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Previous issue date: 2017-02-17 / Modern society has been increasingly exposed to daily stress situations. Neuroexcitatory,
metabolic, cardiovascular and even inflammatory responses may become hyperreactive to
these situations, increasing the chances of diverse physiological dysfunctions, especially
cardiovascular ones. It has been shown that a single exercise session performed prior to stress
situations may be useful in attenuating blood pressure hyperreactivity to stress. Among the
methods applied to evaluate cardiovascular reactivity to stress, is the cold pressure test (CPT).
However, heart rate variability (HRV) responses to CPT have been poorly investigated.
Although there is evidence that a higher level of physical fitness is related to a lower
reactivity to stress, the relationship between muscle strength levels and cardiovascular
reactivity to CPT has not been investigated yet. The aim of this study was to investigate the
autonomic and cardiovascular responses to CPT in individuals with different levels of manual
grip strength. This is a study where the use of questionnaire techniques, anthropometric
measurements, hemodynamic measurements, neuromuscular evaluation, cardiovascular and
autonomic reactivity to an induced stress test were used. A total of 57 male subjects aged 18
to 30 years participated in the study. After this evaluation and general procedures, volunteers
were divided into tertiles by their relative manual grip strength level. The lower strength
group (BF) presented higher values of body mass, body mass index (BMI), body fat and
waist-to-height ratio compared to the mean strength (MS) and high strength (HS) groups.
Regarding the cardiovascular reactivity to CPT, the three groups presented similar variation
of blood pressure (BP), with systolic blood pressure (SBP) increasing significantly during
CPT and decreasing during recovery until the third minute. Mean arterial pressure (Dampney
et al.) showed higher values during CPT and lower in the third minute of recovery, which was
also lower than the resting values for the FB group. Autonomic reactivity, as measured by
HRV, demonstrated a discrepant behavior between the groups. During the CPT, subjects with
lower manual grip relative strength had an BP response similar to the medium and high
manual grip relative strength groups, but with greater sympathetic activation. / A sociedade moderna tem sido cada vez mais exposta a situa????es de estresse di??rias. As
respostas neuroexcitat??rias, metab??licas, cardiovasculares e mesmo inflamat??rias podem se
tornar hiper-reativas a essas situa????es, aumentando as chances de disfun????es fisiol??gicas
diversas, em especial cardiovasculares. Tem sido demonstrado que uma ??nica sess??o de
exerc??cio realizada antes das situa????es de estresse pode ser ??til para atenuar a hiperreatividade
da press??o arterial ao estresse. Entre os m??todos aplicados para avaliar a
reatividade cardiovascular ao estresse, esta o cold pressor test (CPT). No entanto, as respostas
da variabilidade da frequ??ncia card??aca (VFC) ao CPT t??m sido pouco investigadas. Embora
existam evid??ncias de que um maior n??vel de aptid??o f??sica esteja relacionado a uma menor
reatividade ao estresse, a rela????o entre os n??veis de for??a muscular e a reatividade
cardiovascular ao CPT ainda n??o foi investigada. O estudo teve como objetivo investigar as
respostas auton??micas e cardiovasculares ao CPT em indiv??duos com diferentes n??veis de
for??a de preens??o manual. Trata-se de um estudo onde se utilizou de t??cnicas de aplica????o de
question??rios, tomada de medidas antropom??tricas, hemodin??micas, avalia????o neuromuscular,
reatividade cardiovascular e auton??mica a um teste de estresse induzido. Participaram do
estudo 57 sujeitos do sexo masculino com idades entre 18 a 30 anos. Ap??s esta avalia????o e os
procedimentos gerais, os volunt??rios foram divididos em tercis pelo seu n??vel de for??a relativa
de preens??o manual. O grupo baixa for??a (FB) apresentou valores mais elevados de massa
corporal, ??ndice de massa corporal (IMC), gordura corporal e rela????o cintura-estatura em
compara????o com os grupos m??dia for??a (FM) e elevada for??a (FE). Quanto ?? reatividade
cardiovascular ao CPT, os tr??s grupos apresentaram varia????o similar da press??o arterial (PA),
com valores de press??o arterial sist??lica (PAS) aumentando significativamente durante o CPT
e diminuindo durante a recupera????o at?? o terceiro minuto. A press??o arterial m??dia (PAM)
demonstrou valores mais altos durante o CPT e inferior no terceiro minuto de recupera????o, o
que tamb??m foi menor do que os valores de repouso para o grupo FB. A reatividade
auton??mica, medida pela VFC, demonstrou um comportamento discrepante entre os grupos.
Durante o CPT os indiv??duos com for??a relativa de preens??o manual inferior apresentaram
resposta PA semelhantes aos grupos de for??a relativa de preens??o manual m??dia e alta, mas
com maior ativa????o simp??tica.
| Identifer | oai:union.ndltd.org:IBICT/oai:bdtd.ucb.br:tede/2019 |
| Date | 17 February 2017 |
| Creators | Souto Filho, Jos?? Morais |
| Contributors | Sim??es, Herbert Gustavo, Rosa, Thiago dos Santos |
| Publisher | Universidade Cat??lica de Bras??lia, Programa Strictu Sensu em Educa????o F??sica, UCB, Brasil, Escola de Sa??de e Medicina |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Biblioteca Digital de Teses e Dissertações da UCB, instname:Universidade Católica de Brasília, instacron:UCB |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | 6095716513072507778, 500, 500, 600, 3870802503144686128, 5178284805913411594 |
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