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Roynarin N, Channak S, Janwantanakul P. Postural shifts and body perceived discomfort during 1-hour sitting when leaning and sitting on an air-filled seat cushion among healthy office workers. ERGONOMICS 2024:1-12. [PMID: 38932623 DOI: 10.1080/00140139.2024.2372006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2024] [Accepted: 06/18/2024] [Indexed: 06/28/2024]
Abstract
This study compared the number of postural shifts and perceived discomfort while leaning and sitting on an air-filled seat cushion for 1 hour. Sixty office workers typed a standard text while leaning on a cushion placed behind the low back, sitting on a cushion placed under the buttocks, and sitting without a cushion (a control condition). The number of postural shifts was collected using a seat pressure mat device. Low back discomfort was assessed using the Borg CR-10 scale. Leaning on a seat cushion (22 shifts/h) led to a significantly higher number of postural shifts than sitting on a seat cushion (18 shifts/h) and the control condition (20 shifts/h). Leaning or sitting on a seat cushion significantly decreased low back discomfort compared to the control condition (p < 0.05). Leaning on a seat cushion placed behind the low back may be an effective means of preventing low back pain among office workers.
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Affiliation(s)
- Narumon Roynarin
- Department of Physical Therapy, Faculty of Allied Health Sciences, Chulalongkorn University, Bangkok, Thailand
| | - Sirinant Channak
- Faculty of Physical Therapy, Huachiew Chalermprakiet University, Samutprakarn, Thailand
| | - Prawit Janwantanakul
- Department of Physical Therapy, Faculty of Allied Health Sciences, Chulalongkorn University, Bangkok, Thailand
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Ukita A, Abe M, Kishigami H, Hatta T. Influence of back support shape in wheelchairs offering pelvic support on asymmetrical sitting posture and pressure points during reaching tasks in stroke patients. PLoS One 2020; 15:e0231860. [PMID: 32315353 PMCID: PMC7173851 DOI: 10.1371/journal.pone.0231860] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Accepted: 04/02/2020] [Indexed: 12/25/2022] Open
Abstract
Many poststroke hemiplegic patients have an asymmetrical wheelchair-sitting posture. This study aimed to investigate the impact of different back support shapes on asymmetrical sitting posture and pressure points among poststroke hemiplegic patients during an activities of daily living–related reaching task. This study included 23 poststroke hemiplegic patients who performed tasks that involved the movement of objects using the unaffected upper limb to the affected side while sitting in a conventional wheelchair (C-WC) with a flat back support or a wheelchair providing pelvic and thoracic support (P-WC). Body alignment angles from video images and pressure distribution on supporting surfaces were measured using a two-dimensional motion analysis software (Dartfish) and a pressure mapping system (FSA). Regarding movement performance, although postural asymmetry increased in both wheelchair types, the degree of postural variation was smaller with P-WC use than C-WC use (p < 0.05), with partly reduced postural asymmetry. With P-WC, one-sided ischial asymmetrical pressure was significantly less after the movement (p < 0.05). In conclusion, P-WC’s back support shape contributed to a decrease in postural asymmetry for pelvic girdle support both at rest and during movement. This highlights the importance of a wheelchair back support shape and may help to increase the quality of activities of daily living movement in poststroke hemiplegic patients in wheelchairs.
