Effets d'un entraînement de type sprint sur les réponses catécholaminergiques à l'exercice bref et intense chez des adolescents

IntroductionThe purpose of this study was to evaluate the effect of sprint training on plasma catecholamine concentrations in response to a-6 second-sprint exercise in adolescent boys (GE). Moreover, to judge of the respective effects of training and pubertal maturation, we proposed the same protocol to a control group of adolescents (GT).ResultsHigher performances (P_max) were reported in GE after 6 months but did not change in CG. In response to sprint exercise, no change was found in maximal lactate concentrations (La_max) or in plasma noradrenaline concentrations (NA) in GE and GT. However, higher (A) responses were reported in GE and CG after the 6 seconds-sprint test and no difference was observed in this increase between the groups.ConclusionThese results suggest that in adolescent boys, sprint training may enhance performances but not catecholaminergic responses to short cycle ergometer sprinting.     

Adrenergic signalling between rat taste receptor cells

In taste buds, synaptic transmission is traditionally thought to occur from taste receptor cells to the afferent nerve. This communication reports the novel observation that taste receptor cells respond to adrenergic stimulation. Noradrenaline application inhibited outward potassium currents in a dose-dependent manner. This inhibition was mimicked by the β agonist isoproterenol and blocked by the β antagonist propranolol. The α agonists clonidine and phenylephrine both inhibited the potassium currents and elevated intracellular calcium levels. Inwardly rectifying potassium currents were unaffected by adrenergic stimulation. Experiments using the RT-PCR technique demonstrate that lingual epithelium expresses multiple α (α1a, α1b, α1c, α1d, α2a, α2b, α2c) and β (β1, β2) subtypes of adrenergic receptors, and immunocytochemistry localized noradrenaline to a subset of taste receptor cells. Collectively, these data imply strongly that adrenergic transmission within the taste bud may play a paracrine role in taste physiology.     

间接免疫荧光法检测特异性IgG抗体对流行性出血热诊断意义

本文报告用间接免疫荧光法检测特异性IgG抗体对流行性出血热的诊断意义。53例不同病期的出血热患者的血清,其间接荧光抗体的阳性率为49/53(占92.45％)。有77.36％的患者血清,检出IgG抗体的时间是在发病后的1～2周。血清中IgG的滴度与疾病的严重性无密切相关。另25例非EHF患者,其血清特异性IgG抗体均为阴性。可见检测特异性IgG抗体对EHF的诊断颇为有用。     

酶联免疫吸附试验、间接荧光抗体试验、间接免疫过氧化物酶染色试验诊断人体旋毛虫病的初步研究

用ELISA、IFA和IIP试验检测11例旋毛虫病人血清特异性抗体,阳性率分别为72.72％、81.82％和81.82%。它们之间无统计学差异,3项试验结果间存在良好一致性。 同时检测了30份健康献血员血清和20例其他寄生虫病人血清(包括华支睾吸虫病、四川肺吸虫病、日本血吸虫病、包虫病和阿米巴肝脓肿),旋毛虫病人组的ELISA、IFA和IIP阳性率明显为高。 由于3项免疫学试验均具有较好的特异性和灵敏性,故可以单独或联合用于人体旋毛虫病的诊断和流行病学调查。