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On the Cause of Experienced C are W orkers ’ Lower B ack Pain : Considering Posture and the Strength of Back M uscle. Ryuichi ITO [email protected] Production Engineering of Advanced Engineering Course Niihama National College of Technology

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On the Cause of Experienced Care Workers’ Lower Back Pain:Considering Posture and the Strength of Back Muscle

RyuichiITO

[email protected]

Production Engineering of Advanced Engineering Course

Niihama National College of Technology

Japan-Taiwan symposium In 2012, In Taiwan


Background
Background

In Japan, 70 % of people in the care workers have complained of lower back pain.

but

  • People who are involved in care workers for many years is not that always cause lower back pain.

  • Some care workers continue to work

  • even if they have lower back pain.

  • In other words:

  • There are points unlikely to be lower back pain.


Experimental m ethod
Experimental Method

Examinee(18 pairs in total)

  • Care workers, and students of college of welfare

    make 9 pairs within each group.

    Patient(1 person)

  • We assumed patient who requires full support.

  • Bathing care by two-persons

  • She is female student who is weight about 48 kg.

    After the experiment, the patient evaluates

    the care level of comfort in five point scales.


Three dimensional m otion a nalysis s ystem
Three-Dimensional Motion Analysis System

20 points

in total

Infrared marker

front

back

Infrared camera

Model of marker


O peration of bathing s ervices
Operation of Bathing Services

From

edge of

bathtub

to

bottom of

bathtub

From

wheelchair

to

edge of

bathtub

There are four patterns.

Task1

Task2

from

bottom of

bathtub

to

edge of

bathtub

from

edge of

bathtub

to

wheelchair

Task3

Task4


T he p atient e valuates the care level of comfort in five p oint scales
The Patient Evaluates the Care Level of Comfort in Five Point Scales

Excellent group

Fair group

Middle group


Definition of w aist angle
Definition of Waist Angle (θ)

neck

vertical direction

model of waist angle

θ

waist


Moment round the waist of care worker
Moment Round the Waist of Care Worker

Lg

F・LS・Sin(θ)

F

WP・LS・Sin(θ)

θ‘

θ

LS

WC

L

WP

WC・Lg・Sin(θ’) 

(θ)


Strength of back muscle f necessary in caring posture
Strengthof back muscle : Fnecessary in caring posture

Moment of F> 

Moment of WP+ Moment of WC

F> WP+0.3・W c total

F・LS・     >WP・LS・+ WC・Lg・

Sin(θ)

Sin(θ)

Sin(θ)

LS / LS

F   > WP・+ WC・Lg/LS

H=height LS=0.28・H Lg=0.14・H WC=0.6・W c total

F> WP+0.6・W c total・(0.14H)/(0.28H)


Assuming as follows
Assuming as follows;

  • F > WP + 0.3 ・ WC

Care worker : weight is 60 (kg)

Patient : weight is 50 (kg)

F : Strength of back muscle

F > 50 + 0.3 ・ 60 = 68 (kg)

If strength of back muscle of him is

value less than 70 (kg),

he has higher risk of lower back pain.


Definition of roundness of the back
Definition of Roundness of the back (τ)

back1

back2

τ

waist

Model of roundness of the back


C orrelation d iagram of strength of back m uscle and roundness of the back
Correlation Diagram of Strength of Back Muscle and Roundness of the Back

Strength of Back Muscle [kgf]


Conclusion
Conclusion

  • The risk of the lower back pain increases.

    1. When expert care workers’ strength of

    back muscle is less than “Wp+0.3*Wc”,

    even if he has not had lower back pain.

    2. When care workers have the posture of

    large roundness of the back.


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