Publications by authors named "Konstantina Karatrantou"

Pre-game warm-up is integral to athletes' preparation before a basketball game. The main objectives of this study were to compare specific performance indicators before and immediately after a basketball pre-game warm-up, and examine the individualized players' responses. The impact of rest intervals after warm-up (9-23 min) was also examined.

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Tennis coaches display significant influence, catalyzing changes in athlete performance, motivation, and overall well-being. Research on coaches' motivations and their impact on coaching style, work, and well-being is limited, especially in individual sports like tennis. Based on self-determination (SDT) and achievement goal (AGT) theories, the aim of the present study was to examine the relationships of coaches' self-determined motivation (intrinsic, extrinsic, and amotivation), basic psychological needs satisfaction (autonomy, relatedness, and competence), and achievement goals (self-improvement-SI, self-enhancement-SE, self-transcendence-ST) with their coach-created empowering-disempowering motivational climate, work engagement, and well-being (subjective vitality).

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Recreational team sports have received great acceptance lately, in different populations, indicating encouraging results in health-related quality of life. This study examined the efficacy of a 3-month basketball exercise program on selected indices of health (body mass-BM, body fat-BF, blood pressure-BP), functional capacity (flexibility of lower and upper limbs, balance), and physical fitness (maximum strength of lower limbs, trunk and handgrip, aerobic capacity) in middle-aged individuals. Forty middle-aged individuals (males and females; 40-55 years old) were randomly divided into (a) exercise (EG; = 20) and (b) control groups (CG; = 20).

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The high levels of musculoskeletal pain, in conjunction with the low levels of functional capacity, may negatively affect workers' health, efficiency, and productivity. This randomized controlled study investigated the efficacy of a 6-month comprehensive workplace exercise program on musculoskeletal pain and functional capacity in office workers. Seventy male and female office workers with musculoskeletal pain in any body area were randomly assigned to either an intervention (IG; = 35) or a control group (CG; = 35).

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The children's fairytale is a playful educational tool that can be modified in such a way to enhance motor proficiency. This study investigated the effect of an online exercise program with modified fairytales on children's motor proficiency during the kindergarten curriculum. Forty preschool children (20 girls and 20 boys; 5.

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Reliable fitness tests with low day-to-day and trial-to-trial variation are a prerequisite for tracking a player's performance or for identifying meaningful changes in training interventions. The present study examined the inter- and intra-session reliability of 30 m linear speed with and without ball possession as well as the reliability of a specific performance index of pubertal soccer players. A total of 40 pubertal (14.

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Lately, chairs have been widely used as a cheap, easily accessible, safe, and effective training means in different settings (e.g., in gyms, the house, workplaces, and in rehabilitation).

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The present study examined and compared the isokinetic peak torque and the reciprocal ratios of the knee joint between young basketball and soccer players. An amount of 100 soccer and 100 basketball players took part in this study and were separated into five equal groups (n = 20), according to their chronological age (12, 13, 14, 15, and 16 years old). The absolute concentric (CON) and eccentric (ECC) peak torque of the knee flexor and extensor muscles (at 60°/s, 180°/s) were assessed using a Cybex Norm dynamometer, and the relative peak torque (per unit of body mass), as well as the conventional (CON/CON; ECC/ECC) and functional (CON/ECC; ECC/CON) ratios, were calculated.

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Corporate wellness has become an important public health priority through the designing and implementation of different workplace exercise interventions. The objectives of this study were to investigate: (a) the effectiveness of a 4-month workplace combined yoga, Pilates, and circuit strength training program (outside work shift) on health indices, functional capacity, and physical fitness in office employees; and (b) the employees' enjoyment following the program. Fifty physically active office employees (26-55 years old) were equally divided into training (TG) and control groups (CG).

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Previous studies indicated different acute adaptations between obese and lean individuals, while there is limited information with conflicting results regarding long-term adaptations. The aim of this study was to compare the efficacy of a 3-month integrated combined training between obese and lean middle-aged untrained premenopausal women. In total, 72 women (36 obese/36 lean) were divided into four groups: (a) obese exercise (OB-EG), (b) obese control (OB-CG), (c) lean exercise (L-EG), and (d) lean control (L-CG).

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Background: One of the most important steps for the successful designing, execution, and sustainability of a workplace wellness program is the evaluation stage.

Objectives: The purpose of this research was to create a comprehensive wellness profile through selected and reliable testing protocols used for the evaluation of health, functional capacity, and physical fitness in office employees.

Methods: One hundred office employees (32-55year-old) were evaluated to create a comprehensive wellness profile.

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The purpose of this study was to examine and compare the training and detraining effects of outdoor serial and integrated combined exercise programs on health, functional capacity, and physical fitness indices. Fifty-one untrained overweight/obese males (47 ± 4 years) were divided into a serial combined (SCG), an integrated combined (ICG), or a control (CG) group. The SCG and ICG implemented a 3-month training (3 sessions/week) consisting of walking and body weight exercises.

