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ERGONOMICS. THINKING ABT DEFINITION....PLS STOP. DEFINITION . ERGONOMICS is defined as the science related to man and his work, embodying the anatomic, physiologic, and mechanical principles affecting the efficient use of human energy. Stay cool.. here are the ERGONOMICS to follow on….
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DEFINITION • ERGONOMICS is defined as the science related to man and his work, embodying the anatomic, physiologic, and mechanical principles affecting the efficient use of human energy.
The posture depends upon the psychological, physical and surrounding environment of the person.
The spine is nothing but the series of bones which are strong and are supportive, at, to the back. • It gives stability by the close association of those vertebrae ,with the help of other supportive tissues.., like ligaments and muscles.
It has only 3 movements.., Flexion Extension Side flexion.
Before going to the topic here are the few facts ……. Among every 10 people in worlds software professionals, 3 are affected with a syndrome called “COMPUTER AFFECTIVE SYNDROME”… Which may include amongst is “RSI.”
CAUSES FOR INCREASING CLAIMS OF RSI IN INDUSTRIES: Bonus and OT incentives Work without rest Lack of proper training Failure of supervision Unsuitable tools
The continuous use of same body movement and sets of muscles responsible for that movement during the normal working shifts can lead to the onset initially of fatigue and ultimately of immediate or cumulative stress in local body area concerned.
The “COMPUTER” grabbed a major role in the life of people,,, and it has become an addiction to them such …. here are the few examples of them………
DEFINITION • An RSI is an injury caused by overusing muscles and bones through repeated movement that stresses the system. • OTHER NAMES ARE: Cumulative Trauma Disorder Repetitive Motion Injury.
Rapid repetitive movements • Lack of job variation • Inadequate rest breaks • Awkward positions • Poor tool and equipments • Increase in workload and timings • Improper use of equipment
Vibration • Excessive force • Changes in work force • Lack of control on work • Cold
SYMPTOMS • They range from SLIGHT SENSE OF DISCOMFORT to EXTREME PAIN. The symptoms actually include:
Pain, dull ache. • Loss of sensation (numbness) especially at nights. • Aches/pains worse at nights. • Tingling or burning sensations. • Swelling around wrist / hand. • Dry shiny palm.
Pins and needles discomfort. • Clumsiness. • Muscle weakness and fatigue. • Muscle spasm. • Joint restriction/loss of movement. • Crackling feeling when swollen tendons are pressed tightly. • Ganglion formation.
STAGES OF PAIN EARLY. TO INTERMEDIATE. TO ADVANCED.
RISK FACTORS • PSYCHOLOGICAL • ENVIRONMENTAL
PHYSICAL FORCE POSTURE FREQUENCY/DURATION
The REPETITIVE STRESS INJURIES occur due to the continuous stress on the part… • Hence these are classified in accordance to the part of the body undergoing stress directly or indirectly….
The following are the RSI’s occurring.. and the causes are also given……
EXTENSOR TENDINITIS FLEXOR TENDINITIS Affects the muscles that straighten the finger. caused by holding hands in the “stop traffic” position, as when using the mouse or keying. Affects the muscles used to bend fingers. caused by excessive finger motion or gripping of mouse.
GANGLION CYSTS:A tendon sheath disorder. Ruptured sheath swells with synovial fluid, causing a bump. From excessive bending and/or deviating the wrist or other joint.
STENOSING TENOSYNOVITIS Types: DeQuervain’s Disease, Trigger Finger Tendon moves with great difficulty through swollen sheath. DeQuervain’s Disease: affects tendons on side of wrist at base of thumb. From holding thumbs while typing or hard-hitting of space bar. Trigger Finger: tendon gets locked in swollen tendon sheath.
Deltoid is the muscle which gets wasted easily in the human body if its not used regularly and vigorously. • Its found that the deltoid muscle is seen weak in many of the computer operators as they less use this muscle.
In the next slide, you will see the main pressure points in the body when u sit on chair….
AT WORK PLACE • The following slides shows how the main parts of the human body should be at work place….
Sit back and let back of the chair support your upper body • Keep feet flat on the floor or use a footrest. • Hips should be at 90° to 130° open angle.
Avoid pressure on the back of the thighs from the front edge of chair. • Learn to adjust your chair. • Legs should move freely under the desk.
Position head over hips. • The monitor and keyboard should be directly in front of you. • Position the monitor about arms length away with the first line of type at eye level or slightly below.
Ideally your eyes should be positioned from 20 to 25" from the screen with the screen positioned lower (rather then higher) to reduce neck strain. • It is also important to take frequent breaks to give your eyes a rest from the strain of close focusing for long periods.
Hold the phone receiving rather than “cradling” it between shoulder and head. • Avoid glare on the monitor screen. • Use a document holder and take vision breaks regularly.
