Alternation of indicators of lactate and vegetative systems during heightening of load. Purpose of the investigation was to compare alternation of vegetative systems indicators and blood lactate concentrations and during iterative load heightening. Tasks of the investigation: to compare alternation of vegetative systems indicators during replacement and recovery under different loads in respect of lactate threshold. Eight young healthy males took part in the investigation. Average age of subjects was 21,7 years. Investigation was carried out in Laboratory of Sports Physiology of Lithuania Physical Education Academy. Every subjects has undergone two different investigations: working with veloergometer. One –interval increasing load (3 min of work and 3 min of rest), mill-pedalling frequency – 70 times per minute; the other one – continuous increasing load until subject’s inability to maintain required pedalling frequency. The first load was 70 W. Capillary blood sampling was done from finger at the end of the third min of each load during interval test. While doing continuous increasing load subjects after the warming-up (5 min of work with 50 W of capacity) with the help of the veloergemeter produced continuous load that was heightened by 21 W every minute. Wheeling frequency was 70 times per minute. Starting load was 70 W. Load was continuously heightened until the fatigue, i.e. until the subject was able to take a new load for one minute. During the whole investigation and... [to full text]

Purpose: The aim of this study was to determine the influence of 30min. of moderate and heavy intensity aerobic exercise to heart rate during interval incremental exercise. Methods: Eight healthy males (mean SD 23 1yr; 76 4,8 kg; 178 6,6 cm) were tested 3 times. They performed incremental veloergometer exercise test until subjective exhaustion. Pedalling rate was maintained constant at 70 rpm. Test began with 4 min. of cycling at 25 W. Then the workload was increased by 25 W and maintained for 3 min. until participant ,s heart rate (HR) reached 90 % of HRmax (220 - age, year). Between workloads the participants rested for 4 min. Two times exercise was preceded by 30 min. of moderate (equal to lactate threshold), heavy intensity (50 W heavier than lactate threshold) or no warm-up. Capillary blood samples were drawn from finger to measure lactate concentration at rest and 5, 10, 20, 30, min. during work. HR was registered before exercise and every 5 min. during work. Also HR was recorded every 5 s. during interval incremental veloergometer test. The heart rate data were modelled using single exponential models, which included amplitudes, time constants and asimptotics values. Results: Heart rate was more elevated during heavy warm-up compared to the moderate (3 min. – 140 13,7; 13 min. – 158 16,1; 23 min. – 164 13,6; 26 min. - 167 13,7 and 3 min. – 128 8,7; 13 min. – 134 11,2; 23 min. – 140 11,2; 26 min. – 142 10,9 beats/min. respectively). Heavy warm-up resulted... [to full text]