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Purpose: The demanding and exhausting working hours, as well as the bad and unsuitable working conditions that prevail in several hospitals, affect employees' physical and mental health. The purpose of this study was to examine the effectiveness of a daily 6-week supervised workplace exercise program on health indices, functional capacity, overall fitness, subjective vitality, and life satisfaction in health professionals.

Methods: A randomized controlled study was used.

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Introduction: Shooting ability is an important aspect of performance in some sports and is vital during a military operation. Load carriage, clothing, and equipment normally associated with fatigue and reduced field of vision or lack of stability at a specific point are important factors that affect the ability to aim when shooting. Additionally, gun support and equipment appear to differentially affect shooting ability with varying shooting positions.

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In this study the effect of a surface combat swimming (sCS) training program on performance in freestyle swimming and sCS was examined. Forty-five officer cadets were divided into three equivalent groups: a control group (CG), a group that was trained only with a swimsuit and fins (SF), and a group that was trained with combat uniform and equipment (UE). Groups SF and UE followed a 60-min training program with sCS for 4 weeks, 4 times per week.

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This study investigated the effectiveness of a specialized strength training program on maximal handgrip strength in young wrestlers. 72 young wrestlers (36 children: 8-10 years-old and 36 adolescents:13-15 years-old) participated in the present study. Both age-categories were assigned into a training group (18 children and 18 adolescents) and a control group (18 children and 18 adolescents).

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Purpose: To the best of our knowledge, no previous study has examined the health-promoting effects of a daily supervised concurrent workplace training program in inactive office workers. The main objective of this study was to examine the effectiveness of a 6-month workplace training program on health indices, musculoskeletal pains, functional capacity, and physical fitness in office workers.

Design: Randomized controlled study.

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This study compared the efficacy of two whole-body vibration (WBV) protocols with equal training volume and different frequency of training sessions/week on body composition and physical fitness. Sixty male air force cadets (age: 20.5±1.

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Vertical jumping ability (VJ) is an important component for successful performance in various team sports such as volleyball, basketball, and soccer. There is evidence that the sport-specific training in these sports may affect the development of VJ throughout the developmental years. Thus, the main objective of this study was to investigate the sport-related effect (volleyball, basketball, soccer) on vertical jumping ability (VJ) and on the stretch-shortening cycle (SSC) during puberty.

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Aim: The main objectives of this research were to a) examine the test-retest reliability of aquaticity test (study 1), b) investigate the efficacy of 'swimming lesson', during the physical education course, in the aquaticity (study 2) and c) examine enjoyment from the 'swimming lesson' (study 3) in primary school students of the 3rd grade.

Methods: In the first study, 23 students performed 2 assessment sessions for the evaluation of aquaticity, separated by 1 week. In the second study, 30 students followed a short-term swimming training programme (9 sessions).

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The main objective of this study was to provide an extensive isokinetic profile of the hip joint in youth soccer players, where the literature is limited. Additionally, this study investigated the effect of age on isokinetic peak torque values of hip abductor and adductor muscles and on reciprocal muscle group torque ratios in youth soccer players at different angular velocities (30 vs. 90o/s) and muscle actions (concentric vs.

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Background And Purpose: Dynamic handgrip strength endurance is essential for daily activities that require repetitive gripping movements for a sustained period. At this time, there is no information about the reliability of measurement of dynamic handgrip strength endurance in older individuals. Thus, the purpose of this study was to investigate the test-retest reliability of dynamic handgrip strength endurance in older women.

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Purpose: This study investigated the reliability of static and dynamic handgrip strength endurance using different protocols and indicators for the assessment of strength endurance.

Methods: Forty young, healthy men and women (age, 18-22 years) performed 2 handgrip strength endurance protocols: a static protocol (sustained submaximal contraction at 50% of maximal voluntary contraction) and a dynamic one (8, 10, and 12 maximal repetitions). The participants executed each protocol twice to assess the test-retest reproducibility.

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What is the central question of this study? In obesity, the exaggerated blood pressure response to voluntary exercise is linked to hypertension, yet the mechanisms are not fully elucidated. We examined whether involuntary contractions elicit greater haemodynamic responses and altered neural control of blood pressure in normotensive obese versus lean women. What is the main finding and its importance? During involuntary contractions induced by whole-body vibration, there were augmented blood pressure and spontaneous baroreflex responses in obese compared with lean women.

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Whole-body vibration (WBV) exercise is an alternative, popular and easy exercise that can be followed by general public. Therefore, the aim of the present study was to investigate the influence of acute and chronic WBV exercise on health-related parameters. Twenty-eight women were allocated into a control group (n=11, mean ±SEM: age, 43.

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