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Biology of Sport

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https://www.readbyqxmd.com/read/29158621/loaded-and-unloaded-jump-performance-of-top-level-volleyball-players-from-different-age-categories
#1
Katia Kitamura, Lucas Adriano Pereira, Ronaldo Kobal, Cesar Cavinato Cal Abad, Ronaldo Finotti, Fábio Yuzo Nakamura, Irineu Loturco
The aim of this study was to investigate the differences in loaded and unloaded jump performances between different age categories of top-level volleyball players from the same club. Forty-three volleyball players were divided into four age groups: under-17, under-19, under-21 and professional. Vertical jumping height for squat jump (SJ), countermovement jump (CMJ) and CMJ with arm swing (CMJa) and mean propulsive velocity (MPV) in the loaded jump squat exercise with 40% of the athlete's body mass were compared among the different age categories, considering body mass as a covariate...
September 2017: Biology of Sport
https://www.readbyqxmd.com/read/29158620/evaluation-of-different-jumping-tests-in-defining-position-specific-and-performance-level-differences-in-high-level-basketball-players
#2
Miran Pehar, Damir Sekulic, Nedim Sisic, Miodrag Spasic, Ognjen Uljevic, Ante Krolo, Zoran Milanovic, Tine Sattler
The importance of jumping ability in basketball is well known, but there is an evident lack of studies that have examined different jumping testing protocols in basketball players at advanced levels. The aim of this study was to assess the applicability of different tests of jumping capacity in identifying differences between (i) playing position and (ii) competitive levels of professional players. Participants were 110 male professional basketball players (height: 194.92±8.09 cm; body mass: 89.33±10.91 kg; 21...
September 2017: Biology of Sport
https://www.readbyqxmd.com/read/29158619/the-effect-of-mineral-based-alkaline-water-on-hydration-status-and-the-metabolic-response-to-short-term-anaerobic-exercise
#3
Jakub Chycki, Tomasz Zając, Adam Maszczyk, Anna Kurylas
Previously it was demonstrated that mineralization and alkalization properties of mineral water are important factors influencing acid-base balance and hydration in athletes. The purpose of this study was to investigate the effects of drinking different types of water on urine pH, specific urine gravity, and post-exercise lactate utilization in response to strenuous exercise. Thirty-six male soccer players were divided into three intervention groups, consuming around 4.0 l/day of different types of water for 7 days: HM (n=12; highly mineralized water), LM (n=12; low mineralized water), and CON (n=12; table water)...
September 2017: Biology of Sport
https://www.readbyqxmd.com/read/29158618/injury-and-illness-epidemiology-in-soccer-effects-of-global-geographical-differences-a-call-for-standardized-and-consistent-research-studies
#4
REVIEW
Cristiano Eirale, Scott Gillogly, Gurcharan Singh, Karim Chamari
Soccer is the most popular sport in the world. While injuries and illnesses can affect the players' health and performance, they can also have a major economic impact on teams. Moreover, several studies have shown the favourable association between higher player availability and team success. Therefore, injury prevention could directly impact clubs' financial balance and teams' performance via increased player availability. To be able to develop effective methods of injury prevention, it is vital to first determine the scope and the degree of the problem: the mechanisms and types of injuries, their frequency and severity, etc...
September 2017: Biology of Sport
https://www.readbyqxmd.com/read/29158617/pertussis-outbreak-in-polish-shooters-with-adverse-event-analysis
#5
Monika Skrzypiec-Spring, Jarosław Krzywański, Monika Karlikowska-Skwarnik, Andrzej Pokrywka, Hubert Krysztofiak, Aneta Nitsch-Osuch, Ernest Kuchar
In addition to different injuries, infections are the most common reason for giving up training altogether or reducing its volume and intensity, as well as a lack of opportunities to participate in sports competitions. Nowadays, a slow but constant re-emergence of pertussis, especially among teenagers and young adults, including athletes, can be observed. This paper describes an outbreak of pertussis among professional Polish shooters, focusing on the transmission of Bordetella pertussis infection between members of the national team, its influence on performance capacity and adverse event analysis...
