Characteristics of individuals with moderate to severe asthma who better respond to aerobic training: a cluster analysis.

OBJECTIVE: To determine the characteristics of individuals with asthma who are responsive to aerobic training. METHODS: This post hoc analysis of pooled data from previous randomized controlled trials involved 101 individuals with moderate to severe asthma who underwent aerobic training. Participants underwent a maximal cardiopulmonary exercise test and completed the Asthma Control Questionnaire and the Asthma Quality of Life Questionnaire before and after a 24-session aerobic training program. Better and worse responders to aerobic training were identified by cluster analysis. RESULTS: Two clusters were identified according to the improvement in peak VO2 after aerobic training (better and worse responders). Characteristics of the better responder group were being older, being female, having higher BMI, and having higher cardiac reserve at baseline when compared with the worse responder group. Also, better responders had worse clinical control, worse quality of life, and lower physical capacity at baseline. After training, worse responders, in comparison with better responders, showed half the improvement in Δpeak VO2 (7.4% vs. 13.6%; 95% CI, -12.1 to -0.92%; p < 0.05) and worse asthma control. A weak, negative, but significant association (r = -0.35; p < 0.05) was observed between clinical control and aerobic fitness only in the better responder group. Both groups showed significant improvement in quality of life. CONCLUSIONS: Obese individuals with worse exercise capacity, clinical control, and quality of life showed improvement with aerobic training. Moreover, worse responders also improved with training, but to a lesser extent.

Characteristics of individuals with moderate to severe asthma who better respond to aerobic training: a cluster analysis / Características de indivíduos com asma moderada a grave que melhor respondem a treinamento aeróbio: análise de conglomerados

ABSTRACT Objective: To determine the characteristics of individuals with asthma who are responsive to aerobic training. Methods: This post hoc analysis of pooled data from previous randomized controlled trials involved 101 individuals with moderate to severe asthma who underwent aerobic training. Participants underwent a maximal cardiopulmonary exercise test and completed the Asthma Control Questionnaire and the Asthma Quality of Life Questionnaire before and after a 24-session aerobic training program. Better and worse responders to aerobic training were identified by cluster analysis. Results: Two clusters were identified according to the improvement in peak VO2 after aerobic training (better and worse responders). Characteristics of the better responder group were being older, being female, having higher BMI, and having higher cardiac reserve at baseline when compared with the worse responder group. Also, better responders had worse clinical control, worse quality of life, and lower physical capacity at baseline. After training, worse responders, in comparison with better responders, showed half the improvement in Δpeak VO2 (7.4% vs. 13.6%; 95% CI, −12.1 to −0.92%; p < 0.05) and worse asthma control. A weak, negative, but significant association (r = −0.35; p < 0.05) was observed between clinical control and aerobic fitness only in the better responder group. Both groups showed significant improvement in quality of life. Conclusions: Obese individuals with worse exercise capacity, clinical control, and quality of life showed improvement with aerobic training. Moreover, worse responders also improved with training, but to a lesser extent.

RESUMO Objetivo: Determinar as características de indivíduos com asma responsivos a treinamento aeróbio. Métodos: Esta análise post hoc de dados agrupados provenientes de ensaios clínicos controlados randomizados anteriores envolveu 101 indivíduos com asma moderada a grave submetidos a treinamento aeróbico. Os participantes foram submetidos a um teste de exercício cardiopulmonar máximo e responderam ao Asthma Control Questionnaire e ao Asthma Quality of Life Questionnaire antes e depois de um programa de treinamento aeróbio de 24 sessões. Melhores e piores respondedores ao treinamento aeróbio foram identificados por análise de conglomerados. Resultados: Foram identificados dois conglomerados de acordo com a melhora do VO2 de pico após o treinamento aeróbio (melhores e piores respondedores). As características do grupo melhor respondedor foram maior idade, sexo feminino, IMC mais elevado e maior reserva cardíaca basal em comparação com o grupo pior respondedor. Os melhores respondedores também apresentavam pior controle clínico, pior qualidade de vida e menor capacidade física basal. Após o treinamento, os piores respondedores, em comparação com os melhores respondedores, apresentaram metade da melhora no ΔVO2 de pico (7,4% vs. 13,6%; IC95%: -12,1 a -0,92%; p < 0,05) e pior controle da asma. Observou-se uma associação negativa fraca, mas significativa (r = −0,35; p < 0,05) entre controle clínico e aptidão aeróbia apenas no grupo melhor respondedor. Ambos os grupos apresentaram melhora significativa da qualidade de vida. Conclusões: Os indivíduos obesos com pior capacidade de exercício, controle clínico e qualidade de vida apresentaram melhora com o treinamento aeróbio. Além disso, os piores respondedores também melhoraram com o treinamento, mas em menor grau.

