Profile of young handball players by playing position and determinants of ball throwing velocity

This study defined the differences in physical qualities and anthropometric characteristics among playing positions in young male handball players, and investigated the relationship between ball throwing velocity and all measured parameters.182 young male handball players, aged 14.3yrs, with playing experience of 4.5yrs, were classified as: back players, centre backs, pivots, wing players, and goalkeepers. Body height, body mass, BMI, arm span, hand length, standing long jump, 30m sprint, flexibility, VO2max and throwing velocity were measured.Significant differences were detected among individual positions for all measured variables, except for flexibility. Backs were tallest, while pivots showed the largest arm span and hand length. Wings were shortest, with the lowest weight and BMI. Backs and wings performed best in the standing long jump, 30m sprint, flexibility and VO2max. Goalkeepers underperformed in all motor abilities. Ball velocity significantly correlated to all variables except for BMI and flexibility. Anthropometric and physical differences exist among different positions in young male handball players. These parameters influence ball velocity.The findings suggest that a high performance level requires advanced physical qualities as well as anthropometric features for these ages, and coaches should apply specific training programs for each playing position. © Editorial Committee of Journal of Human Kinetics

Ageotypes revisited: The brain and central nervous system dysfunction as a major nutritional and lifestyle target for healthy aging

Undeniably, biological age can significantly differ between individuals of similar chronological age. Longitudinal, deep multi-omic profiling has recently enabled the identification of individuals with distinct aging phenotypes, termed ‘ageotypes’. This effort has provided a plethora of data and new insights into the diverse molecular mechanisms presumed to drive aging. Translational opportunities stemming from this knowledge continue to evolve, providing an opportunity for the provision of nutritional interventions aiming to decelerate the aging process. In this framework, the contemporary ageotypes classification was revisited via in silico analyses, with the brain and nervous system being identified as the primary targets of age-related biomolecules, acting through inflammatory and metabolic pathways. Nutritional and lifestyle factors affecting these pathways in the brain and central nervous system that could help guide personalized recommendations for the attainment of healthy aging are discussed. © 2023 Elsevier B.V

The rate of lactate removal after maximal exercise: The effect of intensity during active recovery

Aim. The aim of the present investigation was to determine the greater rate of lactate removal after a maximal rowing test using different intensities during active recovery. Methods. Thirty elite male rowers performed a simulated incremental exercise protocol on rowing ergometer to determine their maximal oxygen uptake and they divided into three equal sized group according to the type of the recovery that followed the assessment. The irst group (N.=10) subjected to 20 min of passive recovery, while the second (N.=10) and the third (N.=10) groups performed 20 min of active recovery using the 25% and the 50% of each individual's maximal power output, respectively. During the recovery period, every two min were performed measurements for the assessment of blood lactate, oxygen consumption and heart rate (HR). Results. It was found that after 10 min of active recovery at 50% and 25% of maximal power output lactate concentration reduced by 43% and 15%, respectively, while during passive recovery lactate concentration found to be slightly elevated by 1%. It was also found that during recovery period, HR, oxygen consumption and pulmonary ventilation was signiicant elevated at higher exercise intensity compared to lower exercise intensity and passive recovery. Conclusion. It is concluded that in elite male rowers the active recovery provided higher rate of lactate removal compared to passive recovery. Moreover, active recovery at 50% of maximal power output had better results in lactate clearance compared to the active recovery of lower intensity (25% of maximal power output)

The Prognostic Significance of Serum Glucose Levels After the Onset of Ventricular Arrhythmia on In-Hospital Mortality of Patients with Acute Coronary Syndrome

BACKGROUND: Several studies have illustrated the role played by serum glucose levels in cardiovascular morbidity and mortality in general and, more particularly, after an acute coronary event. AIM: The aim of this study was to evaluate the impact of serum potassium and glucose levels on in-hospital mortality in patients with ischemic heart disease, who exhibited severe ventricular arrhythmia. METHODS: We enrolled 162 consecutive patients who were referred to our institution for an acute coronary event and presented with sustained ventricular tachycardia or ventricular fibrillation during the first 24 hours of hospitalization. Serum potassium and glucose levels were measured in all patients at the onset of tachycardia and after 2, 4, 6, 12, 36, 48 hours. RESULTS: During hospitalization, 23 out of 162 patients died (61% males). Serum glucose levels at the onset of the arrhythmia, as well as after 2, 12, 36 and 48 hours, were higher in the deceased (onset: 228.8 ± 108 vs. 158 ± 68 mg/dl, p = 0.0001, 2 h: 182 ± 109 vs. 149 ± 59 mg/dl, p = 0.03, 12 h: 155.5 ± 72 vs. 128 ± 48 mg/dl, p = 0.025, 36 h: 163.8 ± 63 vs.116 ± 42 mg/dl, p = 0.002, and 48 h: 138 ± 64 vs. 122 ± 42 mg/dl, p = 0.05, respectively), even after adjustment for age, sex, diabetes, left ventricular ejection fraction, type of acute coronary syndrome and site of infarction and medication intake. There was no difference in serum potassium levels between the deceased and survivors. CONCLUSION: Serum glucose levels at the onset of arrhythmia and 2, 36 and 48 hours later seem to have prognostic significance for in-hospital mortality in patients hospitalized for an acute coronary event, who exhibit severe ventricular arrhythmia

Behavioural and endocrine study of Oreochromis aureus, with special reference to sex-reversed males.

Δημοσιεύσεις μελών--Παράρτημα--Τμήμα Τεχνολογίας Αλιείας και Υδατοκαλλιεργειών, 199

Behavioural and endocrine study of Oreochromis aureus, with special reference to sex-reversed males. In Proceedings of the Fifth International Symposium on the Reproductive Physiology of Fish

peer reviewedThe relationship between social status and hormonal profiles (T, E2,11-KT, T3 and 74) was analysed in normal tilapias Oreochromis aureus. Dominant females and dominant males exhibited respectively T and 11-KT plasma level higher than subordinate fish of the same sex.Moreover, the behaviors of females and 17a-ethynylestradiol sex-reversed males (pseudo-females) were studied in mixed pairs or assemblages (4,6 or 8 fish in 500l and 10 fish in 100 l). The results suggested that pseudofemales were more aggressive and dominant that females. Activity rhythms were similar in females and pseudo females

ELNAIS: A collaborative network on aquatic alien species in hellas (Greece)

ELNAIS is a dynamic online information platform aiming to collect and report spatial information on Aquatic Alien Species in Greek waters. It covers freshwater, marine and estuarine waters, including not only established aliens but also casual records and cryptogenic species. The ELNAIS system includes: News, List of Greek experts, Literature of findings in Greece, List of species with information on their first introduction date and source as well as photos and distribution maps. Data providers are the scientific community (publications, grey literature, and databases) as well as citizen scientists. ELNAIS provides a useful tool towards national obligations and commitments under both the European and global frameworks in respect to Non Indigenous Species (CBD, WFD, MSFD). © 2015 The Author(s) and 2015 REABIC