Effect of postural angle on back muscle activities in aging female workers performing computer tasks

Kamil, Nabilla Sofia Mohd; Dawal, Siti Zawiah Md

doi:10.1589/jpts.27.1967

Cited by 15 publications

(9 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This study found that seat height and body posture significantly influence the activity of the superior trapezius and longissimus muscles. Additionally, sitting with the trunk leaning forward resulted in a significant increase in the EMG activity of both muscles, corroborating the study of Kamil and Dawal 13 ) . This is a relevant finding considering that many current daily and work-related activities are performed in a seated posture, with some forward inclination of the trunk and neck 3 , 6 , 10 ) .…”

Section: Discussionsupporting

confidence: 89%

“…Previous studies have addressed the influence of body posture and seat characteristics on muscle activity 1 , 11 , 12 ) . The study by Kamil and Dawal 13 ) demonstrated that there is a correlation between postural angle (trunk and pelvic angles) and the activity of the erector spinae, multifidus and cervical erector spinae muscles. The authors found that postures close to neutral (upright) required lower muscle activation than those with the trunk leaning forward.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The influence of seat height, trunk inclination and hip posture on the activity of the superior trapezius and longissimus

et al. 2016

View full text Add to dashboard Cite

[Purpose] This study was aimed at investigating the influence of seat height and body posture on the activity of the superior trapezius and longissimus muscles. [Subjects and Methods] Twenty two healthy subjects were instructed to perform a total of eight different body postures, varying according three main factors: seat height (low and high seat); trunk inclination (upright and leaning forward at 45°); and the hips in abduction and adduction. Electromyography of the superior trapezius and longissimus was collected bilaterally, and the average values were obtained and compared across all the postures. [Results] The activity of the superior trapezius and longissimus significantly changes according to the seat height and trunk inclination. For both seat heights, sitting with trunk leaning forward resulted in a significant increase in the activity of both muscles. When sitting in a high seat and the trunk leaning forward, the superior trapezius activity was significantly reduced when compared to the same posture in a low seat. [Conclusion] This study contributes to the knowledge on the influence of the body posture and seat configuration on the activity of postural muscles. Reducing the biomechanical loads on the postural muscles must be targeted in order to improve users’ comfort and safety.

show abstract

Section: Discussionsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

The influence of seat height, trunk inclination and hip posture on the activity of the superior trapezius and longissimus

et al. 2016

View full text Add to dashboard Cite

show abstract

“…All subjects read and signed a written informed consent prior to participation in the study. (30,31). In alignment with previous studies, the postures the sacral tilt and third lumbar vertebrae (L3) were recorded.…”

Section: Participantsmentioning

confidence: 99%

“…Over the 1-hour sitting period, the degree of tilt of the sacrum and lumbar spine (15,30) were recorded. Pain levels (19,23) were also recorded at baseline and every 10 minutes throughout the sitting protocol.…”

Section: Participantsmentioning

confidence: 99%

A Comparison of Lumbosacral Kinematics during Prolonged Sitting in Non-specific Chronic Low Back Pain Subgroups; a cross-sectional study

