Cláudia Lúcia de Moraes Forjaz (original) (raw)
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Papers by Cláudia Lúcia de Moraes Forjaz
Arquivos Brasileiros de Cardiologia, 1998
Purpose-Heart rate variability (HRV) has been studied at rest as a non-invasive tool for the asse... more Purpose-Heart rate variability (HRV) has been studied at rest as a non-invasive tool for the assessment of cardiac autonomic control and, its attenuation is related to cardiovascular risk. However, during exercise, when important neural changes take place, HRV behaviour is not well established. The aim of this investigation was to study the heart rate (HR) and HRV responses during the different metabolic phases of maximal graded exercise in young men. Methods-Seventeen men (age 28±6 years) were submitted to a graded cardiopulmonary exercise test in a cycloergometer (30W/3min). To study HR and HRV (standard-deviation), the eletrocardiographic signal was amplified and acquired beat-to-beat in a computer at a frequency of 125 Hz (AT/Codas). Results-The HR increases concomitantly to the increase in exercise intensity. The HRV was significantly lower than rest values after exercise intensities of 60% of peak exercise oxygen uptake, 45-60% of maximal power and, after anaerobic threshold intensity. Conclusion-This results suggest that HRV measured by standard deviation of HR decreases during exercise phases when HR increment is determined mainly due to vagal withdrawal.
The main aim of this study was to introduce the use of multilevel modeling in the data from a mix... more The main aim of this study was to introduce the use of multilevel modeling in the data from a mixed longitudinal study concerning growth, development and health of Portuguese adolescents. The sample comprises 5155 subjects from 4 age cohorts: 10 to 12, 12 to 14, 14 to 16 and 16 to 18 years. Variables chosen for analysis were handgrip strength and percentage of total body fat. Multilevel modeling analysis showed a quadratic trajectory of adolescents' handgrip strength performance, with higher annual increasing in boys. The percentage of total body fat was positively associated with the static strength and there were marked interindividual differences. The use of a mixed longitudinal design allowed a faster data collection process; in addition, multilevel modeling analysis was sufficiently flexible and robust to accommodate, in a single model, aspects of individual and interindividual changes in static strength development over the time.
O conhecimento da prevalencia dos factores de risco cardiovascular e fundamental no acompanhament... more O conhecimento da prevalencia dos factores de risco cardiovascular e fundamental no acompanhamento do processo de transicao epidemiologica pelo qual atravessam paises como Mocambique. Os resultados obtidos num inquerito nacional de 2005 demonstraram que a hipertensao arterial era o factor mais importante, a diabetes e a obesidade ainda nao eram preocupantes, mas o consumo de tabaco e alcool eram excessivos. Por outro lado, os niveis de actividade fisica eram elevados, embora nas cidades existisse uma prevalencia importante de sedentarismo. Um novo inquerito nacional foi realizado em 2015, mas os seus resultados nao estao disponiveis. Considerando-se a relacao entre actividade/aptidao fisica e risco cardiovascular, os estudos observacionais com criancas/adolescentes relataram relacao inversa tanto na zona rural quanto na urbana. Entre os adultos, essa relacao inversa foi observada apenas com a obesidade. Nos estudos de intervencao, uma sessao aguda de exercicio resistido reduziu a pr...
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](Arquivos Brasileiros De Cardiologia, 2010
Revista Brasileira de Ciências do Esporte, 2000
A prescricao de treinamento fisico (TF) baseada nos limiares ventilatorios determinados por avali... more A prescricao de treinamento fisico (TF) baseada nos limiares ventilatorios determinados por avaliacoes ergoespirometricas, tem sido muito util para atletas. O objetivo do presente estudo foi verificar o efeito de um curto periodo de TF, baseado nos limiares ventilatorios na capacidade fisica de jogadores de voleibol. Seis jogadores de voleibol (25± 4 anos) do sexo masculino foram estudados durante a fase competitiva do Campeonato Estadual. Os jogadores foram submetidos a duas avaliacoes ergoespirometricas maxima em esteira com um intervalo de tres meses. Nesse periodo, o treinamento aerobico foi desenvolvido numa intensidade entre o limiar anaerobico e o ponto de compensacao respiratoria, e o treinamento anaerobico foi realizado em uma intensidade acima do ponto de compensacao respiratoria. O TF causou um aumento significante no consumo maximo de oxigenio (48,0±2,9 vs. 51,0 ±3,1 ml. Kg. – min-1, P
Movement Disorders, 2015
