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At least 1,315 records · Page 73Linked to original sources
PubMed1996

The ambulatory measurement of posture, thigh acceleration, and muscle tension and their relationship to heart rate.

We compared the relative ability of continuous accelerometric, electromyographic (EMG), and hydrostatic posture measurements to discriminate tasks involving variations in motor activity and posture and to predict heart rate (HR) variability. EMG was a more sensitive measure than accelerometry in differentiating the tasks. However, accelerometry and EMG explained comparable amounts of HR variance. The hydrostatic posture was a stable measure that clearly differentiated postures and explained a significant amount of HR variance but less than accelerometry or EMG. Accelerometric and EMG measures of motor activity used either alone or in combination with the hydrostatic posture are valuable in discriminating activities and in controlling for the effects of motor activity and posture on HR during ambulatory measurement.

Adult↗
PubMed1987

Progressive central hypovolaemia in man--resulting in a vasovagal syncope? Haemodynamic and endocrine variables during venous tourniquets of the thighs.

Hypotensive functional haemorrhage induced by venous pooling of blood in the legs has been reported to be characterized by a vasovagal reaction. In the present study these observations were extended by determination of the hormonal profile developed during progressive central hypovolaemia and an emotionally induced vasovagal syncope. In six subjects venous pooling resulted in normotensive central hypovolaemia, in one subject hypotensive central hypovolaemia was induced, and one subject experienced an emotionally induced vasovagal syncope. During normotensive central hypovolaemia heart rate increased from 58 +/- 4 to 76 +/- 4 beats min-1 (P less than 0.05) and cardiac output fell from 6.1 +/- 0.4 to 4.1 +/- 0.2 1 min-1. Pulse pressure and central venous pressure decreased from 64 +/- 4 to 53 +/- 4 mmHg, and from 8 +/- 2 to 3 +/- 2 mmHg, respectively. Adrenaline and noradrenaline increased from 87 +/- 10 to 120 +/- 20 pg/ml and from 196 +/- 33 to 370 +/- 50 pg/ml, respectively. Angiotensin II increased from 13 +/- 4 to 36 +/- 6 pg/ml and aldosterone from 63 +/- 9 to 180 +/- 27 pg/ml. In hypotensive central hypovolaemia the decrease in mean arterial pressure was accompanied by a decrease in heart rate and increments in the plasma concentrations of pancreatic polypeptide, indicating increased vagal activity and beta-endorphin, while plasma noradrenaline was unchanged. In emotionally induced syncope heart rate decreased to cardiac arrest for 13 s, associated with increments in the plasma concentrations of pancreatic polypeptide and beta-endorphin. It is concluded that normotensive functional haemorrhage in man is associated with increased sympathetic activity and that the qualitatively similar observations obtained during an emotionally and a hypovolaemic-induced hypotensive episode indicate that the hypotensive functional haemorrhage is characterized by a vasovagal reaction.

Adult↗
PubMed2004

Giant lipomas: a series of 12 consecutive cases and a giant liposarcoma of the thigh.

BACKGROUND: The clinical presentation and character of giant lipomas create diagnostic problems because of their close relationship with other mesenchymal benign and malign tumors. It is therefore of primary importance for the clinician to be familiar with epidemiologic and anatomic attributes of these lesions. OBJECTIVE: To evaluate and compare epidemiologic and clinical characteristics of giant lipomas operated in our clinic. METHODS: Twelve giant lipomas and one giant liposarcoma are included in the study. RESULTS: There were seven females and six males. The patients ranged in age between 22 and 75. The tumor duration was between 2 months and 40 years. The smallest lipoma size was 10x5x3 cm, and the largest was 19x9x5 cm. Two of the lipomas were located intermuscular. Mild hematoma formation was observed in two patients. Histopathologic evaluation was done for all specimens, and one myxoid liposarcoma was encountered. CONCLUSION: When dealing with giant lipomas, liposarcomas should always be included in the differential diagnosis.

Adult↗