Abstract. Gill ventilation, stroke volume and frequency,!~,, 02 utilization and oxygen uptake, and dorsal aortic blood oxygen tension, content, pH and oxygen affinity have been determined uring normoxia and during a range of hypoxic exposures in the sturgeon, Acipenser transmontanus. In air-equilibrated water gill ventilation was 350 ml/kg/min,!!o utilization was 35 40!'i, and oxygen uptake at 15 C was 55 60 ml O2/kg/h. Dorsal aortic blood Po ~ was 90 mm Hg and blood 02 content at a normal pHa of 7.84 was 7.0 voI ";,. Vg fell considerably through a reduction in branchial stroke volume when Pxo: was reduced from 150 to 100 mm Hg. Although,;, utilization remained unchanged, Vo2 was halved, clearly identifying Acipenser as an 02 conformer with a critical 02 tension just below air saturation. At a PIo_ ~ of 60 mm Hg ~/o2 was only 15'),o f that at normoxic levels falling to only 5')o at a Plo ~ of 30 mm Hg. There was no hypoxic bradycardia. There was no repayment of an oxygen debt even after severe hypoxic exposure in Acipenser, and pHa remained unchanged under all experimental conditions, a response incompatible with lactate or succinate production. It is concluded that the sturgeon reduces total energy expenditure during hypoxic exposure, rather than switching from aerobic to anaerobic metabolism. Arterial blood

interval and show their remarkable agreement with numerical experiments, see Fig. 1. We stress the nonlinear origin of the “breathing patterns ” caused by the selection of the ground state depending on the initial data, and by the non-normality of the linearized operator. 1.

Apneustic breathing is an abnormal breathing pattern characterized by a prolonged inspiratory time with an end-inspiratory pause versus a shorter expiratory time.1 The termination of respiration is considered to be controlled by

Abstract-A numerical procedure which allows the convenient exploration of various optimize, tion hypotheses of breathing pattern regulation is described. The method is based on the calculus of variations and uses a novel technique for the automatic evaluation of all required derivatives. Advan

. On return to air, there was an immediate change in breathing pattern; breathing frequency in-creased above air-breathing values, roughly to the same maximum level regardless of the level of CO2 the animal had been previously breathing, and tidal volume re-turned rapidly toward resting (baseline) values

Background: Low Back pain is common clinical condition encountered in a day to day Physiotherapy practice. Very few authors has so far documented changes in breathing patterns in low back pain while performing certain motor control tests. Purpose: The aim of the study was to observe the breathing

devices in healthy controls. In addition, we assessed different breathing patterns in healthy controls with protein markers to analyze the source of the EBC. Methods: EBC was collected from ten subjects using the RTube and ECoScreen Turbo in a randomized crossover design,

reduction of upper airway dead space. METHODS: Sixteen stable COPD patients requir-ing oxygen use at home were enrolled in this prospective study at a tertiary health care center. A nasal mask and a mouthpiece were used, each having a removable one-way valve to direct the breathing pattern. Four

Abstract. This paper shows that variations in breathing patterns broaden heart rate variability (HRV) spectral bands and increase the power amplitude of low-frequency bands. Because of these influences, spectral markers for HRV signals, such as the quotient between spectral power at different

scielo.php?script=sci_serial&pid=1983-1447&lng=pt&nrm=iso Canto DF, Almeida MA. Nursing outcomes for ineffective breathing pat-terns and impaired spontaneous ventilation in intensive care. Rev Gaúcha