We used the Polar H10 heart rate monitor with all participants. The chest straps compatible with the Polar H10 heart rate monitor come in multiple sizes to accommodate differently sized individuals. The best-fitting chest strap for all four participants was the small size, which measured 51 cm to 66 cm. Therefore, all participants wore the Polar H10 heart rate monitor on the small-sized chest strap.
Polar h10 heart rate monitor
Manufactured by Polar Electro
Sourced in Finland
The Polar H10 heart rate monitor is a chest-worn device that measures and records the user's heart rate. It is designed to provide accurate and reliable heart rate data for fitness and health monitoring purposes.
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10 protocols using polar h10 heart rate monitor
1
Polar H10 Heart Rate Monitoring
2
Resting Heart Rate Variability Protocol
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For collection of RR intervals participants were in a supine resting position, in a temperature-controlled room set at 20 C. The room was kept dark and quiet, and participants were instructed not to verbalise throughout the measurement and breathe freely at their normal resting rate. Before the 30-min RR interval measurement commenced, an initial 20-min supine rest period was carried out to ensure participants were at complete rest and their heart rates were stable.
To collect the RR intervals participants wore a Polar H10 heart rate monitor with a Pro Strap (Polar Electro Oy, Kempele, Finland), which has been shown to provide strong agreement and comparable RR interval signal quality to conventional ECG devices (Gilgen-Ammann et al. 2019 (link); Schaffarczyk et al. 2022 (link)). The elastic electrodes of the Pro Strap were moistened, and the strap lengthened to fit around the participant’s chest circumference as described by the manufacturer. The RR intervals were acquired at 1000 Hz via the Elite HRV application (Elite HRV, Asheville, NC, USA) on a mobile device positioned directly next to the participant. The RR intervals were then exported as a text file for processing and analysis offline in MATLAB.
To collect the RR intervals participants wore a Polar H10 heart rate monitor with a Pro Strap (Polar Electro Oy, Kempele, Finland), which has been shown to provide strong agreement and comparable RR interval signal quality to conventional ECG devices (Gilgen-Ammann et al. 2019 (link); Schaffarczyk et al. 2022 (link)). The elastic electrodes of the Pro Strap were moistened, and the strap lengthened to fit around the participant’s chest circumference as described by the manufacturer. The RR intervals were acquired at 1000 Hz via the Elite HRV application (Elite HRV, Asheville, NC, USA) on a mobile device positioned directly next to the participant. The RR intervals were then exported as a text file for processing and analysis offline in MATLAB.
3
Predicting VO2max using 3MISP and CPET
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This cross-sectional study was approved by the Institutional Review Board (IRB) of the Industrial Technology Research Institute (IRB No: IRB-APP-F02-106-009). The study protocol included two 3MISP tests (3MISP30s and 3MISP60s) at a given step count (360 steps) with different frequency sequences, and a graded CPET. In this study, a Polar H10 Heart Rate Monitor (Polar Electro Oy, Finland) was used to continuously monitor the heart rate responses of the participants during the CPET and 3MISP tests. The VO2max of the participants was directly measured by CPET to exhaustion on an electromagnetic bicycle ergometer (Excalibur Sport Ergometer, Lode BV, The Netherlands) and cardiopulmonary exercise testing system (Vmax Encore 29 System, VIASYS Healthcare Inc., Yorba Linda, CA, USA). Because there is a significant correlation between the directly measured VO2max value and the heart rate change during the 3MISP tests [30 (link),31 (link)], this study used 3MISP-heart rate (HR) as a predictor of VO2max and combined age, gender, and physical characteristics to establish two VO2max prediction models (the 3MISP30s and 3MISP60s models). To evaluate the reliability and validity of these two VO2max prediction models, this study used the predicted residual error sum of squares (PRESS) cross-validation procedure to verify the models.
4
Measurement of Physical Activity and Heart Rate
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During each 24-h sampling round, physical activity and heart rate (HR) were monitored using a wrist-worn triaxial accelerometer (Actigraph GT9X, ActiGraph Corp, Pensacola, FL, USA) associated with a Bluetooth HR transmitter chest belt (Polar H10 Heart Rate Monitor, Polar Electro Oy, Kempele, Finland). From activity counts registered per minute, data were aggregated per hour to determine fraction of time spent in sedentary, light or moderate-to-vigorous activity.
