Spyridon Methenitis

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• B.Sc., M.Sc., Ph.D. , Post-Doctoral Fellow
• PostDoc Position at National and Kapodistrian University of Athens

The present study aimed to investigate the correlation between muscle fiber type variables and sprinting, jumping, strength, power and endurance performances in sprinters and marathon runners. Furthermore, the study explored which muscle fiber type variable influences athletes’ performance the most and which variable discriminates sprinters from ma...

Background/Objectives: The aim of the present study was to investigate the effect of two long-term reduced concurrent training frequencies (incorporating power training for the upper and high-intensity interval aerobic training for the lower extremities), in which participants performed one training session every either 7 or 14 days, after 12 weeks...

In the current work, the non-invasive approach of breath analysis is implemented for the first time in an eccentric exercise protocol that investigated the effect of spirulina supplementation on exercise-induced oxidative stress. We assessed whether volatile alkanes in exhaled breath can serve as alternative biomarkers of oxidative stress. A random...

The aim of the study was to investigate the effect of two long-term reduced concurrent training modalities, in which participants performed one training session every either 7 or 14 days, after 12 weeks of systematic concurrent resistance and aerobic training, on lower extremities’ muscle strength, power, and morphology in young females. After the...

This randomized, double-blinded, experimental study investigated the effects of a four-week daily pre-workout supplementation (200 mg caffeine, 3.3 g creatine monohydrate, 3.2 g β-alanine, 6 g citrulline malate, and 5 g BCAA) vs. placebo (isocaloric maltodextrin) on anaerobic (jumping, sprinting, agility, and the running-based anaerobic sprint test...

Prolonged application (> 20 minutes) of local vibration (LV) on muscles or tendons is known to reduce maximal isometric strength (1-4). However, the effect of short vibration durations (< 6 minutes) is still un-known. The aim of the present study was to identify the shortest duration that would induce a reduction in the knee extensor muscles’ force...

The prolonged application (>20 min) of local vibration (LV) on muscles or tendons is known to reduce maximal isometric strength. However, the effect of short vibration durations (≤6 min) is still unknown. In fourteen participants, the changes in maximal voluntary isometric contraction (MVIC) were measured after 1, 3, and 6 min of rest (CONT) or loc...

Prolonged application (> 20 minutes) of LV on muscles or tendons is known to reduce maximal isometric strength. However, the effect of short vibration durations (< 6 minutes) is still unknown. In fourteen participants, the changes in maximal voluntary isometric contraction (MVIC) were measured after 1, 3, and 6 minutes of rest (CONT) or local vibra...

Mammalian skeletal muscles contain varying proportions of Type I and II fibers, which feature different structural, metabolic and functional properties. According to these properties, skeletal muscles are labeled as ‘red’ or ‘white’, ‘oxidative’ or ‘glycolytic’, ‘slow-twitch’ or ‘fast-twitch’, respectively. Redox processes (i.e., redox signaling an...

Purpose The aim of the present study was to investigate the association between muscle fiber composition, body composition, resting glycemic–lipidemic blood profiles, in apparently healthy, young, active females. Methods Thirty-four young healthy female volunteers were allocated into two groups, depending on their Vastus Lateralis type IIx muscle...

Body weight support (BWS) and incline running (IR) are commonly used either during rehabilitation or during training separately, with many positive effects on athletes’ performance and rehabilitation. The aim of the present study was to investigate the interaction between bodyweight support and incline running on the electromyographic activity of t...

Body weight support (BWS) and incline running (IR) are commonly used either during rehabilitation or during training separately, with many positive effects on athletes’ performance and rehabilitation. The aim of this study is to investigate the effect of BWS and IR. In eighteen healthy men (age: 20.3 ± 1.2 yr, body weight: 70.2 ± 4.8 kg, body heigh...

