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Previous issue date: 2015-05-27 / O exerc?cio intervalado de alta intensidade tem sido apontado como op??o para o aumento da pr?tica da atividade f?sica al?m de ser sugerido no manejo terap?utico de diversas condi??es como diabetes mellitus e insufici?ncia card?aca. Contudo, o conhecimento pleno das suas repercuss?es fisiol?gicas e dos par?metros que possam trazer maior seguran?a quanto ? sua prescri??o; em especial os efeitos a curto e m?dio prazo (24 horas ap?s o exerc?cio) sobre a recupera??o do exerc?cio, necessitam ser esclarecidos. O objetivo do presente trabalho ? avaliar a repercuss?o de uma sess?o de exerc?cio aer?bico cont?nuo e intervalado no controle auton?mico card?aco imediato e em m?dio prazo (24 horas), atrav?s da avalia??o da variabilidade da frequ?ncia card?aca (VFC). Trata-se de um ensaio cl?nico randomizado do tipo crossover onde indiv?duos jovens saud?veis e com baixo n?vel de atividade f?sica tiveram a VFC de 24 horas mensurada atrav?s de frequenc?metro e aceler?metro port?til (eMotion HRV 3D, Kuopio, Finl?ndia) antes e ap?s sess?o de exerc?cio aer?bio cont?nuo (60-70% FCmax, 21min.) e intervalado (ciclo 1 min. a 80-90% FCmax, 2 min. a 50-60% FCmax, dura??o 21 min.). A VFC foi avaliada nos dom?nio tempo e frequ?ncia e o balan?o simpatovagal determinado pela raz?o LF/HF. Avalia??o n?o linear foi calculada pela entropia de Shannon. O dados demonstraram retardo na recupera??o imediata da frequ?ncia card?aca p?s exerc?cio e menor FC 24 horas comparados a valores pr? interven??o, principalmente no exerc?cio intervalado. Houve tend?ncia ? maior predom?nio e valores de ?ndices representantes da estimula??o simp?tica durante o dia no grupo de exerc?cio intervalado; contudo, sem signific?ncia estat?stica. O resultados do estudo auxiliam no esclarecimento das repercuss?es do exerc?cio intervalado nas 24 horas que sucedem a interven??o permitindo par?metros para prescri??o e futura avalia??o de grupos de indiv?duos com patologias metab?licas e cardiovasculares. / The high-intensity interval exercise has been described as an option for increasing physical activity and its use also being suggested in the therapeutic management of many conditions such as diabetes mellitus and heart failure. However, the knowledge of its physiological effects and parameters that can assure greater safety for interval exercise prescription; especially its effect on short- and medium-term (24 hours after exercise) exercise recovery, need to be clarified. This study objective was to evaluate the effect of continuous and interval aerobic exercise on the cardiac autonomic control immediate and medium term (24 hours), by assessing heart rate variability (HRV). The present study is a randomized crossover clinical trial in which healthy young individuals with low level of physical activity had the VFC 24 hours measured by a heart rate sensor and portable accelerometer (3D eMotion HRV, Kuopio, Finland) before and after continuous aerobic exercise (60-70% HR max, 21 min.) and interval exercise (cycle 1 min. 80-90% HR max, 2 min. at 50-60% HR max, duration 21 min.). HRV was measured in the time and frequency domain and the sympathovagal balance determined by the ratio LF / HF. Nonlinear evaluation was calculated by Shannon entropy. The data demonstrated delayed heart rate recovery immediate after exercise and lower HR after 24 hours compared to pre intervention values, especially in the interval exercise group. There was a tendency to higher predominance and representatives index values of sympathetic stimulation during the day in interval exercise group; however, without statistical significance. The study results help to clarify the effects of interval exercise on the 24 hours following interval exercise, setting parameters for prescription and for further evaluation of groups with metabolic and cardiovascular diseases.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/20817 |
| Date | 27 May 2015 |
| Creators | Pinheiro, Pedro Ivo de Souza |
| Contributors | 02817849906, http://lattes.cnpq.br/6391134710454943, Gualdi, Lucien Peroni, 00872550060, http://lattes.cnpq.br/3486514016305167, Silva J?nior, Rubens Alexandre da, 02117648924, http://lattes.cnpq.br/5152647954949893, Dias, Fernando Augusto Lavezzo |
| Publisher | Universidade Federal do Rio Grande do Norte, PROGRAMA DE P?S-GRADUA??O EM FISIOTERAPIA, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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