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adrenaline/väsimus

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Leht 1 alates 85 tulemused

[Effects of adrenaline and various alpha type sympatholytic substances on muscle fatigue and contraction].

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Adrenaline improves endurance of rabbit gastrocnemius: a study with continuous high frequency stimulation.

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Beta adrenoceptor agonists are well known for their potentiating effects on peak twitch and tetanic tension and defatiguing effects on skeletal muscles. Adrenaline (ADR) is one of these agonist which is known for inotropism but less described for fatigue. In addition, studies on high frequency

Studies on the nature of sweat gland 'fatigue' in the goat.

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1. The nature of the ;fatigue' of sweating that occurs in the goat upon exposure to environmental conditions of 40 degrees C/26 degrees C (dry bulb/wet bulb) has been examined.2. Heat exposure activated all the sweat glands and the decrement in sweating which occurred was due to a decline in the

[Studies on fatigue and shift work in nurses].

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Effects of shift work on physiological parameters and autonomic nervous-adrenal system were studied on six hospital nurses. Their body temperature, heart rate, blood pressure, fluctuation in ECG R-R intervals, serum catecholamines and cortisol, and subjective fatigue ratings before and after day,
The changes in mental workload and fatigue during a one-day transcribing task were examined by determining some subjective and physiological measures which reflect mental activity. With an interval of one week between the three test days, 12 male students rested and performed self-paced transcribing

Effects of adrenaline on excitation-induced stimulation of the sodium-potassium pump in rat skeletal muscle.

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Experiments were performed on isolated rat soleus and extensor digitorum longus (EDL) muscles of 4-week-old rats. In the soleus, direct electrical stimulation for 10 min induced a frequency-dependent increase in the ouabain-suppressible 86Rb+ uptake, which was maximal (+110%) at a frequency of 2 Hz.

Membrane excitability and excitation-contraction uncoupling in muscle fatigue.

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High-frequency tetanic stimulation is associated with an increase in extracellular and T-tubular K(+) and changes of Na(+) and Cl(-) concentrations, membrane depolarization as well as inactivation of voltage-gated Na(+) channels. These alterations are expected to lead to fiber inexcitability, which

[Catecholamines, their precursors and metabolites in human fatigue after exertion].

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Alterations in metabolism of catecholamines were studied in sportsmen after development of acute fatigue as a result of the test physical loading. Three types of the alterations were characterized on the basis of differences in excretion with urine of free and sulphate-bound adrenaline,
Circadian rhythms in urinary catecholamine excretion, performance and self-ratings were studied in two experiments with a total of 29 subjects who were deprived of sleep for 72 hr. Adrenaline excretion and fatigue ratings showed the most consistent circadian variations; noradrenaline and performance

Disturbed neuroendocrine-immune interactions in chronic fatigue syndrome.

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The present study was designed to investigate the interaction between neuroendocrine mediators and the immune system in chronic fatigue syndrome (CFS). We examined the sensitivity of the immune system to the glucocorticoid agonist dexamethasone and the beta2-adrenergic agonist terbutaline in 15
Myalgic encephalomyelitis or chronic fatigue syndrome (ME/CFS) is a debilitating disorder linked to diverse intracellular infections as well as physiological stress. Cytotoxic lymphocytes combat intracellular infections. Their function is attenuated by stress. Despite numerous studies, the role of

The traditional drug Gongjin-Dan ameliorates chronic fatigue in a forced-stress mouse exercise model.

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BACKGROUND Gongjin-Dan is a representative traditional Oriental medicine herbal drug that has been used to treat chronic fatigue symptoms for several hundred years. We evaluated the anti-fatigue effects of Gongjin-Dan and the underlying mechanisms in a chronic forced exercise mouse

Potassium, Na+,K+-pumps and fatigue in rat muscle.

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During contractile activity, skeletal muscles undergo a net loss of cytoplasmic K(+) to the interstitial space. During intense exercise, plasma K(+) in human arterial blood may reach 8 mm, and interstitial K(+) 10-12 mm. This leads to depolarization, loss of excitability and contractile force.
The β-adrenergic receptor stimulation improves endurance in fast twitch muscles and these effects are sensitive to extracellular Ca2+ influx. Present study is aimed to determine the effects of adrenaline, with different concentrations of extracellular Ca2+[Formula: see text],
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