Search results for "Hormoni"
showing 10 items of 107 documents
Recovery of rescuers from a 24-h shift and its association with aerobic fitness.
2017
Objectives: Rescuers work in 24-h shifts and the demanding nature of the occupation requires adequate recovery between work shifts. The purpose of this study has been to find out what kind of changes in autonomic control may be seen during work shift and its recovery period in the case of rescuers. An additional interest has been to see if aerobic fitness is associated with recovery from work shifts. Material and Methods: Fourteen male rescuers (aged 34±9 years old) volunteered to participate in the study. Heart rate variability (HRV) was recorded for 96 h to study stress and recovery, from the beginning of a 24-h work shift to the beginning of the next shift. Aerobic fitness assessment inc…
Dzīvības procesu ķīmiskie regulatori: vitamīni un hormoni
1948
Tulkojums no krievu valodas.
Pre-invasion history and demography shape the genetic variation in the insecticide resistance-related acetylcholinesterase 2 gene in the invasive Col…
2012
Abstract Background Invasive pest species offers a unique opportunity to study the effects of genetic architecture, demography and selection on patterns of genetic variability. Invasive Colorado potato beetle (Leptinotarsa decemlineata) populations have experienced a rapid range expansion and intense selection by insecticides. By comparing native and invasive beetle populations, we studied the origins of organophosphate (OP) resistance-associated mutations in the acetylcholinesterase 2 (AChE2) gene, and the role of selection and demography on its genetic variability. Results Analysis of three Mexican, two US and five European populations yielded a total of 49 haplotypes. Contrary to the exp…
Muscle and bone mass in middle‐aged women : role of menopausal status and physical activity
2020
Background. Women experience drastic hormonal changes during midlife due to the menopausal transition. Menopausal hormonal changes are known to lead to bone loss and potentially also to loss of lean mass. The loss of muscle and bone tissue coincide due to the functional relationship and interaction between these tissues. If and how physical activity counteracts deterioration in muscle and bone during the menopausal transition remains partly unresolved. This study investigated differences between premenopausal, early perimenopausal, late perimenopausal, and postmenopausal women in appendicular lean mass (ALM), appendicular lean mass index (ALMI), femoral neck bone mineral density (BMD) and T…
Postmenopausal hormone replacement therapy modifies skeletal muscle composition and function: a study with monozygotic twin pairs
2009
We investigated whether long-term hormone replacement therapy (HRT) is associated with mobility and lower limb muscle performance and composition in postmenopausal women. Fifteen 54- to 62-yr-old monozygotic female twin pairs discordant for HRT were recruited from the Finnish Twin Cohort. Habitual (HWS) and maximal (MWS) walking speeds over 10 m, thigh muscle composition, lower body muscle power assessed as vertical jumping height, and maximal isometric hand grip and knee extension strengths were measured. Intrapair differences (IPD%) with 95% confidence intervals (CI) were calculated. The mean duration of HRT use was 6.9 ± 4.1 yr. MWS was on average 7% (0.9 to 13.1%, P = 0.019) and muscle…
Active and passive recovery influence responses of luteinizing hormone and testosterone to a fatiguing strength loading
2018
The purpose of this study was to examine the acute hormonal and muscular responses to a strenuous strength loading [bilateral leg press (LP) 10x10 1RM] followed by loading-specific active (AR, n = 7, LP 10x10x30% 1RM) or passive (PR, n = 11, seated) recovery. The subjects were men age: 26±4 years, height: 174±8 cm, body mass: 75±13 kg. After control measurements, experimental measurements were conducted at pre and post loading as well as post recovery and next morning. A significantly higher absolute concentration (p<0.05) of serum luteinizing hormone (LH) was observed in AR than PR at next morning while no differences were observed in serum testosterone (T), cortisol (C) or sex hormone bin…
Liikunnanopettajien asenteet ja tietämys anabolisista androgeenisista steroideista ja kasvuhormonista
1998
Beeta-alaniinin vaikutus 600 metrin juoksuaikaan
2016
Johdanto. Anaerobisessa maksimaalisessa suorituksessa (30 – 90 sekuntia) energia tuotetaan pääasiallisesti anaerobisen glykolyysin kautta, jonka haitallisina aineenvaihduntatuotteina syntyy laktaatti- ja vetyioneja. Näistä kahdesta vetyioni laskee veren pH-arvoa happamampaan suuntaan heikentäen lihassupistusta. Lihaksen ja veren happamuuden puskurointia voidaan parantaa muun muassa erilaisia lisäravinteita käyttämällä. Beeta-alaniinin on havaittu lisäävän solun sisäisen karnosiinin määrää. Karnosiini puskuroi solun sisällä happamuutta aiheuttavia vetyioneja lisäten anaerobista suorituskykyä. Tämän tutkimuksen tarkoituksena on selvittää onko lyhyellä beeta-alaniinin käyttöjaksolla vaikutusta…
Neuromuscular, hormonal and oxidative stress responses to endurance running exercises in well-trained runners
2007
The aim of this study was to investigate to which type of running exercises well trained endurance runners respond more favourably with regard to acute neuromuscular and endocrinological responses and exercise-induced oxidative stress. It was hypothesized that these responses depend on the type of running exercise and relate to the physical characteristics. Altogether nine different running exercises and a long walking exercise were performed by a total of 88 male athletes. An intermittent exercise consisting of progressive 20 s runs decreased vertical jump performance in middle distance runners (MID), but improved it in marathon runners (MAR). An 18 – 24 min exhaustive test run, a 40 min i…