Seasonal changes influence the improvement in asthma symptoms by exercise training in subjects with asthma*.

OBJECTIVE: To investigate whether patients with moderate-to-severe asthma who commence an exercise training program in winter or summer show differences in exercise capacity, health-related quality of life (HRQoL) and asthma symptoms. METHODS: Forty-two consecutive subjects visiting the outpatient clinic were enrolled in the 17-week rehabilitation program. One group of patients received the intervention from summer to winter (SWG, n = 21), and the other group participated from winter to summer (WSG, n = 21). Before and after the exercise training program, all patients were evaluated by cardiopulmonary exercise test, pulmonary function test, quality of life questionnaire and a daily diary that evaluated clinical asthma symptoms. RESULTS: After the training period, both groups improved similarly in health-related quality of life (HRQoL) and aerobic capacity. The WSG patients had a greater increase that those in the SWG in asthma symptom-free days (p < 0.05). CONCLUSIONS: Our results indicate that seasonal variations affect the improvement in asthma symptoms after an exercise training program but have no effect on health-related quality of life, exercise capacity or pulmonary function.

Heart rate recovery improvement in patients following acute myocardial infarction: exercise training, ß-blocker therapy or both.

Heart rate recovery (HRR) is a strong mortality predictor. Exercise training (ET) and ß-blocker therapy have significant impact on the HRR of patients following myocardial infarction (MI). However, the combination of ET and ß-blocker therapy, as well as its effectiveness in patients with a more compromised HRR (≤12 bpm), has been under-studied. Male patients (n = 64) post-MI were divided: Training + ß-blocker (n = 19), Training (n = 15), ß-blocker (n = 11) and Control (n = 19). Participants performed an ergometric test before and after 3 months of intervention. HRR was obtained during 5 min of recovery and corrected by the cardiac reserve (HRRcorrCR ). Compared to pre-intervention, HRRcorrCR was significantly increased during the 1st and 2nd minutes of recovery in the Training + ß-blocker group (70·5% and 37·5%, respectively; P<0·05). A significant improvement, lasting from the 1st to the 4th minute of recovery, was also observed in the Training group (47%, 50%, 25% and 8·7%, respectively; P<0·05). In contrast, the ß-blocker group showed a reduction in HRRcorrCR during the 2nd and 3rd minutes of recovery (-21·2% and -16·3%, respectively; P<0·05). In addition, interventions involving ET (Training + ßb, Training) were significantly more effective in patients with a pre-intervention HRR ≤ 12 bpm than for patients with HRR > 12 bpm. Combination of ß-blocker therapy with ET does not compromise the effect of training and instead promotes HRR and aerobic capacity improvement. In addition, this combination is particularly beneficial for individuals presenting with a more compromised HRR. However, chronic administration of ß-blocker therapy alone did not promote improvement in HRR or aerobic capacity.

Heart rate recovery improvement in patients following / therapy or both / acute myocardial infarction: exercise training, b-blocker

Heart rate recovery (HRR) is a strong mortality predictor. Exercise training (ET) and β-blocker therapy have significant impact on the HRR of patients following myocardial infarction (MI). However, the combination of ET and β-blocker therapy, as well as its effectiveness in patients with a more compromised HRR (≤12 bpm), has been under-studied. Male patients (n = 64) post-MI were divided: Training + β-blocker (n = 19), Training (n = 15), β-blocker (n = 11) and Control (n = 19). Participants performed an ergometric test before and after 3 months of intervention. HRR was obtained during 5 min of recovery and corrected by the cardiac reserve (HRRcorrCR ). Compared to pre-intervention, HRRcorrCR was significantly increased during the 1st and 2nd minutes of recovery in the Training + β-blocker group (70·5% and 37·5%, respectively; P 12 bpm. Combination of β-blocker therapy with ET does not compromise the effect of training and instead promotes HRR and aerobic capacity improvement. In addition, this combination is particularly beneficial for individuals presenting with a more compromised HRR. However, chronic administration of β-blocker therapy alone did not promote improvement in HRR or aerobic capacity.

Aerobic training decreases bronchial hyperresponsiveness and systemic inflammation in patients with moderate or severe asthma: a randomised controlled trial.

