A national cross-sectional study in the Danish wood and furniture industry on working postures and manual materials handling.

Musculoskeletal disorders constitute a major problem in the wood and furniture industry and identification of risk factors is needed urgently. Therefore, exposures to different work tasks and variation in the job were recorded based on an observation survey in combination with an interview among 281 employees working in wood working and painting departments. A questionnaire survey confirmed high frequencies of symptoms from the musculoskeletal system: The one-year prevalence of symptoms from the low back was 42% and symptoms from the neck/shoulder was 40%. The exposure was evaluated based on: (1) classification of work tasks, (2) work cycle time, (3) manual materials handling, (4) working postures, and (5) variation in the job. Among the employees 47% performed feeding or clearing of machines, 35% performed wood working or painting materials, and 18% performed various other operations. Among the employees 20% had no variation in their job while 44% had little variation. Manual materials handling of 375 different burdens was observed, which most often occurred during feeding or clearing of machines. The weight of burdens lifted was 0.5-87.0 kg, where 2% had a weight of more than 50 kg. Among the lifting conditions 30% were evaluated as implying a risk of injury. An additional risk factor was the high total tonnage lifted per day, which was estimated to range from 132 kg to 58,800 kg. Working postures implied a risk of injury due to prolonged forward and lateral flexions of the neck, which was seen most frequently during wood working or painting materials. These data substantiate the finding that work tasks mainly during feeding or clearing of machines imply a risk of injury to the low back and a risk of injury to the neck and shoulder area mainly during wood working or painting materials. Optimal strategies for job redesign may be worked out by using these data in order to prevent occupational musculoskeletal disorders.

[1]  Jan Persson,et al.  Disorders of the cervicobrachial region among female workers in the electronics industry: A two-year follow up , 1988 .

[2]  G Sjøgaard,et al.  Muscle energy metabolism and electrolyte shifts during low-level prolonged static contraction in man. , 1988, Acta physiologica Scandinavica.

[3]  D Westerling,et al.  Pain from the Neck-Shoulder Region and Sick Leave , 1980, Scandinavian journal of social medicine.

[4]  I Kuorinka,et al.  Prevalence of neck and upper limb disorders (NLD) and work load in different occupational groups. Problems in classification and diagnosis. , 1982, Journal of human ergology.

[5]  W M Keyserling.  Analysis of manual lifting tasks: a qualitative alternative to the NIOSH work practices guide. , 1989, American Industrial Hygiene Association journal.

[6]  M Damlund,et al.  Low-back pain and early retirement among Danish semiskilled construction workers. , 1982, Scandinavian journal of work, environment & health.

[7]  H. Christensen,et al.  Quantitative surface EMG during sustained and intermittent submaximal contractions. , 1988, Electroencephalography and clinical neurophysiology.

[8]  K Jørgensen,et al.  Blood pressure, heart rate and EMG in low level static contractions. , 1985, Acta physiologica Scandinavica.

[9]  M Hagberg,et al.  Electromyographic signs of shoulder muscular fatigue in two elevated arm positions. , 1981, American journal of physical medicine.

[10]  M Hagberg,et al.  Work load and fatigue in repetitive arm elevations. , 1981, Ergonomics.

[11]  K. Jørgensen,et al.  Trunk strength, back muscle endurance and low-back trouble. , 2020, Scandinavian journal of rehabilitation medicine.

[12]  J. Kelsey.  An epidemiological study of the relationship between occupations and acute herniated lumbar intervertebral discs. , 1975, International journal of epidemiology.

[13]  D Coggon,et al.  Occupational causes of low-back pain. , 1989, Scandinavian journal of work, environment & health.

[14]  B. Jonsson,et al.  Standardised Nordic questionnaires for the analysis of musculoskeletal symptoms. , 1987, Applied ergonomics.

[15]  S Yamamoto,et al.  Visual, musculoskeletal and neuropsychological health complaints of workers using videodisplay terminal and an occupational health guideline. , 1987, Japanese journal of ophthalmology.

[16]  M. Estryn-behar,et al.  Strenuous working conditions and musculo-skeletal disorders among female hospital workers , 1990, International archives of occupational and environmental health.

[17]  F. Biering-Sørensen,et al.  Low back trouble in a general population of 30-, 40-, 50-, and 60-year-old men and women. Study design, representativeness and basic results. , 1982, Danish medical bulletin.

[18]  H. Christensen,et al.  Muscle activity and fatigue in the shoulder muscles of assembly-plant employees. , 1986, Scandinavian journal of work, environment & health.

[19]  Jan Persson,et al.  Disorders of the cervicobrachial region among female workers in the electronics industry , 1986 .

[20]  P Vinzents,et al.  A national cross-sectional study of the working environment in the Danish wood and furniture industry--air pollution and noise. , 1993, The Annals of occupational hygiene.

[21]  I. Kuorinka,et al.  Occupational rheumatic diseases and upper limb strain in manual jobs in a light mechanical industry. , 1979, Scandinavian journal of work, environment & health.

[22]  A. Garg,et al.  Maximum acceptable weights, heart rates and RPEs for one hour's repetitive asymmetric lifting. , 1988, Ergonomics.

[23]  A Magora,et al.  Investigation of the relation between low back pain and occupation. 3. Physical requirements: sitting, standing and weight lifting. , 1972, IMS, Industrial medicine and surgery.

[24]  A Garg,et al.  An evaluation of the NIOSH guidelines for manual lifting, with special reference to horizontal distance. , 1989, American Industrial Hygiene Association journal.