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Affiliation(s)
- Atsuki Ukita
- Social Medical Corporation Hokuto, Tokachi Rehabilitation Center, Obihiro, Japan
- Tohoku Fukushi University, Sendai, Japan
| | - Masayuki Abe
- Social Medical Corporation Hokuto, Tokachi Rehabilitation Center, Obihiro, Japan
| | | | - Tatsuo Hatta
- Japan Health Care College, Eniwa, Japan
- * E-mail:
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Nam HS, Han M, Choi HY, Song K, Kang S, Ahn SM, Lee SU. Effect of reclining angle on lumbar lordosis at driving posture: A radiological evaluation. J Back Musculoskelet Rehabil 2019; 31:923-930. [PMID: 29945341 DOI: 10.3233/bmr-170875] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
BACKGROUND Optimal seatback angles for automobile drivers' seats have been investigated based on comfort and back muscle activities; however, radiology supported evidences are scarce. OBJECTIVE The aim of this study was to evaluate optimal range of the seatback reclining regarding torso angles for an automobile driver's seat to preserve lumbar lordosis. METHODS Thirty-one healthy volunteers were recruited among five body type categories. Lateral lumbar spine X-rays were obtained for the neutral sitting posture without seatback (reference), and with reclining angles of 23∘ to 33∘ by 2∘ intervals. The Cobb angles for the L1-L4, L4-S1, and L1-S1 segments were measured. RESULTS The Cobb angle for L4-S1 was nearest to the reference (18.74 ± 1.57∘, mean ± standard error mean) at reclining angles of 29∘ and 31∘ (14.51 ± 1.41∘ and 14.47 ± 1.43∘, respectively). The Cobb angle at L4-S1 between reclining angles of 27∘(12.02 ± 1.31∘) and 29∘ (14.51 ± 1.41∘) were significantly different (p< 0.001). Tall men showed relatively preserved lordosis angles at all reclining angles. Fat men and short women demonstrated prominent loss of lordosis with excessively kyphotic L1-L4 segment. CONCLUSIONS Reclining angles of 29∘ to 31∘ revealed to be optimal for preserving lordosis at the L4-S1 segment. Individualized healthcare-related guideline for driver's seat adjustment setting is necessary.
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Affiliation(s)
- Hyung Seok Nam
- Department of Biomedical Engineering, Seoul National University College of Medicine, Seoul, Korea.,Department of Rehabilitation Medicine, Seoul National University Boramae Medical Center, Seoul, Korea.,Department of Rehabilitation Medicine, Seoul National University College of Medicine, Seoul, Korea
| | - Manyong Han
- Department of Mechanical and System Design Engineering, Hongik University, Seoul, Korea
| | - Hyung Yun Choi
- Department of Mechanical and System Design Engineering, Hongik University, Seoul, Korea
| | - Kyuman Song
- School of Architecture, Hongik University, Seoul, Korea
| | - Seonggyu Kang
- Hyundai Motors Namyang R&D Division, Hwaseong-si, Korea
| | - Sung Min Ahn
- Hyundai Motors Namyang R&D Division, Hwaseong-si, Korea
| | - Shi-Uk Lee
- Department of Rehabilitation Medicine, Seoul National University Boramae Medical Center, Seoul, Korea.,Department of Rehabilitation Medicine, Seoul National University College of Medicine, Seoul, Korea
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Li CT, Chen YN, Tseng YT, Tsai KH. Biomechanical analysis of different dynamic sitting techniques: an exploratory study. Biomed Eng Online 2019; 18:4. [PMID: 30606212 PMCID: PMC6318992 DOI: 10.1186/s12938-018-0621-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2017] [Accepted: 12/20/2018] [Indexed: 11/10/2022] Open
Abstract
Prolonged static sitting in wheelchairs increases the risk of pressure ulcers. This exploratory study proposed three dynamic sitting techniques in order to reduce the risk of developing pressure ulcer during wheelchair sitting, namely lumbar prominent dynamic sitting, femur upward dynamic sitting, and lumbar prominent with femur upward dynamic sitting. The purpose of this study was to analyze the biomechanical effects of these three techniques on interface pressure. 15 able-bodied people were recruited as subjects to compare the aforementioned sitting techniques in a random order. All parameters, including dynamic contact area, dynamic average pressure, and dynamic peak pressure on backrest and seat were measured and compared. In result, when compared with lumbar prominent dynamic sitting, femur upward dynamic sitting and lumbar prominent with femur upward dynamic sitting appeared to yield significantly lower dynamic average and peak pressure on the back part of seat, and significantly higher dynamic average and peak pressure on the front part of seat. This study can serve as a reference point for clinical physicians or wheelchair users to identify a suitable dynamic sitting technique.
