Christos Galazoulas

Aristotle University of Thessaloniki | AUTH · School of Physical Education and Sports Science

Drop jump (DJ) performance gain with increasing drop height is well documented in adults, but there is still no clear evidence of such gain in children. This study aimed to examine the differences in DJ performance gain in male adults and prepubescent boys by comparing drop heights tailored to each individual's performance and expressed as a percen...

Pick and roll actions have become one of the most frequently used offensive cooperations in youth basketball games. The purpose of this study was to evaluate the variables of performance time of the pick and roll every five minutes, the pair of players who participated in the pick and roll and the offensive action of the ball handler after the scre...

The evolution of basketball made the game faster, leading coaches to increase the use of pick and roll cooperation in offense. The purpose of this research was to investigate the performance time of the pick and roll every five minutes, the pair of players who participated in the pick and roll and the offensive action of the ball handler after the...

Ball screens are the most frequently used offensive tactic in basketball. A performance analysis wasperformed to examine this offensive strategy in combination with different defensive actions. The purpose of this study was to examine the exploitation speed of Pick and Roll (PnR) in mismatches created by defensive switch. The study sample consisted...

The offensive rebound (OR) is particularly important because it offers a second opportunity to score against a misplaced defense, and it is a performance indicator that distinguishes the winning teams in playoff games. This research was conducted to investigate the effectiveness of offensive plays following an offensive rebound, both from winners a...

Purpose The purpose of this study was to examine the acute effects of 40-Hz upper-body vibration at two different amplitudes, added to the warm-up process, on throwing velocity in elite adolescent handball players. Methods Seventeen elite male adolescent handball players (16.4 ± 0.7 years, mean ± SD) were exposed to two upper-body vibration protoc...

Background Traditionally, stretching protocols are basic components of warm-up aiming to improve performance and reduce injuries. However, the literature suggests that different stretching protocols during warm-up may have diverse effects on performance. Objective The purpose of this study was to compare the acute effects of three different stretc...

Abstract Although exercise is generally known to augment insulin sensitivity, its effect on aged individuals is not clear. This study aimed to identify the effects of moderate-intensity lifelong and acute exercise on insulin sensitivity of aged rats and also examine how long these effects last. Twenty-six male Wistar rats exercised from 3 to 12 mon...

This research was conducted to find out how effective the High Pick and Roll is, according to the defence’s reaction. This survey also investigates the total impact of this offensive strategy on the game’s final result. The sample consisted of 20 randomly selected basketball games of the Olympic Games in Rio (2016). The results show that the outcom...

The purpose of the present study was to investigate the role of specific warm-up in soccer on 20 m sprint after static and dynamic stretching in a sample of 16 healthy amateur soccer players, aged 21,41±3,28 years. All participants performed on different days and in random order, a warm-up program that included general warm up, static or dynamic st...

The aim of the present study was to compare the acute effect of static and dynamic stretching on countermovement jump (CMJ) and ten meters sprint performance for basketball players. Twenty semi-professional basketball players, 23.4 ± 0.5 yo, height 185.6 ± 2.8 cm, body mass 84.8 ± 6.2 kg, training age 10.4 ± 2.5 yr, performed a static (SS) and a dy...

The purpose of this study was to investigate the effects of static stretching duration on isokinetic peak torque output at low and high angular velocities in basketball players. Sixteen basketball players, aged 21.8 ± 1.2 years old, of the same training level, participated in the study. The athletes performed randomly, on different days, two static...

The effect of the duration of static stretching as well as that of the number of repetitions in acute stretching protocols on flexibility has not been extensively examined in the elderly. The aim of the present study was to investigate the acute effects of stretching duration on the range of motion (ROM) of the lower extremities and the trunk in el...

The aim of the present study was to assess the acute effect of selected mat Pilates exercises on the lower extremities joint flexibility of female amateur soccer players. Eighteen volunteers, all female amateur soccer players, with a mean age of 25.6±3.5 years old, mean height of 168.3±2.8 cm, mean body mass equal to 66.4±6.2 kg and mean training a...

While athletes routinely perform warm-up and stretching exercise, it has been suggested that static stretching immediately after the low-intensity aerobic exercise might affect negatively the sprint performance. Due to the fact that in soccer athletes performed specific soccer warm-up before the game, the purpose of this study was to examine the co...

The purpose of the study was to investigate the effects of resistance training (RT) and sensorimotor training combined with RT (SM-RT) on balance, 1 repetition maximum (RM), rate of force development (RFD) and squat jump (SJ) height. Twenty amateur soccer players were equally divided into two groups assigned as SM-RT group (age 22±1.7 years, body m...

The purpose of this study was to compare the acute effects of three different stretching protocols on balance, agility, reaction time and movement time of the upper limbs. Participants were thirty one female high school athletes (age = 17.3 ± 0.5 yr.). All participants performed one of the following protocols on different days: (a) 3 min jogging fo...

The purpose of this study was to compare the acute effects of three different stretching protocols on balance, agility, reaction time and movement time of the upper limbs. Participants were thirty one female high school athletes (age = 17.3 ± 0.5 yr.). All participants performed one of the following protocols on different days: (a) 3 min jogging fo...

Dancing is an excellent alternative exercise for improving health related physical fitness elements. Dance performance requires support from enhanced physiological requirements necessary for dancers including cardiovascular fitness, muscle flexibility, muscular strength/power. A reduction in muscular strength associate with injury risk and many dan...

Abstract The aim of this study was to examine the effect of a 10-week combined resistance/sprint training programme in the post-activation potentiation of sprint performance before, between and after resistance training sets. Twenty-six junior basketball players were randomly divided into a control and a combined training group. The combined traini...

