Respostas cardiovasculares agudas em adolescentes com S??ndrome de Down submetidos a diferentes testes de concentra????o volunt??ria isom??trica m??xima

• Autor(a) principal: Melo, Geiziane Leite Rodrigues de
• Data de Publicação: 2019
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UCB
• Texto Completo: https://bdtd.ucb.br:8443/jspui/handle/tede/2597
• topic: Adolescentes; For??a isom??trica; S??ndrome de Down; Repostas hemodin??micas; Hemodynamic responses; Down syndrome; Isometric force; Adolescents; CNPQ::CIENCIAS DA SAUDE::EDUCACAO FISICA

Muscle strength is an important component in people's quality of life and autonomy, especially with Down syndrome (DS). However, there are few studies that verify the consequences of loss of muscle strength in individuals with DS. Thus, maximal strength tests for the upper and lower limbs may be an important tool to assess the degree of muscle strength with DS. In addition, there is a gap in the behavior of the cardiovascular parameters of this population when subjected to maximum stress tests using isometry and in the ergometric test. The aim of this study was to compare the level of muscle strength in maximal isometry tests in two dynamometers, one for lower limb and one for upper limb and to verify the acute cardiovascular responses submitted to the maximum isometric strength tests and in the exercise stress test in adolescents with DS and in their non-DS pairs. Eleven volunteers with SD (M = 4, F = 7, age 14.1 ?? 0.6) and 10 without DS (M = 4, F = 6, age 13.7 ?? 0.3) participated in the study. The tests of maximum voluntary isometric contraction (MVIC) in the handgrip (HG) and Leg Press 45 (LP45) were performed with 3 attempts of 5 seconds of isometric contraction and 3 minutes interval. Heart rate (HR) and blood pressure (BP) were measured at rest, during the test and at recovery at 5 and 10 min. Samples independent of Student's t-test were used for the comparisons between groups. The Interclass Correlation Coefficient (ICC) was adopted for relative reliability. The ANOVA with the Post Hoc of Turkey was used for the comparison between and intra-groups. The results indicated that the adolescents with DS had lower HG than their non-DS pairs, and there were significant differences between groups in the HG test and retest in p = 0.0004 and p <0.0001, respectively. This difference in muscle strength between groups was not significant for LP45. Regarding the MVIC tests for HG, a good reliability of 0.84 and 0.75 was verified in the control group and in the DS group, respectively. Regarding the LP45 test, it was observed that only in the DS group there was an excellent reliability of 0.94 in the tests, the same was not verified for the control group (CG). There were significant differences between the moments of the test and retest for SBP, HR and double product (p <0.05) in relation to cardiovascular responses at rest, recovery and during MVIC. In the ergometric test it was verified that the parameters such as maximum VO2, cardiac output, maximal heart rate and double product presented significant difference between groups (p <0.05). It is concluded that adolescents with DS have lower muscle strength involving muscular masses when compared to their non-DS pairs. In addition, it was found that adolescents with DS exhibit reduced cardiovascular responses when compared to CG, although they presented similar levels of physical activity.