BACKGROUND: The benefits of aerobic training for the main features of asthma, such as bronchial hyperresponsiveness (BHR) and inflammation, are poorly understood. We investigated the effects of aerobic training on BHR (primary outcome), serum inflammatory cytokines (secondary outcome), clinical control and asthma quality of life (Asthma Quality of Life Questionnaire (AQLQ)) (tertiary outcomes). METHODS: Fifty-eight patients were randomly assigned to either the control group (CG) or the aerobic training group (TG). Patients in the CG (educational programme+breathing exercises (sham)) and the TG (same as the CG+aerobic training) were followed for 3 months. BHR, serum cytokine, clinical control, AQLQ, induced sputum and fractional exhaled nitric oxide (FeNO) were evaluated before and after the intervention. RESULTS: After 12 weeks, 43 patients (21 CG/22 TG) completed the study and were analysed. The TG improved in BHR by 1 doubling dose (dd) (95% CI 0.3 to 1.7 dd), and they experienced reduced interleukin 6 (IL-6) and monocyte chemoattractant protein 1 (MCP-1) and improved AQLQ and asthma exacerbation (p<0.05). No effects were seen for IL-5, IL-8, IL-10, sputum cellularity, FeNO or Asthma Control Questionnaire 7 (ACQ-7; p>0.05). A within-group difference was found in the ACQ-6 for patients with non-well-controlled asthma and in sputum eosinophil and FeNO in patients in the TG who had worse airway inflammation. CONCLUSIONS: Aerobic training reduced BHR and serum proinflammatory cytokines and improved quality of life and asthma exacerbation in patients with moderate or severe asthma. These results suggest that adding exercise as an adjunct therapy to pharmacological treatment could improve the main features of asthma. TRIAL REGISTRATION NUMBER: NCT02033122.

Association between maximal aerobic capacity and psychosocial factors in adults with moderate-to-severe asthma.

BACKGROUND: The symptoms of asthma impair health-related quality of life (HRQoL), increase anxiety and depression and may keep subjects from engaging in physical exercise. Physical inactivity has been related to poor asthma outcomes; however, the association between physical fitness and psychosocial disorders remains poorly understood. OBJECTIVE: To verify the association between aerobic capacity, HRQoL, and psychological distress in adults with moderate or severe persistent asthma who were clinically stable. METHODS: Eighty-eight participants (68 females) with either moderate or severe persistent asthma (age range, 20-60 years) who were under medical treatment for at least 6 months and considered clinically stable were studied. Participants were evaluated on two non-consecutive days. On the first day, the HRQoL, depression and anxiety levels and pulmonary function were assessed. On the second day, subjects underwent cardiopulmonary exercise testing. RESULTS: Using the agglomerative cluster approach, two clusters were identified: 21 participants (24%) were grouped in Cluster 1, and 67 (76%) were grouped in Cluster 2. Asthmatic subjects from Cluster 1 exhibited increased aerobic capacity, better HRQoL and lower depression levels than did subjects in Cluster 2 (p < .05). No difference was observed between the clusters with respect to gender, age, body mass index (BMI) or pulmonary function (p > .05). The discriminant function model exhibits good accuracy (R(2) = 0.79) and predicted 93% of the case allocations. CONCLUSION: Our results suggest an association between reduced exercise capacity, low HRQoL and increases in depressive symptoms in clinically stable asthmatic subjects. These results suggest the need to assess physical fitness and psychosocial distress during asthma treatment and the importance of a multidisciplinary approach.

Objective structured clinical evaluation as an assessment method for undergraduate chest physical therapy students: a cross-sectional study / Avaliação clínica objetiva e estruturada como um método para avaliar estudantes de graduação em fisioterapia respiratória: um estudo transversal

BACKGROUND: The Objective Structured Clinical Evaluation (OSCE) has been considered a reliable method for the evaluation of students' clinical skills in health sciences, but it has been rarely applied in the teaching of physical therapy. OBJECTIVE: To assess the use of the OSCE as a tool to evaluate the abilities of undergraduate chest physical therapy students and to verify the internal consistency of the OSCE exam. METHODS: Forty-seven students were evaluated using two types of exams: the traditional exam and the OSCE. Independent educators elaborated the exams. Each question (traditional) or station (OSCE) was given a score ranging from 0.0 to 2.0; being 10.0 the highest possible score of both exams. The relationship between the total score that were obtained from both exams was analyzed using Bland-Altman analysis and Pearson's correlation coefficient. The internal consistency of the OSCE stations was evaluated by four experienced chest physical therapists and it was tested using Cronbach's alpha. RESULTS: The students' average score on the OSCE ranged from 4.4 to 9.6. The internal consistency of the OSCE stations was considered good (0.7). The agreement between exams was analyzed, and it was determined that the exams are not comparable. Examiners also observed a low agreement between the two exams (r=-0.1; p=0.9). CONCLUSION: Our results showed that OSCE and traditional exams are not interchangeable. The OSCE exam had good internal consistency and is able to evaluate aspects that the traditional exam fails to evaluate.

