The HRV was acquired using a H10 chest strap (Polar Inc., Kempele, Finland) and recorded using a RS800CX monitor (Polar Inc., Kempele, Finland). This wireless device was placed below the participant’s chest muscles, allowing a reliable recording [32 (link)].
H10 chest strap
Manufactured by Polar Electro
Sourced in Finland
The H10 chest strap is a heart rate sensor designed for use in various fitness and sports applications. It is capable of accurately measuring the user's heart rate and transmitting the data wirelessly to compatible devices.
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Lab products found in correlation
9 protocols using h10 chest strap
1
Wireless HRV Monitoring Protocol
2
Cardiorespiratory Capacity Assessment in Cancer Patients
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To record the cardiorespiratory capacity, maximum heart rate and the patients' perception of effort, the Bruce incremental submaximal test (modified) [73 (link)] will be performed on a treadmill. During the test, the patients will wear a Polar H10 chest strap to monitor their heart rate. Thus, following the protocol created by Bruce, the treadmill will start with a 0% incline and a speed of 1.7 m/h which will be maintained during the first 3 min. Every 3 min both the speed and the incline will be increased until the participants decide that their fatigue is too high to continue. In addition to constant heart rate monitoring to record the maximum heart rate, the patient will be asked about her perception of exertion every minute. By acquiring the maximum heart rate we can then prescribe the target intensity from the reserve heart rate using Karvonen's formula [74 (link)]. At the end of the test, the recovery heart rate will be recorded 1 min after stopping the test in order to assess the recovery rate. Subsequently, the maximum oxygen consumption of each patient (VO2max = 2.282* (time) + 8.545) will be calculated from the formula proposed by the creators. This submaximal test has been commonly used in cancer patients in different exercise interventions [75 (link)].
3
Cardiovascular Responses Measurement
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A Polar H10 chest strap (Polar Electro QY 2017) was used to collect the participants’ cardiovascular responses, namely heart rate (HR) and the Root Mean Squared of Successive Differences (RMSSD), which is a heart rate variability (HRV) index. RMSSD is the main time-domain HRV index because it reflects beat-to-beat acute stress changes in HR (Laborde et al. 2017 (link)).
4
Triadic Cooperation: Experimental Task
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The study received approval as low-risk research from the Human Research Ethics Advisory Group of the Faculty of Science and Technology at Deakin University in Australia. After participants signed the written informed consent, they wore the Polar H10 chest strap on their upper rib cage (following the H10 wearing guidelines [21 ]). Triads were randomly seated in front of the computers with new identifications assigned as Alpha, Bravo, and Charlie. Subsequently, participants watched a video explaining the rules and objectives of the task. Following the instruction video, participants completed a 1 min practice trial. These procedures were aimed at getting the teams familiarised with the task. The experimental task consisted of four trials with each trial lasting 11 min; Figure 1 b shows the estimated time of the total experiment. Participants completed NASA-TLX questionnaires at the end of each trial and the post-experiment cooperation questionnaires at the end of the simulated task [18 ].
5
Multimodal Physiological Signals Synchronization
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Each participant put their index finger over a smartphone camera, which recorded a video. For each frame in the video stream, we record its capture time and three numbers: r, g, b, which are the average values of red, green, and blue components of the frame pixel colors. Each participant was simultaneously wearing the Polar H10 chest strap. After each measurement was complete, the RR intervals detected by the Polar device during the measurement were collected. Each dataset record consists of the following arrays:
Time: moments of camera frame capture times in milliseconds elapsed from the measurement start;
R, G, B: arrays of numbers r, g, b for all captured frames;
RR: sequence of RR intervals collected from the Polar device during the measurement.
6
Smartphone-Based Photoplethysmography Dataset
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This is a newly introduced dataset. It is publicly available at https://github.com/Welltory/welltory-ppg-dataset (accessed on 1 July 2021). The dataset consists of 21 records containing three time series: red, green, and blue channel PPG signals, and simultaneously collected RR intervals. RR intervals were collected using a Polar H10 chest strap and manually examined by an expert to ensure their accuracy. PPG data were obtained via a smartphone camera using the Welltory app. Signal lengths vary from 68 to 112 s.
7
Multimodal Physiological Monitoring Protocol
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Participants’ breathing rate was measured using a respiratory inductance plethysmography (RIP) belt from Plux S.A. and a BITalino (r)evolution board (Batista et al., 2017 (link)). The heart rate of the participant was recorded by a Polar H10 chest strap, which extracts R–R intervals (i.e., the time between consecutive R-waves of the QRS electro cardiac signal). Both physiological recording units broadcasted their data to a Raspberry Pi 4 Model B, which was also used to calculate the breathing biofeedback scores with custom-made python software, based on the open source EEGsynth library (Brammer et al., 2021 (link); Oostenveld, n.d. ).
8
Longitudinal Cardiovascular Monitoring
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To collect medium-term HRV data, participants will wear a Fitbit Charge 5 smartwatch for a total of 6 weeks. The HRV-B itself will be conducted using a Polar H10 chest strap for 10 min two times per day. This connects via Bluetooth to the Elite HRV smartphone app, which is downloaded to participants’ phones. Participants will aim to increase their HRV score as displayed in Elite HRV in real time using a diaphragmatic breathing technique (figure 1 ). Omron M2 blood pressure monitor (endorsed by the British Hypertension Society) will be used to conduct NLT in clinic and the adapted Autonomic Profile (aAP).27 (link)
9
Validating Heart Rate Sensors for Sleep Monitoring
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We used two POLAR® sensors (POLAR® Electro Oy, Kempele, Finland): the H10 chest strap (Model: 1W) as well as the Verity Sense (VS, Model: 4J), an optical (photoplethysmography: PPG) heart-rate sensor, to measure the participants’ heart-rate continuously during sleep. Both sensors are affordable (link),34 (link),35 (link)].
We used the NUKKUAA™ App for the sleep training program that recently has been developed as a Spin-Off from the University of Salzburg for Android and iOS mobile devices. During the sleep training study, only the H10 was used to capture sleep objectively. The H10 was connected to the user’s own smartphone and the NUKKUAA™ App via Bluetooth. Participants were instructed to start each recording by pressing the “Go to sleep” button on the home screen just before sleep and stop it accordingly upon awakening in the morning using the “Wake up” button.
We used the NUKKUAA™ App for the sleep training program that recently has been developed as a Spin-Off from the University of Salzburg for Android and iOS mobile devices. During the sleep training study, only the H10 was used to capture sleep objectively. The H10 was connected to the user’s own smartphone and the NUKKUAA™ App via Bluetooth. Participants were instructed to start each recording by pressing the “Go to sleep” button on the home screen just before sleep and stop it accordingly upon awakening in the morning using the “Wake up” button.
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