September 2017: Biology of Sport
https://www.readbyqxmd.com/read/29158616/validation-of-the-vert-wearable-jump-monitor-device-in-elite-youth-volleyball-players
#6
Thiago O Borges, Alexandre Moreira, Renato Bacchi, Ronaldo L Finotti, Mayara Ramos, Charles R Lopes, Marcelo S Aoki
This technical report aims to determine the validity and the accuracy of the VERT Wearable Jump Monitor. The participants of this study were all experienced volleyball players from the U18 category from the Brazilian National team. To assess jump performance, the VERT scores were compared to the VERTEC (jump and reach device). Each athlete performed 3 attack and 3 block jumps in a random, counterbalanced order, and the average score was registered. In the attack jumps, the VERTEC and VERT mean ± SD scores were 70...
September 2017: Biology of Sport
https://www.readbyqxmd.com/read/29158615/using-lactate-threshold-to-predict-5-km-treadmill-running-performance-in-veteran-athletes
#7
Jacky Forsyth, Dean Burt, Fiona Ridley, Christopher Mann
Measuring lactate threshold to predict endurance performance is difficult among veteran athletes, due to age-related decreases in net lactate concentration. The objective of this study was to determine whether lactate threshold, as assessed using the maximal deviation method (Dmax), which is not dependent on net values of lactate, could be used as a more valid measure of 5-km treadmill running performance than other methods of determining lactate threshold. Veteran runners (18 male and 18 female, aged 47.3±6...
September 2017: Biology of Sport
https://www.readbyqxmd.com/read/29158614/evaluation-of-the-external-and-internal-workload-in-female-futsal-players
#8
Marco Beato, Giuseppe Coratella, Federico Schena, Andrew T Hulton
Match analysis technology has been extensively used in football, but there is limited literature on its use in futsal. Despite its increased popularity, the female futsal game model has never been quantified. The aim of this study was to quantify locomotor and mechanical activities performed during a non-competitive female futsal match, measuring the differences between the first and second half. Sixteen female futsal players of the Italian 2(nd) division were enrolled (age 27±5 years, height 1.65±0.09 m, body weight 56...
September 2017: Biology of Sport
https://www.readbyqxmd.com/read/29158613/blood-pressure-heart-rate-and-perceived-enjoyment-after-small-sided-soccer-games-and-repeated-sprint-in-untrained-healthy-adolescents
#9
Amri Hammami, Sofien Kasmi, Paulo Farinatti, Taieb Fgiri, Karim Chamari, Ezdine Bouhlel
The purpose of this study was to examine systolic (SBP) and diastolic blood pressure (DBP), heart rate (HR), rating of perceived exertion (RPE) and perceived enjoyment responses to a repeated-sprint training session (RST) compared to a small-sided soccer game session (SSG) in untrained adolescents. Twelve healthy post-pubertal adolescent males (age 15.8±0.6 years, body mass 59.1±3.7 kg, height 1.7±0.1m) performed RST and SSG sessions in a randomized and counterbalanced order. Blood pressure and HR were measured at rest and at 10, 20 and 30 minutes after interventions, and RPE and enjoyment were assessed...
September 2017: Biology of Sport
https://www.readbyqxmd.com/read/28566815/training-induced-changes-in-physical-performance-can-be-achieved-without-body-mass-reduction-after-eight-week-of-strength-and-injury-prevention-oriented-programme-in-volleyball-female-players
#10
M Lehnert, M Sigmund, P Lipinska, R Vařeková, M Hroch, Z Xaverová, P Stastny, P Háp, P Zmijewski
The purpose of the study was to analyse the changes in muscle strength, power, and somatic parameters in elite volleyball players after a specific pre-season training programme aimed at improving jumping and strength performance and injury prevention. Twelve junior female volleyball players participated in an 8-week training programme. Anthropometric characteristics, isokinetic peak torque (PT) single-joint knee flexion (H) and extension (Q) at 60º/s and 180º/s, counter movement jump (CMJ), squat jump (SJ), and reactive strength index (RSI) were measured before and after intervention...
