781–789.
– reference: 7) Huang YD, Wang S, Wang T, et al.: Effects of backrest density on lumbar load and comfort during seated work. Chin Med J (Engl), 2012, 125: 3505–3508.
– reference: 6) Carcone SM, Keir PJ: Effects of backrest design on biomechanics and comfort during seated work. Appl Ergon, 2007, 38: 755–764.
– ident: 1
  doi: 10.1016/j.clinbiomech.2006.04.010
– ident: 12
  doi: 10.1589/jpts.24.495
– ident: 2
  doi: 10.1682/JRRD.2003.01.0008
– ident: 4
  doi: 10.1109/TNSRE.2013.2266136
– ident: 5
  doi: 10.1097/01.BRS.0000068243.63203.A8
– ident: 11
  doi: 10.1016/j.apmr.2003.08.090
– ident: 9
– volume: 47
  start-page: 67
  issn: 1362-4393
  year: 2009
  ident: 3
  publication-title: Spinal Cord
  doi: 10.1038/sc.2008.72
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  doi: 10.1016/S1350-4533(01)00083-2
– ident: 8
  doi: 10.2106/JBJS.H.01373
– ident: 6
  doi: 10.1016/j.apergo.2006.11.001
– ident: 13
  doi: 10.1589/jpts.24.51
– reference: 23044314 - Chin Med J (Engl). 2012 Oct;125(19):3505-8
– reference: 11801413 - Med Eng Phys. 2001 Dec;23(10):713-33
– reference: 17275776 - Appl Ergon. 2007 Nov;38(6):755-64
– reference: 16808992 - Clin Biomech (Bristol, Avon). 2006 Oct;21(8):781-9
– reference: 23797282 - IEEE Trans Neural Syst Rehabil Eng. 2014 May;22(3):559-66
– reference: 20048092 - J Bone Joint Surg Am. 2010 Jan;92 (1):23-30
– reference: 15179646 - Arch Phys Med Rehabil. 2004 Jun;85(6):925-34
– reference: 18560373 - Spinal Cord. 2009 Jan;47(1):67-71
– reference: 12782977 - Spine (Phila Pa 1976). 2003 Jun 1;28(11):1113-21; discussion 1121-2
– reference: 15543458 - J Rehabil Res Dev. 2004 May;41(3B):403-14
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Snippet [Purpose] This study investigated the optimal thickness of the wheelchair backrest for lumbar load and increased comfort. [Subjects] Fifteen healthy people...
[Abstract.] [Purpose] This study investigated the optimal thickness of the wheelchair backrest for lumbar load and increased comfort. [Subjects] Fifteen...
Purpose: This study investigated the optimal thickness of the wheelchair backrest for lumbar load and increased comfort. Subjects: Fifteen healthy people...
[Purpose] This study investigated the optimal thickness of the wheelchair backrest for lumbar load and increased comfort. [Subjects] Fifteen healthy people...
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SubjectTerms Electromyography
Lumbar pad
Original
Wheelchair
Title The effects of backrest thickness on the shoulder muscle load during wheelchair propulsion
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