5
Assessing Climbing Performance and Psychological State
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Day 1 of the intervention consisted of anthropometric measurements, procedure familiarization, and strength tests. Participants completed an easy route with the top rope technique. Prior to the climb, they underwent a hand grip test with a Saehan Spring Hand® dynamometer (Saehan Corporation, Changwon 630-728, South Korea) and completed the FSST and the CSAI-2R.
During the climb, participants wore a Polar A300 watch and Polar H10 heart rate monitor (Polar Electro®, Kempele, Finland). They were instructed to climb at their normal pace. After the climb, they completed the hand grip test, the FSST, and the CSAI-2R again.
During the climb, participants wore a Polar A300 watch and Polar H10 heart rate monitor (Polar Electro®, Kempele, Finland). They were instructed to climb at their normal pace. After the climb, they completed the hand grip test, the FSST, and the CSAI-2R again.
6
Cardiovascular Monitoring During Exercise
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The study consisted of 2 visits to the Active Health Exercise Laboratory at the University of the Highlands and Islands, Inverness, which were conducted a minimum of 3 days apart. Participants were asked to refrain from intense physical activity (24 h), alcohol (12 h), caffeine (6 h), and food (3 h) before arrival at the laboratory for each visit. During visit 1, participants completed 15 minutes of sedentary activities, 10 minutes of cycling, and a treadmill protocol. For visit 2, each participant completed cycling and treadmill-based HIIE protocols. During each of the trials, participants’ HRs were continuously monitored by a Polar H10 heart rate monitor (Polar Electro Oy; criterion measure), Polar OH1, and Fitbit Charge 3.
7
Behavioral Data Collection Protocol for Functional Analysis
8
Stationary Cycling during Monocular Deprivation
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In two visits, participants completed six 10-minute blocks of cycling on a stationary bike separated by 10-minute rest blocks (Finn et al., 2019 (link); Lunghi & Sale, 2015 (link)) during the 2-hour monocular deprivation period (Figure 1 ). Participants wore a Polar H10 heart rate monitor (Polar Electro, Helsinki, Finland) to monitor their heart rate, and they were able to read their heart rate from a mobile app. While they were cycling, participants were asked to maintain their heart rate at 60% maximal heart rate. This maximal heart rate was calculated based on the Tanaka formula (HRmax = 208 – 0.7 × age) (Tanaka, Monahan, & Seals, 2001 (link)). A 1-mile walk test was used to estimate participants’ maximal oxygen consumption (VO2max) (Kline et al., 1987 (link)). VO2max was used to ensure that participants were of average cardiovascular fitness for their age so that the heart rate estimation was valid.
9
Heart Rate Predicts Destructive Behavior
10
High-Intensity Interval Training vs. Continuous Aerobic Exercise for Health
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In brief, the intervention was 6-months in duration. Participants randomized to the exercise training groups were prescribed three aerobic exercise sessions each week-two sessions were directly supervised by a personal trainer, and one was unsupervised. Each exercise session included a five-min warm-up and cool-down and could be completed on the participant's choice of aerobic exercise equipment. Those assigned to the HIIT group completed 10 cycles of 30-s of high-intensity exercise (e.g., 90% of heart rate reserve) alternating with 90-s of low-intensity exercise (e.g., 2-3/10 on the rating of perceived exertion scale 24 ), while the CAET group completed 40 min of moderate-intensity aerobic exercise (e.g., 50%-60% of heart rate reserve). Participants could use A Polar H10 heart rate monitor and Polar A370 Fitness Tracker (Polar Electro Oy) were used to monitor heart rate, and each session was recorded and reviewed by a personal trainer using the Polar Flow App. 25 Participants randomized to the control group were asked to continue with their baseline level of physical activity, and were offered three complimentary exercise training sessions with a personal trainer at the end-ofintervention.
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