This study was conducted to establish the relationship between a new bioelectrical parameter, total body capacitance (TBpF), as an expression of body cell mass, measured using an impedance analyser and basal metabolic rate (BMR), by indirect calorimetry in 75 healthy subjects (38 females and 37 males, aged between 13 y and 43 y). A significant high correlation was found between TBpF and BMR (r = 0.992, SEE = 238 kcal) with the equation: BMR (kcal day-1) = Capacity (pF) x 2.29.

Adolescent↗

PubMedDate not supplied

[Cardiovascular and respiratory reflex responses due to stimulation of muscle nerve receptors and experimental physical exercise].

The cardiovascular and respiratory reflex effects brought on by the infection into the femoral artery of bradyquinine and of hypertonic sodium chloride solutions and by rhythmic muscular work and muscular work of tetanic type induced by low and high frequency electrostimulation in the muscles have been investigated in the rear extremity anaesthetized rabbits. Intra-arterial injection of bradyquinine and rhythmic muscular contractions trigger off cardiovascular reflux effects of inhibitory type represented by a reduction in arterial pressure, heart frequency and vascular resistances of the rear extremity controlateral to the one stimulated. Intra-arterial injection of hypertonic NaCl and tetanic contractions cause opposite effects, namely of decidedly excitatory type. Such responses are not substantially altered by complete removal of the skin layer of the stimulated extremity. The neuromuscular block obtained with curare-like substances does not affect chemical stimulation responses, whereas it eliminates similar effects caused by experimental muscular work. The experiments carried out show that injection into the muscular arteries of chemical agents of various type produces varying cardiovascular reflex effects as a result of activation of chemosensitive nervous receptors located in the muscular tissue, and also that during physical exercise similar reflex modifications are produced, very probably caused by stimulation of receptors present in the contracting muscles.

Animals↗