{"id":6728,"date":"2014-01-05T14:24:57","date_gmt":"2014-01-05T12:24:57","guid":{"rendered":"https:\/\/www.famelab.gr\/?p=6728"},"modified":"2025-10-30T08:41:07","modified_gmt":"2025-10-30T08:41:07","slug":"heart-rate-variability-during-exertional-heat-stress-effects-of-heat-production-and-treatment","status":"publish","type":"post","link":"https:\/\/famelab.gr\/el\/heart-rate-variability-during-exertional-heat-stress-effects-of-heat-production-and-treatment\/","title":{"rendered":"Heart rate variability during exertional heat stress: effects of heat production and treatment"},"content":{"rendered":"<p><span style=\"color: #000000;\"> <a href=\"https:\/\/famelab.gr\/el\/heart-rate-variability-during-exertional-heat-stress-effects-of-heat-production-and-treatment\/\"><img fetchpriority=\"high\" decoding=\"async\" class=\"alignright wp-image-4214 size-medium\" title=\"FAME Lab - Heart rate variability during exertional heat stress: effects of heat production and treatment\" src=\"https:\/\/www.famelab.gr\/wp-content\/uploads\/2021\/07\/88-300x243.png\" alt=\"FAME Lab - Heart rate variability during exertional heat stress: effects of heat production and treatment\" width=\"300\" height=\"243\" \/><\/a><a href=\"https:\/\/famelab.gr\/el\/people\/\" target=\"_blank\" rel=\"noopener noreferrer\">Flouris AD<\/a>, Bravi A, Wright-Beatty HE, Green G, Seely AJ, Kenny GP. Heart rate variability during exertional heat stress: effects of heat production and treatment. Eur J Appl Physiol. 2014 Apr;114(4):785-92. doi: 10.1007\/s00421-013-2804-7. Epub 2014 Jan 5. PMID: 24390688.<\/span><\/p>\n<p><span style=\"color: #000000;\"><strong>Abstract:<\/strong><\/span><\/p>\n<p>Purpose: We assessed the efficacy of different treatments (i.e., treatment with ice water immersion vs. natural recovery) and the effect of exercise intensities (i.e., low vs. high) for restoring heart rate variability (HRV) indices during recovery from exertional heat stress (EHS).<\/p>\n<p>Methods: Nine healthy adults (26 \u00b1 3 years, 174.2 \u00b1 3.8 cm, 74.6 \u00b1 4.3 kg, 17.9 \u00b1 2.8 % body fat, 57 \u00b1 2 mL\u00b7kg\u00b7(-1) min(-1) peak oxygen uptake) completed four EHS sessions incorporating either walking (4.0-4.5 km\u00b7h(-1), 2 % incline) or jogging (~7.0 km\u00b7h(-1), 2 % incline) on a treadmill in a hot-dry environment (40 \u00b0C, 20-30 % relative humidity) while wearing a non-permeable rain poncho for a slow or fast rate of rectal temperature (T re) increase, respectively. Upon reaching a T re of 39.5 \u00b0C, participants recovered until T re returned to 38 \u00b0C either passively or with whole-body immersion in 2 \u00b0C water. A comprehensive panel of 93 HRV measures were computed from the time, frequency, time-frequency, scale-invariant, entropy and non-linear domains.<\/p>\n<p>Results: Exertional heat stress significantly affected 60\/93 HRV measures analysed. Analyses during recovery demonstrated that there were no significant differences between HRV measures that had been influenced by EHS at the end of passive recovery vs. whole-body cooling treatment (p &gt; 0.05). Nevertheless, the cooling treatment required statistically significantly less time to reduce T re (p &lt; 0.001).<\/p>\n<p>Conclusions: While EHS has a marked effect on autonomic nervous system modulation and whole-body immersion in 2 \u00b0C water results in faster cooling, there were no observed differences in restoration of autonomic heart rate modulation as measured by HRV indices with whole-body cold-water immersion compared to passive recovery in thermoneutral conditions.<\/p>\n<p><span style=\"color: #000000;\"><strong>Full Text Link: <\/strong><\/span><\/p>\n<p><a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/24390688\/\" target=\"_blank\" rel=\"noopener noreferrer\">https:\/\/pubmed.ncbi.nlm.nih.gov\/24390688\/<\/a><\/p>\n<p><img decoding=\"async\" class=\"alignnone wp-image-8302 size-full\" src=\"https:\/\/www.famelab.gr\/wp-content\/uploads\/2021\/11\/Line.png\" alt=\"\" width=\"1316\" height=\"1\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>","protected":false},"excerpt":{"rendered":"<p>Flouris AD, Bravi A, Wright-Beatty HE, Green G, Seely AJ, Kenny GP. Heart rate variability during exertional heat stress: effects of heat production and treatment. Eur J Appl Physiol. 2014 Apr;114(4):785-92. doi: 10.1007\/s00421-013-2804-7. Epub 2014 Jan 5. PMID: 24390688. Abstract: Purpose: We assessed the efficacy of different treatments (i.e., treatment with ice water immersion vs. [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[45],"tags":[],"class_list":["post-6728","post","type-post","status-publish","format-standard","hentry","category-fame-lab-publications-2014"],"_links":{"self":[{"href":"https:\/\/famelab.gr\/el\/wp-json\/wp\/v2\/posts\/6728","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/famelab.gr\/el\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/famelab.gr\/el\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/famelab.gr\/el\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/famelab.gr\/el\/wp-json\/wp\/v2\/comments?post=6728"}],"version-history":[{"count":1,"href":"https:\/\/famelab.gr\/el\/wp-json\/wp\/v2\/posts\/6728\/revisions"}],"predecessor-version":[{"id":16648,"href":"https:\/\/famelab.gr\/el\/wp-json\/wp\/v2\/posts\/6728\/revisions\/16648"}],"wp:attachment":[{"href":"https:\/\/famelab.gr\/el\/wp-json\/wp\/v2\/media?parent=6728"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/famelab.gr\/el\/wp-json\/wp\/v2\/categories?post=6728"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/famelab.gr\/el\/wp-json\/wp\/v2\/tags?post=6728"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}