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1

Acute Endocrine Responses to Different Strength Exercise Order in Men

100%

da Conceição R. R., Simão R., Silveira A. L. B., e Silva G. C., Nobre M., Salerno V. P., Novaes J.

Journal of Human Kinetics

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2014

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vol. 44

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issue 1

111-120

EN

This study compared the effects of order of muscle groups’ exercised (larger to smaller muscles vs. smaller to larger muscles) on the acute levels of total testosterone, free testosterone and cortisol during resistance training (RT) sessions. Healthy male participants (n=8; age: 28.8 ± 6.4 years; body mass: 87.0 ± 10.6 kg; body height: 181.0 ± 0.7 cm; BMI: 26.5 ± 4.1) were randomly separated into two experimental groups. The first group (LG-SM) performed an RT session (3 sets of 10 repetitions and a 2 min rest period) of the exercises in following order: bench press (BP), lat pulldown (LP), barbell shoulder press (BSP), triceps pushdown (TP) and barbell cut (BC). The second group (SM-LG) performed an RT session in following order: BC, TP, BSP, LA, BP. Blood was collected at the end of the last repetition of each session. Control samples of blood were taken after 30 min of rest. Significant differences were observed in the concentrations of total testosterone (p < 0.05), free testosterone (p < 0.0001) and cortisol (p < 0.0001) after both RT sessions in comparison to rest. However, when comparing LG-SM and SM-LG, no significant differences were found. The results suggest that, while RT sessions induce an acute change in the levels of testosterone and cortisol, this response is independent of the order of exercising muscle groups.

2

Effects of creatine hydrochloride supplementation on physical performance and hormonal changes in soldiers

100%

Tayebi M. M., Yousefpour M., Ghahari L.

Physical Activity Review

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2021

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vol. 1

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issue 9

93-99

EN

Purpose: The aim of this study was to examine the effects of 2 weeks of creatine hydrochloride (CrHCl) supplementation on physical performance and hormonal changes in army soldiers. Materials: Eighteen male army soldiers were randomly assigned in a double-blind fashion to either a CrHCl (n=9) or placebo (Pl) (n=9) groups. CrHCl group costumed 3g of creatine per day, whereas Pl group was given dextrose. Before and after supplementation period, the subjects performed a battery of performance tests including one repletion maximum (1RM) of bench press and back squat, vertical jump (VJ) and Wingate anaerobic test. In addition, blood samples were obtained to determine changes in testosterone and cortisol concentrations per and post supplementation. Results: There were significant increases in VJ, peak and mean power, and 1RM back squat test following the 2 weeks of CrHCl supplementation (p < 0.05) without any significant change for the Pl group. In addition significant changes were observed in testosterone and cortisol concentrations from before to after supplementation in CrHCl group (p < 0.05) and compared with Pl group (p=0.001). Conclusions: In conclusion, the present study indicates that CrHCl supplementation can improve VJ, power performance, 1RM back squat and hormonal changes in army soldiers.

3

Tips for optimizing organ preservation solutions

100%

Ostróżka-Cieślik A., Dolińska B., Ryszka F.

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2018

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vol. 65

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issue 1

9-15

EN

Organ injury during ischemia is one of the clinical problems of today's transplantation. It occurs during warm ischemia time (WIT) when the blood flow is cut off and during cold ischemia when a graft is chilled in situ until the circulation is restored to the recipient organism. Fast cooling of the organ slows down metabolism and activates intracellular enzymes, which minimizes the effects of warm ischemia. Unfortunately, hypothermia also results in inhibition of ATP synthesis, cell swelling and intracellular acidity. That is why research is continually being conducted to develop new fluids for rinsing and storing organs, as well as to optimize the composition of those that are already in use, which will allow for longer and more effective graft storage and restoration of their optimal functions after transplantation. This article provides current information on rinsing and storage fluids available on the global market. It also discusses tips for the fluid modifications with hormones and micronutrients.

4

Evaluation of the Psychological and Hormonal Parameters in Paragliding

100%

Çalık D. S., Gürsoy R., Saruhan E.

Central European Journal of Sport Sciences and Medicine

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2021

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vol. 34

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issue 2

15-23

EN

Background. Paragliding is an extreme sport performed by gliding from a mountain at high altitude into the air. The authors aimed to determine the differences between the levels of adrenaline, cortisol, and insulin before and after the flight of tandem pilots and passengers flying for the first time, and to determine the relationship between these hormones and death anxiety and risk-taking levels. Materials and methods. The study included 12 experienced male pilots and 15 male passengers flying for the first time. Heart rate and blood pressure were measured after the participants had filled in Personal Information Form, DOSPERT Risk-Taking Scale and Death Anxiety Scale before the flight. Blood samples were taken before and after the flight to determine adrenaline, cortisol, and insulin levels. Results. Adrenaline and cortisol levels, as well as heart rate, increased significantly after the flight, while insulin levels decreased significantly in the passenger group (p < 0.05). There were no statistically significant differences in the pilot group. Conclusions. The experience factor plays an important role in the positive effect of paragliding flight on cortisol, adrenaline, insulin, and various physiological parameters, as well as mediates the adaptation of the organism to unusual situations. The human organism adapts physiologically and hormonally to the flying action. One of the striking results of the study was that cortisol levels were at the upper limit of normal values in the passenger group after the flight.

