Jan Gajewski

Jan Gajewski
Józef Piłsudski University of Physical Education in Warsaw | AWF · Chair of Human Biology

Ph.D. technical sciences, D.Sc. sport sciences

About

69
Publications
37,371
Reads
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521
Citations
Citations since 2016
30 Research Items
415 Citations
2016201720182019202020212022020406080
2016201720182019202020212022020406080
2016201720182019202020212022020406080
2016201720182019202020212022020406080
Additional affiliations
February 2009 - October 2021
Józef Piłsudski University of Physical Education in Warsaw
Position
  • Professor (Associate)
October 1997 - February 2009
February 1994 - September 1997
Józef Piłsudski University of Physical Education in Warsaw
Position
  • Research Assistant
Education
January 1996 - October 1997
September 1977 - September 1982
Warsaw University of Technology
Field of study
  • Faculty of Power and Aeronautical Engineering, Applied mechanics, robotics, biomechanics

Publications

Publications (69)
Article
Full-text available
The aim of the study was to define the changes of the characteristics of physiological postural tremor under conditions of increasing fatigue and lack of sleep during prolonged military training (survival). The subjects of the study were 15 students of the Polish Air Force Academy in Dęblin. The average age was 19.9±1.3 years. During the 36-hour-lo...
Article
Full-text available
The aim of the study was to compare the changes in tremor after two exercises. Twelve male kayakers and seventeen male PE students participated in the study. The kayakers performed a specific kayak ergometer test. The students performed bilateral elbow flexion/extension with a barbell. Tremor was measured accelerometrically pre-exercise and then 10...
Article
Full-text available
Study aim: to evaluate the differences in H-reflex parameters in lying and standing positions in canoeists. Material and methods: twenty seven male canoeists (age 17.2 ± 1.6 year, body mass 73.7 ± 7.6 kg, height 180.9 ± 6.1 cm, training experience 6.5 ± 3.6 years) participated in the study. None of the subjects had any history of neuromuscular diso...
Article
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The aim of the study was to estimate post-competition changes in handgrip strength and blood lactate in climbers and relationships of the studied variables with declared climbing ability of the tested athletes. Twenty one male climbers volunteered to take part in the experiment. Each subject took part in simulated lead climbing competition on the a...
Article
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Purpose: The aim of this study was to identify the determinants of peak power achieved during vertical jumps in order to clarify relationship between the height of jump and the ability to exert maximum power. Methods: One hundred young (16.8±1.8 years) sportsmen participated in the study (body height 1.861 ± 0.109 m, body weight 80.3 ± 9.2 kg)....
Article
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The most common symptoms of post-COVID-19 condition in children are fatigue, shortness of breath, exercise intolerance, and weakness. The post-COVID-19 condition in children can be very debilitating and lead to prolonged school absences, high morbidity, and limitations in daily functioning. The aim of this research project is to determine the effec...
Article
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Esports offer a unique opportunity to conduct human performance studies, as they use modern hardware and software as an operation platform. Insights on gameplay and underlying processes may push the development of new and optimal practice methods. The aim of this study was to investigate performance indicators from in-game data to predict the outco...
Article
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Purpose: The aim of the study was to analyse the contrary body movement in Viennese waltz performed by dancesport athletes and to determine its relationship on scores awarded by the adjudicators. Methods: Six high-level and six intermediate dance couples took part in the study. Each couple performed three identical series of three natural turns fig...
Article
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The sports landscape is constantly changing due to innovation and entrepreneurship. The availability of technology led to the emergence of esports and augmented sports. Biofeed-back and sensing technologies can be used for athlete monitoring and training purposes. Research on motor control deals with planning and execution of bodily movements and p...
Preprint
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As a relatively new form of sport, esports offers unparalleled data availability. Despite the vast amounts of data that are generated by game engines, it can be challenging to extract them and verify their integrity for the purposes of practical and scientific use. Our work aims to open esports to a broader scientific community by supplying raw and...
