Blood Volume

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VPG data

Measure variations in blood flow indirectly via changes in opacity with the plethysmogram transducer for tethered, wireless and MRI applications.

Typically, a blood volume pulse (BVP) transducer—otherwise known as a pulseplethysmogram or photoplethysmogram (PPG) transducer—is attached to the finger or toe to record the peripheral pulse. AcqKnowledge® will calculate measurements on a beat-by-beat basis.

  • Pulse rate (heart rate)
  • Amplitude
  • Pulse wave area (indication of blood volume)

PPG (Pulse Plethysmogram) and BVP (Blood Volume Pulse) are two names for very similar measurements. BVP is the signal that results when highpass filtering the PPG signal. The choice of highpass filter is a bit arbitrary, but typically it is a value between 0.05 Hz and 0.5 Hz.

The situation is very similar to EDA. In this case there is tonic EDA which is the entire EDA signal. And the highpass filtered version of tonic EDA is phasic EDA which isolates the specific delta responses at a certain point in time. BVP is metaphorically equivalent to phasic EDA. PPG is similarly equivalent to tonic EDA.

Changes in the PPG baseline are indicative of the overall amount of blood in the capillary bed.

  • Increases in BVP amplitude indicate vasodilation of the capillary bed (parasympathetic response)
  • Decreases in BVP amplitude indicate vasoconstriction of the capillary bed (sympathetic response)

Please note that the VPG (Vaginal Photoplethysmogram) is identical to the PPG but designed to measure capillary blood flow/presence in the vaginal wall.

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Hardware Packages   |   Blood Volume

Hardware Bundles are complete solutions for the specified application. Choose your preferred platform and bundle, then click "Request Pricing" to request an estimate, add/remove items, or complete purchase. If you have questions about specific items, click through to the product web page for details and specifications, or contact your Local Sales contact.

Wired

MP36R System for Pulse measurement

  • 1 x MP36R Systems
  • 1 x Photoplethysmogram for Pulse Waveform - MP3X/45

MP160 System with PPG amp and finger transducer

  • 1 x MP160 Data Acquisition Systems
  • 1 x Photoplethysmogram Transducers
  • 1 x Photo Plethysmogram Amplifier

Wireless

BioNomadix Logger for EDA & PPG

  • 1 x BioNomadix Wireless Wearable Physiology Logger
  • 1 x Electrode Leads - BioNomadix Wireless
  • 1 x EDA Electrodes
  • 1 x Electrode Gel, Isotonic, 114 g

MP160 System plus wireless PPG with Pulse transducer

  • 1 x MP160 Data Acquisition Systems
  • 1 x Wireless Pulse Transducers - BioNomadix
  • 1 x BioNomadix Wireless PPG and EDA Amplifier

MRI

MP160 System with PPG amp & finger transducer for MRI

  • 1 x MP160 Data Acquisition Systems
  • 1 x Photo Plethysmogram Amplifier for MRI
  • 1 x Photoplethysmograph Transducer for MRI

Animal

MP36R System for Pulse measurement

  • 1 x MP36R Systems
  • 1 x Photoplethysmogram for Pulse Waveform - MP3X/45

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