ABSTRACT
Objective The present study was conducted to investigate the perception of haze among pregnant women and to provide basis for developing interventions.Methods A pregnant woman who has been living in Shunyi district for at least six months has been selected as the subject of investigation. A self-designed questionnaire was used to conduct field investigation. Results A total of 320 questionnaires were collected, including 308 valid questionnaires and 96.25% effective questionnaires. In terms of the cognitive aspects of haze, pregnant women think that there is a serious harm to the respiratory system, and 52.27%(161/308)of pregnant women think that the haze is harmful to the cardiovascular system. In the area of haze protection, 79.22%(244/308)of pregnant women wear masks when they go out. Pregnant women who are in the haze of 100.00% (308/308)will reduce window ventilation time. Access to information about haze information and protection knowledge is mainly including mobile phones(83.12%), network(44.16%)and TV(23.38%). The multi-factor logistic regression analysis showed that the haze was harmful to the health of the fetus (OR=0.12, 95%CI: 0.031-0.446), which was the influencing factor of the pregnant women's haze protection measures. Conclusion Pregnant women in Shunyi District have higher awareness of haze knowledge, and the influencing fact of the measures on the haze weather is the cognition that the haze is harmful to the health of the fetus.
ABSTRACT
<p><b>OBJECTIVE</b>To study neck and shoulder work-related muscle fatigue of female sewing machine operators.</p><p><b>METHODS</b>18 health female sewing machine operators without musculoskeletal disorders work in Beijing garment industry factory as volunteers in participate of this study. The maximal voluntary contraction (MVC) and 20% MVC of bilateral upper trapezium and cervical erectors spinae was tested before sewing operations, then the whole 20 time windows (1 time window = 10 min) sewing machine operations was monitored and the surface electromyography (sEMG) signals simultaneously was recorded after monitoring the 20%MVC was tested. Use amplitude analysis method to reduction recorded EMG signals.</p><p><b>RESULTS</b>During work, the median load for the left cervical erector spinae (LCES), right cervical erector spinae (RCES), left upper trapezium (LUT) and right upper trapezium (RUT) respectively was 6.78 ± 1.05, 6.94 ± 1.12, 5.68 ± 2.56 and 6.47 ± 3.22, work load of right is higher than the left; static load analysis indicated the value of RMS(20%MVC) before work was higher than that value after work, the increase of right CES and UT RMS(20%MVC) was more; the largest 20%MVE of bilateral CES occurred at 20th time window, and that of bilateral UT happened at 16th.</p><p><b>CONCLUSIONS</b>The work load of female sewing machine operators is sustained "static" load, and work load of right neck-shoulder is higher than left, right neck-shoulder muscle is more fatigable and much serious once fatigued.</p>