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Heart rate variability during pre-competition and competition periods in volleyball players

100%
Podstawski R., Boraczyński M., Nowosielska-Swadźba D., Zwolińska D.
Biomedical Human Kinetics
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2014
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vol. 6
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issue 1
EN
Study aim: Regular exercise training is thought to modify cardiac autonomic control. One of the body’s responses to training stimuli is heart rate variability (HRV). The use of HRV in the management of sport training is a common practice. The objective of the present study was to assess the impact of the physical activity level on HRV of 1st league national volleyball players prior to and during the competition period. Materials and methods: The study involved 11 players whose HRV was evaluated during the two analysed training periods. Selected indicators of spectral analysis (total power, %VLF, % LF, % HF powers, LF n.u, HF n.u, and LF/HF powers) as well as time analysis (HR, RR, RMSSD, NN50) were assessed on the basis of recordings. Results: The studies conducted in the pre-competition and competition periods showed significant differences in the parameters of spectral VLF% analysis and time NN50 analysis. In the competition period, a significant increase in VLF [%] may be the result of increased psycho-physical arousal, when compared to the pre-competition period. ] Conclusions: Resting bradycardia, assessed on the basis of time analysis indicators, may be the result of internal changes in the sinus node, which reflects the impact of long-term training on the cardiac conduction system. A high level of physical activity of volleyball players in the tested periods could have contributed to a reduction in vagal tone and a shift in the balance of the autonomic nervous system in the direction of the sympathetic system, which may be the result of overtraining
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Factors influencing the performance of young football players in the yo-yo intermittent endurance test (Level 2)

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Brito J., Fernandes L., Seabra A., Rebelo A.
Biomedical Human Kinetics
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2010
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vol. 2
51-53
EN
Study aim: To find out whether the ability to accelerate, decelerate and turn may contribute to the performance of young football players during the Yo-Yo Intermittent Endurance Test - Level 2 (YYIEL2).Material and methods: A group of 239 young male football players from three age categories: under 15 years (U15; n = 102), under 17 years (U17; n = 59) and under 19 years (U19; n = 74) were evaluated in sprint, agility, and intermittent exercise performance. Multiple regression models weighted for maturity status were applied.Results: Significant (p<0.001) differences were found between the U15 and both other groups in all tests. The YYIEL2 was significantly correlated with 5-m and 30-m sprints and agility (r = 0.361, 0.499 and 0.555, respectively; p<0.001) and the latter 3 variables explained 31% (p<0.001) of the total variance of the YYIEL2 performance, the agility test alone being the strongest predictor (b = 0.56; p<0.001).Conclusions: Despite the usefulness of the YYIEL2 test used in football to determine aerobic fitness, other factors than O2max, such as peripheral limitations and the ability to accelerate, decelerate and turn, may influence the performance during the test.
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Effects of creatine supplementation on body mass and muscle girths in bodybuilders

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Jagiełło W., Kruszewski M., Banach J.
Biomedical Human Kinetics
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2010
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vol. 2
47-50
EN
Study aim: To find out whether a 6-week creatine supplementation would significantly augment body mass and muscle circumferences in male bodybuilders.Material and methods: A group of 14 male bodybuilders aged 16 - 29 years were randomly divided into two groups: experimental (E) and control (C), 7 subjects each. Group E received creatine monohydrate, Group C - placebo, 10 g daily for 6 weeks without saturation phase. The experimental design was a double-blind one. All subjects were on strictly controlled diet, the daily intakes amounting to 2.3 - 2.8 g of protein, 1.0 - 1.2 g of fat and 5 - 6 g/kg body mass of carbohydrate, and 3200 - 4000 kcal. All subjects trained 3 days a week, each session lasting 120 min, in the ‘Power, Rep-Range, Shock’ mode. Chest, waist, arm, forearm, thigh and calf girths were measured in the relaxed and contracted states, together with body mass, before and after the study.Results: Significant, training-induced changes were noted in almost all body circumferences studied in both groups and muscle states, those in the chest, biceps and thigh girths being the most pronounced ones and significantly (p<0.05) greater in the experimental than in control group in the contracted muscle state. In the relaxed state the between-group differences were significant for the chest and thigh girths. The increments in body mass were significantly (p<0.01) higher in the experimental than in control group (4.3 ± 1.3 and 2.1 ± 0.7 kg, respectively).Conclusions: The observed changes may have been brought about by creatine administration.
4
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Postural variables in girls practicing volleyball

100%
Grabara M., Hadzik A.
Biomedical Human Kinetics
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2009
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vol. 1
67-71
EN
Study aim: To assess body posture of young female volleyball players in relation to their untrained mates.Material and methods: A group of 42 volleyball players and another of 43 untrained girls, all aged 13 - 16 years were studied with respect to their body posture indices by using computer posturography. Spinal angles and curvatures were measured, and asymmetry and body posture type were assessed. Body height and mass, BMI and body fat content (by bioimpedance technique) were determined.Results: As compared with untrained girls, the volleyball players were more slender, the positions of shoulders and pelvis being more symmetrical, and shoulder blades and waist triangles were more asymmetrical. Volleyball players were predominantly kyphotic, their lumbar lordosis was flattened and head protruded, especially in those having longer training experience.Conclusions: The observed asymmetries brought about by unilateral training loads and progressing thoracic kyphosis call for applying corrective and/or yoga exercises to adolescent female volleyball players.
5
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Anaerobic endurance of young swimmers aged 12 years