June 2017: Biology of Sport
https://www.readbyqxmd.com/read/28566814/endocrine-responses-and-acute-mtor-pathway-phosphorylation-to-resistance-exercise-with-leucine-and-whey
#11
M T Lane, T J Herda, A C Fry, M A Cooper, M J Andre, P M Gallagher
Leucine ingestion reportedly activates the mTOR pathway in skeletal muscle, contributing to a hypertrophy response. The purpose of the study was to compare the post-resistance exercise effects of leucine and whey protein supplementation on endocrine responses and muscle mTOR pathway phosphorylation. On visit 1, subjects (X±SD; n=20; age=27.8±2.8yrs) provided baseline blood samples for analysis of cortisol, glucose and insulin; a muscle biopsy of the vastus lateralis muscle to assess mTOR signaling pathway phosphorylation; and were tested for maximum strength on the leg press and leg extension exercises...
June 2017: Biology of Sport
https://www.readbyqxmd.com/read/28566813/kickboxing-review-anthropometric-psychophysiological-and-activity-profiles-and-injury-epidemiology
#12
REVIEW
M Slimani, H Chaabene, B Miarka, E Franchini, K Chamari, F Cheour
Kickboxing is one of the modern combat sports. The psychophysiological demands of a kickboxing competition require athletes to achieve high thresholds of several aspects of physical fitness. The aim of the current review is to critically analyse and appraise the kickboxer's anthropometric, physiological, physical and psychological attributes with the activity profile and injury epidemiology in order to provide practical recommendations for training as well as new areas of scientific research. The available information shows that both amateur and elite-level male kickboxers are characterized by a higher proportion of mesomorphy with a well-developed muscle mass and low body fat percentage...
June 2017: Biology of Sport
https://www.readbyqxmd.com/read/28566812/determinants-of-the-effectiveness-of-fast-break-actions-in-elite-and-sub-elite-italian-men-s-basketball-games
#13
D Conte, T G Favero, M Niederhausen, L Capranica, A Tessitore
The aim of this study was to examine the determinants of successful and unsuccessful fast-break (FB) actions in elite and sub-elite basketball games. Fifteen 1(st)-division (elite) and fifteen 3(rd)-division (sub-elite) Italian men's championship games were analysed across two seasons (2012/2013 and 2013/2014). A binary logistic regression analysis was performed, and the fast-break outcome (successful vs. unsuccessful) was adopted as the dependent variable separately in both elite and sub-elite games. FB execution (initiation, advance and completion phases), typology (primary and secondary break) and the number of players involved (equal number or superiority) were used as independent variables...
June 2017: Biology of Sport
https://www.readbyqxmd.com/read/28566811/the-effect-of-combined-supplementation-of-carbohydrates-and-creatine-on-anaerobic-performance
#14
A S Theodorou, G Paradisis, E Smpokos, A Chatzinikolaou, I Fatouros, Rfgj King, C B Cooke
The purpose of the study was to examine the effect of creatine (Cr) supplementation on anaerobic performance when ingesting creatine and carbohydrates (CHO) together. Twenty male physical education students comprised the two experimental (CR and CRCHO) and one control (CON) groups of the study. All groups performed three 30 s anaerobic Wingate tests (AWTs) interspersed with 6 minutes of recovery. The CR group (n = 7) ingested 5 g of Cr 5 times per day for 4 days. Subjects in the CRCHO group (n = 6) ingested the same quantity but additionally after each 5 g dose of Cr consumed 500 ml of a commercially available energy drink containing 100 g of simple sugars...
June 2017: Biology of Sport
https://www.readbyqxmd.com/read/28566810/soccer-small-sided-games-in-young-players-rule-modification-to-induce-higher-physiological-responses
#15
J Halouani, H Chtourou, A Dellal, A Chaouachi, K Chamari
The aim of this study was to identify the physiological responses of 3 forms of players' numbers during two different games rules of small-sided games (SSG: stop-ball vs. small-goals rules). Eighteen youth amateur soccer players (age 13.5±0.7 years; height 168.9±6.1cm; body mass 63.1±7.7 kg) participated in this study and performed 3 SSGs with varying players' number (2vs.2; 3vs.3 and 4vs.4): stop-ball SSG (SB-SSG) vs. small-goals SSG (SG-SSG) in a randomized and counter-balanced order on a constant pitch dimension (20×25m)...
