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    CORRELATIONS BETWEEN RED BLOOD CELLS’ VARIABLES, CARDIO-PHYSIOLOGICAL AND ANTHROPOLOGICAL VARIABLES IN YOUNG ATHLETES
    (Macedonian Academy of Sciences and Arts / Sciendo, 2020-06)
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    Jadranka Plavsic
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    Aim: The aim of this study was to determine and analyse the relations between anthropometric parameters,red blood cells’ (RBC) variables and cardio-physiological parameters in healthy and physically active children and adolescents. Material and Methods: In this study 625 subjects, (410 males and 215 females; age span 8 to 18 years) underwent body composition analysis (Matiegka method), blood analysis and ergometry testing (Bruce protocol). Results: In both groups, body height and weight were positively correlated with RBC variables. In female group almost all correlations between RBC variables and body components were insignificant. In boys all absolute body mass components showed positive correlations with RBC variables with notice that body fat mass had lowest correlation coefficient. Body fat percent (BF %) did not show any correlation with RBC variables in both gender groups. In boys BF % had moderate negative correlation with aerobic performance: exercise time (ET) and VO2max (rs = -0.41 and rs = -0.39). Lean body components showed weak positive correlations with ET and VO2max. RBC count did not show significant correlation with any cardio-physiological parameter in both groups. Haematocrit and haemoglobin showed weak positive correlations with VO2 max and general endurance (exercise time). In girls all correlations between cardio-physiological and RBC variables were insignificant. The relationship between all body components and all cardio-physiological variables in girls were statistically insignificant. Conclusions: Our findings revealed that there are some expected positive correlations between lean body mass components, aerobic performance and RBC variables in boys, while in girls such relations were not noticed.
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    Bioelectrical Impedance Technology in Sports Anthropometry: Segmental Analysis in Karate Athletes
    (Springer, 2018-09)
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    Dusana Cierna
    The modern equipment for evaluation of body composition use computerized technology to determine or estimate body components. Having a moderate amount of each component is important for healthy life. Quantification of fat has been prime focus of attention, but many coaches, sport scientists and sport physicians working with elite athletes recognize that knowledge of the amount and distribution of lean tissue, such as bone and muscle, can be just as important in determining sports performance. Bioelectrical impedance analysis (BIA) estimates the amount of total body water (TBW), fat free mass (FFM) and fat mass (FM) measuring the resistance of the body as conductor to a very small alternating electrical current. The investigated group was composed of twenty (20) elite level male karate athletes with the following characteristics (mean  SD): age =22.5 3.6 years, age span (18 to 27 years); height = 179.95 2.3 cm; body mass =77.5  9.8 kg. Body composition was diagnosed with the InBody 720, multifrequency (1-1000 kHz) bioelectrical impedance analyzer (BIA). Karate athletes are obliged to maintain their body weight within certain range if they want to stay in optimal weight category. Our results showed that Macedonian karatees have symmetrical and balanced distribution between left and right side of the body. The strongest advantage of BIA methodology and InBody devices, compared to other field methods in sports anthropometry, is the segmental lean mass analysis. Monitoring the segmental analysis could help in following the quality of nutritional and training regime or rehabilitation procedure in athletes.
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    BIOELECTRICAL IMPEDANCE ANALYSIS IN KARATE ATHLETES: BIA PARAMETERS OBTAINED WITH INBODY720 REGARDING THE AGE
    (Faculty of Physical Education, Sport and Health in Skopje, 2016)
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    The basic purpose of this paper is to make recognizable analysis of body composition with bioelectrical impedance analyzer, (especially with InBody 720) to the sports scientific public. To fulfill this assignment we would like to present numerous parameters of body composition obtained with InBody 720, in subjects younger than 18 years and older than 18 years, because of fact that this BIA device gives different final result sheets regarding the age limit of 18 years. We investigated 21 karate athletes, members of karate national team of Republic Macedonia, age span from 15 to 22 years. They were divided in two age different groups, up to 18 (U18) and over 18 years old (18+). The final result sheets for person younger than 18 years consists considerably less parameters than for subjects older than 18 years. Comparison of parameters common for both groups showed that U18 karate athletes had significantly lower mean values for following parameters: height (176.8  4.26cm vs. 179.8  5.35cm), body weight (69.05  7.4 kg vs. 77.43  8.71 kg), skeletal muscle mass (35.38  4.43 kg vs. 38.34  2.97 kg) and body mass index, BMI (21.8  1.31 kg/m2 vs. 23.97  2.26 kg/m2) than 18+ karate athletes. Younger athletes also had significantly lower parameters of obesity diagnose: body fat mass (6.73  1.98 kg vs 10.31  5.02 kg) and body fat percent (9.8  2.65% vs. 12.91  5.14%). The data from this paper could allow the health professionals, sport scientists, sport expert and athletes to get useful information about plenty of parameters of body mass analysis obtained with bioelectrical impedance analyzer.