This study assessed 1) the effects of 12 wk of resistance training (RT) and resistance training w... more This study assessed 1) the effects of 12 wk of resistance training (RT) and resistance training with instability (RTI) on presynaptic inhibition (PSI) and disynaptic reciprocal inhibition (DRI) of patients with Parkinson’s disease (PD); 2) the effectiveness of RT and RTI in moving PSI and DRI values of patients toward values of age-matched healthy controls (HC; Z-score analysis); and 3) associations between PSI and DRI changes and clinical outcomes changes previously published. Thirteen patients in RT group, 13 in RTI group, and 11 in a nonexercising control group completed the trial. While RT and RTI groups performed resistance exercises twice a week for 12 wk, only the RTI group used unstable devices. The soleus H reflex was used to evaluate resting PSI and DRI before and after the experimental protocol. The HC ( n = 31) was assessed at pretest only. There were significant group × time interactions for PSI ( P < 0.0001) and DRI ( P…
Journal of Human Hypertension
Post-exercise hypotension (PEH) is a clinically relevant phenomenon, but its mechanisms vary betw... more Post-exercise hypotension (PEH) is a clinically relevant phenomenon, but its mechanisms vary between different studies and between the participants within each study. Additionally, it is possible that PEH mechanisms are not consistent in each individual (i.e. within-individual variation), which has not been investigated yet. Thus, the aim of the current study was to assess the within-individual consistency of PEH hemodynamic and autonomic mechanisms. For that, 30 subjects performed 4 sessions divided in 2 blocks (test and retest). In each block, an exercise (cycling, 45 min, 50%VO2peak) and a control (seated rest, 45 min) session was randomly conducted. Blood pressure (BP) and its mechanisms were evaluated pre- and post-interventions. In each block, individual responses were calculated as post-exercise minus post-control, and a response was considered present when its magnitude reached the typical error of the measurement. Consistencies were evaluated by comparing test and retest responses through kappa coefficient (k). PEH consistency was calculated using role sample, while mechanisms consistency was evaluated in those with consistent PEH. Twenty-one (70%) participants showed consistent PEH, 5 (17%) presented PEH in only test or retest and 4 (13%) had absent PEH response, characterising a good consistency (k = 0.510). Regarding mechanisms’ responses, good consistency was found for heart rate (k = 0.456), sympathovagal balance (k = 0.438), and baroreflex sensitivity (k = 0.458); while systemic vascular resistance (k = 0.152), cardiac output (k = −0.400), stroke volume (k = −0.055), and sympathetic vasomotor modulation (k = −0.096) presented marginal consistencies. Thus, PEH is a highly consistent physiological phenomenon, although its mechanisms present variable consistencies.
Current Hypertension Reports
To elucidate the hemodynamic, autonomic, vascular, hormonal, and local mechanisms involved in the... more To elucidate the hemodynamic, autonomic, vascular, hormonal, and local mechanisms involved in the blood pressure (BP)–lowering effect of dynamic resistance training (DRT) in prehypertensive and hypertensive populations. The systematic search identified 16 studies involving 17 experimental groups that assessed the DRT effects on BP mechanisms in prehypertensive and/or hypertensive populations. These studies mainly enrolled women and middle-aged/older individuals. Vascular effects of DRT were consistently reported, with vascular conductance, flow-mediated dilation, and vasodilatory capacity increases found in all studies. On the other hand, evidence regarding the effects of DRT on systemic hemodynamics, autonomic regulation, hormones, and vasoactive substances are still scarce and controversial, not allowing for any conclusion. The current literature synthesis shows that DRT may promote vascular adaptations, improving vascular conductance and endothelial function, which may have a role in the BP-lowering effect of this type of training in prehypertensive and hypertensive individuals. More studies are needed to explore the role of other mechanisms in the BP-lowering effect of DRT.
Revista Paulista de Educação Física, Dec 20, 1999
einstein (São Paulo), 2021
Objective: To evaluate the effects of resistance training on metabolic and cardiovascular respons... more Objective: To evaluate the effects of resistance training on metabolic and cardiovascular responses during maximal cardiopulmonary exercise testing in patients with Parkinson’s disease. Methods: Twenty-four patients with Parkinson’s disease (modified Hoehn and Yahr stages 2 to 3) were randomly assigned to one of two groups: Control or Resistance Training. Patients in the Resistance Training Group completed an exercise program consisting of five resistance exercises (two to four sets of six to 12 repetitions maximum per set) twice a week. Patients in the Control Group maintained their usual lifestyle. Oxygen uptake, systolic blood pressure and heart rate were assessed at rest and during cycle ergometer-based maximal cardiopulmonary exercise testing at baseline and at 12 weeks. Assessments during exercise were conducted at absolute submaximal intensity (slope of the linear regression line between physiological variables and absolute workloads), at relative submaximal intensity (anaero...
