[논문]Effect of Tactile Feedback on Trunk Posture and EMG Activity in People With Postural Kyphosis During VDT Work

Park, Joo-hee; Kang, Sun-young; Cynn, Heon-seock; Jeon, Hye-seon

doi:10.12674/ptk.2016.23.3.048

Effect of Tactile Feedback on Trunk Posture and EMG Activity in People With Postural Kyphosis During VDT Work 원문보기

한국전문물리치료학회지 = Physical Therapy Korea, v.23 no.3, 2016년, pp.48 - 56

Park, Joo-hee (Dept. of Physical Therapy, The Graduate School, Yonsei University) , Kang, Sun-young (Company-affiliated Research Institute, Korea Industry Development Institute) , Cynn, Heon-seock (Dept. of Physical Therapy, College of Health Science, Yonsei University) , Jeon, Hye-seon (Dept. of Physical Therapy, College of Health Science, Yonsei University)

Abstract ▼ AI-Helper

Background: Recently, there has been an emphasis on the use of interventions with biofeedback information for the maintenance or correction of posture. Objects: This study assessed the change of trunk posture and trunk muscle activation when people exhibiting postural kyphosis performed visual display terminal work with or without a contact feedback device (CFD). Methods: Eighteen right-handed individuals were recruited. Thoracic angle and right thoracic erector spinae (TES) muscle amplitude were analyzed. There were two sessions in these experiments. The control session involved 16 minutes of typing without a CFD, and the CFD session involved 16 minutes of typing with a CFD. The visual analog scale score was analyzed with a paired t-test, and the kinematic and electromyography data were analyzed through two-way repeated analysis of variance. Results: The paired t-tests revealed that subjects had significantly less pain after the CFD sessions than after the control sessions (p<.05). Significant main effects by session and by time were observed in the thoracic kyphosis angle (p<.05). There was a significant session${\times}$time interaction for TES amplitude (p<.05), along with significant main effects by session and by time (p<.05). Conclusion: The CFD caused people with postural kyphosis to straighten and to activate their TES continuously, even though they were habituated to bend their bodies forward. Therefore, the CFD was a beneficial treatment tool.

주제어

AI 본문요약
AI-Helper

* AI 자동 식별 결과로 적합하지 않은 문장이 있을 수 있으니, 이용에 유의하시기 바랍니다.

문제 정의

This study investigated the effects of CFDs on postural kyphosis patients. The CFD was designed to provide tactile feedback to the chest as a reminder to maintain an upright posture for VDT workers who perform prolonged VDT tasks.

제안 방법

To minimize the undesirable effects of the monitor position, such as neck and shoulder discomfort, we adjusted the monitor height so that the viewing angle was 5° to 15° below the horizontal sight line (Liao and Drury, 2000). After sitting comfortably in this position, the subjects were asked to focus completely on a 16 minutes typing task which was provided by a commercial typing practice program (Hancom 2015, Hancom, Gyeonggi-do, Korea). Subjects could achieve higher scores by completing the exercise at a higher speed with fewer errors.
All participants performed VDT tasks in two different sessions: a control session and a CFD session.In the control session, they performed a 16 minutes typing task without a CFD (Figure 3A), while in the CFD session, they performed the same task with a CFD (Figure 3B).
We asked all subjects to try to maintain contact between their xiphoid process and the CFD, but we prohibited leaning toward the CFD. An examiner monitored the amount of leaning pressure on the CTD using a Footscan program (F-Scan Versa System, Tekscan Inc., MA, USA). If the examiner detected any unwanted leaning through the pressure sensor during the recording screen, the examiner gave a verbal cue not to lean on the pad.
In this study, subjects started VDT work in a more upright posture and maintained the straight posture they achieved (150°) during 16 minutes of typing when the CFD was provided.
The IK has been used as an indirect measure of the degree of curvature of the upper spine, and can be determined with the flexicurve (Hinman, 2004). The subject was instructed to stand in his/her normal comfortable posture, and the flexicurve was placed with one end at the spinous process of C7 and the other end at the T12 vertebra. Then, the instrument was molded to the spinous processes between these two landmarks.
Upon completion of each session of typing, subjects were asked to record the level of pain in their trunks on a visual analog scale (VAS) ranging from 0 to 10. The VAS has been considered as a reliable (intra-class correlation coefficient=.
, Scottsdale, AZ, USA). We compared the median frequency values of the TES EMG during the first 1 minute of VDT work in each session, in order to verify whether muscle fatigue resulting from the VDT work during the 16 minutes control session influenced the CFD session. The root mean square (RMS) EMG value was used as a measure of EMG amplitude.