5

The Influence of a 7-Week Preparatory Period on Hormonal and Metabolic Responses in Soccer Players / Metabolic and Hormonal Response to Training

88%

Opaszowski B. H., Tyc Z., Obmiński Z., Danielik T., Korkuć M., Długołȩcka B.

Polish Journal of Sport and Tourism

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2012

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vol. 19

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issue 3

178-183

EN

Introduction. The aim of the study is to evaluate the metabolic and hormonal response of soccer players to maximum effort (test for determining anaerobic threshold changes - PPA) carried out under field conditions within a training cycle, which included a preparation period of about 7 weeks. Materials and methods. In blood samples of the 20 subjects the concentrations of lactate was determined, (LA) in whole blood, also including cortisol (C), testosterone (T) and growth hormone (GH) in blood plasma, during a running exercise performed according to the formula for determination of PPA. The heart rate (HR) was recorded during the running exercise. Threshold speed was determined based on OBLA. The tests were carried out twice: at the beginning and at the end of the seventh week preparatory period. Results. The training increased the threshold speed by an average of 0.4 m/s, lower concentrations of LA during the second test and less severe changes in HR. Endurance of the tested athletes increased at more favourable hormonal response with respect to cortisol nd and GH. The endurance component in the training, in the 2nd test resulted in lower resting testosterone levels, which did not affect the metabolic balance. The ratio of testosterone to cortisol (T/C), its growth after the period of training, showed a more stable anabolic-catabolic balance, which justifies the validity of the training assumptions in this period. Conclusions. The study confirmed the usefulness of metabolic-endocrine indicators in the monitoring the physiological response of athletes to exercise, as well as beneficial changes in the process of adaptation of bodies of athletes subjected to training.

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Czy cechy osobowości i aktualny status hormonalny determinuje w przyszłości osiągnięcia sportowe łuczników i łuczniczek?

63%

Obmiński Z., Mroczkowska H.

Polish Journal of Sports Medicine

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2020

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vol. 36(2)

57-64

PL

Wstęp. Celem naszego badania było poszukiwanie możliwych relacji między wybranymi cechami osobowości a obecnym stanem hormonalnym we krwi (kortyzol i testosteron) wśród młodych łuczników i łuczniczek płci w podobnym średnim wieku (~ 16,4 lat) i ich osiągnięciach sportowych (SA) w przyszłości. Materiał i metody. Poranne stężenie kortyzolu we krwi (C) i testosteronu (T) oraz wybrane cechy osobowości określono u 19 łuczników i 19 łuczniczek. 16 lat po tym badaniu zebrane wcześniej dane zostały przeanalizowane w odniesieniu do (SA) wyrażonych ocenę numeryczną do zakończenia kariery. Wyniki. Nie było istotnych między-płciowych w wynikach: lęku jako cechy (An), neurotyczności (Ne), ekstrawersji (Ex), żwawości (Br), perseweratywności (Pe), wrażliwości sensorycznej (SS), reaktywności emocjonalnej (ER), wytrzymałości (En), aktywności (Ac) i C. U kobiet An, Ne i ER dodatnio korelują z SA. U mężczyzn SA nie zależał od jakiejkolwiek cechy osobowości, podczas gdy T ujemnie korelował z An i Ne a dodatnio z Br. Wnioski. U młodych łuczników nie ma znaczących różnic w cechach osobowości związanych z płcią, ale ta teza ma ograniczoną wartość ze względu na małą wielkość próbki. Zakładając, że u młodych sportowców osobowość nie jest zbyt stabilna, zaleca się krótkoterminowe rokowanie dotyczące osiągnięć sportowych w przyszłości.

