Aim: This study aimed to  investigate the effect of two weeks of vitamin D3 supplementation on some indices of Delayed Onset of Muscle Soreness (DOMS) after  eccentric exercise.
Method and Materials: In this semi experimental study, 20 nonathletic male collegiate students (19.75±1.29 years) participated in the study voluntarily and were divided randomly into two groups of experimental (n=11) and placebo (n=9). The experimental group consumed vitamin D3 (Cholecalciferol) containing 50000 IU while the placebo group took apparently similar capsules containing starch like, two capsules for two weeks. To induce DOMS, participants performed a step protocol that included four sets (5 minutes for each set), with a 1-minute of rest interval between each set using a 46 cm-step. Range of Motion (ROM) of low extremity joints and circumferences, and Visual Analog Scale (VAS were measured before, immediately after (Time 0), and 24 hours (Time 1) and 48 hours (Time 2) after eccentric exercises.
Findings: This study showed that thigh Thigh circumference increased following eccentric exercise in the placebo group, while it did not change significantly in the experimental group (p>0.05). There was no significant difference between the two study groups regarding other variables (P>0.05). Vitamin D3 supplementation with the dosage and duration used in the present study reduced the limited symptoms of DOMS. Future studies of longer duration or higher dosage of vitamin D supplementation are recommended.  
Conclusions: According to the finding of this study, vitamin D3 supplementation could not reduce the limited symptoms significantly. However, future studies are suggested to evaluate the effect of higher dose or longer duration of vitamin D supplementation on DOMS.

Aims: Childhood obesity is one of the leading causes of various musculoskeletal problems and health-related issues among school-going children. Regular sporting activity helps to maintain physical fitness. To compare the effects of physical activity on Body Mass Index (BMI) and cardiovascular endurance among the students of the sporting school and general school.
Method and Materials: This pilot study was conducted among the students of the sporting school and general school from a selected area of Bangladesh. A total of 20 participants (10 from sporting schools and 10 from general schools) both males and females took part in this study. Anthropometric measurement was taken after getting consent from the participants. The Havard Step Test was used to collect data. Descriptive statistics and an independent t-test were used to compare the data. The p value was set at <0.05 as the level of significance.
Findings: The mean age, height, weight, and BMI of the participants in the sporting group were 16.37±1.04 years, 117.72±12.01 cm, 64.25±25 kg, and 19.93±1.10 kg/m² and in the non-sporting group were 14.65±0.93 years, 105.22±14.42 cm, 61.23±2.19 kg, and 19.64±2.27 kg/m2 respectively. There was no significant difference in BMI  (p= 0.412) but cardiovascular endurance (p=0.026) showed a significant difference among sporting school and non-sporting school children.
Conclusion: Though females in sporting schools have a high level of cardiovascular endurance results of both groups are not as expected. The study strongly recommended that every school should arrange competitive games at least once a week for their students.