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    ESTRADIOL: MECHANISM OF CARDIORENAL PROTECTION
    (Faculty of Physical Education, Sport and Health in Skopje, 2017)
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    Premenopausal women have a decreased incidence of cardiovascular disease and a decreased rate of progression of renal disease. With the onset of menopause, however, decreased synthesis of 17β-estradiol (estradiol) is accompanied by an increased incidence of cardiovascular disorders and accelerated progression of renal diseases. The glomerulus and the vascular wall are not static, and components of these structures dynamically increase, decrease, or reorganize in response to physiological and pathological stimuli. Although multiple cellular and biochemical processes are involved in glomerular and vascular remodelling, glomerular mesangial cells (GMCs) in the kidney and smooth muscle cells (VSMC) and endothelial cells in the vasculature are the final common pathway for dynamic changes in glomerular and vascular wall structure. Estradiol may induce protective effects on the renal and cardiovascular system by altering VSMC, GMC, or endothelial cell biology so as to prevent glomerular and vascular remodelling. The purpose of this review is to provide an overview of the participating mechanisms in this regard, as well as the mechanism of estradiol signalling in cardiomyocytes, with an emphasis on mechanisms that might be important in cardioprotection.
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    APPLICATION OF BIOELECTRICAL IMPEDANCE ANALYSIS OF BODY MASS IN ATHLETES
    (College of Sport and Health, Belgrade, 2017-05)
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    The primarily role of body mass analysis in sport anthropometry is to determine body mass components, especially muscle component and body fat. The bioelectric impedance analyzes (BIA) employs the principle that the tissues consist of abundance of water and electrolytes, such as muscles, offer less resistance and conduct the current easier than tissue poor with water, such as adipose tissue. The InBody 720 apparatus utilizes the latest technology of measuring body composition using the method of Direct Segmental Multifrequency Bioelectrical Impedance Analysis. InBody’s use four compartments body mass model: the total body water consists of intracellular (ICW) and extracellular water (ECW); the protein compartment, fat free mass (FFM); the mineral compartment and the body fat mass. The aim of this paper is to show which parameters could be obtained by BIA methodology employing the InBody 720 and to make this methodology familiar and recognizable to health and sport practitioners.
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    LEVELS OF ANXIETY AND DEPRESSION IN ELITE KARATE ATHLETES
    (Faculty of Physical Education, Sport and Health in Skopje, Republic of Macedonia, 2018)
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    The aim of the study was to assess the levels of anxiety and depression, in elite karate athletes on the beginning of the summer preparatory period. The investigation was carried out as part of regular periodical systematic physical check-up of athletes. Twenty nine elite male karate athletes (most of them members of the Macedonian national karate team) aged 15 to 29 years, were asked to fulfil the Beck Anxiety Inventory (BAI) and the Beck Depression Inventory (BDI). The BAI questionnaire consists of 21 questions related to various aspects of anxiety. The intensity of perceived anxiety for every question in BAI is scored from 0 to 3, with 0 representing the least serious and 3 the most serious symptoms. The sum of all items is calculated at the end. BAI scores from 0-7 were ranked as a normal anxiety level; 8-25 as moderate; and 26-63 as high anxiety. The degree of depressive symptoms was measured by the 21-item-revised form of Beck Depression Inventory. The BDI statements for each question are ranked from 0 to 3, with 0 representing the least serious and 3 the most serious symptoms. Scores of BDI ≤ 10 indicate absence of depressive symptoms, BDI scores from 11-20 indicate mild depressive symptoms, while BDI scores from 21-30 indicate moderate depressive symptoms. BDI scores higher than 30 indicate clinically manifest depressive episode. Mean value of the acquired BAI scores in elite karate athletes was 4,1 ± 3,8. One seventh of all athletes showed moderate levels of anxiety. Mean value of acquired BDI scores was 6,1 ± 5,5. Four athletes showed mild depressive symptom, while one athlete showed moderate depressive symptoms. There was a positive correlation between the degree of depressive symptoms and the age of the athletes (r=0,575).