Article
Background: The programming of training protocols within a high-intensity interval training (HIIT) framework with appropriate analysis of total training load could deliver optimal training adaptations. This study aims to compare the efficiency of two low-volume HIIT protocols integrated with the regular training regime in professional soccer playe...
Article
Purpose: The aim of our study was to assess the influence of asymptomatic flatfoot on the kinetic parameters of the lower limb during gait. Methods: Individuals of both sexes were studied: 15 women [age 25 ± 5 years] and 19 men [age 25 ± 4 years] with bilateral asymptomatic flatfoot, as well as 16 women [age 26±4 years] and 14 men [age 24 ± 3 years...
Article
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The purpose of this study was to examine the effects of a 6-month high- or moderate-intensity total-body circuit training (CT) program on physical fitness in prepubertal soccer players. Sixty-seven prepubertal boys with a mean age of 11.2 ± 0.7 years completed the study. Participants from a soccer academy were randomly assigned either to a high-int...
Article
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Stiffness, the resistance to deformation due to force, has been used to model the way in which the lower body responds to landing during cyclic motions such as running and jumping. Vertical, leg, and joint stiffness provide a useful model for investigating the store and release of potential elastic energy via the musculotendinous unit in the stretc...
Article
W artykule poruszono zagadnienia związane ze zjawiskiem fizjologicznego drżenia mięśniowego, które z różnym natężeniem występuje u wszystkich ludzi bez wyjątku. Opisano wpływ czynników zewnętrznych (tj. używek, zmęczenia, niedoboru snu) na fizjologiczne drżenie mięśniowe. W przypadku wzmożonego drżenia mięśniowego może wystąpić ograniczenie zdolnoś...
Preprint
Full-text available
Esports offer a unique opportunity to conduct human performance studies, as they use modern hardware and software as an operation platform. Insights on gameplay and underlying processes may push the development of new and optimal practice methods. The aim of this study was to investigate performance indicators from in-game data to predict the outco...
Article
Introduction and objective: Performing indoor and outdoor work in cold environments may result in various adverse effects on human health and may lead to increased risk of respiratory infection. The aim of this study was to determine the relation of vitamin D status to secretory immunoglobulin A concentration, leucocyte counts, cytokine concentrat...
Article
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Background: There is paucity of data examining the effectiveness of long-term Hatha yoga-based (HY) programs focused on the health-related fitness (H-RF) of asymptomatic, sedentary women. The purpose of this study was to examine the effects of a 6-month HY-based training program on H-RF components in sedentary middle-aged women. Methods: Eighty...
Article
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Purpose: The aim of the study was to investigate the relationships between shuttlecock velocity during a badminton forehand smash with and without jump (VmaxWJ and VmaxNJ), strength of upper limb muscles, vertical jump height and to analyze differences in these parameters for each gender. Methods: The study examined members of the Polish Nationa...
Article
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O estudo objetivou comparar indicadores de saúde, incluindo o conceito de saúde (CS), nível de atividade física (NAF) e dados antropométricos, de alunos de ensino médio de escolas particular, estadual e federal na cidade de Leopoldina – MG, Brasil. A amostra foi composta por 388 estudantes, sendo 205 meninos (idade: 16,6 ± 1,0 anos) e 183 meninas (...
Article
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Objectives: The study aim was to determine if a difference exists in skinfold thickness measured by two interchangeable approaches; (1) supraspinale skinfold recommended in the Heath-Carter method and (2) iliac crest skinfold measurement. The question arises as to whether each approach has a similar or different effect on endomorphy determination,...
Article
Objective: To present the use of Posterior Trunk Symmetry Index (POTSI) and Anterior Trunk Symmetry Index (ATSI) for the assessment of the coronal plane trunk symmetry in children; to compare the two measures in individual subjects and to evaluate the possible association of each measure with gender and age (<6 vs. >6 years). Methods: Trunk photogr...