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Stachowicz M., Milde K., Janik M.
Biomedical Human Kinetics
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2011
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vol. 3
87-90
EN
Study aim: To assess the effects of swimming training on anaerobic endurance, swimming velocity and chest girth in children aged 12 years.Material and methods: Two groups of children aged 12 years were studied. Group S (14 boys and 6 girls) training swimming at a sport-oriented school 3 days a week, 90 min per session, and Group R (6 boys and 6 girls) engaged in competitive swimming for 4 years. Children from Group S were subjected twice (in September and in February) to a swimming test consisting of 6 bouts of swimming the 12.5-m distance, spaced by 30-s intermissions. Mean and maximum swimming velocities in the entire test were recorded together with their ratio (Performance Index, PI). In children from Group R the swimming velocity at one 12.5-distance was recorded.Results: Apart from somatic indices, significant increases over the 5-month training period were noted in mean swimming velocity in boys and girls (p<0.001) and in maximum velocity in boys (p<0.01). No significant changes were noted in the performance index or in heart rate.Conclusions: Performance index as a measure of anaerobic endurance may serve as a useful tool in assessing the adaptive performance changes in young swimmers.
6
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Postural variables in girls practicing sport gymnastics

100%
Grabara M.
Biomedical Human Kinetics
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2010
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vol. 2
74-77
EN
Study aim: To assess body posture variables in girls practicing sport gymnastics vs. their untrained mates.Material and methods: Two groups of girls aged 7 - 11 years were studied: 48 young female gymnasts (Group SG) and 54 untrained girls (Group C) of comparable age, body height and BMI. The gymnast girls had 3 - 7 training sessions a week, their training experience ranging 1 - 5 years. Body posture was assessed by photogrammetry.Results: Shoulder blades and pelvis were significantly (p<0.05) more symmetrical in gymnast girls than in the control group and their spine was better shaped in the youngest gymnasts (p<0.01). Gymnast girls were significantly (p<0.01) superior to their untrained mates in overall posture rating, Lumbar lordosis was less expressed (p<0.05) in gymnast girls aged 7 - 10 years than in the control ones.Conclusions: Sport gymnastics practiced at young age may affect posturogenesis bringing about body symmetrisation and shaping spine curvatures, especially lumbar lordosis.
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Differences in anthropometric, motoric and cognitive abilities between athletically trained and untrained girls

88%
Iadreev V., Cherkashin I., Vujkov S., Drid P.
Biomedical Human Kinetics
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2015
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vol. 7
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issue 1
EN
Study aim: the aim of the study was to identify differences between athletically trained and untrained subjects with respect to body composition, motor and cognitive abilities. Materials and methods: three groups of girls aged 12 to 14 years old participated in the study: young judokas (n = 42), volleyball players (n = 54) and their untrained peers (n = 54). Variables of interest were assessed through eight motor tests, nine anthropometric variables and the RSPM. Results: this study showed differences in some anthropometric characteristics and almost all motoric abilities between trained girls and untrained girls (p < 0.05), indicating that well-programmed activity can positively influence these characteristics and abilities. In addition, group of volleyball players presented significantly better results in cognitive abilities (p < 0.01), indicating a need for intelligence in complex sports like volleyball. Conclusions: generally, the trained groups of athletes possessed better coordination and strength than their untrained counterparts.
8
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The resting salivary antimicrobial proteins and cortisol concentration in wrestlers during 12-week training

75%
Trochimiak T., Hübner-Woźniak E., Tomaszewski P.
Biomedical Human Kinetics
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2015
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vol. 7
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issue 1
EN
Study aim: the aim of the present study was to investigate the effect of 12-week training on saliva immunoendocrine response in collegiate male and female wrestlers. Material and methods: the control group was composed of men and women of the same age, not engaged in any sports activity except for physical education classes at the university. The examined athletes participated in a 12-week training program, which consisted of two sub-phases (preparatory period and competitive period). Saliva samples were collected at three time points: at the beginning (the first point), after six weeks of the preparatory period (the second point, which was the start of the competitive period) and after six weeks of the competitive period (the third point). Immunoglobulin A and cortisol concentration, and α-amylase activity were measured in saliva by respective ELISA kits. Immunoglobulin A was expressed as relative to total protein concentration (sIgA/total protein). Results: at the third time point, the sIgA/total protein ratio was significantly lower in female compared to male athletes. α-Amylase activity was lower in all examined athletes at all three time points compared to respective control groups. Conclusions: hormonal and mucosal antimicrobial system response can provide helpful information of body adaptive processes to physical strain as well as indicators of magnitude of training-induced stress.
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