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BIO DESIGN

pISSN 1225-8962
eISSN 2287-982X

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Original Article

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Phys Ther Korea 2016; 23(3): 48-56

Published online September 17, 2016

https://doi.org/10.12674/ptk.2016.23.3.048

© Korean Research Society of Physical Therapy

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

Joo-hee Park1, MSc, PT, Sun-young Kang2, PhD, PT, Heon-seock Cynn3,4, PhD, PT, Hye-seon Jeon3,4, PhD, PT

1Dept. of Physical Therapy, The Graduate School, Yonsei University
2Company-affiliated Research Institute, Korea Industry Development Institute
3Dept. of Physical Therapy, College of Health Science, Yonsei University
4Dept. of Ergonomic Therapy, The Graduate School of Health and Environment, Yonsei University

Correspondence to: Hye-seon Jeon

Received: May 17, 2016; Revised: May 17, 2016; Accepted: June 23, 2016

Abstract

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×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.

Keywords: Feedback device, Postural kyphosis, Sitting posture, Thoracic erector spinae, Visual display terminal.

Article

Original Article

Phys Ther Korea 2016; 23(3): 48-56

Published online September 17, 2016 https://doi.org/10.12674/ptk.2016.23.3.048

Copyright © Korean Research Society of Physical Therapy.

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

Joo-hee Park1, MSc, PT, Sun-young Kang2, PhD, PT, Heon-seock Cynn3,4, PhD, PT, Hye-seon Jeon3,4, PhD, PT

1Dept. of Physical Therapy, The Graduate School, Yonsei University
2Company-affiliated Research Institute, Korea Industry Development Institute
3Dept. of Physical Therapy, College of Health Science, Yonsei University
4Dept. of Ergonomic Therapy, The Graduate School of Health and Environment, Yonsei University

Correspondence to:Hye-seon Jeon

Received: May 17, 2016; Revised: May 17, 2016; Accepted: June 23, 2016

Abstract

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×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.

Keywords: Feedback device, Postural kyphosis, Sitting posture, Thoracic erector spinae, Visual display terminal.

Fig 1.

Figure 1.

Contact feedback device (Emdel Pad, Emdel, Ansan, Korea).

Physical Therapy Korea 2016; 23: 48-56https://doi.org/10.12674/ptk.2016.23.3.048

Fig 2.

Figure 2.

Flexicurve measurement technique.

Physical Therapy Korea 2016; 23: 48-56https://doi.org/10.12674/ptk.2016.23.3.048

Fig 3.

Figure 3.

The posture during VDT work without the CFD (control session) (A) and with the CFD (CFD session) (B).

Physical Therapy Korea 2016; 23: 48-56https://doi.org/10.12674/ptk.2016.23.3.048

Fig 4.

Figure 4.

Post-hoc results of thoracic angle by session (A), Post-hoc results of EMG amplitude by session (B) (*p<.05).

Physical Therapy Korea 2016; 23: 48-56https://doi.org/10.12674/ptk.2016.23.3.048

Table 1 .. General characteristics of subjects (N=18).

Age (year)BMIa (kg/m2)Index of kyphosis

Subject21.6±1.4b21.5±1.913.6±.7

abody mass index

bmean±standard deviation.