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Objective@#To explore the relationship between 24 hour movement behavior and physical fitness in college students, so as to provide a reference for physical fitness interventions for college students.@*Methods@#A survey was conducted from September 23 to November 12, 2022, involving 342 college students selected from one comprehensive college among Shanghai City, Hubei Province and Zhejiang Province. Accelerometers were used to measure 24 hour movement behavior, and programs specified in the National Physical Fitness Standards for Students (2014 revision) were used to evaluate physical fitness. Compositional linear regression was used to analyze the association between 24 hour movement behavior and physical fitness. The effects of compositional isotemporal substitution of 24 hour movement behavior on physical fitness were also examined.@*Results@#The geometric means for sleep, sedentary behavior, light physical activity (LPA), and moderate to vigorous physical activity (MVPA) were 515.89, 678.88 , 196.30, 48.92 min/d, respectively, and the comprehensive physical fitness score was (73.09±8.55). The proportion of participants who passed the fitness test was 72.51%. Overall, 20.76% had excellent or good scores, whereas 6.73% failed. Compositional linear regression indicated that physical fitness was significantly positively associated with MVPA ( β =2.55) and LPA ( β = 5.88 )( P <0.05), but no significantly associated with sleep ( β =-5.18) and sedentary behavior ( β =-3.24)( P >0.05). Isotemporal substitution indicated that reallocation of 15 minutes from sleep and sedentary behavior to MVPA resulted in a 0.71 and 0.64 point increase in physical fitness, respectively. Similarly, reallocating the same duration to LPA led to a 0.50 and 0.43 point increase in physical fitness, respectively. Dose response analysis revealed that the mutual substitution of LPA with sedentary behavior and sleep had symmetry, whereas the mutual substitution of MVPA with sedentary behavior and sleep had asymmetry. The effectiveness of replacing sleep or sedentary behavior with MVPA in improving physical fitness decreased with increasing allocation time, whereas the adverse effects of replacing MVPA with sleep or sedentary behavior increased with increasing allocation time.@*Conclusion@#In the context of 24 hour movement behavior, increasing the time spent on LPA and MVPA is beneficial for physical fitness among college students. It should be recommend that college students actively transition from sedentary behavior to engaging in physical activity, with a particular emphasis on incorporating MVPA.
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Objective@#To analyze heavy metal health risks of direct drinking water in primary and secondary schools in Huangpi District, Wuhan, so as to provide reference basis for ensuring drinking water safety of teachers and students.@*Methods@#Cadmium (Cd), Plumbum (Pb) and arsenic (As) in water samples from primary and secondary schools were detected in accordance with the GB/T 5750-2006 "Standard Examination Methods for Drinking Water", water quality was evaluated based on the Quality Standard for Fine Drinking Water(CJ 94-2005). Health risk assessment model was used to evaluate the potential risk of heavy metals in direct drinking water in primary and secondary schools.@*Results@#The unqualified rates of Pb, Cd and As were 0.95%, 1.22% and 0 in 66 primary and secondary schools in Huangpi District, Wuhan. The risk of noncarcinogens related to the direct drinking water of heavy metals (Pb, Cd, As) were less than 1. The range of carcinogenic risks related to the direct drinking water was within the range of 1.07×10 -8 /year -5.58×10 -6 /year which were both within the acceptable level.@*Conclusion@#Concentrations of cadmium, plumbum and arsenic were not found to be significantly elevated as compared to "Quality Standard for Fine Drinking Water" in Huangpi District of Wuhan. Pb and Cd slightly exceeded the standard, with no significant health risk. Water quality and health risk assessment should be strengthened to ensure the safety of drinking water for teachers and students.
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Objective@# To explore the feasibility of curettage combined with fenestration for jaw classic ameloblastoma treatment and to provide a basis for improving the treatment of classic ameloblastoma. @*Methods@# Twenty-two patients with jaw classic ameloblastoma admitted to Liuzhou People’s Hospital from 2016 to 2019 were selected. They were treated by curettage combined with fenestration. Monthly follow-up visits were conducted after surgery, and orthopantomography was performed for reexamination to observe the recovery of bone and whether there was recurrence. @*Results @#Tumors were completely scraped off in 22 patients, no pathological fracture occurred, and no wound infection occurred after surgery. After 1 to 3 years of follow-up, 19 patients showed excellent bone recovery in the original tumor area, and no recurrence was observed. Three patients relapsed and underwent a second curettage combined with fenestration, and the bone at the original tumor site recovered well. During the 12-month follow-up, no tumor recurrence was observed. After the second curettage combined with open surgery, the bone at the original tumor site recovered well. Eight patients underwent dental implants to repair dentition defects one year after surgery.@*Conclusion@#Curettage combined with fenestration is a convenient and effective treatment for jaw classic ameloblastoma.
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Objective@#The purpose of this study was to a new operative approach for sagittal condylar fractures via a preauricular small incision-based technique and to examine the effectiveness of this approach. @*Methods@#Fifteen patients (19 sides) with sagittal condylar fractures were included in the study. The incision length was approximately 4 cm through the tragus, exposing the superficial temporal vessels, which was then pulled forward. Next, the deep temporal superficial fascia was cut, and the surface of the zygomatic arch and the articular capsule of the temporomandibular joint were exposed. Joint capsule incision was performed, with mandibular condylar fracture fixation under direct vision. We followed up with the patients postoperatively for 6 months with clinical and radiographic examinations. @*Results @#All patients had 1 week postoperation before being discharged, during which 2 cases of mild facial paralysis (with lateral temporal level Ⅱ facial paralysis, with lateral temporal branch level Ⅲ facial paralysis and level Ⅱ zygomatic branch of facial nerve paralysis after treatment) were observed, after given nerve nutrition agents, 2 cases returned to normal within 3 months. No patient exhibited a postoperative delayed fistula infection or other serious complications. Intraoperative occlusion relationships recovered well, and postoperative CTs suggested that the fracture ends and condyles were in good condition. The occlusion relationship was normal for 3 months after surgery, with a degree of opening greater than 30 mm, no play in the joints and no oblique openings being observed, and reexamination 6 months after the surgery revealed no obvious scars.@*Conclusion@#This surgical method involves a small incision and clear anatomic structures and avoids damage to the facial nerve. This method provides better surgical vision for treatment of sagittal condylar fractures, is safe and convenient, and deserves clinical recommendation.