Methods of indirectly determining blood pressure in the rat are reviewed and their drawbacks noted. A new method is described which has the advantage of objectivity and provides permanent graphic record of each determination. The end point used is the reappearance of pulsation in the foot distal to a slowly deflating leg cuff. Application of the method is described and its use compared with tai...

We investigated a non-invasive measurement for changes in finger blood flow during wakefulness and sleep. Changes in finger blood flow, reflected by pulse wave amplitude (PWA) derived from finger plethysmography, were compared with changes in forearm vascular flow assessed by venous occlusion plethysmography after intra-arterial infusion of norepinephrine (NE), phentolamine, and isoproterenol (...

The assessment of sexual arousal and sexual interest patterns have become significant elements in the detection and treatment of sexual disorders. This study investigated whether there was a relationship between sexual interest (utilizing viewing time) and sexual arousal (utilizing plethysmography) in a clinical sample of sexual offenders with diagnosed pedophilic interests. Thirty nine partic...

Whilst the assessment of body composition is routine practice in sport, there remains considerable debate on best tools available, with chosen technique often based upon convenience rather than understanding method and its limitations. The aim this manuscript was threefold: (1) provide an overview common methodologies used within sport to measure composition, specifically hydro-densitometry, ai...

There are various ways of measuring absolute lung volume. These range from measurements derived from chest radiographs to the more common laboratory measurements employing either gas dilution or plethysmography. The principal difference between the latter two methods is that gas dilution techniques measure gas that is in free communication with the airway opening, whilst plethysmography measure...

Calf venous compliance improves with aerobic training and declines with age. Individuals with hypertension often have decreased arterial and venous compliance. Acute high consumption of NaCl may increase net transcapillary fluid filtration in the limbs, but it is unknown if this acutely high NaCl intake will alter non-invasive assessment of calf venous compliance. In humans, assessment of limb ...

BACKGROUND Computerised x-ray planimetry has been advocated as an alternative to body plethysmography and helium dilution for measuring static lung volumes. The accuracy and reproducibility of this method has been assessed in comparison with these standard methods. METHODS Plethysmographic and planimetric measurements of total lung capacity (TLC) and functional residual capacity (FRC) were ma...

Photodetectors Endowing photodetectors with mechanical flexibility and actual functionality are current research issues in developing optoelectronic devices. In article number 2201303, Xiaosheng Fang co-workers report an all-organic self-powered photodetector prepared by all-solution method ultraflexible dual-polarity output, which can be utilized detecting steady biosignals for photo-plethysmo...

The two papers in this issue from the Osler Chest Unit at Oxford University [1, 2] exploit the fact that the breathing pattern in humans is affected in characteristic ways when the pulmonary airways are obstructed. MORRIS et al. [1] examined the latter part of the tidal expiratory flow pattern in patients with varying degrees of airflow obstruction and found that the expiratory time constant co...