Published on in Vol 8, No 7 (2020): July
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/18761, first published
.
![A Novel Smartphone App for the Measurement of Ultra–Short-Term and Short-Term Heart Rate Variability: Validity and Reliability Study A Novel Smartphone App for the Measurement of Ultra–Short-Term and Short-Term Heart Rate Variability: Validity and Reliability Study](https://asset.jmir.pub/assets/6fe30b3b28cf1931aac0dcbd218bfdbf.png 480w,https://asset.jmir.pub/assets/6fe30b3b28cf1931aac0dcbd218bfdbf.png 960w,https://asset.jmir.pub/assets/6fe30b3b28cf1931aac0dcbd218bfdbf.png 1920w,https://asset.jmir.pub/assets/6fe30b3b28cf1931aac0dcbd218bfdbf.png 2500w)
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