Slow chest compression acutely reduces dynamic hyperinflation in people with chronic obstructive pulmonary disease: a randomized cross-over trial.

BACKGROUND: Strategies to minimize dynamic hyperinflation (DH) and dyspnea, such as slow chest compression (SCC), are relevant in people with chronic obstructive pulmonary disease (COPD). OBJECTIVES: To analyze the acute effects of SCC after exercise on DH and dyspnea in people with COPD and to identify responders to the technique. METHODS: This is a cross-over study with 40 patients. Two six-minute step tests (6MSTs) were performed followed by a one-minute application of SCC (6MSTSCC) or rest (6MSTCONTROL), at random. End-expiratory lung volume (EELV) and dyspnea were assessed. A difference ≥76 ml in ΔEELV between SCC and control characterized the responders. RESULTS: The performance in 6MSTSCC and 6MSTCONTROL were similar. There was a greater reduction in EELV after 6MSTSCC compared to 6MSTCONTROL (124 ± 193 ml vs. 174 ± 183 ml; p = .049), while there was no difference in change in dyspnea between the SCC and control groups. Twenty-one participants were SCC responders and had higher functional residual capacity [FRC: 5.36 ± 1.09 vs. 4.58 ± 0.94; p = .02; cutoff point: 4.56; sensitivity = 76%; specificity = 53%; AUC = 0.71 (95%CI: 0.54 to 0.87); p = .02]. CONCLUSION: SCC applied immediately after exercise reduced DH, but did not reduce dyspnea in people with COPD. The technique is beneficial only for some patients and FRC can help to identify them.

Functional Tests As Predictors Of Balance, Fear, And Risk Of Falling In Healthy Subjects.

OBJECTIVE: Verify which test, Glitttre-ADL test (TGlittre) or six-minute walk test (6MWT), better predicts balance, fear, and risk of falling in middle-aged and older adults. METHOD: Twenty-eight individuals (15 women) completed the study protocol, which included: anthropometric assessment, spirometry, Falls Efficacy Scale-International-Brazil (FES-I-Brazil), Activities-specific Balance Confidence Scale (ABC), Timed Up and Go Test (TUG), Berg Balance Scale (BBS), TGlittre, and 6MWT. The Shapiro Wilk test investigated the distribution of the data. To verify if there was a correlation between the performance in TGlittre and 6MWT and the balance, fear, and risk of falling variables, the Pearson or Spearman correlation coefficient were used. Simple linear regression and stepwise multiple linear regression were conducted to identify which functional capacity test better predicts balance, fear, and risk of falling. RESULTS: Both TGlittre and 6MWT correlated (r = 0.44, p = .02 and r = -0.59, p = .003, respectively) and were able to predict the TUG (R2 = 0.17 and R2 = 0.26, p < .005, respectively). However, when analyzed in a multiple regression model, the 6MWT was better predictor of TUG (26%). Only TGlittre correlated (r = 0.39 and r = -0.38, p = .04) and was able to predict the FES-I-Brazil and BBS scores (17%), suggesting that TGlittre better reflects the worry about falls and balance in multiple ADL contexts. CONCLUSIONS: The 6MWT and the TGlittre are able to predict balance assessed by the TUG. However, the 6MWT has proved to be more effective in predicting TUG results.

Performance in the Glittre-ADL Test is Associated with the Pulmonary Function of Patients with Chronic Obstructive Pulmonary Disease.

The relationship between lung function and performance in some functional tests, as the six-minute walk test (6MWT) and Glittre-ADL test (TGlittre) are still discrepant in patients with chronic obstructive pulmonary disease (COPD). This study aimed to verify which test better correlates and is better explained by the pulmonary function, and which test better discriminates patients regarding the severity of the disease. Seventy-four patients with moderate to very severe COPD (54 men; 66 ± 9 years; FEV1: 37.2 ± 14.3%pred) were included. Spirometry, 6MWT and TGlittre were performed. The results showed weak to moderate correlation between pulmonary function variables and 6MWT (0.36 ≤ r ≤ 0.45) and TGlittre (-0.44 ≤ r ≤ -0.53). In patients with performance of ≤400 m in the 6MWT, a strong correlation was observed between TGlittre with FEV1 (%pred) (r = -0.82; p < .001). The pulmonary function variable that better predict the functional tests performance was FEV1 (R2 = 0.17). Both functional tests were able to discriminate patients with COPD GOLD 4 from the other classifications. When compared to GOLD 2 patients, GOLD 4 patients presented higher time spent on TGlittre (p < .001). When compared to GOLD 3 patients, GOLD 4 patients had higher TGlittre (p = .001). No statistical differences were found in the 6MWT between GOLD 3 and 4, as well as between GOLD 2 and 3. In conclusion, the pulmonary function presents stronger correlations and better explain the variability of TGlittre than of the 6MWT, especially in patients with greater functional impairment. The TGlittre seems to better discriminate patients with COPD regarding the severity of lung function.