A pre-workout supplement’s (PWS; 200 mg caffeine, 3.3 g creatine monohydrate, 3.2 g β-alanine, 6 g citrulline malate and 5 g branched chained amino acid (BCAA) per dose) acute effects on the alactic (jumping, sprinting, agility), lactic (Running-Based Anaerobic Sprint Test, RAST) and aerobic performance (Yo-Yo Intermittent Recovery Test Level 1, Yo...

The aim of the present study was to compare the effect of chronic concentric or eccentric training on position sense and joint reaction angle, in healthy, untrained young men. Twenty-four men were randomly assigned into a pure concentric (CT) or a pure eccentric (ET) group and performed for 8 weeks, one training session/week, 75 maximal knee extens...

Introduction: This cross-sectional study explored whether nutrition, body composition, and physical activity energy expenditure (PAΕΝ) have a differential impact on lipidemic blood profiles among young females with different blood cholesterol concentrations. Methods: One hundred thirty-five young female students (N = 135) were allocated into thr...

Background and aim: The aim of the present study was to investigate the hypothesis that healthy, normal weight females with greater proportions and sizes of oxidative muscle fibers would also be characterized by healthier body composition, compared to individuals with increased glycolytic fibers, even if both follow similar nutritional plans Method...

Background and Objectives: Cancer treatments can adversely influence body weight status, body composition, phase angle (PhA), and resting metabolic rate (RMR), which could possibly affect disease course. Τhe aim was to assess differences in body composition, PhA, RMR, and related parameters in non-small-cell lung cancer (NSCLC) patients after treat...

ΣΚΟΠΟΣ: Στο δυναμικό τρίαθλο η μέγιστη μυϊκή δύναμη αποτελεί τον κυριότερο παράγοντα της επίδοσης. Σε μυϊκές προσπάθειες που απαιτούν την παραγωγή μέγιστης δύναμης, η ταχύτητα μετακίνησης του φορτίου είναι χαμηλή. Συνεπώς, η εργαστηριακή αξιολόγηση της μέγιστης δύναμης σε αθλητές του δυναμικού τριάθλου θα μπορούσε να πραγματοποιηθεί με ισομετρικές...

Systematic, regular high-volume endurance training induces significant metabolic adaptations in glucose and lipids metabolism, which seems to affect the negative impact of unhealthy nutrition, at least in animal models. The present study aimed to investigate the main determinants of body composition, blood glucose and lipids concentrations between...

This study aimed to explore the importance of aerobic capacity and nutrition on 28-km mountain running performance and race-induced changes in body composition and biochemical blood indices, in recreational master athletes of different performance levels. Twenty male master runners (age: 44.6 ± 7.7 years) were divided into two groups, slower and fa...

The aim of the present study was to investigate which of the four musle heads of the quadriceps femoris is the best surrogate of quadriceps hypertrophy, following resistance training, evaluated by ultrasonography. Forty three physical education students (age: 22.1 ± 3.1 years, height: 175.2 ± 9.3 cm, mass: 75.3 ± 8.0 kg, BMI: 22.8 ± 2.8 kg·m−2) par...

The aim of this study was to develop accurate, reliable, and reproductive equations for the prediction of maximum oxygen uptake ( V ˙ O2max) in male and female high-level adolescent rowers. This study included two parts. In the first part, V̇O2max was evaluated in 106 male and 83 female high-level adolescent rowers during an incremental step test (...

OPTIMIZATION OF 10 M SPRINT PERFORMANCE WITH A SLED STIMULUS IN CONTRAST SPRINT TRAINING PAIZIS, C.1, FURCHERT, P.1, COMETTI, C.1, METHENITIS, S.2, BABAULT, N.1 1 UNIVERSITY OF BURGUNDY, INSERM U1093, CENTRE D' EXPERTISE DE LA PERFORMANCE, DIJON, FRANCE. 2 NATIONAL AND KAPODISTRIAN UNIVERSITY OF ATHENS INTRODUCTION: Resisted sled sprint trainin...