June 2017: Biology of Sport
https://www.readbyqxmd.com/read/28566809/the-effects-of-game-types-on-intensity-of-small-sided-games-among-pre-adolescent-youth-football-players
#16
J Halouani, H Chtourou, A Dellal, A Chaouachi, K Chamari
The aim of this study was to examine the effects of variations in pitch dimensions on pre-adolescent youth soccer players' physiological responses during two different types of small-sided games (SSG). Sixteen young soccer players (age: 13.2 ± 0.6 years; body mass: 52.5 ± 7 kg; height: 163.4 ± 6 cm) participated in this study. They performed 4 vs. 4 stop-ball SSG (SB-SSG) vs. small-goals SSG (SG-SSG) with 4×4 min and 2 min of passive recovery in between, using 3 different pitch sizes (small: 10×15, medium: 15×20, and large: 20×25 m)...
June 2017: Biology of Sport
https://www.readbyqxmd.com/read/28566808/in-season-training-periodization-of-professional-soccer-players
#17
A Los Arcos, A Mendez-Villanueva, R Martínez-Santos
The aim of this study was to quantify the seasonal perceived respiratory and muscular training loads (i.e., sRPEres-TL and sRPEmus-TL) completed by elite-oriented young professional soccer players. Twenty-four players (20.3 ± 2.0 years) belonging to the same reserve team of a Spanish La Liga club participated in this study. Only the players that were available to train for a whole week with the team and also to play the weekly game were considered: Starters, players that participated in the match for at least 45 min and Non-Starters, players that did not participate or played less than 45 minutes in the match...
June 2017: Biology of Sport
https://www.readbyqxmd.com/read/28566807/specific-physical-trainability-in-elite-young-soccer-players-efficiency-over-6-weeks-in-season-training
#18
M Chtara, M Rouissi, M Haddad, H Chtara, A Chaalali, A Owen, K Chamari
The aim of the present study was to compare the effects of 3 training protocols (plyometric [PLYO], agility [AG], or repeated shuttle sprints [RS]) on physical performance in the same population of young soccer players. Forty-two youth-level male players (13.6±0.3-years; 1.65±0.07 m; 54.1±6.5 kg; body fat: 12.8±2.6%) participated in a short-term (6-week) randomized parallel fully controlled training study (pre-to-post measurements): PLYO group, n=10; AG group, n=10; RS group, n=12; and control group [CON] n=10...
June 2017: Biology of Sport
https://www.readbyqxmd.com/read/28566806/the-effect-of-the-training-with-the-different-combinations-of-frequency-and-peak-to-peak-vibration-displacement-of-whole-body-vibration-on-the-strength-of-knee-flexors-and-extensors
#19
M Stania, P Król, G Sobota, A Polak, B Bacik, G Juras
Whole-body vibration training has become a popular method used in sports and physiotherapy. The study aimed to evaluate the effect of different vibration frequency and peak-to-peak displacement combinations on men knee flexors and extensors strength in isokinetic conditions. The sample consisted of 49 male subjects randomly allocated to seven comparative groups, six of which exercised on a vibration platform with parameters set individually for the groups. The experimental groups were exposed to vibrations 3 times a week for 4 weeks...
June 2017: Biology of Sport
https://www.readbyqxmd.com/read/28566805/association-of-arch-height-with-ankle-muscle-strength-and-physical-performance-in-adult-men
#20
X Zhao, T Tsujimoto, B Kim, K Tanaka
Differences in arch height may have a certain impact on lower extremity muscle strength and physical performance. However, there is little evidence from investigation of the possible correlation of arch height with ankle muscle strength and physical performance measures. Sixty-seven participants took part in this study. Arch height index (AHI) was assessed and categorized using a 3-dimension foot scanner. Ankle muscle strength was measured employing a dynamometer. Physical performance measures including agility, force and proprioception were randomly tested...
June 2017: Biology of Sport
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