Article
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The aim of the study was to investigate changes of strength and power of the lower extremities in adolescent handball players during a two-year training cycle. Thirty-one male handball players (age 16.0 ± 0.2 years, body mass 81.4 ± 9.7 kg, body height 188.2 ± 6.4 cm) took part in this study. All tests were conducted three times at the beginning of...
Article
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The aim of this study was to evaluate the relationship of a wide range of anthropometric parameters with BMD in normal-weight women: handball players and healthy untrained students. Thirteen former female handball players, (age 21.2±0.9 years, body mass 64.2±6.1 kg, training experience 6.7±2.4 years) and 51 randomly selected untrained students (age...
Preprint
Full-text available
Purpose: The study aims to identify the determinants of peak power achieved during vertical jumps in order to clarify relationship between the height of jump and the ability to exert maximum power. Methods: One hundred young (16.8±1.8 years) sportsmen participated in the study (body height 1.861±0.109 m, body weight 80.3±9.2 kg). Each participant p...
Article
Full-text available
Purpose: The main goal of the present study was to examine muscle strength and power of dominant and non-dominant leg, knee extensors and flexors, and their correlations with jumping performances in soccer players. A secondary aim was to evaluate muscle sense. Methods: 31 male professional strikers (age 20.9 ± 2.3 years, body mass 75.1 ± 6.6 kg,...
Article
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This study aimed to investigate the acute effect of skydiving and the chronic effect of parachute jump training on the cardiac response in novice and trained parachuters. The study included 11 experienced skydivers (expert group), aged 35.9 ± 7.2 years, and 12 students (novice group), aged 27.9 ± 7.2 years. Participants underwent 10-unit training i...
Article
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The purpose of this exploratory study was to evaluate opinions of elite athletes, coaches and classifiers regarding the International Wheelchair Basketball Federation’s (IWBF) functional classification system. We were also interested in the athletes’ perspective regarding potential changes to the classification system. In addition, we compared the...
Article
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The aim of this study was to analyse the effectiveness of new haematology parameters related to reticulocytes and mature red blood cells to differentiate pre latent and latent iron deficiency. The study included 219 female athletes (aged 15-20 years) representing volleyball, handball, cycling, canoeing, cross-country skiing, swimming and judo. To a...
Article
The aim of this study was to examine the association between ACE and ACTN3 genes, independently or in combination, and muscle strength and power in male and female athletes. The study involved 398 young male (n=266) and female (n=132) athletes representing various sport disciplines (ice hockey, canoeing, swimming, volleyball). All were Caucasians....
Article
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Hoffmann’s reflex (the H-reflex) is an electrically-induced reflex that is analogous to the mechanically-induced stretch reflex controlled by the spinal cord. The most common measurements performed concerns the electrical response of the soleus muscle to electrical stimulation in the tibial nerve. The response is induced by a discharge occurring in...
Article
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The main aim of the study was to design a new system to measure punching and kicking forces as well as reaction times in combat sport athletes. In addition, the study examined whether there were any intergender differences in the force of punches thrown by boxers and kicking forces delivered by taekwondo athletes. Boxers (male, n = 13; female, n =...
Article
Full-text available
The main aim of the study was to design a new system to measure punching and kicking forces as well as reaction times in combat sport athletes. In addition, the study examined whether there were any intergender differences in the force of punches thrown by boxers and kicking forces delivered by taekwondo athletes. Boxers (male, n = 13; female, n =...
Article
Full-text available
Purpose. The aim of this study was to determine the changes in postural physiological tremor following maximum intensity effort performed on arm ergometer by young male and female swimmers. Methods. Ten female and nine male young swimmers served as subjects in the study. Forearm tremor was measured accelerometrically in the sitting position before...
Article
The aim of this study was to assess whether functional exercise improved postural stability and body composition in female subjects over 60 years of age. METHODS: Thirty women participated in this study, after being medically qualified for a 3-month functional exercise program. They underwent a series of tests twice, once before starting this funct...