The present article aims to discuss the hypothesis that skeletal muscle per se but mostly its muscle fiber composition could be significant determinants of lipid metabolism and that certain exercise modalities may improve metabolic dyslipidemia by favorably affecting skeletal muscle mass, fiber composition and functionality. It discusses the mediat...

The purpose of this study was to investigate the differences between weightlifters and track and field throwers in terms of the rate of force development (RFD), lean mass, muscle architecture and one-repetition maximum (1-RM) muscle strength. Sixteen elite male athletes (eight weightlifters and eight track and field throwers) participated in the st...

Thomas, K, Spyridon, M, Nikolaos, Z, Angeliki-Nikolleta, S, Giorgos, K, Giorgos, G, and Gerasimos, T. Effects of complex vs. compound training on competitive throwing performance. J Strength Cond Res XX(X): 000-000, 2022-The purpose of this study was to investigate the effects of complex (CPX; strength and power exercises in pairs) vs. compound (CP...

Background/objective: Aetiology and significance of exercise-induced troponin release remains a contentious issue. We investigated the effect of a 28 km mountain run on cardiac troponin I (cTnI), in relation to training, performance, nutritional, biochemical and echocardiography variables, in a group of 25 recreational male master athletes. Mater...

Highlights: Power training induce beneficial changes in body composition, glycemic and lipidemic profilesGreater training volumes are needed for the healthier changes in glycemic-lipidemic profilesHigher Type I, IIA and lower IIX percentage cross-sectional areas are linked with healthier body composition and glycemic-lipidemic profilesIndividuals...

The purpose of the present study was to examine the effect of different conditioning activities (CAs) on short-term increase in sprint performance. In twelve male sprinters (21.1±2.6 years, 100 m performance: 11.5±0.6 s) their body composition, half squat maximum strength, 100 m sprinting and countermovement jump performances were evaluated. The pe...

Objectives: The aim of the present study was to compare the short-term effects of a hypocaloric Mediterranean diet and two high protein diets, with and without whey protein supplementation, on body composition, lipidemic profile, and inflammation and muscle-damage blood indices in overweight, sedentary, young participants. Methods: Thirty-three...

The aim of the study was to investigate the relationships between vastus lateralis muscle fiber length and fiber type composition in individuals with minimal exposure to systematic resistance/power training. In sixty female physical education students (age: 21.03 ± 2.1 years, body weight: 59.8 ± 9.7 kg, body height: 166.2 ± 6.5 cm), with no experie...

Objective The aim of the present study was to investigate the relationships between protein intake (during the tapering period and the race), marathon performance, body composition, acute race induced changes and selected metabolic and muscle damage-related blood biomarkers, in recreational master runners. Methods In 58 experienced master runners...

Subclinical, low-grade, inflammation is one of the main pathophysiological mechanisms underlying the majority of chronic and non-communicable diseases. Several methodological approaches have been applied for the assessment of the anti-inflammatory properties of nutrition, however, their impact in human body remains uncertain, because of the fact th...

Introduction Myotonic dystrophy type 2 (DM2) is a neuromuscular disorder characterized by myotonia and muscle weakness, with no medical treatment to prevent a decline in decline. It is unknown whether exercise training is effective in DM2. The aim of this study was to investigate the effect of exercise training on functional capacity and body compo...

Aim of the study was to compare the isometric strength of flexors and extensors trunk muscles between male and female elite adolescent athletes of different age and training experience. Absolute and relative trunk muscle isometric peak extension (PTE) and flexion (PTF) torque, as well as flexion/extension (F/E) ratio were evaluated in 388 elite ado...

Purpose: The aim of the present study was to identify the contribution of nutrition, physical activity (PA), and total energy intake and expenditure on body weight and composition in adolescents. Methods: Body composition, PA, and dietary intakes from 904 Greek adolescents (446 boys and 458 girls; Age: 14.6 ± 1.5 yrs), were evaluated. All participa...

