[ps2id id=’background’ target=”/]
BACKGROUND
The pneumograph is a device that records the respiratory velocity and force of chest movements during respiration. This device is of value in recording the respiratory movements of the thoracic wall. The electric pneumograph has a flexible electric battery and during the respiratory excursions the flexible battery is charged and the magnitude of the deflections on the recording paper is easily adjusted by means of amplifying circuit of the electrocardiograph.1 The sharp downward movements of the curve indicated by the arrows represent the stage of rapid inward movement of the chest wall against the closed glottis.
The aim of the experiment is pneumographic recordings of respiratory movements along with the effect of drinking water, talking, forced hyperventilation and breath holding.
[ps2id id=’requirements’ target=”/]
REQUIREMENTS
Subjects: Human
Apparatus: Pneumograph
[ps2id id=’procedure’ target=”/]
PROCEDURE
The subject is seated with bare chest. Attach the respiratory transducers around the chest below the armpits and above the nipples. The respiratory transducer must be slightly tight at the point of maximal expiration. Attach the thermister to the subject positioned below the nostril and not touching the face. Read the instructions of each step to understand the procedures and make a note of which step is being recorded on the marker line above the recording chart. The marker is automatically placed each time before the recording. Click the start button and follow the procedures in the lab manual before recording. Hit the stop button after completing each step and before going to the next step. The measurement boxes have three sections-channel number, measurement type and measurement result. Channel 1 records respiration and channel 2 air flows. Choose the channel to measure and the values & units appear on the measurement results.2
[ps2id id=’references’ target=”/][ps2id id=’1′ target=”/]
REFERENCES
-
Nordenstrom B. An electric pneumograph, Acta Radiologica. 1956;46(5):646-9.
-
http://www.angelo.edu/faculty/cadkins/Respiratory%20Movements.doc. Accessed on 24 April 2018.
