{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,13]],"date-time":"2026-02-13T05:13:45Z","timestamp":1770959625986,"version":"3.50.1"},"reference-count":55,"publisher":"MDPI AG","issue":"14","license":[{"start":{"date-parts":[[2024,7,22]],"date-time":"2024-07-22T00:00:00Z","timestamp":1721606400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>The purpose of this study was to compare different high-intensity interval training (HIIT) protocols with different lengths of work and rest times for a single session (all three had identical work-to-rest ratios and exercise intensities) for cardiac auto-regulation using a wearable device. With a randomized counter-balanced crossover, 13 physically active young male adults (age: 19.4 years, BMI: 21.9 kg\/m2) were included. The HIIT included a warm-up of at least 5 min and three protocols of 10 s\/50 s (20 sets), 20 s\/100 s (10 sets), and 40 s\/200 s (5 sets), with intensities ranging from 115 to 130% Wattmax. Cardiac auto-regulation was measured using a non-invasive method and a wearable device, including HRV and vascular function. Immediately after the HIIT session, the 40 s\/200 s protocol produced the most intense stimulation in R-R interval (\u0394-33.5%), ln low-frequency domain (\u0394-42.6%), ln high-frequency domain (\u0394-73.4%), and ln LF\/HF ratio (\u0394416.7%, all p &lt; 0.05) compared to other protocols of 10 s\/50 s and 20 s\/100 s. The post-exercise hypotension in the bilateral ankle area was observed in the 40 s\/200 s protocol only at 5 min after HIIT (right: \u0394-12.2%, left: \u0394-12.6%, all p &lt; 0.05). This study confirmed that a longer work time might be more effective in stimulating cardiac auto-regulation using a wearable device, despite identical work-to-rest ratios and exercise intensity. Additional studies with 24 h measurements of cardiac autoregulation using wearable devices in response to various HIIT protocols are warranted.<\/jats:p>","DOI":"10.3390\/s24144758","type":"journal-article","created":{"date-parts":[[2024,7,22]],"date-time":"2024-07-22T17:36:04Z","timestamp":1721669764000},"page":"4758","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Acute Response of Different High-Intensity Interval Training Protocols on Cardiac Auto-Regulation Using Wearable Device"],"prefix":"10.3390","volume":"24","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8545-4711","authenticated-orcid":false,"given":"Myong-Won","family":"Seo","sequence":"first","affiliation":[{"name":"Department of Sport and Leisure Studies, College of Physical Education, Keimyung University, Daegu 42601, Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2024,7,22]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"2335","DOI":"10.1016\/j.jacc.2021.03.293","article-title":"Autoregulation of Coronary Blood Supply in Response to Demand: JACC Review Topic of the Week","volume":"77","author":"Johnson","year":"2021","journal-title":"J. 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