Gerasimos Grivas

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 y) were divided into a serial combined (SCG), an integrated combined (ICG), or a control...

Forest Recreation is focused on the investigation of forests as destinations for recreation activities. Theory 􀊉f Planned Behavior (TPB) is applied to recreational exercise. There are not many surveys that use this theoretical model. They are mainly focused on quantitative methods of research including activities like walking, biking, jogging, runn...

Η δασική αναψυχή επικεντρώνεται στη διερεύνηση της επιρροής των δασών ως προορισμός αναψυχής. Το μοντέλο της Θεωρίας της Σχεδιασμένης Συμπεριφοράς (ΘΣΣ) έχει εφαρμογή στην άσκηση αναψυχής και περιλαμβάνει ελάχιστες έρευνες, οι οποίες χρησιμοποιούν ποσοτικές μεθόδους έρευνας και αφορούν δραστηριότητες όπως περπάτημα, ποδηλασία, τρέξιμο και ορειβασία...

Forest recreation concentrates on the research of the forestall influence as a recreational destination. The purpose of the present study was to shed light on the perceptions-expectations, social influence and control beliefs related to exercising in the forest. Semi-structured individual interviews were realized according to the instructions and t...

Τα παγκόσμια ρεκόρ τόσο στους άνδρες όσο και στις γυναίκες από το αγώνισμα των 5 km μέχρι και τον μαραθώνιο δρόμο έχουν καταρριφθεί μετά την εισαγωγή στην παραγωγή του παπουτσιού με την πλάκα του άνθρακα (CFP) το 2016. Αυτή η σταδιακή βελτίωση της επίδοσης, συμπίπτει με τις πρόσφατες εξελίξεις στην τεχνολογία παπουτσιών που αυξάνουν τις ελαστικές ι...

The coronavirus disease (COVID-19) pandemic has had an unprecedent impact on the world of sport and society at large. Many of the challenges with respect to integrity previously facing competitive sport have been accentuated further during the pandemic. Threats to the integrity of sporting competition include traditional doping, issues of technolog...

Introduction The period of basic military training (BMT) is a sudden change in the individual habits of the trainees and is characterized by significant improvements in body composition such as the percentage of body fat (%BF) and lean body mass (BM). Research has shown that physical activity during the period of BMT lasting 7–10 weeks has positive...

53 μαθητές (26 αγόρια, 27 κορίτσια) γυμνασίου που συμμετείχαν στο μάθημα, και αντίστοιχα 27 δευτεροετείς φοιτητές (11 αγόρια και 16 κορίτσια) του ΤΕΦΑΑ Τρικάλων που δίδαξαν το μάθημα, στο πλαίσιο του μαθήματος της διδακτικής της Φυσικής Αγωγής. Συγκεκριμένα σε τρεις τάξεις μαθητών γυμνασίου των 17, 18, 18 ατόμων αντίστοιχα, διδάχτηκε μία φορά ένα μ...

Detraining is the reduction of performance that happens after the cessation of training and is reflected by anatomic and physiologic changes. The purpose of this study was to investigate the effects of reduce training on cardiovascular parameters in distance runners. Many studies showed reduce of VO2 max and anaerobic threshold after detraining. On...

Stretching has long been considered an integral part of the training routine for athletes and is used across all disciplines as a tool of preparation, performance enhancement and injury prevention. According to the literature there are two main types of stretching that middle and long distance athletes’ use, static and dynamic. Static stretching me...

The purpose of this study was to perform a systematic review and summarize the current literature regarding L-carnitine and the potential role of sports especially in distance athletes. L-carnitine is a naturally occurring compound that plays an important role in mitochondrial β-oxidation. The main role of L-carnitine is to promote weight loss by i...

The purpose of this qualitative research study was to examine the perceptions of 2nd year undergraduate students, regarding lesson satisfaction and learning achievement, following their participation in one session of the invasion game of team handball that was structured and presented according to the principles of the Game Sense model. The sample...

