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At least 883 records · Page 49Linked to original sources
PubMed1995

[Telemetry during swimming in risk evaluation of heart patients in rehabilitation].

Swimming differs from other forms of exercise due to its additional hydrostatic and thermal burden. It was investigated whether additional pathologic findings in comparison to history and standard exercise tests can be obtained by holter monitoring during swimming. Symptoms and exercise electrocardiogram were compared with the holter ECG during swimming in 125 patients divided into 3 groups with different diagnoses and severity of cardiac diseases. In a considerable percentage of patients ischemic changes and severe rhythm disturbances were found only during swimming with further diagnostic and therapeutic consequences, though patients with moderate and severe angina and with significant ischemic signs in the exercise test were excluded and mainly patients with slight or absent symptoms were evaluated predominantly. Thus, since swimming is a favorite leisure-time occupation also in patients with diseases of heart and circulation, holter monitoring during swimming is of diagnostic importance in the rehabilitation of these patients.

Adult↗
PubMed1978

Fish heart rate telemetry in the open sea using sector scanning sonar.

Real time monitoring of heart rate from free-swimming fish in the open sea has been used in conjunction with high resolution sonar to track plaice and observed the variation in heart rate in relation to environmental parameters. The heart rate can be observed at the same time as the acoustic picture of the sea bed or the midwater volume of sea surrounding the fish.

Acoustics↗
PubMed1978

Effects of telemetry transmitter weight on breeding success in herring gulls.

Dummy ratio-tracking transmitters weighing 10, 30 and 50 g were attached to randomly chosen pairs of breeding herring gulls (Larus argentatus). Breeding success was measured as a function of eggs hatched and chicks fledged. Fewer clutches survived if patients were subjected to more severe treatments (p less than 0.02). Component effects (catching pairs of gulls or increased transmitter weight) were not singularly significant in decreasing clutch success.

Animals↗
PubMedDate not supplied

Telemetry.

Explore the source record for details and available documents.

Animals↗
PubMed1995

Evaluation of the Cosmed K2 telemetry system during exercise at moderate altitude.

The aim of this study was to test the linearity, precision, and accuracy of the measurements made by the K2 system at sea level (SL) and moderate altitude (MA) (barometric pressure = 591.5 +/- 0.5 mm Hg). To minimize the day-to-day biovariability, a testing protocol based on repeated-alternated measures was used at rest and during three levels of submaximal exercice lasting 12 min each, at 25%, 50%, 75% of the peak workload. The measurements of the respiratory parameters were compared with those obtained with a metabolic measurement cart. The results reported in this study show that the K2 system was an accurate and consistent system for oxygen uptake (VO2) measurements at SL. The K2 system was consistent at MA; however, the K2 system significantly overestimated and underestimated the VO2 computations at rest and 25% of the peak workload, respectively. The calculation of VO2 using the K2 system which assumes that RER = 1.00 had specific effects for the calculation of oxygen uptake. The measurements of FEO2 selectively differed from those obtained with the metabolic measurement cart at MA. Therefore, we concluded that the K2 system was an accurate system for VO2 measurements during submaximal exercices (50%-75% of the peak workload) under laboratory conditions at MA (up to 2,000 m).

Adult↗
PubMed1996

Measurement of intraocular pressure by telemetry in conscious, unrestrained rabbits.

PURPOSE: The aim of this study was to develop a system for the continuous recording of the intraocular pressure (IOP) in rabbits maintained in their normal environment. A telemetric system originally designed for the measurement of cardiovascular parameters in unrestrained, conscious laboratory animals was adapted for this purpose. METHODS: Experiments were performed in adult albino female rabbits. The transmitter was placed under the skin in the neck region. Its catheter was tunneled subcutaneously to the superior conjunctival sac and inserted into the midvitreous. Correlation with the IOP in the anterior chamber was performed by pneumatonography measurement and by manometric pressure perfusion in the implanted rabbits. Transitory increase in IOP was induced by a rapid intravenous injection of 20 ml/kg of 5% glucose. Timolol maleate (0.5%) or saline was administered (50 microliters) in the instrumented eye before the intravenous glucose injection. RESULTS: The intraocular catheter remained patent and was well tolerated for at least 2 months. A constant circadian rhythm of IOP was recorded as previously reported. Intraocular pressure measurements were highly correlated to pneumatonographic and to manometric measurements, indicating the accuracy and reliability of the recording system. A significant inhibition of the IOP increases following the intravenous injection of glucose was induced by 0.5% timolol treatment when compared to saline instillation. CONCLUSIONS: The continuous recording of IOP by our telemetric method represents a breakthrough for studying the effect of various pharmacologic agents in conscious, unrestrained rabbits under physiological conditions that have not been possible with previously described methods.

Adrenergic beta-Antagonists↗
PubMed1996

Continuous measurement of intraocular pressure in rabbits by telemetry.

PURPOSE: Intraocular pressure (IOP) is dynamic and can be influenced by the use of tonometers. The authors developed a technique to implant a telemetric pressure transducer to measure IOP continuously in unrestrained rabbits. METHODS: A commercial telemetric pressure transducer was implanted subcutaneously on the dorsal neck, between the scapulae, of pigmented rabbits. A fluid-filled catheter that conducts pressure to the transducer was routed to the orbit subcutaneously and implanted in the anterior chamber through a limbal opening. The transducer measured pressure and broadcast this information by amplitude modulation radio to a receiver in the animal's cage. Data were recorded at a rate of 50 or 100 samples per second for 60 seconds to study transient changes in IOP to tonometry, or for 15 seconds every 2.5 minutes to study circadian behavior of IOP. RESULTS: Intraocular pressure was recorded from seven rabbits for 180 to 370 days. Within 3 to 8 days of implant surgery, IOP began to follow a circadian rhythm: IOP decreased after room lights were turned on at 00:00 CT and increased after they were turned off at 12:00 CT. (The term CT refers to circadian time and begins at 00:00 CT when lights are turned on.) The maximum difference in IOP between light and dark phases ranged from 6.4 mm Hg to 16.6 mm Hg. When the lighting cycle was advanced by 6 hours, the time of nocturnal rise in IOP also advanced, but it did so gradually over 10 to 14 days. CONCLUSIONS: The implanted pressure transducer provides a convenient, preinvasive method to measure and study IOP in unrestrained experimental animals. This technique will be used to study circadian variations in IOP, the effects of environmental stimuli, and the oculohypotensive effects of therapeutic agents.

Animals↗