Article
The purpose of this study was to examine the association between ACTN3 R577X polymorphism and physical abilities of male athletes performing various sports (volleyball, ice hockey, canoeing, swimming). One hundred and eighty-five subjects were recruited for the study. The following measurements were taken: height of jump and power output in counter...
Article
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Background and objective: The main purpose of this study was to examine the association between ACTN3 R577X polymorphism and the ability to produce peak power in young male athletes from various sports. Our hypothesis was that the ACTN3 R577X polymorphism is associated with jumping performance and athletes with RR genotype have better scores in te...
Article
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The aim of the study was to examine the possible relationship between I/D polymorphism of ACE gene and selected indices of aerobic capacity among male and female athletes practising winter endurance sports. Sixty-six well-trained athletes (female n=26, male n=40), aged 18.4 ± 2.8 years, representing winter endurance sports (cross-country skiing, n=...
Article
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Study aim: The aim of the present study was to determine a strength profile which characterizes young male athletes from different sports and to use the method of allometry to synthetically evaluate the muscular strength with respect to body mass. Material and methods: The study included 85 men who practiced taekwondo (8 subjects), 20 judoists, 10...
Article
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Study aim: To determine and compare the muscle strength profile and muscle strength symmetry of kayakers and canoeists. Material and methods: A total of 36 male participants participated in the study, including 25 kayakers and 9 canoeists. Measurements of maximum muscle torque were taken under static conditions for 10 muscle groups: flexors and ext...
Article
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Streszczenie Wstęp: Dotyk obecny jest w każdym obszarze życia człowieka. Za jego pośrednictwem ludzie odbierają i poznają otaczający ich świat, komunikują emocje i tworzą silne więzi. Dotyk jest istotnym elementem każdej relacji, a szczególnie relacji fizjoterapeuta - pacjent, gdyż jest on jednym z podstawowych narzędzi, jakimi fizjoterapeuta posłu...
Article
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The aim of the study was to examine age-related differences in the maximal power and height of rise of the body’s centre of mass, measured in the counter-movement jump (CMJ) and the spike jump (SPJ), between elite cadet, junior and senior female volleyball players. The study was conducted on elite cadet (n=39), junior (n=8) and senior (n=23) female...
Article
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The purpose of this study was to examine the diversity of white blood cell (WBC) counts and their subsets (neutrophils, lymphocytes and monocytes) among competitive athletes of different sports disciplines. The blood samples were collected from 608 healthy, medically examined athletes (181 females and 427 males) aged 20.1 ± 5.1 years, who represent...
Article
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The goal of the study was to determine a strength profile in young female athletes practising different sports and to use allometry to evaluate muscular strength with respect to body mass. The study included 42 women who practised taekwondo (n = 10), weightlifting (n = 10), canoeing (n = 14) and speed skating (n = 8). Measurements of maximal muscle...
Article
Brain CT scans and neurological condition were evaluated in 74 stroke patients. Firstly, we found that using a classification-tree technique based on CT scan parameters (an innovative method, analyzing four parameters simultaneously) coincided with our previously proposed kinematic artificial neural network (ANN) classification technique for 71.3%...
Article
Full-text available
Somatic Profile of Competitive Sport Climbers Since rock climbing grows in popularity, the number of the respective scientific reports increases. However, those concerning anthropometric profile of elite climbers are scarce and inconsistent, thus the aim of the study was to describe the anthropometric characteristics of competitive sport climbers....
Article
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Background: The aim of the study was to examine gender differences in the maximal power and height of rise of the body mass centre, measured in ACMJ (akimbo counter movement jump), BCMJ (bounce counter movement jump) and CMJ (counter movement jump) and maximal muscle torque in elite swimmers who have a similar training load during the season. Mater...
