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Evaluation of Aerobic Capacity and Energy Expenditure in Folk Dancers

100%
Maciejczyk M., Feć A.
Human Movement
|
2013
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vol. 14
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issue 1
76-81
EN
Purpose. The aim of the study was to evaluate the aerobic capacity and energy expenditure of folk dancers. Methods. The aerobic capacity (VO2max) of four male and four female folk dancers was measured by an incremental treadmill test and energy expenditure was assessed by the linear relationship between heart rate and oxygen uptake as based on indirect calorimetry. Results. The dancers presented good aerobic capacity (VO2max), with men achieving values of 51.8 ± 7.39 ml ∙ kg-1 and women 43.43 ± 3.81 ml ∙ kg-1. Steady-state heart rate during folk dancing was 167.8 ± 16.68 b ∙ min-1 (85.0% ± 8.68% HRmax) for men and 178.3 ± 5.62 b ∙ min-1 (91.0% ± 3.83% HRmax) for women, with energy expenditure at 14.54 ± 2.09 kcal · min-1 and 10.08 ± 2.03 kcal · min-1, respectively. Conclusions. The exercise intensity performed during folk dancing is close to the threshold of decompensated metabolic acidosis. Folk dancing can be quantified as a difficult (for men) and very difficult (for women) form of physical activity; dancers should be physically well-prepared for the high exercise intensity present in folk dancing.
2
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Influence of Hypoxia Training on the Aerobic Capacity of an Elite Race Walker

81%
Maciejczyk M., Sudoł G., Szyguła Z.
Human Movement
|
2012
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vol. 13
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issue 4
360-366
EN
Purpose. The aim of the study was to evaluate the influence of a combination of two different hypoxic training models (“live high-train high” and “live high-train low” with the use of a hypoxic tent) on the aerobic capacity of a elite race walker preparing for the 2009 IAAF World Championships. Methods. Evaluation of VO2max and the second ventilatory threshold was performed three times: 1) after four weeks training without hypoxic conditions, 2) after 28 days training in normoxia and sleeping for 8 h/day in a hypoxic tent (normobaric hypoxia, simulated hypoxia at 2133 m above sea level) and 3) after 26 days of classical altitude training at a moderate altitude of about 1800 m ASL (hypobaric hypoxia). The hematological parameters of the athlete’s blood (hematocrit, hemoglobin concentration, and erythrocytes and reticulocytes counts) were also measured after each stage. Results. After training in normoxia and sleeping in a hypoxic tent the ventilatory threshold was noted at a higher work intensity and featured an improvement in his hematological parameters, although VO2max was unchanged (compared to training without hypoxia). After classical altitude training a higher level of VO2max was observed (with a ventilatory threshold level similar to the level after training in normobaric hypoxia), but the hematological indices were lower than the levels observed before starting hypoxic training. Conclusions. The combination of two methods of hypoxic training improved the aerobic capacity of the test subject, but an improvement in the analyzed hematological indicators was observed only after LH + TL training. After training in LH + TH these indicators were lower in comparison to the levels prior hypoxic training. The changes in the hematological indices after hypoxic training did not seem to have a significant influence on aerobic capacity; the observed improvements in physical performance may result from other factors.
3
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The changes in running economy during puberty in overweight and normal weight boys

61%
Maciejczyk M., Gradek J., Szymura J., Cempla J., Więcek M., Tota Ł.
Biomedical Human Kinetics
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2015
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vol. 7
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issue 1
EN
Study aim: running economy (RE) is important indicator of endurance performance. During puberty dynamic changes in body composition and function are observed, as such RE is also expected to change. The aim of the study was to compare the running economy (RE) in overweight and normoweight boys during a running exercise performed with constant velocity, and the assessment of changes in RE during puberty. Material and methods: the RE of the subjects was evaluated twice: at the age of 11–12 and two years later. 18 overweight and 17 normal weight boys performed a graded test and a week later a submaximal run on a mechanical treadmill. During the exercise, physiological variables (oxygen uptake, heart rate, pulmonary ventilation, tidal volume and breathing frequency) were measured. Results: the intensity of work in both tests (%VO2max, %HRmax) was significantly higher in the overweight boys and decreased with age (non significantly) in both groups. The physiological response during the run in the overweight boys was significantly higher compared to normal weight. When the oxygen uptake was expressed as VO2.BM–0.75, the RE was similar in normal weight and overweight boys. During puberty, the inter-group differences in the metabolic cost of work stay at a relatively stable level. Conclusions: the lowered endurance performance in the overweight boys during puberty remains unchanged. The changes in physiological variables during puberty in both groups occurred in a similar way – the body composition did not influence the course of these changes in puberty.
4
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Changes in Endurance Performance in Young Athletes During Two Training Seasons

61%
Tota Ł., Maciejczyk M., Pokora I., Cempla J., Pilch W., Pałka T.
Journal of Human Kinetics
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2015
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vol. 49
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issue 1
149-158
EN
The aim of the study was to assess changes in endurance performance in young runners (females and males) during two training seasons. It involved 19 male and 16 female athletes aged 15-17 specializing in track-and-field middle and long distances runs. The following parameters were measured three times during the training season: maximal oxygen uptake, running economy, and the level of the second ventilatory threshold. Training volume and intensity during each season were analyzed within an 8-week period prior to the exercise tests. The volume and intensity of training at various stages of preparation in both seasons were similar. During the first year of observation, significant improvements in relative volume of maximal oxygen uptake were reported both in female and male athletes. During the second training season, it was found that running economy improved both in women and men, with no changes in maximal oxygen uptake. The same (in terms of volume and intensity) endurance training carried out with young runners during two consecutive training seasons can result in different training effects.
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