대상 데이터

As a first step, we observed the trunk posture of 240 physical therapy students while they were sitting in a class for one hour, and selected 32 students who had kyphotic tendencies in the classroom. Ultimately, 18 right-handed individuals (male: 8, female: 10) who met the following inclusion and exclusion criteria were recruited for this study.
Kinematic data were recorded with a VICON MX system (Oxford Metrics Group, Oxford, UK) with six infrared cameras. Four spherical reflexive markers were attached along the thoracic curve on the 7th cervical (C7) vertebra, 10th thoracic (T10) vertebra, SP1 and SP2.

데이터처리

The VAS score and median frequencies were analyzed with a paired t-test, and the kinematic data and EMG amplitudes were compared through two-way repeated analysis of variance (sessions×time).

성능/효과

Postural thoracic kyphosis can be treated with posture reeducation and focused strengthening of the extensor muscles (Seidi et al, 2013). Based on the findings of this study, sitting with a CFD is highly beneficial for postural kyphosis patients who unconsciously flex their thoraxes while performing their occupational duties. It encouraged not only the maintenance of a straight posture, but also the continuous activation of the TES.

참고문헌 (31)

Ahn S, Kim S, Kang S, et al. Asymmetrical change in the pelvis and the spine during cross-legged sitting postures. Journal of Mechanical Science and Technology. 2013;27(11):3427-3432.

상세보기
Bijur PE, Silver W, Gallagher EJ. Reliability of the visual analog scale for measurement of acute pain. Acad Emerg Med. 2001;8(12):1153-1157.

상세보기
Brandt LPA, Andersen JH, Lassen CF, et al. Neck and shoulder symptoms and disorders among Danish computer workers. Scand J Work Environ Health 2004;30(5):399-409.

상세보기
Burgess-Limerick R, Plooy A, Fraser K, et al. The influence of computer monitor height on head and neck posture. Int J Erogonom. 1999;23(3):171-179.

상세보기
Callaghan JP, Dunk NM. Examination of the flexion relaxation phenomenon in erector spinae muscles during short duration slumped sitting. Clin Biomech (Bristol, Avon). 2002;17(5):353-360.

상세보기
Carter JB, Banister EW. Musculoskeletal problems in VDT work: A review. Ergonomics. 1994;37(10):1623-1648.

상세보기
Colloca CJ, Hinrichs RN. The biomechanical and clinical significance of the lumbar erector spinae flexion-relaxation phenomenon: A review of literature. J Manipulative Physiol Ther. 2005;28(8):623-631.

상세보기
Cutler WB, Friedmann E, Genovese-Stone E. Prevalence of kyphosis in a healthy sample of pre-and postmenopausal women. Am J Phys Med Rehabil. 1993;72(4):219-225.

상세보기
Epstein ML, Brosvic GM, Costner KL, et al. Effectiveness of feedback during the testing of preschool children, elementary school children, and adolescents with developmental delays. The Psychological Record. 2003;53(2):177-195.

상세보기
Eum R, Leveille SG, Kiely DK, et al. Is kyphosis related to mobility, balance and disability? Am J Phys Med Rehabil. 2013;92(11):980-989. http://dx.doi.org/10.1097/PHM.0b013e31829233ee

상세보기
Florence JM, Pandya S, King WM, et al. Intrarater reliability of manual muscle test (Medical Research Council Scale) grades in Duchenne's muscular dystrophy. Phys Ther. 1992;72(2):115-122.

상세보기
Fujimaki G, Mitsuya R. Study of the seated posture for VDT work. Displays. 2002;23(1-2):17-24.

상세보기
Gigante M, Sciascia G, Basso A, et al. Could VDT use induce thoracic hyperkyphosis? Preliminary data. G Ital Med Lav Ergon. 2005;27(1):119-123.
Hart ES, Merlin G, Harisiades J, et al. Scheuermann's thoracic kyphosis in the adolescent patient. Orthop Nurs. 2010;29(6):365-371. http://dx.doi.org/10.1097/NOR.0b013e3181f83761

상세보기
Hinman MR. Comparison of thoracic kyphosis and postural stiffness in younger and older women. Spine J. 2004;4(4):413-417.

상세보기
Hinman MR. Interrater reliability of flexicurve postural measures among novice users. J Back Musculoskelet Rehabil. 2003;17(1):33-36.
Kang CH, Shin MJ, Kim SM, et al. MRI of paraspinal muscles in lumbar degenerative kyphosis patients and control patients with chronic low back pain. Clin Radiol. 2007;62(5):479-486.

상세보기
Lewis JS, Valentine RE. Clinical measurement of the thoracic kyphosis. A study of the intra-rater reliability in subjects with and without shoulder pain. BMC Musculoskelet Disord. 2010;11:39. http://dx.doi.org/10.1186/1471-2474-11-39

상세보기
Liao MH, Drury CG. Posture, discomfort and performance in a VDT task. Ergonomics. 2000;43(3):345-359.