Article
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The study attempts to assess gait symmetry based on measurement of vertical component of ground reaction force (GRF) in lower limbs. The aim of the study was to compare the results of gait classification obtained by means of artificial neural networks (ANN) and authors' own quantitative index method. Twenty male and twenty female physiotherapy stud...
Article
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Young people who study physical education are a priori regarded as having proper body structure and body composition. This assumption cannot be confirmed in the subject literature. To determine the basic auxological parameters in youth who study physical education. 235 first-year students studying physical education were examined: 32% women (n=74)...
Article
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Resulting from the interaction between environmental and genetic factors differences in somatic potentials that manifest in different body size and body proportions may decide of children's motor skills and predispositions. Determination of morphological conditioning of physical fitness facilitates a more rational control of physical education proc...
Article
Purpose: The aim of this study was to evaluate wheelchair basketball skills in athletes representing the different functional classification levels and various types of disabilities. Materials and methods: One hundred nine athletes from the Polish and Lithuanian national wheelchair basketball leagues participated in the study. Six standardized skil...
Article
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Aim: The purpose of this study was to assess the aerobic fitness of elite female wrestlers, and to determine whether there are gender differences in the physiological response to graded exercise. Materials and Methods: Ten female and ten male freestyle wrestlers volunteered for the study. They all performed a graded exercise test on the treadmill u...
Article
The aim of this study was to assess the usefulness of administering food supplements to male weightlifters (n = 13), members of the Polish National team, while on a training camp. The intakes of energy, protein, fat, carbohydrates, selected minerals (Ca, P, Mg, Fe, K, Zn, Cu) and vitamins (A, C, E, B 1, B2, B6, B12 and niacin) were assessed from 24...
Article
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Purpose. The purpose of the study was to reveal a possible relationship between maximal gripping force and climbing ability as well as to compare a decrease in handgrip force caused by training session in male and female climbers. Basic procedures. Seventy-four climbers (49 males and 25 females) took part in a climbing session on artificial wall. G...
Article
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In this study, the authors assess the strength of proximal humerus fracture fixation using different methods. The strength, while pulling out the chosen single Kirschner wires implanted in porcine bone, has been examined. Tests concerning the strength of fixation with different types of implants have been carried out on prepared models. We observed...
Article
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The aim of this study was to detect possible relationships between cortisol and testosterone concentrations and the exercise-induced changes in tremor. Twelve male kayakers, members of the National Team were subjected to routine physiological tests and tremor measurements. Specific kayak ergometer tests consisted of 3 submaximal bouts of increasing...
Article
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Background. In most sports disciplines, the level of training and the capacity for exertion is dependent on the anabolism of proteins. For this reason there has been growing interest in supplements, especially hydroxymethylobutyrate (HMB). The purpose of our research was to test the impact of isometric training and HMB supplementation on muscle str...
Article
The aim of the study was to compare the changes in tremor after two exercises. Twelve male kayakers and seventeen male PE students participated in the study. The kayakers performed a specific kayak ergometer test. The students performed bilateral elbow flexion/extension with a barbell. Tremor was measured accelerometrically pre-exercise and then 10...
Article
Interrelationships between forearm tremor and a number of body dimensional, muscle structure, muscular strength and training background variables were studied among 13 male students with athletic backgrounds. The subjects performed isometric dominant upper extremity elbow flexions with a 90 degrees joint angle and with the forearm held in a horizon...
Article
Human tremor amplitude has been shown to be sensitive to fatigue offering a measure for neuro-muscular functioning. In the present study effects of adaptation to strength training on fatigue-induced changes in tremor amplitude were studied in nine male subjects participating in a five-week training program comprising 13 training units of bilateral,...
Article
The effects of knee joint angle (muscle length) and spring load stiffness on some mechanical parameters of lower leg tremor were studied among twelve male subjects during isometric knee extensions against three springs differing in stiffness at knee angles of 90, 110, and 130 degrees. The power spectral density function was estimated for the accele...