BACKGROUND Data about lower extremities’ strength and power asymmetries in fencers, and their relationships to fencing performance are limited and inconsistent. OBJECTIVE The aim of the present study was to investigate asymmetries, between dominant (D) and non-dom (ND) legs of elite young male and female fencers, in relation to performance in fenc...

Research on hyponatremia during mountain marathons is scarce. The present study aimed to investigate the prevalence of exercise-associated hyponatremia during a 44-km trail running race that reached an altitude of 2780 m (Olympus Marathon). Sixty-two runners (five women) who completed the race participated in the study (age: 34.4 ± 8.6 years; heigh...

This study aimed to investigate the effect of 3 different eccentric-only power training volumes on muscle fiber type composition and power performance. Twenty-nine females were assigned into 3 groups and performed 10 weeks of either 3 (low volume), 6 (moderate volume), or 9 (high volume) sets/session of 4 fast-velocity eccentric-only half-squats ag...

BACKGROUND Rate of torque development (RTD) could serve as a useful index for the readiness and fatigue of soccer players. OBJECTIVE The identification of RTDs time-course changes after a Loughborough Intermittent Shuttle Test (LIST), the effect of bovine colostrum (BC) supplementation on RTD changes, and to explore the relationships between RTD a...

AIM: Subclinical, low-grade, inflammation is one of the main pathophysiological mechanisms underlying the majority of chronic diseases. Ιt is therefore obvious that an inflammatory model, inducing inflammatory responses to humans in a regulated, specific, and non-harmful way, could greatly facilitate the assessment of redox and immune status. Exerc...

The aim of the study was to evaluate power performance and muscle morphology adaptations in response to 5 weeks of fast-eccentric squat training (FEST) performed twice per week, with three different training volumes. Twenty-five moderately trained females were assigned into three groups performing eight repetitions of FEST of either four sets (4 ×...

Spiliopoulou, P, Zaras, N, Methenitis, S, Papadimas, G, Papadopoulos, C, Bogdanis, GC, and Terzis, G. Effect of concurrent power training and high-intensity interval cycling on muscle morphology and performance. J Strength Cond Res XX(X): 000-000, 2019-The aim of the study was to examine the effect of performing high-intensity interval cycling on m...

The aim of the study was to investigate the rate of force development (RFD) and muscle architecture early adaptations in response to training with fast- or slow-velocity eccentric squats. Eighteen young novice participants followed six weeks (two sessions/week) of either fast-velocity (Fast) or slow-velocity (Slow) squat eccentric-only training. Fa...

Purpose: The purpose of the present study was to investigate whether a) modification in muscle architecture due to training intervention and b) neuromuscular explosive field tests results may predict competition performance in track and field throwing athletes. Methods: Eleven track and field throwers completed 10 weeks of specific training that wa...

The majority of sports rely on concurrent training (CT; e.g., the simultaneous training of strength and endurance). However, a phenomenon called “Concurrent training effect” (CTE), which is a compromise in adaptation resulting from concurrent training, appears to be mostly affected by the interference of the molecular pathways of the underlying ada...

Aim of the study was to investigate the relationship between lower body rate of force development and lean body mass, with competitive shot-put throwing performance in female shot-putters using the linear style. Seven female shot-put athletes (age: 24.4 ± 4.2yrs, body height: 172.8 ± 5.2cm, body mass: 93.3 ± 10.5kg, 4.4 ± 2.0 years of competition e...

A poster about systematic moderate intensity aerobic exercise impact on body weight, fasting plasma glucose, total cholesterol and blood pressure in elderly women.

The purpose of the present study was to investigate the effect of a short-term, high-intensity, low-volume Mixed Martial Arts (MMA) specific strength and conditioning training program on performance in national level MMA athletes. Seventeen experienced fighters were divided into two groups: (A) Specific Training Group (STG; n = 10), which followed...

