[Clinical analysis of food serum specific IgE in children with allergic rhinitis in Tianjin].

Objective: To define the common food allergens in children with allergic rhinitis in Tianjin with detection of serum specific immunoglobulin E(IgE) against foods and inhalation.Method:Mediwiss(Screen Allergy) was used to determine serum specific IgE. The relationships between food allergy and gender, age, season were also analyzed.Result:Most common food allergens in children with AR in Tianjin are milk(17.28%), followed by egg white(13.79%), crab(9.56%) and cashew nuts(8.64%). Children in food-related allergy group were significantly less than that in the inhalation-related allergy group, the difference was statistically significant（P <0.05）. Among food-related allergy group, one hundred and ninty four cases are both sensitive to food allergens and inhalation allergens, and the other 34 cases are only sensitive to food allergens. There were significant differences about the positive rate of allergy between different age groups(P <0.01).There was no significant difference in the total food allergens sensitivity rate between different gender and seasonal groups（P >0.05）. The cashew and beef allergen sensitivity rates are different between male and female. The sensitivity rates of amaranth, egg, white milk, and crab are different among different age groups. The difference was statistically significant（P <0.05）.Conclusion: Milk, egg, crab, cashew nuts are the most common food allergens in children with AR in Tianjin area. Only food-related allergy is rare, food allergies are usually accompanied by inhalation-related allergy. Cashew allergen sensitivity rate was higher in male than female. Milk allergen sensitivity rate was higher in female than male. Sensitivity rate of amaranth allergen increased significantly, while that of egg milk and crab allergen decreased significantly with age.

[Biomechanics study during march with different military equipment of equal carrying load].

The purpose of the study is to select the best military equipment of equal carrying load by the index of biomechanics. Six healthy young men whose age varied between 19 and 25 years were volunteered, in the experiment. They were required to march 1.5 h, carried with different military equipment of equal weight, 25 kg, at a speed of 5 km/h. The centre of gravity of the body and its kinesic parameters were measured before and after the march. The frequency and length of pace were measured during the march. The results of the study indicated that the displacement of the body's centre of gravity carrying equipment I was the most evident, whereas the least displacement of centre of gravity of the body was that carrying equipment II. The frequency of pace during the march was reduced in all three carrying different kinds of equipment, the most evident being that carrying equipment I; the length of pace became bigger with those carrying equipment II and III; the speed of pace was decelerated using equipment I, but it was quickened with equipment II. The change of kinesic parameters have no significant difference among the three. In summary; equipment II conforms best to biomechanical principles, whereas equipment I is the worst.

[Study of work efficiency under high temperature environment and reasonable arrangement of work time].

The significant relationship of water loss rate (WLR) to air temperature and work intensity when people work in hot environment was developed in the field study 4000 g of water loss for a working day and 500 g for a working hour was used as the upper limitation for heat exposure, then the Allowable Continuous Heat Exposure Time (ACHET) and Total Heat Exposure Time (THET) were calculated at different air temperature and work intensity. In order to confirm the ACHET derived from field study, WLR and some other physiological examinations were done to the subjects in lab study. And the necessary rest time after each ACHET was also estimated by way of observing the recovery of physiological indexes of subjects.