CONTEXTUALIZAÇÃO: A avaliação clínica objetiva e estruturada (OSCE) é considerada um método confiável para avaliar as competências clínicas de estudantes na área de saúde, entretanto tem sido pouco aplicada no ensino de fisioterapia. OBJETIVO: Analisar o uso da OSCE como uma ferramenta para avaliar as habilidades dos alunos de graduação em fisioterapia respiratória e verificar sua consistência interna. MÉTODOS: Quarenta e sete alunos foram avaliados por meio de dois exames: tradicional e OSCE. As provas foram elaboradas por educadores independentes. Para cada questão (tradicional) ou estação (OSCE), atribuiu-se uma pontuação de 0 a 2. A pontuação máxima possível em ambos os exames foi de 10. As relações entre as pontuações obtidas nos dois exames foram analisadas por meio de Bland-Altman e Correlação de Pearson. A consistência interna das estações da OSCE foi avaliada por quatro fisioterapeutas experientes e foi testada pelo Alfa de Cronbach. RESULTADOS: A pontuação média dos estudantes na OSCE oscilou entre 4,4 e 9,6. A consistência interna das estações da OSCE foi considerada boa (0,7). A concordância entre os exames foi analisada, e determinou-se que os exames não são comparáveis. Os examinadores também observaram uma baixa concordância entre os dois exames (r=-0,1, p=0,9). CONCLUSÃO: Nossos resultados mostraram que a OSCE e o exame tradicional não são intercambiáveis. O exame da OSCE teve uma boa consistência interna, sendo capaz de avaliar aspectos que o exame tradicional não avalia.

Objective structured clinical evaluation as an assessment method for undergraduate chest physical therapy students: a cross-sectional study.

BACKGROUND: The Objective Structured Clinical Evaluation (OSCE) has been considered a reliable method for the evaluation of students' clinical skills in health sciences, but it has been rarely applied in the teaching of physical therapy. OBJECTIVE: To assess the use of the OSCE as a tool to evaluate the abilities of undergraduate chest physical therapy students and to verify the internal consistency of the OSCE exam. METHODS: Forty-seven students were evaluated using two types of exams: the traditional exam and the OSCE. Independent educators elaborated the exams. Each question (traditional) or station (OSCE) was given a score ranging from 0.0 to 2.0; being 10.0 the highest possible score of both exams. The relationship between the total score that were obtained from both exams was analyzed using Bland-Altman analysis and Pearson's correlation coefficient. The internal consistency of the OSCE stations was evaluated by four experienced chest physical therapists and it was tested using Cronbach's alpha. RESULTS: The students' average score on the OSCE ranged from 4.4 to 9.6. The internal consistency of the OSCE stations was considered good (0.7). The agreement between exams was analyzed, and it was determined that the exams are not comparable. Examiners also observed a low agreement between the two exams (r=-0.1; p=0.9). CONCLUSION: Our results showed that OSCE and traditional exams are not interchangeable. The OSCE exam had good internal consistency and is able to evaluate aspects that the traditional exam fails to evaluate.

Analysis of cardiovascular system responses to forced vital capacity in COPD.

BACKGROUND: The forced vital capacity (FVC) test is routinely performed to evaluate pulmonary function in patients with chronic obstructive pulmonary disease (COPD). However, the influence of the FVC maneuver on the cardiovascular system of patients with COPD is poorly understood. OBJECTIVES: To analyze the behavior of heart rate (HR), blood pressure (BP) and heart rate variability (HRV) during the FVC test in COPD patients. METHODS: Nineteen men with COPD (72±7 years, GOLD stage I=3, II=5, III=7 and IV=4 patients) performed the FVC test while having their HR monitored. HRV was assessed in time (rMSSD) and frequency domains (LF, HF and LF/HF) at rest, before and after the best FVC maneuver. BP was measured at rest, immediately before and at the end of the test, as well as 10 minutes after the end of the test. RESULTS: At the beginning of the FVC maneuver, HR decreased (p<0.001) and then increased gradually until the end of the test (p<0.001). After the end of maneuver, HR continued to increase until it reached a peak (p<0.001), and then it fell quickly to below at-rest values (p<0.001) prior to returning to baseline. The BP and HRV indices did not change during the assessment. CONCLUSION: The FVC test influences the behavior of COPD patient HR without changing autonomic control or BP.

