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Subjects (15.7 <jats:bold>\u00b1<\/jats:bold> 2.2 years old) performed a 4 x 50\u2010m front\u2010crawl test at maximal velocity (10 s rest interval) in weeks 2, 4, 9 and 12 of a 15\u2010week macrocycle. Descriptive statistics were used and the percentage of change and smallest worthwhile change (moderate, 0.6\u20101.2, and large, &gt; 1.2) were measured. Lactate concentration in the third, seventh and twelfth minute of recovery decreased significantly between weeks 2\u20109 (14.1, 15.7 and 17.6%) and increased between weeks 9\u201012 (18.2, 18.6 and 19.8%), with the HR presenting only trivial variations during the training period. Stroke length showed a large decrease in the first 50\u2010m trial between weeks 4\u20109 (6.2%) and a large increase between weeks 9\u201012 (3.1%). The stroke rate (in all 50\u2010m trials) increased significantly between weeks 4\u20109 (3\u2010 7%) and the stroke index had a moderate to large increase in the first and third 50\u2010m trial (3.6 and 7.1%, respectively) between weeks 9\u201012. The overall time decreased by 1.1% between weeks 2\u201012, being more evident after week 4. We concluded that physiological, kinematical and performance variables were affected by the period of training in regional age\u2010group swimmers.<\/jats:p>","DOI":"10.2478\/hukin-2019-0014","type":"journal-article","created":{"date-parts":[[2019,10,18]],"date-time":"2019-10-18T05:30:57Z","timestamp":1571376657000},"page":"213-223","source":"Crossref","is-referenced-by-count":7,"title":["Monitoring Changes Over a Training Macrocycle in Regional Age\u2010Group Swimmers"],"prefix":"10.5114","volume":"69","author":[{"given":"Guilherme","family":"Tucher","sequence":"first","affiliation":[{"name":"Escola de Educa\u00e7\u00e3o F\u00edsica e Desportos, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil. Aquatic Sports Science Research Group, GPCEA , Rio de Janeiro Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Fl\u00e1vio Ant\u00f4nio de Souza","family":"Castro","sequence":"additional","affiliation":[{"name":"Aquatic Sports Research Group, Escola de Educa\u00e7\u00e3o F\u00edsica, Fisioterapia e Dan\u00e7a, ,Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul , Porto Alegre Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nuno Domingos","family":"Garrido","sequence":"additional","affiliation":[{"name":"Research Centre in Sports Sciences, Health Sciences and Human Development, CIDESD , Vila Real , Portugal"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ricardo Jorge","family":"Fernandes","sequence":"additional","affiliation":[{"name":"Centre of Research, Education, Innovation and Intervention in Sport (CIFI2D), Faculty of Sports, University of Porto, Porto, Portugal; Porto Biomechanics Laboratory, LABIOMEP, University of Porto , Porto , Portugal"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"3061","published-online":{"date-parts":[[2019,10,18]]},"reference":[{"key":"2023012005160848643_j_hukin-2019-0014_ref_001_w2aab3b7c12b1b6b1ab1b6b1Aa","doi-asserted-by":"crossref","unstructured":"Anderson ME, Hopkins WG, Roberts AD, Pyne DB. 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