Search for dissertations about: "photoplethysmography"

Showing result 1 - 5 of 12 swedish dissertations containing the word photoplethysmography.

2. 1. Photoplethysmography : methodological studies and applications

   Author : Lars-Göran Lindberg; Linköpings universitet; []
   Keywords : MEDICINE; MEDICIN;

   Abstract : Photoplethysmography (PPG), an optical non-invasive technique for measuring skin perfusion changes, was investigated and evaluated. The method was compared with laser Doppler flowmetry (LDF) when measuring perfusion changes in human fingers and forearms. READ MORE

4. 2. Non-invasive measurement of skeletal muscle blood flow using by photoplethysmography. Experimental studies on the human leg

   Author : Qiuxia Zhang; Göteborgs universitet; Göteborgs universitet; Gothenburg University; []
   Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; photoplethysmography; skeletal muscle blood flow; perfusion pressure; intramuscular pressure; venous obstruction; muscle exercise; non-invasive; limb elevation; vibration exposure; hyperaemia; foot pump.;

   Abstract : The purpose of this thesis was to validate a new non-invasive photoplethysmography (PPG) method for measuring relative changes in local muscle blood flow (MBF) in the human leg. Experimental conditions expected to impede or increase local MBF were used to test responsiveness of the PPG. READ MORE

5. 3. Acupuncture - effects on muscle blood flow and aspects of treatment in the clinicla context

   Author : Margareta Sandberg; Björn Gerdle; Lars-Goran Lindberg; Thomas List; Linköpings universitet; []
   Keywords : MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Acupuncture; muscle blood flow; non-invasive; photoplethysmography; fibromyalgia; pain; postmenopausal symptoms; psychological distress; Physiotherapy; Sjukgymnastik fysioterapi;

   Abstract : The overall aim of this thesis was to elucidate and investigate psychophysiological aspects and effects of acupuncture and needle stimulation. Within this framework emphasis was directed toward the effects of needle stimulation (acupuncture) on muscle blood flow in the tibialis anterior and trapezius muscles in healthy subjects and patients suffering from chronic muscle pain. READ MORE

6. 4. Preventing pressure ulcers by assessment of the microcirculation in tissue exposed to pressure

   Author : Sara Bergstrand; Margareta Lindgren; Anna-Christina Ek; Maria Engström; Lars-Göran Lindberg; Fredrik Huss; Linköpings universitet; []
   Keywords : MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Pressure ulcer; photoplethysmography; laser Doppler flowmetry; non-invasive; tissue blood flow; reactive hyperemia; pressure-induced vasodilation; interface pressure; risk assessment;

   Abstract : The overall aim of this thesis was to combine optical methods into a system with the ability to simultaneously measure blood flow changes at different tissue depths. The goal of such a system was to reveal vascular mechanisms relevant to pressure ulcer etiology under clinically relevant conditions and in relation to the evaluation of pressure-redistribution support surfaces. READ MORE

7. 5. Respiratory monitoring using reflection mode photoplethysmography : clinical and physiological aspects

   Author : Lena Nilsson; Robert Hahn; Linköpings universitet; []
   Keywords : MEDICINE; MEDICIN;

   Abstract : Photoplethysmography (PPG) is a non-invasive optical technique for monitoring variations in blood volume and blood flow in skin and other tissues. Light from a light-emitting diode is absorbed, scattered and reflected from the skin, and detected by a photodetector as a plethysmogram. The plethysmogram contains variations of different frequencies. READ MORE