Analysis of cardiovascular system responses to forced vital capacity in COPD / Análise das respostas do sistema cardiovascular ao teste de capacidade vital forçada na DPOC

BACKGROUND: The forced vital capacity (FVC) test is routinely performed to evaluate pulmonary function in patients with chronic obstructive pulmonary disease (COPD). However, the influence of the FVC maneuver on the cardiovascular system of patients with COPD is poorly understood. OBJECTIVES: To analyze the behavior of heart rate (HR), blood pressure (BP) and heart rate variability (HRV) during the FVC test in COPD patients. METHODS: Nineteen men with COPD (72±7 years, GOLD stage I=3, II=5, III=7 and IV=4 patients) performed the FVC test while having their HR monitored. HRV was assessed in time (rMSSD) and frequency domains (LF, HF and LF/HF) at rest, before and after the best FVC maneuver. BP was measured at rest, immediately before and at the end of the test, as well as 10 minutes after the end of the test. RESULTS: At the beginning of the FVC maneuver, HR decreased (p<0.001) and then increased gradually until the end of the test (p<0.001). After the end of maneuver, HR continued to increase until it reached a peak (p<0.001), and then it fell quickly to below at-rest values (p<0.001) prior to returning to baseline. The BP and HRV indices did not change during the assessment. CONCLUSION: The FVC test influences the behavior of COPD patient HR without changing autonomic control or BP.

CONTEXTUALIZAÇÃO: O teste de capacidade vital forçada (CVF) é rotineiramente realizado na avaliação da função pulmonar de pacientes com doença pulmonar obstrutiva crônica (DPOC). Entretanto, permanece pouco compreendida a influência do teste de CVF sobre o sistema cardiovascular de pacientes com DPOC. OBJETIVOS: Analisar o comportamento da frequência cardíaca (FC), pressão arterial (PA) e variabilidade da frequência cardíaca (VFC) no teste de CVF na DPOC. MÉTODOS: Dezenove homens com DPOC (72 ± 7 anos, no estágio de gravidade GOLD I=3, II=5, III=7 e IV=4 pacientes) realizaram a manobra de CVF e tiveram sua FC monitorada durante todo o exame, e a VFC analisada nos domínios do tempo (rMSSD) e da frequência (BF, AF e BF/AF) durante o repouso, antes e após a melhor manobra de CVF. A PA foi analisada no repouso, imediatamente ao final da manobra de CVF e 10 minutos após o término de todos os testes. RESULTADOS: Ao início da manobra de CVF, a FC reduziu (p<0,001) e, em seguida, aumentou progressivamente até o final do teste (p<0,001). Após término da manobra, a FC continuou a aumentar até atingir um pico (p<0,001) e depois caiu rapidamente a valores inferiores aos de repouso (p<0,001) e retornou ao seu valor basal. A PA e os índices da VFC não sofreram alterações nos períodos analisados. CONCLUSÃO: O teste de CVF influencia o comportamento da FC, sem alterar o seu controle autonômico, bem como a PA em pacientes com DPOC nos períodos analisados.

Effects of aerobic training on psychosocial morbidity and symptoms in patients with asthma: a randomized clinical trial.

BACKGROUND: Asthma symptoms reduce patients' daily activities, impair their health-related quality of life (HRQoL), and increase their reports of anxiety and depression, all of which seem to be related to a decrease in asthma control. Aerobic exercise training is known to improve aerobic fitness and reduce dyspnea in asthmatics; however, its effect in reducing psychologic distress and symptoms remains poorly understood. We evaluated the role of an aerobic training program in improving HRQoL (primary aim) and reducing psychologic distress and asthma symptoms (secondary aims) for patients with moderate or severe persistent asthma. METHODS: A total of 101 patients were randomly assigned to either a control group or an aerobic training group and studied during the period between medical consultations. Control group patients (educational program plus breathing exercises) (n = 51) and training group patients (educational program plus breathing exercises plus aerobic training) (n = 50) were followed twice a week during a 3-month period. HRQoL and levels of anxiety and depression were quantified before and after treatment. Asthma symptoms were evaluated monthly. RESULTS: At 3 months, the domains (physical limitations, frequency of symptoms, and psychosocial) and total scores of HRQoL significantly improved only in the training group patients (P < .001); the number of asthma-symptom-free days and anxiety and depression levels also significantly improved in this group (P < .001). In addition, a linear relationship between improvement in aerobic capacity and the days without asthma symptoms was observed (r = 0.47; P < .01). CONCLUSIONS: Our results suggest that aerobic training can play an important role in the clinical management of patients with persistent asthma. Further, they may be especially useful for patients with higher degrees of psychosocial distress. TRIAL REGISTRATION: clinicaltrials.gov; Identifier: NCT-00989365.