{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,4]],"date-time":"2026-07-04T00:31:15Z","timestamp":1783125075360,"version":"3.54.6"},"reference-count":38,"publisher":"MDPI AG","issue":"12","license":[{"start":{"date-parts":[[2021,11,26]],"date-time":"2021-11-26T00:00:00Z","timestamp":1637884800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["JCDD"],"abstract":"<jats:p>The purpose of this study was to compare the acute cardiorespiratory responses and time spent above different %VO2peak intensities between three \u201ciso-work\u201d protocols: (a) a high intensity interval training protocol (HIIT), (b) a higher intensity continuous protocol (CON70) and (c) a lower intensity continuous protocol (CON50) in patients with chronic heart failure (CHF). Ten male CHF patients (aged 55.1 \u00b1 16.2 years) performed in separate days a single session of a HIIT protocol consisted of 4 sets \u00d7 4 min cycling at 80% VO2peak with 3 min of recovery at 50% VO2peak, a CON70 protocol corresponding to 70% VO2peak and a CON50 protocol corresponding to 50% VO2peak. Cardiopulmonary data were collected by an online gas analysis system. The HIIT and CON70 elicited higher cardiorespiratory responses compared to CON50 with no differences between them (p &gt; 0.05). In HIIT and CON70, patients exercised longer at &gt;80% and &gt;90% VO2peak. The completion rate was 100% for the three protocols. Not any adverse events were observed in either protocol. Both HIIT and CON70 elicited a stronger physiological stimulus and required shorter time than CON50. Both HIIT and CON70 also induced comparable hemodynamic responses and ventilatory demand.<\/jats:p>","DOI":"10.3390\/jcdd8120164","type":"journal-article","created":{"date-parts":[[2021,11,30]],"date-time":"2021-11-30T23:22:28Z","timestamp":1638314548000},"page":"164","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Acute Cardiorespiratory Responses to Different Exercise Modalities in Chronic Heart Failure Patients\u2014A Pilot Study"],"prefix":"10.3390","volume":"8","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6735-4183","authenticated-orcid":false,"given":"Eleftherios","family":"Karatzanos","sequence":"first","affiliation":[{"name":"Clinical Ergospirometry, Exercise and Rehabilitation Laboratory, School of Medicine, National and Kapodistrian University of Athens, 106 75 Athens, Greece"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Panagiotis","family":"Ferentinos","sequence":"additional","affiliation":[{"name":"Carnegie Faculty, School of Sport, Leeds Beckett University, Leeds LS6 3QT, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Georgios","family":"Mitsiou","sequence":"additional","affiliation":[{"name":"Clinical Ergospirometry, Exercise and Rehabilitation Laboratory, School of Medicine, National and Kapodistrian University of Athens, 106 75 Athens, Greece"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2199-3788","authenticated-orcid":false,"given":"Stavros","family":"Dimopoulos","sequence":"additional","affiliation":[{"name":"Clinical Ergospirometry, Exercise and Rehabilitation Laboratory, School of Medicine, National and Kapodistrian University of Athens, 106 75 Athens, Greece"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Argyrios","family":"Ntalianis","sequence":"additional","affiliation":[{"name":"Heart Failure and Cardio-Oncology Unit, Alexandra Hospital, 115 28 Athens, Greece"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Serafeim","family":"Nanas","sequence":"additional","affiliation":[{"name":"Clinical Ergospirometry, Exercise and Rehabilitation Laboratory, School of Medicine, National and Kapodistrian University of Athens, 106 75 Athens, Greece"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2021,11,26]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"646","DOI":"10.1161\/CIRCRESAHA.113.300268","article-title":"Epidemiology of Heart Failure","volume":"113","author":"Roger","year":"2013","journal-title":"Circ. 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