Search results for "hormonit"

The effects of exercising in the cold on energy metabolism, skeletal muscle tissue oxygenation and immuno-endocrine responses

2014

Sotilaan fyysinen toimintakyky, immunologiset tekijät ja hormonaalinen tila pitkäkestoisessa taisteluharjoituksessa

2016

Sotilas tarvitsee hyvää fyysistä toimintakykyä kaikissa tilanteissa. Taistelukentän olosuhteet voivat kuitenkin asettaa haasteita toimintakyvyn ylläpidolle ja aiheuttaa sotilaan ylikuormittumista, mikä nähdään muutoksina sotilaan fysiologisissa vasteissa ja kehonkoostumuksessa. Tämän tutkimuksen tarkoituksena oli tutkia sotilaiden immunologisissa ja hormonaalisissa vasteissa sekä kehonkoostumuksessa tapahtuvia muutoksia pitkäkestoisen taisteluharjoituksen aikana ja selvittää fyysisen kunnon yhteyksiä näihin muutoksiin. Varusmiesten (n=49, ikä 20 ± 1 v, pituus 179 ± 7 cm, paino 73,8 ± 7,8 kg; rasvaprosentti 12,6 ± 3,7 %; BMI: 23 kg/m2) fyysinen kunto mitattiin ennen taisteluharjoituksen alku…

Endocrine effects of sauna bath

2020

Sauna bath brings about numerous acute changes in hormone levels, partly akin to other stressful situations, partly specific for sauna. Norepinephrine increases in those accustomed to sauna bath. Sweating increases the production of antidiuretic hormone, and the renin-angiotensin system becomes activated. Of the anterior pituitary hormones, growth hormone (GH) and prolactin (PRL) secretion is increased. Also β-endorphin has been frequently reported to increase, whereas the responses of ACTH and cortisol are variable, probably depending on the type of sauna exposure. Sperm production decreases in particular in sauna-naïve men, but reduced fertility has not been associated with regular sauna …

Serum hormone concentrations and physical performance during concurrent strength and endurance training in recreational male and female endurance run…

2011

To investigate the effects of concurrent strength and endurance training on physical performance and serum hormone levels a total of 32 recreational endurance runners were trained for 18 weeks. Subjects were divided into four training groups separated by the strength training mode and gender. The groups were women’s and men’s combined maximal and explosive strength training group (WME; n=9 and MME; n=9), and women’s and men’s muscle endurance strength training group (WE; n= 8 & ME; n=8). The training was executed in three consecutive periods (I; 10 weeks, II; 4 weeks and III; 4 weeks). The endurance training in all groups was low-intensity (below lactate threshold) running throughout the wh…

Proteiinilisän vaikutus teholajien urheilijoiden veren hormonipitoisuuksiin ja maksimivoimaan 12 vuorokauden harjoittelujakson ja yhden hypertrofisen…

2012

Riittävä proteiinin ja muiden energiaravintoaineiden saanti turvaa elimistön optimaalisten adaptaatioiden kehittymisen harjoittelun seurauksena. Tämän vuoksi erilaiset lisäravinnevalmisteet, erityisesti proteiinilisät, ovat suosittuja urheilijoiden keskuudessa. Harjoittelu ja ravinto aiheuttavat myös muutoksia elimistön hormonipitoisuuksiin. Tämän tutkimuksen tarkoituksena oli selvittää lisätyn proteiinin vaikutuksia jalkojen maksimivoimaan ja veren testosteroni-, kortisoli- ja SHBG -pitoisuuksiin sekä testosteroni-kortisoli -suhteeseen 12 vuorokauden intensiivisen voima- ja nopeusharjoittelujakson aikana sekä erikseen yhden hypertrofisen voimaharjoituksen aikana. Menetelmät. Ryhmien välill…

Vuorokauden eri aikoina suoritetun voimaharjoittelun vaikutus hypertrofiaan ja voimaan

2005

Lind, Markus Harald (2005). VUOROKAUDEN ERI AIKOINA SUORITETUN VOIMAHAJOITTELUN VAIKUTUS HYPERTROFIAAN JA VOIMAAN. Biomekaniikan pro – gradu tutkielma. Liikuntabiologian laitos. Jyväskylän yliopisto. Tutkimuksen tarkoituksena oli selvittää aikaspesifisen voimaharjoittelun vaikutusta lihaksen poikkipinta – alojen ja koko lihaksen volyymin kasvuun sekä maksimaaliseen voimantuottoon. Toinen voimaharjoitteluryhmä (MORNING, n= 13) suoritti voimaharjoittelun aamulla (7.00 – 9.00) ja toinen (EVENING, n= 15) iltapäivällä (16.00 – 18.00). Kolmas ryhmä toimi kontrollina (CONTROL, n= 14). Ennen ja jälkeen aikaspesifisen voimaharjoitusjakson koehenkilöiltä mitattiin antropometriset muuttujat, maksimaal…

Bone growth in pubertal girls : cross-sectional and longitudinal investigation of the association of sex hormones, physical activity, body compositio…

2005

Strong bones are essential to overall health and quality of life. Optimizing peak bone mass during growth is a key strategy in preventing fragility fractures in later life. Understanding the biological process of bone growth and its regulators assumes the greatest importance in realizing this strategy. This study aimed to investigate bone growth in terms of bone size, bone mineral content (BMC) and volumetric mineral density (vBMD) and its relationship with sex hormones, physical activity (PA), body composition and muscle strength in pubertal girls. A total of 258 healthy girls aged 10-13 years were included in the 2-years observational study at baseline. The PA level was assessed using a q…

The Effects of Intensive Weight Reduction on Body Composition and Serum Hormones in Female Fitness Competitors.

2017

Worries about the potential negative consequences of popular fat loss regimens for aesthetic purposes in normal weight females have been surfacing in the media. However, longitudinal studies investigating these kinds of diets are lacking. The purpose of the present study was to investigate the effects of a 4-month fat-loss diet in normal weight females competing in fitness-sport. In total 50 participants finished the study with 27 females (27.2 +/- 4.1 years) dieting for a competition and 23 (27.7 +/- 3.7 years) acting as weight-stable controls. The energy deficit of the diet group was achieved by reducing carbohydrate intake and increasing aerobic exercise while maintaining a high level of…

Aging and systemic hormonal status affects the circulating miR-21, miR-146a and FasL levels

2015

MicroRNAs are small molecules, found in all cell types and body fluids, which most commonly affect negatively to gene expressions by translational repression. Their role in various physiological conditions and diseases has been emphasized during the last twenty years. In our recent studies with postmenopausal monozygotic twin sisters (n=11), we have investigated how different systemic hormonal status affects the levels of specific circulating microRNAs and other molecules related to inflammation and apoptosis, both processes associated with aging. Our results have shown that the systemic levels of miR-21, miR-146a and Fas ligand are lower within the postmenopausal women who are using estrog…

Changes in Self-Reported Physical Fitness, Performance, and Side Effects Across the Phases of the Menstrual Cycle Among Competitive Endurance Athletes

2019

Purpose: To investigate changes in self-reported physical fitness, performance, and side effects across the menstrual cycle (MC) phases among competitive endurance athletes and to describe their knowledge and communication with coaches about the MC. Methods: The responses of 140 participants (older than 18 y) competing in biathlon or cross-country skiing at the (inter)national level were analyzed. Data were collected via an online questionnaire addressing participants’ competitive level, training volume, MC history, physical fitness, and performance during the MC, MC-related side effects, and knowledge and communication with coaches about the MC and its effects on training and performance. …