The aim of the study was to determine the daily optimum and the daily pesimum of running speed performance, explosive strength of lower limbs and dynamic strength of upper limbs performance and performance of the shooting precision by the biathlete at the beginning of the preparation period of annual training cycle 2015/2016 (age 30.6, body height 170 cm, body weight 64.6 kg). The diagnostics we carried out in laboratory conditions, for 7 days in three-hour intervals (9 o`clock - 12 o`clock - 15 o`clock - 18 o`clock). Running speed was measured with the device Fitro Light Gates (FiTRONIC, Bratislava, Slovak republic). The criterion for the performance assessment was the running time, achieved over the distance of 30 m with the exactness of 0.01 s. The explosive strength of lower limbs was diagnosed by Myotest (Myotest, Switzerland). The criterion for the performance assessment was the average height of five vertical jumps in cm with the exactness of 0.1 cm. The dynamic strength of upper limbs was diagnosed by the training simulator Concept 2 SkiErg (Morrisville, USA). The criterion for assessing was the achieved power, presented in Watts, with an accuracy of 1 W. The shooting precision was diagnosed by electronic shooting simulator Scatt Professional (Scatt, Russian Federation). The criterion for the level assessment was the total point value of 10 shots with an accuracy of 0.1 point. Performances in shooting were diagnosed separately for shooting in prone and standing positions. In the running test we examined the optimum at 6 PM (5.19 ± 0.04 s) and pesimum at 3 PM (5,36 ± 0,12). In the shooting test we determined the optimum at 12 AM (prone position: 103.1 ± 1.2 points; standing position: 92.0 ± 6.1 points) and the pesimum at 9 AM (prone position: 99,9 ± 4,7 points; standing position: 89,7 ± 2,6 points). In both of tests of strength abilities we determined the optimum at 6 PM (Concept2 SkiErg: 222.1 ± 11.8 W; Myotest: 33.4 ± 1.1 cm) and pesimum at 3 PM (Concept2 SkiErg: 192 ± 13,1 W; Myotest: 32,1 ± 1,4 cm). The statistical analysis was realized by software IBM® SPSS®Statistics V19 (Statistical Package for the Social Sciences) a R Project. Significant differences were noticed in upper limbs strength abilities (Concept 2), where the measured values for power p < 0.05, Kendall ?s W = 0.89, effect size very strong, running time in 30 m, where p < 0.05, Kendall ?s W = 0.48, effect size moderate, vertical jump, where p < 0.05, Kendall ?s W = 0.44, effect size moderate. In shooting skills there weren`t noticed the significant differences among four times during the day.
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