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Modifications to an optocardiographic method for measurement of heart rate in a range of invertebrate species

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Author(s): W.J. Van Aardt | A. Vosloo

Journal: African Zoology
ISSN 1562-7020

Volume: 31;
Issue: 3;
Date: 2011;
Original page

Keywords: Heart rate | Invertebrate species

ABSTRACT
A non-invasive technique developed by Depledge & Andersen (1990) on a crab and a lamellibranchiate wasused in this study to measure heart rate activity in a millipede, centipede, spider, two scorpion species, two crabspecies, three insect species and the garden snail. A novel technique to confine smaller arthropods in an aluminiumfoil bag provided with a 7 mm by 7 mm opening allowed heart rate measurements to be done on spid~rs,insects, centipedes and scorpions without direct body contact of the probe. For the crab and the garden snail aplastic device to hold the reflective optocoupler (ROC) probe was glued externally over the heart region. Theamplitude of the heart rate signals in 1 mm depth water as medium was about 8% less than those In 1 mm of air.Four millimetres of water as medium reduced the amplitude signal by 90% when compared to zero thickness.With 4 mm of air as medium the amplitude signal decreased by 80%. The erroneous electronic circuit diagrampublished by Depledge & Andersen (1990) is corrected and redrawn.
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