Background: Muscle explosive power as a component of physical fitness is an important factor that supports athletic performance in most sports. jump height and vertical jump performance in assessing explosive muscle power are influenced by various factors, including physiological, biomechanical, and anthropometric factors. Body mass index, muscle mass, and fat mass are important anthropometric factors in supporting jumping performance.Objective: To analyze the relationship between body mass index and muscle mass with legs muscle explosive power in first-year medical students of Diponegoro University.Methods: This study is an observational analytic study with a cross-sectional design. The subjects consist of 60 males and 108 females in first-year medical students of Diponegoro University who met the criteria. Body mass index and muscle mass were measured by Omron bioelectrical impedance analyzer, and muscle explosive power was measured by vertical jump test. Data were analyzed with the Kolmogorov Smirnov normality test and Spearman correlation test.Results: The average value of body mass index was 21.760±2.7734, muscle mass was 29.468±4.3283, and muscle explosive power was 29.468±4.3283. Muscle mass was positively correlated with legs muscle explosive power (p=0.00, R= 0.583) and negatively correlated between body mass index and legs muscle explosive power but it was not statistically significant (p=0.823 dan R=- 0.017) in first-year medical students of Diponegoro University.Conclusion: Muscle mass was positively correlated with legs muscle explosive power and body mass index showed no significant correlation with muscle explosive power. Keywords: body mass index, muscle explosive power, muscle mass, vertical jump test

Introduction : Strength is the ability to excert force, which can resist external resistance and its purpose as a basis for human movements. Strength also can be a standard for measuring someone’s performance. Plyometrics training known as an exercise that can increased muscle strength. Great muscle strength can lead to great muscle endurance so that the person will become healthier and will not get tired easily. However, there’s still no further study that measured leg muscle strenght on medical students after given plyometrics training treatment. Methods : Intervention of the study was plyometrics training for 6 weeks. This study was a quasi-experimental with pre-test (before training), middle-test (after four weeks training), and post-test (after six weeks training). The subjects were 28 (15 to 25-year old) male medical students of Diponegoro University divided into 2 groups with 14 samples for each group: control group and treatment group. Muscle strength were measured by leg dynamometer. The results were analyzed using SPSS. Results : The muscle strength which measured by leg dynamometer improved among subjects who did plyometrics training. The significant results (P = <0,05) found on middle-test and post-test proved that plyometrics training affects the enhancement of leg muscle strength. Conclusions : Plyometrics training for 6 weeks proved to increase leg muscle strength of medical students in Diponegoro University.Keywords: Plyometrics Training, Strength, Leg Dynamometer

Background: Hyperuricemia is an abnormally high level of uric acid in the blood. Ginger and lime are natural ingredients that contain antioxidants and anti-inflammatory which could reduce blood uric acid levels. This study aims to prove the effect of red ginger powder and lime juice combination on uric acid levels of Wistar rats induced hyperuricemia.Methods: Experimental research with pre and post-test only control group design. Thirty Wistar male rats, aged 2-3 months, weighed 150-350 grams randomly divided into 5 groups. Group C1 was normal control group. Group C2 was induced by single intraperitoneal injection of potassium oxonate (300mg/kgBW). Group T1, T2, T3 were induced by potassium oxonate and orally administered by combination of red ginger powder (300, 600, 1200 mg/200gBW) and lime juice (2ml/150gBW). Blood samples in each group will be collected in 1 hour after treatment. Uric acid levels were measured using the TBHBA uric acid method.Results: Uric acid level in T1, T2, and T3 group was significantly lower than C2 group (p<0,05). The most effective dose to reduce uric acid levels was 1200mg/200gBW red ginger in combination with 2ml/150gBW lime juice (T3 group).Conclusion: Red ginger powder and lime juice may reduce the blood uric acid levels in Wistar rats induced hyperuricemia.