This study compared knee angle-specific neuromuscular adaptations after two low-volume isometric leg press complex training programmes performed at different muscle lengths. Fifteen young males were divided into two groups and trained three times per week for 6 weeks. One group (n = 8) performed 5–7 sets of 3 s maximum isometric leg press exercise,...

The rate of force development (RFD) is vital for power athletes. Lean body mass (LBM) is considered to be an essential contributor to RFD, nevertheless high RFD may be achieved by athletes with either high or low LBM. The aim of the study was to describe the relationship between lower-body LBM and RFD, and to compare RFD in taekwondo athletes and t...

Muscle fascicle length and muscle fibre conduction velocity (MFCV) are thought to be important parameters for power performance. It might be expected that faster muscle fibre conduction velocities would compensate for longer fascicle lengths to increase the speed of action potential propagation along the elongated fibres. However, the relationship...

The aim of this study was to investigate whether resistance training at short or long triceps brachii fascicle length induces different muscular strength and architectural adaptations. Nine young, novice, female participants, were trained for 6 weeks (two sessions/week) performing 6 sets × 6-RM (repetition maximum) unilateral cable exercises either...

The purpose of the present study was to investigate and assess the nutritional practices of open-water swimmers, during the preparation period and the competition, as well as their implications on performance and anthropometric parameters according to their age. Twenty-four (n=24) men open-water swimmers, twelve young (26.3±4.9yrs) and twelve older...

The purpose of the study was to investigate the relationship between muscle fiber composition and the rate of force development (RFD) in well-trained individuals with different training background. Thirty-eight young males with different training background participated: 9 endurance runners, 10 power-trained, 9 strength-trained, and 10 sedentary. T...

Objective: The purpose of the present study was to investigate and assess the common dietary and weight management strategies of Tae Kwon Do (TKD) athletes prior to national competitions, as well as to examine the relationships between these strategies and body weight reduction and sensation of physical condition. Methods: Sixty (n = 60) TKD athle...

Characterization of the least number of muscle fibers analyzed for a quick and reliable, evaluation of intramuscular fiber conduction velocity (MFCV) is of importance for sport scientists. Aim of the present study was to evaluate the reliability of vastus lateralis’ intramuscular MFCV measuring either 25 or 50 different muscle fibers per participan...

The purpose of the present study was to investigate the effect of different types of upper and lower' extremities exercises on acute increase of shot put performance, in moderate experienced throwers. Eight (n=8) males and nine (n=9) female throwers participated in the present study. Their bench press and squat maximum strength were measured while...

Full Curriculum Vitae of Dr. Metheniti Spyridon 2017

Objectives Studies on the elderly revealed that the negative effects of ageing are limited or even reversed through regular exercise and the elderly well-being can be enhanced by active exercise participation. Regarding exercise intensity, low to moderate exercise is more effective and safety for elderly than vigorous. As more individuals live long...

Conduction of electrical signals along the surface of muscle fibers is acknowledged as an essential neuromuscular component which is linked with muscle force production. However, it remains unclear whether muscle fiber conduction velocity (MFCV) is also linked with explosive performance. The aim of the present study was to investigate the relations...

Purpose: The aim of the study was to investigate the effects of low-intensity running performed immediately after lower-body power-training sessions on power development. Methods: Twenty young females participated in 6 weeks, 3/week, of either lower body power training (PT) or lower body power training followed by 30 min of low-intensity running...

Purpose: Aim of the study was to explore the relationship between muscle fiber conduction velocity (MFCV), fiber type composition and power performance in participants with different training background. Methods: 38 young males with different training background participated: sedentary (n=10), endurance runners (n=9), power-trained (n=10), stren...

The aim of the study was to examine the correlation between muscle morphology and jumping, sprinting, and throwing performance in participants with different power training duration experience. Thirty-six power-trained young men were assigned to 3 groups according to the length of their power training: less experienced (<1 year), moderately experie...

