http://www.petarjercic.com/enContents © 2026 <a href="mailto:petar.jercic@gmail.com">Petar Jerčić</a> <a rel="license" href="https://creativecommons.org/licenses/by-nc-sa/4.0/"> <img alt="Creative Commons License BY-NC-SA" style="border-width:0; margin-bottom:12px;" src="https://i.creativecommons.org/l/by-nc-sa/4.0/88x31.png"></a>Sat, 07 Mar 2026 14:45:16 GMTNikola (getnikola.com)http://blogs.law.harvard.edu/tech/rsshttp://www.petarjercic.com/posts/beyond-the-daily-number-understanding-your-hrv-normal-zone/Petar Jerčić<div><div class="cell border-box-sizing code_cell rendered" id="cell-id=cef09f77"> </div> <div class="cell border-box-sizing code_cell rendered" id="cell-id=5216c359"> </div> <div class="cell border-box-sizing text_cell rendered" id="cell-id=6fdb06b9"><div class="inner_cell"> <div class="text_cell_render border-box-sizing rendered_html"> <h3 id="Highligths">Highligths<a class="anchor-link" href="http://www.petarjercic.com/posts/beyond-the-daily-number-understanding-your-hrv-normal-zone/#Highligths">¶</a></h3><blockquote> <ul> <li><strong>HRV and RMSSD:</strong> The primary metric being analyzed is RMSSD, a standard measure of HRV.</li> <li><strong>The "Normal" Zone:</strong> The concept of establishing a personalized baseline range (a green zone) rather than relying on a universal "golden rule" or a single daily number.</li> <li><strong>Zone Calculation Approach:</strong> Using the distribution of daily RMSSD values, specifically averaging the lower end (bottom of zone) and upper end (top of zone) of distribution to determine the range.</li> </ul> </blockquote> </div> </div> </div> <div class="cell border-box-sizing text_cell rendered" id="cell-id=1a62e114"><div class="inner_cell"> <div class="text_cell_render border-box-sizing rendered_html"> <p><a href="http://www.petarjercic.com/posts/beyond-the-daily-number-understanding-your-hrv-normal-zone/">Read more…</a> (459 min remaining to read)</p></div></div></div></div>hrvrmssdzonehttp://www.petarjercic.com/posts/beyond-the-daily-number-understanding-your-hrv-normal-zone/Fri, 06 Mar 2026 20:05:31 GMThttp://www.petarjercic.com/posts/heart-rate-variability-and-why-it-matters-for-my-vacation/Petar Jerčić<div><div class="cell border-box-sizing code_cell rendered" id="cell-id=d60de096"> </div> <div class="cell border-box-sizing text_cell rendered" id="cell-id=6fdb06b9"><div class="inner_cell"> <div class="text_cell_render border-box-sizing rendered_html"> <h3 id="Highligths">Highligths<a class="anchor-link" href="http://www.petarjercic.com/posts/heart-rate-variability-and-why-it-matters-for-my-vacation/#Highligths">¶</a></h3><blockquote> <ul> <li><strong>Primary Metric (RMSSD):</strong> The objective time-domain statistic to quantify Parasympathetic activity.</li> <li><strong>Dual ANS Quantification:</strong> The analysis treats the Sympathetic (SNS) and Parasympathetic (PNS) branches as antagonistic but independent systems that can be <strong>co-activated</strong>, refuting the idea that one simply switches off when the other switches on.</li> <li><strong>"Normal Zone" Baselining:</strong> Physiological state is not absolute but relative to a personalized <strong>Normal Zone</strong>. This baseline is established by averaging multiple morning resting-state RMSSD recordings.</li> </ul> </blockquote> </div> </div> </div> <div class="cell border-box-sizing text_cell rendered" id="cell-id=1a62e114"><div class="inner_cell"> <div class="text_cell_render border-box-sizing rendered_html"> <p><a href="http://www.petarjercic.com/posts/heart-rate-variability-and-why-it-matters-for-my-vacation/">Read more…</a> (472 min remaining to read)</p></div></div></div></div>hrhrvpnsrmssdsnshttp://www.petarjercic.com/posts/heart-rate-variability-and-why-it-matters-for-my-vacation/Thu, 27 Nov 2025 09:34:31 GMT