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How do I increase productivity on my Apple Watch? 

Standard deviation
Intensity (physics)
Intraclass correlation
Cross-sectional study
Heart rate

Answers from top 8 papers

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Papers (8)Insight
Open access•Journal Article•DOI
Accuracy of Apple Watch Measurements for Heart Rate and Energy Expenditure in Patients With Cardiovascular Disease: Cross-Sectional Study.
Maarten Falter, Werner Budts, Kaatje Goetschalckx, Véronique Cornelissen, Roselien Buys 
19 Mar 2019-Jmir mhealth and uhealth
73 Citations
Also, the Apple Watch systematically overestimates EE in this group of patients.
Open access•Journal Article•DOI
Accuracy of Apple Watch Measurements for Heart Rate and Energy Expenditure in Patients With Cardiovascular Disease: Cross-Sectional Study.
Maarten Falter, Werner Budts, Kaatje Goetschalckx, Véronique Cornelissen, Roselien Buys 
19 Mar 2019-Jmir mhealth and uhealth
73 Citations
Caution might therefore be warranted when using the Apple Watch for measuring EE.
Book Chapter•DOI
Success Comes to Those Who Are Successful: The Influence of Past Product Expectation Confirmation on Smartwatch Usage
Alexander W. Ernst, Claus-Peter H. Ernst 
21 Jul 2016
9 Citations
After collecting 229 completed online questionnaires about the Apple Watch, and applying a structural equation modeling approach, our findings indicate that smartwatch usage is positively influenced by Perceived Usefulness.
Open access•Journal Article•DOI
The validity and inter-device variability of the Apple Watch™ for measuring maximal heart rate.
Grant Abt, James H. Bray, Amanda C. Benson 
01 Jul 2018-Journal of Sports Sciences
30 Citations
The Apple Watch™ has good to very good criterion validity for measuring HRmax, with no substantial under- or over-estimation.
Open access•Journal Article•DOI
Validity of Apple Watch Heart Rate Sensor Compared to Polar H10 Heart Rate Monitor [Georgia College and State University]
Lorin Weaver, Taylor Wooden, Jake Grazer 
19 Apr 2019-Journal of Student Research
4 Citations
Based on the findings of this study, it appears Apple Watch heart rate technology is comparable to chest strap heart rate monitors during various modes of physical activity.
Open access•Journal Article•DOI
Accuracy of Apple Watch Measurements for Heart Rate and Energy Expenditure in Patients With Cardiovascular Disease: Cross-Sectional Study.
Maarten Falter, Werner Budts, Kaatje Goetschalckx, Véronique Cornelissen, Roselien Buys 
19 Mar 2019-Jmir mhealth and uhealth
73 Citations
At this moment, however, it is too early to recommend the Apple Watch for cardiac rehabilitation.
Open access•Journal Article•DOI
Sleep monitoring with the Apple Watch: comparison to a clinically validated actigraph
Sirinthip Roomkham, Michael Hittle, Joseph Y. Cheung, Joseph Y. Cheung, David Lovell, Emmanuel Mignot, Dimitri Perrin 
29 May 2019-F1000Research
13 Citations
The performance of the Apple Watch compares favorably to the clinically validated Actiwatch in a normal environment.
Open access•Journal Article•DOI
Accuracy of Apple Watch Measurements for Heart Rate and Energy Expenditure in Patients With Cardiovascular Disease: Cross-Sectional Study.
Maarten Falter, Werner Budts, Kaatje Goetschalckx, Véronique Cornelissen, Roselien Buys 
19 Mar 2019-Jmir mhealth and uhealth
73 Citations
If confirmed, it might be considered safe to incorporate the Apple Watch in HR-guided training programs in the setting of cardiac rehabilitation.

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