ABSTRACT
Emerging evidence suggests that resistance training (RT) can mitigate respiratory muscle weakness in hemodialysis (HD) patients. However, the underlying mechanisms responsible for these beneficial effects remain unclear. The purpose of this study was to assess the impact of periodized RT on respiratory muscle strength and its relationship with handgrip strength (HGS), fat-free mass (FFM), nitric oxide (NO), and interdialytic weight gain (IWG) in HD patients. Thirty-three patients were randomly assigned to two groups: control (CTL; n=18) and RT (n=15). RT group did not perform any additional exercise training specific to the respiratory tract. Maximal inspiratory (MIP) and expiratory (MEP) pressures, peak expiratory flow (PEF), HGS, FFM, NO, and IWG were measured before and after the intervention period. Participants in the RT group engaged in a 24-week RT program, three times per week. RT resulted in significant improvements in MIP, MEP, PEF, as well as enhancements in HGS, FFM, NO, and IWG (p<0.05). Notably, inverse correlations were observed between MIP (r= -0.37, p=0.03) and PEF (r= -0.4, p=0.02) with IWG. Thus, the amelioration of HGS and FFM coincided with a reduction in respiratory muscle weakness among HD patients. Decreased IWG and increased circulating NO are plausible mechanisms contributing to these improvements.
ABSTRACT
O presente estudo analisou a relação entre cronotipo, níveis de ansiedade, depressão e estresse, bem como níveis de condicionamento cardiorrespiratório em jovens. Métodos: Foi analisado um total de 36 participantes com idades entre 18 e 28 a nos, saudáveis e que atendessem ao cronotipo matutino e vespertino. Análises de nível de atividade física, consumo máximo de oxigênio, níveis de depressão, ansiedade e estresse foram realizadas com testes específicos. Em todos os cálculos foram utilizados um alfa de p<0.05 para análise estatística. Resultados: O nível de atividade física mostrou que a porcentagem dos matutinos suficientemente ativos foi de 58% comparado com 23.5% dos vespertinos. Mulheres com cronotipo vespertino apresentaram níveis menores de VO2máx quando comparados com as mulheres com cronotipo matutino (p=0.04). Os participantes vespertinos apresentaram níveis maiores de ansiedade (p=0.02) comparados com os matutinos e esses dados foram evidentes nos participantes do sexo feminino onde as mulheres do cronotipo vespertino apresentaram níveis maiores de ansiedade (p=0.03) comparados com mulheres de cronotipo matutino. Conclusão: Portanto, o estudo conclui que indivíduos do cronotipo vespertino apresentaram menores níveis de atividade física e maiores níveis de ansiedade evidenciados principalmente nas mulheres.(AU)
The present study analyzed a relationship between schedule, anxiety, depression and stress levels, as well as cardiorespiratory fitness levels in young people. Methods: A total of 36 healthy participants aged 18 to 28 years who met the criteria for chronotypes morning type and evening type were analyzed. Analyzes of physical activity level, maximal oxygen uptake, depression, anxiety and stress levels were performed. In all calculations, an alpha of p <0.05 was used for statistical analysis. Results: The level of physical activity was higher in morning types 58% compared to 23.5% of evening types. Women with evening chronotype had lower VO2max levels compared with women with a morning chronotype (p= 0.04). Evening types had higher anxiety levels (p= 0.02) compared to morning types and these data were evidenced in female participants with higher anxiety levels (p=0.03) compared to women with a morning chronotype. Conclusion: Therefore, the study concludes that young people with a evening chronotype exhibited lower levels of physical activity and higher anxiety levels, especially in women.(AU)