The purpose of this study was to perform a systematic review determine the effects of tapering on performance in elite endurance runners. The taper is a key element of the physical preparation of athletes in the weeks before a competition and it seems that the most important variable for maximize performance is training volume, training frequency a...

Vitamin D can be synthesized endogenously by exposing the skin to UVB radiation of the sun (Deldicque & Francaux, 2015). Also, low vitamin D status has been linked to various cardiovascular diseases, hypertension and certain types of cancer (Halliday et al., 2011). Athletes have similar risk factors for vitamin D deficiency as the rest of the popul...

The purpose of this study was to perform a systematic review and meta-analysis of controlled trials to determine the effect of strength-training programs on the running economy (RE) of high-level middle- and long-distance runners. Four electronic databases were searched in September 2015 (Pubmed, SPORTDiscus, MEDLINE and CINAHL) for original resear...

Several oxidant stressors have been repeatedly employed in the field of free radical biology to perturb redox homeostasis. Most of these oxidant stressors are of pharmacological nature and produce toxic effects, limiting their use to cells and animals. Hence, the development of a physiological oxidant stimulus applicable to humans would be useful i...

Despite the progress of analytic techniques and the refinement of study designs, striking disagreement exists among studies regarding the influence of exercise on muscle function and redox homeostasis in the elderly. The repeated eccentric exercise model was applied to produce long-lasting and extensive changes in redox biomarkers and to reveal mor...

Background Previous studies from our group have shown that "pure" eccentric exercise performed on an isokinetic dynamometer can induce health-promoting effects that may improve quality of life. In order to investigate whether the benefits of "pure" eccentric exercise can be transferred to daily activities, a new and friendlier way to perform eccent...

A novel automatic escalator was designed, constructed and used in the present investigation. The aim of the present investigation was to compare the effect of two repeated sessions of stair descending versus stair ascending exercise on muscle performance and health-related parameters in young healthy men. Twenty males participated and were randomly...

This study investigates whether vitamin E can attenuate eccentric exercise-induced soleus muscle injury as indicated by the amelioration of in situ isometric force decline following a low-frequency fatigue protocol (stimulation at 4 Hz for 5 min) and the ability of the muscle to recover 3 min after the termination of the fatigue protocol. Adult mal...

Twenty males ran either on a level treadmill (nonmuscle-damaging condition) or on a downhill treadmill (muscle-damaging condition). Blood and urine samples were collected before and after exercise (immediately after, 1h, 4h, 24h, 48h, and 96h). The following assays were performed: F(2)-isoprostanes in urine, protein carbonyls in plasma, glutathione...

Exercise-induced arterial hypoxemia (EIAH), characterized by decline in arterial oxyhemoglobin saturation (SaO(2)), is a common phenomenon in endurance athletes. Acute intensive exercise is associated with the generation of reactive species that may result in redox status disturbances and oxidation of cell macromolecules. The purpose of the present...

Training volume in middle and distance running events is one of the most important elements for improving performance that has not been adequately researched. The aim of the present study was to investigate the running distances (training volume) the athletes cover to improve aerobic and anaerobic performance during the yearly training periods. Dat...

Detraining is the reduction of performance that happens after the cessation of training and is reflected by anatomic and physiologic changes. The purpose of this study was to investigate the effects of training cessation on cardiorespiratory deconditioning in adolescent middle and long distance runners. Fourteen track and field athletes (aged 14- 1...

Η δύναμη στους δρόμους ημιαντοχής-αντοχής φαίνεται να διαδραματίζει σημαντικό ρόλο στη βελτίωση των επιδόσεων. Η πιο πάνω ικανότητα αποκτά μεγαλύτερη αξία όσο αυξάνεται η ταχύτητα διάνυσης της αγωνιστικής απόστασης στους δρόμους αυτούς. Έτσι, όσο μεγαλύτερη είναι η αγωνιστική ταχύτητα ενός δρομέα, τόσο μεγαλύτερο και πιο αποφασιστικό ρόλο διαδραματ...