Alameri¹,

Daher²,

Dudley³

et al. 2019

Preprint

View full text Add to dashboard Cite

Background: Although, non-specific chronic low back pain (NSCLBP) has been associated with abnormal lumbosacral kinematics, little is known about the possible driving mechanisms of pain development overtime during prolonged sitting period. Therefore, the purpose of this study was to examine the differences in lumbosacral postures in adults with and without NSCLBP, and their role on pain development during a 1-hour of prolonged sitting task. Methods: Twenty NSCLBP subjects with motor control impairment (MCI) [10 classified as having flexion pattern (FP) disorder, and 10 with active extension pattern (AEP) disorder], and 10 healthy controls participated in the study. Subjects underwent a 1-hour sitting protocol on a standard office chair. Lumbosacral postures including: sacral tilt (ST), third lumbar vertebrae (L3) position, and relative lower lumbar angle (RLLA) were recorded using a two-dimensional inclinometer over the 1-hour period. Perceived back pain intensity was recorded using a numeric pain rating scale every 10 minutes throughout the sitting period. Results: All study groups presented with significantly distinctive lumbosacral kinematics at the lowest level of pain (the beginning of the sitting period) (p<0.05), as well as at the highest level of pain (the end of the sitting period) (p£0.05). The MCI subgroups showed a significant deterioration in lumbosacral kinematics and pain levels overtime (p<0.01). The directions of deterioration in lumbosacral kinematics over the 1-hour sitting period occurred in the direction of the motor control impairment (kyphosis for FP subgroup or lordosis for the AEP subgroup). Both MCI subgroups reported a similarly significant increase in pain through mid-sitting (p<0.001). However, after mid-sitting, the AEP subgroup displayed a significantly reversed decrease in the lordotic postures (p=0.001) which was accompanied by much less increase in pain level compared to the FP subgroup. Conclusion : The present study’s findings suggest that MCI subgroups presented with distinctive underlying maladaptive postural patterns. However, the significant increase in pain over the 1-hour sitting might not be only attributed to the inherent maladaptive postures, also it may be related to the directional deterioration in lumbosacral postures overtime.

show abstract

“…The number of working environments involving interfaces with computers has been increasing recently, wherein the majority of employees spend an average of 7 hours a day working at the interfaces to complete their work [6]. Individuals with disabilities are able to work and socialize using computers [7, 8].…”

Section: Introductionmentioning

confidence: 99%

Effects of the Computer Desk Level on the Musculoskeletal Discomfort of Neck and Upper Extremities and EMG Activities in Patients with Spinal Cord Injuries

Kang¹,

Her

Lee

et al. 2019

Occupational Therapy International

View full text Add to dashboard Cite

Background. Computers are used as a means of social communication, for work and other purposes. However, patients with spinal cord injuries may have a higher risk than normal individuals with musculoskeletal problems when using computers owing to their inability to control respective postures due to problems in motor and sensory functioning.Objectives. This study is aimed at identifying the effect of computer desk heights on musculoskeletal discomforts of the neck and upper extremities and EMG activities in patients with spinal cord (C6) and upper thoracic spinal cord injuries.Methods. Participants of the present study were the patients diagnosed with ASIA A or B. The patients were divided into two groups according to their spinal cord injuries: C6 group and T2-T6 group. The level of the desk was set at 5 cm below the elbow, at the elbow level, and 5 cm above the elbow level. Electromyography was used to measure the duration of typing task EMG(%RVC) of the cervical erector spinae, upper trapezius, anterior deltoid, and wrist extensor. Subjective musculoskeletal discomfort (Borg-RPE) was measured at the end of the experiment.Results. The two groups showed differences in terms of RPE corresponding to each level of the computer desk (p<.05). Postanalysis revealed the C6 group had decreased RPE as the level of computer desk increased, whereas the subjects in the T2-T6 group had decreased RPE values in accordance with the decreasing level of computer desk (p<.05). In EMG, both groups had no significant differences (p>.05). However, in terms of the interaction between the muscles and the level of computer desk in both groups, the differences in the interactions of the upper trapezius and wrist extensor with each level of the desk were found (p<.05).Conclusion. This study is meaningful in that it confirms computer work posture and preference of spinal cord-injured individuals.

show abstract

Effect of postural angle on back muscle activities in aging female workers performing computer tasks

Cited by 15 publications

References 18 publications

The influence of seat height, trunk inclination and hip posture on the activity of the superior trapezius and longissimus

The influence of seat height, trunk inclination and hip posture on the activity of the superior trapezius and longissimus

A Comparison of Lumbosacral Kinematics during Prolonged Sitting in Non-specific Chronic Low Back Pain Subgroups; a cross-sectional study

Effects of the Computer Desk Level on the Musculoskeletal Discomfort of Neck and Upper Extremities and EMG Activities in Patients with Spinal Cord Injuries

Contact Info

Product

Resources

About