The cytokine granulocyte colony-stimulating factor (G-CSF) binds to its receptor (G-CSFR) to stimulate hematopoietic stem cell mobilization, myelopoiesis, and the production and activation of neutrophils. In response to exercise-induced muscle damage, G-CSF is increased in circulation and G-CSFR has recently been identified in skeletal muscle cells...

The purpose of this study was to evaluate the effects of a plyometric protocol on round kick force and lower limbs’ jumping performance in elite karate athletes and to examine whether this plyometric protocol could be used over repeated trials in competitive warm up conditions. Ten elite level karate athletes (5 males and 5 females) were randomly a...

The rate of force development (RFD) is an essential component for performance in, explosive activities, while it has been proposed that muscle architectural characteristics, might be linked with RFD and power performance. The purpose of the study was to, investigate the relationship between RFD, muscle architecture and performance in, young track a...

The cytokine granulocyte-colony stimulating factor (G-CSF) binds to its receptor (G-CSFR) to stimulate haematopoietic stem cell mobilization, myelopoiesis and the production and activation of neutrophils. G-CSF is increased in the circulation in response to exercise-induced muscle damage and the G-CSF receptor (G-CSFR) has recently been identified...

Conduction of electrical signals along the surface of muscle fibers is acknowledged as an essential neuromuscular component which is linked with muscle force production. However, it remains unclear whether muscle fiber conduction velocity (MFCV) is also linked with explosive performance. The aim of the present study was to investigate the relations...

PURPOSE: To evaluate the effect of a combination of power training with isometric leg press training at two different knee angles on muscle force and vertical jump performance. METHODS: Fifteen male university students (age: 21.5±2.0 yrs, height: 177±5 cm, body mass: 78±8 kg) trained three times per week for 6 weeks. Following the preliminary tests...

Zaras, ND, Stasinaki, A-NE, Krase, AA, Methenitis, SK, Karampat-sos, GP, Georgiadis, GV, Spengos, KM, and Terzis, GD. Effects of tapering with light vs. heavy loads on track and field throwing performance. J Strength Cond Res 28(12): 3484–3495, 2014— The purpose of the study was to investigate the effects of power training with light vs. heavy load...

INTRODUCTION Professional athletes often check their body composition regularly in order to identify changes that could affect their performance (1). For this reason, various methods have been developed such as the use of skinfold, thickness measurement, bioelectrical impedance analysis (BIA), hydrostatic underwater weighing, and dual energy X-ray...

The purpose of the study was to investigate the effects of power training with light vs. heavy loads during the tapering phases of a double periodized training year on track and field throwing performance. Thirteen track and field throwers aged 16-26 years followed 8 months of systematic training for performance enhancement aiming at two tapering p...

The purpose of the present study was to investigate the effects of 6 weeks strength vs. ballistic-power (Power) training on shot put throwing performance in novice throwers. Seventeen novice male shot-put throwers were divided into Strength (N = 9) and Power (n = 8) groups. The following measurements were performed before and after the training per...

The purpose of the present study was to investigate the effects of 6 weeks strength vs. ballistic-power (Power) training on shot put throwing performance in novice throwers. Seventeen novice male shot-put throwers were divided into Strength (N = 9) and Power (n = 8) groups. The following measurements were performed before and after the training per...

The purpose of this study was to examine the intraseasonal variation of body composition (BC) in elite soccer players. 23 professional players participated in the study. Percentage of body fat (BF) was measured with the use of skinfolds. Measurements were taken monthly from the beginning until the end of the season. Measurement mean values were com...

Introduction: This study compared arm-to-leg bioelectrical impedance analysis (BIA) method and skinfold measurement in estimating the percent body fat (%BF) in male professional soccer players. Methods: Twenty eight healthy professional soccer players (aged 27.4 ± 5.3 years; ht 180 ± 7.0 cm; wt 76.6 ± 6.3 kg; and BMI 23.66 ± 1.5) from division one...