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Affiliation(s)
- Chun-Ting Li
- Graduate Institute of Mechatronic System Engineering, National University of Tainan, No. 33, Sec. 2, Shu-Lin St., West Central Dist., Tainan, 70005, Taiwan
| | - Yen-Nien Chen
- Department of BioMedical Engineering, National Cheng Kung University, No.1, University Rd., East Dist., Tainan, 70101, Taiwan. .,Department of Orthopedics, Show-Chwan Memorial Hospital, No. 542, Sec. 1, Chung-Shan Rd., Changhua, 50008, Taiwan.
| | - Yen-Ting Tseng
- Graduate Institute of Mechatronic System Engineering, National University of Tainan, No. 33, Sec. 2, Shu-Lin St., West Central Dist., Tainan, 70005, Taiwan
| | - Kuen-Horng Tsai
- Graduate Institute of Mechatronic System Engineering, National University of Tainan, No. 33, Sec. 2, Shu-Lin St., West Central Dist., Tainan, 70005, Taiwan.
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Li CT, Huang KY, Kung CF, Chen YN, Tseng YT, Tsai KH. Evaluation of the effect of different sitting assistive devices in reclining wheelchair on interface pressure. Biomed Eng Online 2017; 16:108. [PMID: 28851369 PMCID: PMC5576165 DOI: 10.1186/s12938-017-0398-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2017] [Accepted: 08/21/2017] [Indexed: 01/27/2023] Open
Abstract
Background Reclining wheelchair users often add one or more sitting assistive devices to their wheelchairs, but the effect of these additional sitting assistive devices on the risk of pressure ulcers has rarely been investigated. This study examined the four modes of reclining wheelchair without and with different sitting assistive devices, namely the back reclined mode, the lumbar support with back reclined mode, the femur upward with back reclined mode, and the lumbar support with femur upward with back reclined mode, in terms of their effects on human-wheelchair interface pressure. Methods This study recruited 16 healthy participants to undergo the aforementioned four modes in random order and have their human-wheelchair interface pressure measured. The initial setting of experimental reclining wheelchair backrest was pushed backward to reach a 150° recline. The data on interface pressure were collected for 5 s while the participant maintained a stable sitting position. The contact area, average pressure, and peak pressure on the back area, ischial area, and femur area were recorded and calculated. Results Among all tested modes, the lumbar support with femur upward with back reclined mode provided the most significant reduction in stress load on the ischial area (P ≤ 0.010) and shifted part of the load to the femur area (P ≤ 0.009). Conclusions This study quantified the effects of and differences between various reclining wheelchair–sitting assistive device combination modes. These findings are useful for the decision-making processes of rehabilitation physicians, wheelchair users, and manufacturers.
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Affiliation(s)
- Chun-Ting Li
- Applied Biomechanics Laboratory, Graduate Institute of Mechatronic System Engineering, National University of Tainan, No. 33, Sec. 2, Shu-Lin St., West Central Dist., Tainan, 70005, Taiwan
| | - Kuo-Yuan Huang
- Department of Orthopedics, College of Medicine, National Cheng Kung University Hospital, No.138, Sheng-Li Rd., North Dist., Tainan, 70403, Taiwan
| | - Chien-Feng Kung
- Graduate Institute & Department of Information Management, National Kaohsiung University of Applied Sciences, No. 415, Chien-Kung Rd., Sanmin Dist., Kaohsiung, 80778, Taiwan
| | - Yen-Nien Chen
- Department of BioMedical Engineering, National Cheng Kung University, No. 1, University Rd., East Dist., Tainan, 70101, Taiwan
| | - Yen-Ting Tseng
- Applied Biomechanics Laboratory, Graduate Institute of Mechatronic System Engineering, National University of Tainan, No. 33, Sec. 2, Shu-Lin St., West Central Dist., Tainan, 70005, Taiwan
| | - Kuen-Horng Tsai
- Applied Biomechanics Laboratory, Graduate Institute of Mechatronic System Engineering, National University of Tainan, No. 33, Sec. 2, Shu-Lin St., West Central Dist., Tainan, 70005, Taiwan.
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