The anaerobic endurance of elite soccer players improved after a high-intensity training intervention in the 8-week conditioning program.

The purpose of this study was to evaluate changes in anaerobic endurance in elite First-league soccer players throughout 2 consecutive seasons, in 2 phases, with and without high-intensity situational drills. Eighteen soccer players were tested before and after the 8-week summer conditioning and again in the next season. The measured variables included 300-yard shuttle run test, maximal heart rate, and maximal blood lactate at the end of the test. During the first phase of the study, the traditional sprint training was performed only 2 x weeks and consisted of 15 bouts of straight-line sprinting. In the second year the 4 x 4 min drills at an intensity of 90-95% of HRmax, separated by periods of 3-minute technical drills at 55-65% of HRmax were introduced. Statistical significance was set at P

Morphological differences of elite Croatian soccer players according to the team position.

Team position is of extreme importance in interpretation of morphological data because there are specific demands for a specific play position. The aim of the study was the analysis of morphological characteristics and body composition of elite Croatian soccer players with respect to their team position. The measurements were performed on 57 soccer players, members of the First Croatian National League. The anthropometrical measurement encompassed 13 variables. Descriptive statistics, t-test and MANOVA were used in data processing. The goalkeepers were the tallest and the heaviest (182.9 +/- 4.3 cm; 80.1 +/- 5.1 kg), and had significantly higher amounts of body fat (20.2% goalkeepers vs. 13-15% others; p < 0.05), whereas the forwards and the midfield players were on the average about 3 cm shorter. The goalkeepers had longer legs and arms (p < 0.05), and the largest biacromial diameter (43.2 +/- 1.9 cm). The forwards were the shortest on the average (179.2 +/- 6.3 cm). The lowest values of fat tissue were found in defenders (13.9%) and midfield players (14.4%). In conclusion, the differences in morphological characteristics according to the team position were noticed only in goalkeepers, especially regarding their height, weight and the percentage of fat tissue.

Antiandrogens in hormonal contraception limit muscle strength gain in strength training: comparison study.

AIM: To determine antiandrogen effects on muscle strength gain and fat-free mass increase during exercise in women using hormonal contraception with antiandrogen content. METHODS: The study included 50 women (age range, 18-30 years; mean-/+SD, 26-/+3) using hormonal contraception for at least 12 months before the beginning of the study. They were divided into two groups: "antiandrogen" group (n=26) and "estrogen-progestogen" group (n=24) groups. The subjects participated in strength training sessions 3 times a week during 16 weeks. Initially, there were no differences between the groups in fat-free mass, muscle strength, or maximum oxygen uptake. The parameters were measured before, during, and after the training period. RESULTS: After the training period, the mean increase of fat-free mass was significantly greater in the estrogen-progestogen group (p<0.001). The mean gain in the muscle strength (in Newtons) was also more evident in estrogen-progestogen group (1289.0-/+17.1 N vs 101.9-/+18.5 N; p<0.001). There were no differences in the maximum oxygen consumption (VO(2)max). CONCLUSION: Antiandrogens had a negative effect on muscle strength, minimizing the effects of strength training in women. Hormonal contraception containing antiandrogens should be avoided in young exercising women.