Revista Brasileira de Educação Física e Esporte, Aug 8, 2017
Arquivos Brasileiros de Cardiologia, 1998
Purpose-Heart rate variability (HRV) has been studied at rest as a non-invasive tool for the asse... more Purpose-Heart rate variability (HRV) has been studied at rest as a non-invasive tool for the assessment of cardiac autonomic control and, its attenuation is related to cardiovascular risk. However, during exercise, when important neural changes take place, HRV behaviour is not well established. The aim of this investigation was to study the heart rate (HR) and HRV responses during the different metabolic phases of maximal graded exercise in young men. Methods-Seventeen men (age 28±6 years) were submitted to a graded cardiopulmonary exercise test in a cycloergometer (30W/3min). To study HR and HRV (standard-deviation), the eletrocardiographic signal was amplified and acquired beat-to-beat in a computer at a frequency of 125 Hz (AT/Codas). Results-The HR increases concomitantly to the increase in exercise intensity. The HRV was significantly lower than rest values after exercise intensities of 60% of peak exercise oxygen uptake, 45-60% of maximal power and, after anaerobic threshold intensity. Conclusion-This results suggest that HRV measured by standard deviation of HR decreases during exercise phases when HR increment is determined mainly due to vagal withdrawal.
The main aim of this study was to introduce the use of multilevel modeling in the data from a mix... more The main aim of this study was to introduce the use of multilevel modeling in the data from a mixed longitudinal study concerning growth, development and health of Portuguese adolescents. The sample comprises 5155 subjects from 4 age cohorts: 10 to 12, 12 to 14, 14 to 16 and 16 to 18 years. Variables chosen for analysis were handgrip strength and percentage of total body fat. Multilevel modeling analysis showed a quadratic trajectory of adolescents' handgrip strength performance, with higher annual increasing in boys. The percentage of total body fat was positively associated with the static strength and there were marked interindividual differences. The use of a mixed longitudinal design allowed a faster data collection process; in addition, multilevel modeling analysis was sufficiently flexible and robust to accommodate, in a single model, aspects of individual and interindividual changes in static strength development over the time.
O conhecimento da prevalencia dos factores de risco cardiovascular e fundamental no acompanhament... more O conhecimento da prevalencia dos factores de risco cardiovascular e fundamental no acompanhamento do processo de transicao epidemiologica pelo qual atravessam paises como Mocambique. Os resultados obtidos num inquerito nacional de 2005 demonstraram que a hipertensao arterial era o factor mais importante, a diabetes e a obesidade ainda nao eram preocupantes, mas o consumo de tabaco e alcool eram excessivos. Por outro lado, os niveis de actividade fisica eram elevados, embora nas cidades existisse uma prevalencia importante de sedentarismo. Um novo inquerito nacional foi realizado em 2015, mas os seus resultados nao estao disponiveis. Considerando-se a relacao entre actividade/aptidao fisica e risco cardiovascular, os estudos observacionais com criancas/adolescentes relataram relacao inversa tanto na zona rural quanto na urbana. Entre os adultos, essa relacao inversa foi observada apenas com a obesidade. Nos estudos de intervencao, uma sessao aguda de exercicio resistido reduziu a pr...
Arquivos Brasileiros De Cardiologia, 2010
Revista Brasileira de Ciências do Esporte, 2000
A prescricao de treinamento fisico (TF) baseada nos limiares ventilatorios determinados por avali... more A prescricao de treinamento fisico (TF) baseada nos limiares ventilatorios determinados por avaliacoes ergoespirometricas, tem sido muito util para atletas. O objetivo do presente estudo foi verificar o efeito de um curto periodo de TF, baseado nos limiares ventilatorios na capacidade fisica de jogadores de voleibol. Seis jogadores de voleibol (25± 4 anos) do sexo masculino foram estudados durante a fase competitiva do Campeonato Estadual. Os jogadores foram submetidos a duas avaliacoes ergoespirometricas maxima em esteira com um intervalo de tres meses. Nesse periodo, o treinamento aerobico foi desenvolvido numa intensidade entre o limiar anaerobico e o ponto de compensacao respiratoria, e o treinamento anaerobico foi realizado em uma intensidade acima do ponto de compensacao respiratoria. O TF causou um aumento significante no consumo maximo de oxigenio (48,0±2,9 vs. 51,0 ±3,1 ml. Kg. – min-1, P
Movement Disorders, 2015