Warm-up is used before every competitive sporting activity as a means to activate the body, reduce the risk of injury and increase performance in subsequent tasks. However, there is little information on how long the eVects of warm-up last. This is of particular interest in basketball playing, since no rewarm-up is allowed to players who sit on the...

Warm-up is used before every competitive sporting activity as a means to activate the body, reduce the risk of injury and increase performance in subsequent tasks. However, there is little information on how long the eVects of warm-up last. This is of particular interest in basketball playing, since no rewarm-up is allowed to players who sit on the...

The purpose of this study was to investigate the effect of a 10-week heavy resistance combined with a running training program on the strength, running speed (RS), and vertical jump performance of young basketball players. Twenty-six junior basketball players were equally divided in 2 groups. The control (CON) group performed only technical prepara...

This review focuses on the factors effecting Post-Activation Potentiation (PAP) and its application in complextraining. It was shown that the training level, the type of muscle fiber, the type of contraction, the duration of contraction, and the volume of contraction are factors which effect the duration and magnitude of PAP. It has also reported t...

The purpose of this research was to investigate the relationship between coaching behavior and role ambiguity in defensive responsibilities using interdependent Greek sport teams. Athlete perceptions of role ambiguity (defense) were assessed using a questionnaire developed by Beauchamp, Bray, Eys and Carron (2002) andcoaching behavior was assessed...

The main goal of this research is to examine the importance of different kind of passes through their frequency of appearance and success that male and female basketball players execute in Greek championships.The sample consisted of male and female teams of Thessaloniki - Greece. The 1st group consisted of male teams (18 from different divisions) w...

The purpose of this research was to investigate the differences of the role ambiguity in offense responsibilitiesfor athletes of team sports. As sample were used 421 athletes of basketball (n=125), handball (n=106), volleyball(n=78) and soccer (n=112). We used the role ambiguity questionnaire (Role Ambiguity Scale, Beauchamp et al.,2002) and referr...

Σκοπός της έρευνας ήταν να διερευνηθεί η χρήση του ερωτηματολογίου της Ασάφειας Ρόλων (Role Ambiguity Scale, Beauchamp et al., 2002) στον Ελληνικό αθλητισμό, εξετάζοντας τη δομική εγκυρότητα και αξιοπιστία του. Το ερωτηματολόγιο καθορίζει πόσο ξεκάθαροι και σαφείς είναι οι επιθετικοί και αμυντικοί ρόλοι, στους αθλητές και αθλήτριες ομαδικών αγωνισμ...

The purpose of this research was to investigate the use of the questionnaire of Coaching Behavior, of Greek Team Sports’ athletes, by checking its structural validity and reliability. The sample consisted of 422 athletes of basketball, volleyball, handball and soccer. The reliability analysis, confirmed satisfactory Cronbach’s alpha rates from .63...

The purpose of this study was to investigate the use of the questionnaire of Role Ambiguity (Role Am-biguity Scale, Beauchamp et al., 2002), in offensive and defensive responsibilities, of Greek Team Sports’ ath-letes, by checking its structural validity and reliability. The sample consisted of 411 athletes, basketball, vol-leyball, handball and so...

The purpose of the present study was to record and evaluate the characteristics of successful set-plays. The examination of the 64 games from the 18 th World Cup in Germany was conducted with the aid of video-analysis' software Sportscout. There was examined the type of the offence that ended with a goal scoring, the frequency of goal scoring exami...

The purpose of this study was to examine the effects of prolonged basketball skills training on maximal aerobic power, isokinetic strength, joint mobility, and body fat percentage, in young basketball players, and controls of the same age. Twenty basketball players and 18 control boys participated in the study. Basketball players participated both...

A distinction in volleyball comes as a result of specific physiological, kinesiological, psychological, as well as environmental influences. The purpose of the present study was to record and evaluate the training and demographic features of the Greek women's National volleyball team, in order to identify which of the above factors influence, diffe...

The purpose of the present study was to examine the element of systematic defense in handball game of Greek championship. Were analyzed fifteen games of handball at the period of 2002-2003. Were recorded the frequency of defensive systems, the spaces by which were realized the throws, their result and the point of the goalpost to which the ball end...

Abstract Participation in intensive sports leads to muscular specializations that may generate alterations in involved articular forces. The purpose of this study was to examine the peak torque and strength balance in the extensor and flexor muscle groups, as well as the hamstring to quadriceps (H/Q) ratios on the right and left limbs in soccer pl...

The effect of the duration of static stretching as well as that of the number of repetitions in acute stretching protocols on flexibility has not been extensively examined in the elderly. The aim of the present study was to investigate the acute effects of stretching duration on the range of motion (ROM) of the lower extremities and the trunk in el...

The purpose of the present study was to examine the effects on resting systolic and diastolic blood pres-sure, after 10 weeks strength training program on cycle ergometer. Forty six boys 13 year-olds participated in this study. Subjects were divided into four groups, two exercise groups A (n=12 untrained boys) and C (n=13 basketball players) and tw...

The purpose of the study was to investigate the effect of stretching exercises on lower extremity range of motion (ROM) in prepubertal, pubertal and adolescent boys. We also aimed to examine the initial ROM among the three age groups for both sides of the body. A total of 110 boys aged 10, 13 and 16 years old were divided into two equal groups (tra...

Περίληψη Σκοπός της παρούσας έρευνας ήταν να μελετήσει τα στοιχεία της συστηματικής άμυνας της Eλληνικής χειροσφαίρισης. Aναλύθηκαν δέκα πέντε αγώνες χειροσφαίρισης της αγωνιστικής περιόδου 2002-2003. Kα- ταγράφηκε η συχνότητα των αμυντικών συστημάτων, οι χώροι από τους οποίους πραγματοποιήθηκαν οι ρίψεις, το αποτέλεσμά τους, καθώς και τα σημεία όπ...