{"id":8483,"date":"2019-05-31T23:54:17","date_gmt":"2019-05-31T22:54:17","guid":{"rendered":"https:\/\/blogs.bmj.com\/bjsm\/?p=8483"},"modified":"2019-06-04T17:29:11","modified_gmt":"2019-06-04T16:29:11","slug":"questions-regarding-dr-ricardo-borges-viana-et-al-s-paper-on-interval-training-and-fat-loss","status":"publish","type":"post","link":"https:\/\/blogs.bmj.com\/bjsm\/2019\/05\/31\/questions-regarding-dr-ricardo-borges-viana-et-al-s-paper-on-interval-training-and-fat-loss\/","title":{"rendered":"Questions regarding recent BJSM Systematic Review on Interval Training and Fat Loss"},"content":{"rendered":"<p><em>Re: Viana<\/em><em>, <\/em><em>et al<\/em> <em>&#8220;Is interval training the magic bullet for fat loss? A systematic review and meta-analysis comparing moderate-intensity continuous training with high-intensity interval training (HIIT).&#8221;<\/em> <em>British Journal of Sports Medicine<\/em> <em>53<\/em><em>.<\/em><em>10<\/em> <em>(2019):<\/em> <em>655-664<\/em>. <em>Web. 30 May. 2019.<\/em><\/p>\n<p><a href=\"https:\/\/protect-au.mimecast.com\/s\/6j5NC3Q8Z2FzAvRxIgZr_-?domain=bjsm.bmj.com\">https:\/\/bjsm.bmj.com\/content\/53\/10\/655<\/a><\/p>\n<p>The eLetter was submitted by <strong>M<\/strong><strong>r Matthew Hollings<\/strong><strong>, Prof. Jeff Coombes<\/strong><strong>, Dr Yorgi Mavros<\/strong><strong>, Dr Shelley Keating<\/strong><strong>, Prof. Maria Fiatarone Singh <\/strong>on 30 05 2019:<\/p>\n<p>After careful appraisal and following our own investigations, we are concerned that the article <em>\u201cIs interval training the magic bullet for fat loss? A systematic review and meta-analysis comparing moderate-intensity continuous training with high-intensity interval training (HIIT)\u201d<\/em> [1] may have some data extraction and analysis errors that warrant further review by the editor and authors, and which may impact the original conclusions of the article.<\/p>\n<p><strong>Point 1<\/strong><\/p>\n<p>We were initially concerned about the reported results in one of the papers in the SR&#8211;the Thomas et al. paper [2]. We question the biological plausibility of a mean between-group fat-loss difference of 13.4 kg over 12 weeks. Given that the SR authors did not report any study-level data, we decided to investigate the effect size as published by Thomas et al. The Thomas study [2] did not report any fat mass data, only % body fat data. Given that the authors of the review [1] reported \u201cWhen studies provided insufficient data for inclusion in the meta-analysis (five studies), the corresponding authors were contacted via email to determine whether additional data could be provided; however, no corresponding authors responded.\u201d We authors do not understand how an unpublished mean difference of -13.44 kg in favour of HIIT\/SIT could be presented within the fat mass analysis of this review.<\/p>\n<p><strong>Point 2<\/strong><\/p>\n<p>When we reviewed another of the included studies [3], we found that fat mass data were reported, but not included in the current meta-analysis [1]. Given the marginal level of significance for the fat mass outcome in the review (MD, CI; -2.28, [-4.00, -0.56]), it is possible that if these data had been excluded\/included the primary conclusion of this article (that HIIT training resulted in superior fat mass loss compared to moderate intensity aerobic training), may be altered.<\/p>\n<p><strong>Point 3<\/strong><\/p>\n<p>When we reviewed the first two data points in the % body fat plot, we are also concerned about the calculated effect sizes. We are unable to confirm whether the calculations are accurate as there are no study-level data or effect size (ES) calculation methods in either the review article or the registered protocol on PROSPERO (CRD42018089427). Whilst the Thomas et al. [2] paper reported % body fat data graphically, and we acknowledge there may be some minor differences in data points depending on which graph analysis tool was used, the Trapp et al. [3] paper reported all pre- and post- mean and standard error data, so our ES and CI calculations should be identical to those in the review if the same calculation method was used.<\/p>\n<p>However, when we calculated ES using the pooled baseline SD for ES calculation (-3.30 [-13.36, 6.76]), this differed from that reported by the Viana et al (-9.59 [-16.97, -2.20]). Presuming that the authors are presenting mean difference data (as suggested in their forest plot figures), there should be no disputing this value as -3.30, based solely on study-level data.<\/p>\n<p>Our analyses only examined data from these two studies, so we can neither verify nor refute the results presented for the remaining 34 included studies.<\/p>\n<p><strong>Point 4<\/strong><\/p>\n<p>We question the inclusion of one of the studies in the review. Mr Viana and colleagues have included the study by Boer and Moss [4] that used 70-80% VO2peak for their moderate intensity exercise. This is outside the 40-60% VO2max \u2018criteria\u2019 for moderate intensity provided by the authors.