Background Incidence and risk factors of parachute injuries has been studied in developed countries, but not in trainees of the airborne forces in the Royal Thailand Army. Methods A prospective cohort study was conducted among 992 military personnel who attended the basic airborne training program from February to July 2018. Information sheets were used to collect data about (a) personal demographics; (b) environmental conditions surrounding the parachute practice; and (c) parachute-related injuries. The incidence rate of injury was then calculated. Risk factors were examined using multilevel Poisson regression analysis and presented as incidence rate ratio (IRR) and 95% confidence interval (95% CI). Results A total of 166 parachute-related injuries occurred in 4677 jumps. The incidence rate of injury was 35.50 per 1000 jumps (95%CI: 30.04–41.21). Factors significantly related to parachute injury included: jumping with equipment versus without equipment [adjusted IRR (95% CI): 1.28 (0.88–1.87)], higher wind speed [1.54 (1.27–1.87) per knot], airplane versus helicopter exit [1.75(0.68–4.55)], side versus rear exit [2.13 (1.43–3.23)], night versus day jumping [2.19 (0.81–5.90)], and presence of motion sickness [3.43 (1.93–6.92)]. Conclusions To prevent military static line parachute injuries, the following factors should be taken into consideration: type of aircraft, aircraft exit, time of the day, equipment, motion sickness and wind speed. Trial registration The project was certified by the Research Ethics Committee, Faculty of Medicine, Chulalongkorn University (IRB No. 697/60).

IntroductionHeat injury is a common illness among new conscripts during basic training course in Thailand and heat stroke is a major cause of death. There are a lot of methods to reduce the body temperature of conscripts to prevent heat injury. The conscripts are allowed to take a bath in the evening every day as regular bath during training. Daytime bath is one of the procedures. The objective of this study is to compare the effectiveness between daytime bath and regular bath for heat injury prevention among new conscripts in training unit.MethodsA quasi-experimental study was conducted in 93 new conscripts in training unit. The data of their body temperature before and after daytime bath in the time of 1200 and 0300 pm were collected. The body temperature data after regular bath were collected in the time of 0600 pm. The paired t–test was used to compare the difference between body temperature means before and after daytime bath and ANOVA was used to compare the difference between body temperature means after daytime bath and regular bath.ResultsThere were 93 conscripts participating in this study with response rate of 100%. The results of the analyses showed that the body temperature after daytime bath is lower than before bath in statistically significant (p<0.05). But, the difference of body temperature between daytime bath and regular bath is not statistically significant. (p>0.05).DiscussionBoth regular and daytime bath showed effectiveness in decreasing body temperature. Therefore, daytime bath can be used as additional method to reduce body temperature in the daytime period to prevent heat injury.

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