상세보기
Lou E, Lam GC, Hill DL, et al. Development of a smart garment to reduce kyphosis during daily living. Med Biol Eng Comput. 2012;50(11):1147-1154. http://dx.doi.org/10.1007/s11517-011-0847-7

상세보기
Marcus M, Gerr F, Monteilh C, et al. A prospective study of computer users: Ii. Postural risk factors for musculoskeletal symptoms and disorders. Am J Ind Med. 2002;41(4):236-249.

상세보기
Morl F, Bradl I. Lumbar posture and muscular activity while sitting during office work. J Electromyogr Kinesiol. 2013;23(2):362-368. http://dx.doi.org/10.1016/j.jelekin.2012.10.002

상세보기
Milne JS, Williamson J. A longitudinal study of kyphosis in older people. Age Ageing. 1983;12(3):225-233.

상세보기
Neumann DA. Kinesiology of the Musculoskeletal System: Foundations for rehabilitation. 2nd ed. St Louis, Mosby, 2013:357-358, 369-373.
O'Sullivan K, O'Sullivan L, O'Sullivan P, et al. Investigating the effect of real-time spinal postural biofeedback on seated discomfort in people with non-specific chronic low back pain. Ergonomics. 2013;56(8):1315-1325. http://dx.doi.org/10.1080/00140139.2013.812750

상세보기
Panjabi MM. The stabilizing system of the spine. Part II. Neutral zone and instability hypothesis. J Spinal Disord. 1992;5(4):390-396.

상세보기
Sawdon-Bea J. Effects of a 10-week exercise intervention on thoracic kyphosis, pulmonary function, endurance, back extensor strength, and quality of life in women with osteoporosis. Denton, Texas Woman's University. Doctoral Dissertation. 2010.
Seghers J, Jochem A, Spaepen A. Posture, muscle activity and muscle fatigue in prolonged vdt work at different screen height settings. Ergonomics. 2003;46(7):714-730.

상세보기
Seidi F, Rajabi R, Ebrahimi I, et al. The efficiency of corrective exercise interventions on thoracic hyper-kyphosis angle. J Back Musculoskelet Rehabil. 2014;27(1):7-16. http://dx.doi.org/10.3233/BMR-130411

상세보기
Sinaki M, Itoi E, Rogers JW, et al. Correlation of back extensor strength with thoracic kyphosis and lumbar lordosis in estrogen-deficient women. Am J Phys Med Rehabil. 1996;75(5):370-374.

상세보기
Yoo WG, Yi CH, Kim MH. Effects of a proximitysensing feedback chair on head, shoulder, and trunk postures when working at a visual display terminal. J Occup Rehabil. 2006;16(4):631-637.

상세보기

저자의 다른 논문 :

표제어: PCR

동의어: Packet Collision Rate

용어 설명 출처 목록 (6)

용어 설명: PCR은 세균 특이성이 있는 primer를 이용하여 적은 수의 세균이 있을지라도 쉽게 검출할 수 있는 유용한 방법이며, 이를 이용하여 구강 내 치면세균막이나 타액에서 직접 세균을 검출할 수 있게 되었다[8].

내보내기 구분	파일저장 인쇄 메일전송
구성항목	기본정보 상세정보 관리번호, 논문명, 저널/프로시딩명, 저자 , 발행년, 권, 호, 시작페이지, 끝페이지, 발행기관 관리번호, 논문명, 대등논문명, 저자 , 저널/프로시딩명, 발행기관, 발행년, 발행언어, 권, 호, 시작페이지, 끝페이지, ISBN, ISSN, 주제분야, 키워드, 초록(한글), 초록(영문), 저자(소속기관)
저장형식	Text(ASCII format) Excel format RefWorks Direct Export RIS format (for Reference Manager, ProCite, EndNote), Scholar's Aids, Mendeley
메일정보	받는사람 (필수) @ 보내는사람 (선택) @ 제목 내용 KISTI 검색결과 이메일 서비스
안내	총 건의 자료가 검색되었습니다. 다운받으실 자료의 인덱스를 입력하세요. (1-10,000) 검색결과의 순서대로 최대 10,000건 까지 다운로드가 가능합니다. 데이타가 많을 경우 속도가 느려질 수 있습니다.(최대 2~3분 소요) 다운로드 파일은 UTF-8 형태로 저장됩니다. 파일의 내용이 제대로 보이지 않을실 때는 웹브라우저 상단의 보기 -> 인코딩 -> 자동선택 여부를 확인하십시오. ~ Text(ASCII format) Excel format

연합인증