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The aim of the study is to experimentally compare measured perfusion index values between smartwatch and a medical grade pulse oximeter in healthy subjects at rest and with and without motion artifacts and during exercise.
Perfusion index (PI) is one of the many vital signs monitored to assess the clinical status of a patient. PI is determined from the pulsatile part of the plethysmographic curve, with typical values measured on the fingers ranging from 0.02% to 20%. Although PI is a relatively newly measured parameter, it has already found application in many areas of clinical medicine. For example, continuous measurement of the perfusion index has been used to monitor changes in finger blood flow after finger replantation (surgical reattachment of the finger to the patient's body). As the ability to monitor the perfusion index begins to become part of the monitored parameters of smartwatches, this new feature could be used in situations where the use of finger sensors is not appropriate. However, no comparison of perfusion index measurements between smartwatch and pulse oximeter has been made to date.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Comparison of perfusion index monitoring using a smartwatch and a pulse oximeter | Experimental | Placing the finger pulse oximeter sensor on the left middle finger and placing the Massimo Watch W1 on the volunteer's left wrist (2 cm from the processus styloideus). Four interventions subsequently follow (Resting condition, Movement artifacts and Circulation constriction, Physical Exercise). |
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| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Resting conditions | Other | The volunteers hand is at rest and Perfusion index readings are taken for six minutes from pulse oximeter and smartwatch |
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| Measure | Description | Time Frame |
|---|---|---|
| Comparison of measured perfusion index values between pulse oximeter and smartwatch during different interventions. | The comparison of measured perfusion index values between pulse oximeter and smartwatch during different interventions (Resting conditions, Movement artifacts, Circulation costriction and Physical exercise) will be analyzed. | 1 hour |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Role | Phone | Extension | |
|---|---|---|---|---|
| Simon Walzel, MEng. | Contact | 420724836120 | walzesim@fbmi.cvut.cz | |
| Karel Roubik, Prof. | Contact | roubik@fbmi.cvut.cz |
| Name | Affiliation | Role |
|---|---|---|
| Karel Roubik | Czech Technical University, Fac. of Biomedical Engineering | Study Chair |
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The measured data will be shared publicly in the data repository on web page: https://ventilation.fbmi.cvut.cz/data/
Unlimited from the time of processing complete measured data
Publicly available to everyone
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| ID | Term |
|---|---|
| D015444 | Exercise |
| ID | Term |
|---|---|
| D009043 | Motor Activity |
| D009068 | Movement |
| D009142 | Musculoskeletal Physiological Phenomena |
| D055687 | Musculoskeletal and Neural Physiological Phenomena |
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Interventional prospective single-arm study
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| Movement artifacts | Other | The volunteer periodically spreads his/her fingers and clenches them into a fist, and Perfusion index readings are taken for six minutes from pulse oximeter and smartwatch. |
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| Circulation constriction | Other | The volunteers arm is constricted using a cuff to measure non-invasive blood pressure. The perfusion index value is monitored during the time of cuff pressure and cuff release. The measurement is followed by a 4-minute pause to allow the vascular supply to stabilize. The measurement is repeated three times. |
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| Physical exercise | Other | The volunteer is seated on the exercise bike, rests his forearms on the handlebars and is instructed not to move his arms. The volunteer's heart rate is controlled to increase to 120 beats per minute. For five minutes, the perfusion index is recorded from a pulse oximeter and smartwatch. |
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