<\/p>\n<p>In conclusion, we flag 4 concerns about the accuracy of the data extraction, its analysis, as well as study selection in Mr Viana&#8217;s review [1]. We therefore respectfully seek clarification. We appreciate that next steps would depend on the answers to our questions.<\/p>\n<p><strong>Authors: M<\/strong><strong>r Matthew Hollings<\/strong><strong>1<\/strong><strong>, Prof. Jeff Coombes<\/strong><strong>2<\/strong><strong>, Dr Yorgi Mavros<\/strong><strong>1<\/strong><strong>, Dr Shelley Keating<\/strong><strong>2<\/strong><strong>, Prof. Maria Fiatarone Singh<\/strong><strong>1<\/strong><\/p>\n<p><strong>References<\/strong><\/p>\n<p>[1] Viana RB, Naves JPA, Coswig VS, et al Is interval training the magic bullet for fat loss? A systematic review and meta-analysis comparing moderate-intensity continuous training with high-intensity interval training (HIIT) Br J Sports Med. Published Online First: 14 February 2019.<\/p>\n<p>[2] Thomas TR, Adeniran SB, Etheridge GL. Effects of different running programs on VO2max, percent fat, and plasma lipids. Can J Appl Sport Sci 1984;9:55\u201362.<\/p>\n<p>[3] Trapp EG, Chisholm DJ, Freund J, et al. The effects of high-intensity intermittent exercise training on fat loss and fasting insulin levels of young women. Int J Obes 2008;32:684\u201391.<\/p>\n<p>[4] Boer PH , Moss SJ . Effect of continuous aerobic vs. interval training on selected anthropometrical, physiological and functional parameters of adults with Down syndrome. J Intellect Disabil Res 2016;60:322\u201334<\/p>\n<p><strong>_____________________________<\/strong><\/p>\n<p>&nbsp;<\/p>\n<p><strong>MATTHEW HOLLINGS\u00a0<\/strong>| <em>ESSAM AES<\/em><\/p>\n<p>PhD Candidate<\/p>\n<p>Physical Activity, Lifestyle, Ageing and Wellbeing Faculty Research Group<\/p>\n<p>Faculty of Health Sciences<\/p>\n<p><strong>THE UNIVERSITY OF SYDNEY<br \/>\n<\/strong>H111, Lvl 1, H C43 | East St, Lidcombe NSW | 2141<br \/>\n<strong>T<\/strong>\u00a0+61 2 9036\u00a07364\u00a0|\u00a0<strong>E<\/strong>\u00a0<a href=\"mailto:matthew.hollings@sydney.edu.au\"><strong>matthew.hollings@sydney.edu.au<\/strong><\/a>\u00a0|\u00a0<strong>W<\/strong>\u00a0<a href=\"http:\/\/sydney.edu.au\/\"><strong>sydney.edu.au<\/strong><\/a><\/p>\n<p><a href=\"https:\/\/blogs.bmj.com\/bjsm\/2019\/05\/31\/questions-regarding-dr-ricardo-borges-viana-et-al-s-paper-on-interval-training-and-fat-loss\/8skfncuj_400x400\/\" rel=\"attachment wp-att-8492\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone  wp-image-8492\" src=\"https:\/\/blogs.bmj.com\/bjsm\/files\/2019\/05\/8sKFNcuj_400x400.jpg\" alt=\"\" width=\"138\" height=\"138\" srcset=\"https:\/\/blogs.bmj.com\/bjsm\/files\/2019\/05\/8sKFNcuj_400x400.jpg 400w, https:\/\/blogs.bmj.com\/bjsm\/files\/2019\/05\/8sKFNcuj_400x400-150x150.jpg 150w, https:\/\/blogs.bmj.com\/bjsm\/files\/2019\/05\/8sKFNcuj_400x400-300x300.jpg 300w\" sizes=\"auto, (max-width: 138px) 100vw, 138px\" \/><\/a><!--TrendMD v2.4.8--><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Re: Viana, et al &#8220;Is interval training the magic bullet for fat loss? A systematic review and meta-analysis comparing moderate-intensity continuous training with high-intensity interval training (HIIT).&#8221; British Journal of Sports Medicine 53.10 (2019): 655-664. Web. 30 May. 2019. https:\/\/bjsm.bmj.com\/content\/53\/10\/655 The eLetter was submitted by Mr Matthew Hollings, Prof. Jeff Coombes, Dr Yorgi Mavros, Dr [&#8230;]<\/p>\n<p><a class=\"btn btn-secondary understrap-read-more-link\" href=\"https:\/\/blogs.bmj.com\/bjsm\/2019\/05\/31\/questions-regarding-dr-ricardo-borges-viana-et-al-s-paper-on-interval-training-and-fat-loss\/\">Read More&#8230;<\/a><\/p>\n","protected":false},"author":1,"featured_media":8492,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-8483","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Questions regarding recent BJSM Systematic Review on Interval Training and Fat Loss - BJSM blog - social media&#039;s leading SEM voice<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.bmj.com\/bjsm\/2019\/05\/31\/questions-regarding-dr-ricardo-borges-viana-et-al-s-paper-on-interval-training-and-fat-loss\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Questions regarding recent BJSM Systematic Review on Interval Training and Fat Loss - BJSM blog - social media&#039;s leading SEM voice\" \/>\n<meta property=\"og:description\" content=\"Re: Viana, et al &#8220;Is interval training the magic bullet for fat loss? 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A systematic review and meta-analysis comparing moderate-intensity continuous training with high-intensity interval training (HIIT).&#8221; British Journal of Sports Medicine 53.10 (2019): 655-664. 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