This study assessed 1) the effects of 12 wk of resistance training (RT) and resistance training w... more This study assessed 1) the effects of 12 wk of resistance training (RT) and resistance training with instability (RTI) on presynaptic inhibition (PSI) and disynaptic reciprocal inhibition (DRI) of patients with Parkinson’s disease (PD); 2) the effectiveness of RT and RTI in moving PSI and DRI values of patients toward values of age-matched healthy controls (HC; Z-score analysis); and 3) associations between PSI and DRI changes and clinical outcomes changes previously published. Thirteen patients in RT group, 13 in RTI group, and 11 in a nonexercising control group completed the trial. While RT and RTI groups performed resistance exercises twice a week for 12 wk, only the RTI group used unstable devices. The soleus H reflex was used to evaluate resting PSI and DRI before and after the experimental protocol. The HC ( n = 31) was assessed at pretest only. There were significant group × time interactions for PSI ( P < 0.0001) and DRI ( P…
Journal of Human Hypertension
Post-exercise hypotension (PEH) is a clinically relevant phenomenon, but its mechanisms vary betw... more Post-exercise hypotension (PEH) is a clinically relevant phenomenon, but its mechanisms vary between different studies and between the participants within each study. Additionally, it is possible that PEH mechanisms are not consistent in each individual (i.e. within-individual variation), which has not been investigated yet. Thus, the aim of the current study was to assess the within-individual consistency of PEH hemodynamic and autonomic mechanisms. For that, 30 subjects performed 4 sessions divided in 2 blocks (test and retest). In each block, an exercise (cycling, 45 min, 50%VO2peak) and a control (seated rest, 45 min) session was randomly conducted. Blood pressure (BP) and its mechanisms were evaluated pre- and post-interventions. In each block, individual responses were calculated as post-exercise minus post-control, and a response was considered present when its magnitude reached the typical error of the measurement. Consistencies were evaluated by comparing test and retest responses through kappa coefficient (k). PEH consistency was calculated using role sample, while mechanisms consistency was evaluated in those with consistent PEH. Twenty-one (70%) participants showed consistent PEH, 5 (17%) presented PEH in only test or retest and 4 (13%) had absent PEH response, characterising a good consistency (k = 0.510). Regarding mechanisms’ responses, good consistency was found for heart rate (k = 0.456), sympathovagal balance (k = 0.438), and baroreflex sensitivity (k = 0.458); while systemic vascular resistance (k = 0.152), cardiac output (k = −0.400), stroke volume (k = −0.055), and sympathetic vasomotor modulation (k = −0.096) presented marginal consistencies. Thus, PEH is a highly consistent physiological phenomenon, although its mechanisms present variable consistencies.
Current Hypertension Reports
To elucidate the hemodynamic, autonomic, vascular, hormonal, and local mechanisms involved in the... more To elucidate the hemodynamic, autonomic, vascular, hormonal, and local mechanisms involved in the blood pressure (BP)–lowering effect of dynamic resistance training (DRT) in prehypertensive and hypertensive populations. The systematic search identified 16 studies involving 17 experimental groups that assessed the DRT effects on BP mechanisms in prehypertensive and/or hypertensive populations. These studies mainly enrolled women and middle-aged/older individuals. Vascular effects of DRT were consistently reported, with vascular conductance, flow-mediated dilation, and vasodilatory capacity increases found in all studies. On the other hand, evidence regarding the effects of DRT on systemic hemodynamics, autonomic regulation, hormones, and vasoactive substances are still scarce and controversial, not allowing for any conclusion. The current literature synthesis shows that DRT may promote vascular adaptations, improving vascular conductance and endothelial function, which may have a role in the BP-lowering effect of this type of training in prehypertensive and hypertensive individuals. More studies are needed to explore the role of other mechanisms in the BP-lowering effect of DRT.
Revista Paulista de Educação Física, Dec 20, 1999
einstein (São Paulo), 2021
Objective: To evaluate the effects of resistance training on metabolic and cardiovascular respons... more Objective: To evaluate the effects of resistance training on metabolic and cardiovascular responses during maximal cardiopulmonary exercise testing in patients with Parkinson’s disease. Methods: Twenty-four patients with Parkinson’s disease (modified Hoehn and Yahr stages 2 to 3) were randomly assigned to one of two groups: Control or Resistance Training. Patients in the Resistance Training Group completed an exercise program consisting of five resistance exercises (two to four sets of six to 12 repetitions maximum per set) twice a week. Patients in the Control Group maintained their usual lifestyle. Oxygen uptake, systolic blood pressure and heart rate were assessed at rest and during cycle ergometer-based maximal cardiopulmonary exercise testing at baseline and at 12 weeks. Assessments during exercise were conducted at absolute submaximal intensity (slope of the linear regression line between physiological variables and absolute workloads), at relative submaximal intensity (anaero...
Revista Brasileira de Educação Física e Esporte, Aug 8, 2017