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    ENERGY REGULATION BY DIFFERENT MOLECULES
    (Faculty of Physical Education, Sport and Health, Skopje, Republic of Macedonia, 2022)
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    Abstract Energy homeostasis is regulated by several physiological systems such as endocrine, gastrointestinal, and nervous system, that contribute to maintaining the balance between energy expenditure and energy intake. Food intake as well as food utilization are essential components in the maintenance of energy balance. Exercise is a state that interferes with energy regulation, thus it has a good impact on healthy lifestyle and long lifespan. The aim of the study was to discover the possible role of some energy regulation molecules and their influence during exercise. A number of 37 scientific studies from PubMed, ScienceDirect, MEDLINE, and Scopus databases were examined from the period of the last 20 years, combining the physiological mechanisms relatedto energy regulation molecules. The Cochrane database was used by dividing molecules into different groups: anorexigenic / orexigenic molecules, incretins, adipokines, and myokines, all related to energy regulation and exercise induced metabolic changes. Thus, variety of molecules derived from the adipose tissue (Leptin, Adiponectin, IL-6 – Interleukin-6, TNF-α – tumor necrosis factor α), from the muscle tissue (Irisin, Myostatin), from intestine and gastric cells (YY - pancreatic peptide YY, GLP-1- Glucagon like peptide-1, GIP- Gastric inhibitory peptide, Ghrelin), from liver tissue (FGF-21- Fibroblast growth factor-21), from pancreatic cells (Amylin), and other molecules are being explored. To understand the exercise induced molecule action mechanisms and their interference, may be useful toward new pharmaceutical approaches, related to energy metabolism regulation. Key words: energy homeostasis; physiological mechanisms; exercise.
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    Psychophysiology and the sport science
    (Faculty of Physical Education, Sport and Health in Skopje, 2016)
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    Psychophysiology is an interdisciplinary scientific approach which studies the connection between mind and body through measurement of the electrical activity of neural and muscular tissues and the conductivity of dermal tissue. The aim of this paper is to review some of the findings of psychophysiology research in sports. Two types of methods have been employed. The first one is the measurement of the changes in the brain electrical activity using the electroencephalography (EEG). Event-related potentials (ERP) are modalities of EEG which have largely been used in the research of performance in athletes. The other type of measurements is focused on the changes in cardiovascular system, respiratory system and skeletal muscles. The muscular electrical activity during sports performance has been investigated by electromyography (EMG). Both types of investigations can be combined. Psychophysiological level of measurement holds promise for understanding how cognitive-affective factors influence the quality of motor behavior.
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    BIOELECTRICAL IMPEDANCE ANALYSIS OF BODY COMPOSITION IN KARATE ATHLETES REGARDING THE PREPARATORY PERIOD
    (Paneuropean University, APEIRON, Banja Luka, BiH, 2016-12)
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    Zarko Kostovski
    The aim of the paper was to asses changes in body composition using bioelectrical impedance analysis (BIA) methodology in members of national karate team after teen week preparatory training period. The investigation was carried out on 11 male karate contestants, aged 18 to 28 years mean age (21.82 3.58). The body composition was analyzed with In Body 720. The BIA outcomes were divided in 3 group of variables: body fl uid and body composition variables, obesity diagnose variables and segmental analysis variables. All BIA variables were insignifi cantly higher at second measuring (p>005). Only Body mass index (BMI=24.1 vs 24.55); mineral (4.69 kg vs 4.77 kg) and osseous (3.85 kg vs 3.92 kg), were signifi - cantly higher (p≤0.05) after preparatory period. Body fat mass (BFM=10.34 kg vs 10.75 kg, p=0.329) and body fat percent (BF%= 12.73 vs13.22%) insignifi - cantly increased after preparatory period. The skeletal mass has changed from 40.03kg to 40.55kg (p=0.276). Body composition analysis, changes in weight, BMI and body fl uids are essential for weight categories dependent sports such as karate. Positive changes in body components and in body fl uids suggest that the training process during the preparatory period did not show negative effects on body components and the hydration of the karate athletes.
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    Levels of manifest anxiety in athletes
    (College of Sport and Health, Belgrade, 2017-05)
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    The aim of the study was to assess the levels of manifest anxiety in athletes. One hundred and fifteen athletes (16 females and 99 males) aged 15 to 25 years who were engaged in different team sports and 174 students (132 females and 42 males) aged 19-25 years, from the Medical Faculty in Skopje, who had sedentary life style were asked to anonymously fulfill the Taylor Manifest Anxiety Scale (TMAS), which measures trait anxiety. It is an acquired behavioral disposition to perceive an objectively safe object as threatening and dangerous and respond to it with anxiety, the intensity of which is not adequate to the objective situation. Mean value of the acquired TMAS scores in athletes was 13,07 ± 5,83, while medical students scored 21,65 ± 8,33 (p<0,05) on TMAS. Twenty nine percent of the athletes and 75 percent of medical students showed high levels of manifest anxiety (TMAS score higher than 15). There was no difference in mean TMAS scores between male athletes aged 15 to 18, and athletes aged 19 to 25. Athletes showed significantly lower levels of manifest anxiety compared to sedentary medical students.