Total distance (in meters) covered in 12 min was calculated by multiplying the number of complete laps with 400-m plus the distance covered in the final incomplete lap. The total number of laps was counted and the finishing point was marked. They were highly motivated to run as many laps as possible. Aerobic endurance tests (maximum oxygen uptake capacity (VO 2max ) 12 minute walk-run test protocol Male and female athletes ran on a 400-m round track for a total duration of 12 min. Body fat percentage, fat free mass, basal metabolic rate were obtained by using this device. Assessment of Body Composition In this study, a BC-418 8-contact electrode BIA system (Tanita Corp., Tokyo, Japan) was used to determine body composition. The body mass index (BMI) of each female and male were calculated as weight in kg divided by weight in meters squared. Measures Measurements of Height and Body Weight Body height and weight measurements were made using a digital scale (Seca 664, Hamburg, Germany) in bare feet and wearing only shorts. The study was approved by the local Ethics Committee, and was conducted in a manner consistent with the institutional ethical requirements for human experimentation in accordance with the Declaration of Helsinki. All athletes and parents were notified of the research procedures, requirements, benefits, and risks before giving informed consent. Written informed consent was obtained from all the participants and their parents. Testing was completed for all athletes in the same laboratory and field facilities. The athletes were asked not to participate in a daily training program within 24 hours prior to testing. Material and Methods Participants Twenty five young athletes, 13 male (average age 16.5 ± 2.4 year height 169.7 ± 5.2 cm weight 57.1 ± 5.9 kg training experience 2.4 ± 1.7 years) and 12 female (average age 16.2 ± 2.1 year height 162.5 ± 5.2 cm weight 49.3 ± 8.0 kg training experience 1.4 ± 1.1 years) distance runner, voluntarily participated in this study. It was hypothesized that a higher level of aerobic fitness would be positively associated with FFM and negatively associated with FP. On the other hand, for a better understanding of gender differences in aerobic fitness, the study will be important to understand the interaction of body fat, fat free mass and basal metabolic rate in both boys and girls. The primary purpose of the study was to assess the relationship between body composition and aerobic fitness in boys and girls distance runners. The influence of body composition may be particularly important for sports disciplines in which athletes are required to have an appropriately high aerobic performance together with high muscle mass. Regular exercise is the main cause to improve body composition and cardiovascular fitness. Aerobic fitness is the main factors that enhance human to doing daily jobs and also improve the ability to long time duration exercise. VO 2max refers to the intensity of aerobic process and actually denotes the maximum capacity to transport and utilize oxygen during exercise done at increasing intensity. It is commonly considered the best determiner of cardio respiratory fitness. Introduction In sports achievements, aerobic endurance is an important factor of success. It also demonstrates that lower FP and higher FFM contribute to VO 2max.ġ. FP and FFM were inversely related to aerobic fitness. The VO 2max and FP showed strong negative correlation (r = - 0.77 and -0.76 respectively for both of different tests) and FFM showed moderate correlation (r = 0.48 and 0.44 respectively for both of different tests). The difference in VO 2max and FP was significant between boys and girls athletes. VO 2max was determined by both 12 minute walk-run and Multi stage running tests (MST). The subjects' body fat percentage (FP), free fat mass (FFM) and basal metabolic rate (BMR) were estimated by bioelectrical impedance. Thirteen boys (average age 16.5 ± 2.4) and twelve girls (average age 16.2 ± 2.1 years) totally twenty-five athletes voluntarily participated in the study. The purpose of the study were (a) to assess the maximum oxygen uptake capacity (VO 2max) and body composition in boys and girls distance runners and (b) to determine the relationship between these parameters.
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