EN

Background. The intent of our study was to seek possible relationships between selected personality traits and the current hormonal status in blood (cortisol and testosterone) among young male and female archers of similar average age (~16.4 years) and their sport achievements (SA) in a future. Material and methods. Morning blood cortisol (C) and testosterone (T) levels and selected personality traits were determined in19 male and 19 female archers. 16 years after the study the data were analyzed with regards to the (SA) expressed by numerical rating and achieved until the end of their career. Results. There were no significant differences between the males and females in scores of examined: trait anxiety (An), neuroticism (Ne), extraversion (Ex), briskness (Br), perseveration (Pe), sensory sensitivity (SS), emotional reactivity (ER), endurance (En), activity (Ac) and C. In females An, Ne and ER correlated positively SA. In males SA was independent on any personality trait, while T correlated negatively with An and Ne and positively with briskness. Conclusions. In young archers there is no significant sex-related differences in personality traits, but this thesis is of limited value because of small sample size. Assuming that in young athletes the personality is not very stable, there are recommended short-term prognosis regarding sport achievements.

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Użyteczność wybranych wskaźników krwi i ocena odczuwanego zmęczenia po wyczerpującym wysiłku fizycznym dla oszacowania całkowitego kosztu biologicznego meczu piłki nożnej

51%

Obmiński Z.

Polish Journal of Sports Medicine

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2020

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vol. 36(3)

123-129

EN

Background. The aim of the study was to examine changes in biochemical blood status during recovery after soccer match in the order to estimation of physiological cost of the effort. Material and methods. The study comprised 17 players engaged in a friendly soccer match against the foreign team. The coach wanted to examine the level of technical skills, endurance, and cooperative abilities each of the selected player, and blood biochemical responses to the match based on cortisol (C), testosterone (T), T/C ratio, creatine kinase (CK), glucose (Glu) and urea (U) assessments in capillary blood sampled at three time points: a day -32h prior the match, and subsequently at +12h and +32h after its. Results. The biochemical status was not depended on the plying position of the players. Mean post match (+12h) CK -519 U/L) and U -6.6 mmol/L were somewhat higher compared to those at baseline:359 U/L and 5.9 mmol/L, and showed tends to their normalization at +32h. Mean Glu significantly dropped after the match (from 5.6 to 5.1 mmol/L) and did not fully return to the baseline value after 32h recovery. Mean C and T at +32h were practically unchanged, but T/C ratio was higher from pre and post match values. Conclusions. Lowered post match Glu and its lack of full normalization over 32h recovery and it is main symptom of the physiological cost of the effort. During competitive season soccer played have to apply more carbohydrate-enriched diet.

PL

Wstęp. Celem pracy było zbadanie zmian w biochemicznym statusie krwi podczas odnowy po meczu piłki nożnej w celu oszacowania kosztów fizjologicznych tego wysiłku. Materiał i metody. Badaniem objęto 17 zawodników grających towarzyski mecz piłki nożnej przeciwko drużynie zagranicznej. Trener chciał zbadać poziom umiejętności technicznych, wytrzymałość, umiejętności współpracy każdego z wybranych graczy, oraz reakcje biochemicznych wskaźników, kortyzolu (C), testosteronu (T), stosunek T/C, kinazy kreatynowej (CK), glukozy (Glu) i mocznika (U)we krwi kapilarnej pobieranej w trzech punktach czasowych: -32h przed meczem, a następnie w +12h i +32h po jego zakończeniu. Wyniki. Status biochemiczny nie zależał od pozycji zawodników na boisku. Średnia wartość po meczu (+12h) CK -519 U/L) i U -6,6 mmol/l były nieco wyższe w porównaniu z wartościami wyjściowymi:359 U/L i 5,9 mmol/l, i wykazały tendencję do normalizacji w terminie +32h. Średnia Glu znacznie spadła po meczu (z 5,6 do 5,1 mmol / l) i nie w pełni powrócić do wartości wyjściowej po w 32 godzinie wypoczynku odzysku. Średnie C i T w 32h po meczu były praktycznie niezmienione, ale stosunek T/C był wyższy od wartości przed i po meczu. Wnioski. Obniżony po meczu poziom Glu i jego brak pełnej normalizacji po 32h wypoczynku jest głównym objawem fizjologicznych kosztów wysiłku. Podczas sezonu startowego w piłce nożnej zawodnicy powinni stosować wysoko - węglowodanową dietę.

Refine search results

Acute Endocrine Responses to Different Strength Exercise Order in Men

Effects of creatine hydrochloride supplementation on physical performance and hormonal changes in soldiers

Tips for optimizing organ preservation solutions

Evaluation of the Psychological and Hormonal Parameters in Paragliding

The Influence of a 7-Week Preparatory Period on Hormonal and Metabolic Responses in Soccer Players / Metabolic and Hormonal Response to Training

Czy cechy osobowości i aktualny status hormonalny determinuje w przyszłości osiągnięcia sportowe łuczników i łuczniczek?

Użyteczność wybranych wskaźników krwi i ocena odczuwanego zmęczenia po wyczerpującym wysiłku fizycznym dla oszacowania całkowitego kosztu biologicznego meczu piłki nożnej