A performance comparison of the 20 and 30 meter six-minute walk tests among middle aged and older adults.

Objective: To compare the performance of the Six-Minute Walk Test on 20-meter (6MWT20) and 30-meter (6MWT30) tracks and to test the validity and reliability of the 6MWT20 in middle-aged and older adults.Method: The subjects underwent lung function assessment and performed the 6MWT30 and 6MWT20. Student´s t-tests or Wilcoxon tests were used to compare the variables. The Pearson or Spearman correlation coefficients were used to evaluate the validity of the 6MWT20 and the reliability of the 6MWT20. The 6MWT30 was tested by the two-way mixed model of the Intraclass Correlation Coefficient (ICC 3,1).Results: Twenty-five subjects (age: 60 ± 10 years) walked, on average, 11.0 ± 21.9 m more in the 6MWT30 than in the 6MWT20 (p < .05). The walking distance, the number of steps, the energy expenditure and the movement intensity between the 6MWT20 and 6MWT30 was correlated (r = 0.95; r = 0.81; r = 0.91; r = 0.67; respectively, p < .001). The walking distances showed high reliability and were similar between test and re-test in the 6MWT30 (544 ± 72.1 vs. 551 ± 70.5; p < .05; ICC = 0.97) and in the 6MWT20 (533 ± 73.1 vs. 532 ± 59.1; p < .05; ICC = 0.87).Conclusion: The 6MWT20 performance is lower than the 6MWT30 However, this difference is not clinically relevant. Additionally, the 6MWT20 is a valid and reproducible test to assess the functional capacity of middle-aged and older adults.

Performance difference on the six-minute walk test on tracks of 20 and 30 meters for patients with chronic obstructive pulmonary disease: validity and reliability.

BACKGROUND: Functional capacity assessment is important in patients with chronic obstructive pulmonary disease (COPD). It can be performed by the six-minute walk test (6MWT) on a 30-meter track. However, such space is not always available in clinical settings. OBJECTIVES: To compare the performance between the 6MWT on a 30- (6MWT30) and 20-meter (6MWT20) track; to evaluate the validity and reliability of the 6MWT30 and the 6MWT20; and to determine for which patients track length has the greatest impact on performance. METHODS: Patients with COPD randomly performed two 6MWT30 and two 6MWT20 on two different days and were also assessed using the COPD Assessment Test (CAT) and modified Medical Research Council (mMRC) scale. RESULTS: Thirty patients (23 men; mean ±â€¯standard deviation FEV1%pred: 45.6 ±â€¯12.1) participated in the study. They walked a greater distance on the 6MWT30 than on the 6MWT20 [mean difference: 22.1 m (95% CI: 12, 32 m)]. The longer the 6MWT30 distance, the greater the difference between the 2 tests (r = 0.51; p = 0.004). The 6MWT20 showed high reliability [ICC: 0.96 (95% CI: 0.77, 0.99)] and the results were associated with the distance walked on the 6MWT30 (r = 0.86), CAT (r = -0.53), and mMRC (r = -0.62). Patients who walked ≥430 m in the 6MWT30 presented a difference between the tests greater than those who walked <430 m (34.5 ±â€¯23.3 m vs. 12.6 ±â€¯24.1 m; respectively; p = 0.01). CONCLUSIONS: Performance was higher on the 6MWT30, with the difference increasing as performance improved. Therefore, the 6MWT20 is valid and reliable to evaluate functional capacity but should not be considered interchangeable with the 6MWT30, especially for the less disabled patients with COPD.

Reproducibility of the 6-Min Step Test in Subjects With COPD.

BACKGROUND: Test-retest reproducibility of the 6-min step test (6MST) is controversial in patients with COPD because the decision to perform a second test is influenced by interruptions, physiological overload, and the patient's exercise tolerance. The aim of this study was to analyze the reproducibility of performance on the 6MST (ie, number of steps climbed and interruptions) and physiological variables in subjects with COPD, with and without poor exercise tolerance, and with and without interruptions during the test. METHODS: Subjects performed 2 6MST (6MST1, 6MST2) with a minimum of 30 min rest between tests. Physiological variables were assessed with a gas analyzer. Subjects who performed ≤ 78 steps in the 6MST1 and ≤ 86 steps in the test with the higher number of steps performed (6MSTBEST) were considered to have poor exercise tolerance. Subjects were also stratified according to those who interrupted the 6MSTBEST and those who did not interrupt the 6MSTBEST. RESULTS: 40 subjects (31 men; FEV1 percent of predicted = 50.4 ± 13.5) participated in the study. The number of steps, interruptions, and physiological variables showed moderate to high reliability (intraclass correlation coefficient: 0.70-0.99, P < .001). Thirty-one (77.5%) subjects had a better performance during 6MST2 than 6MST1 (mean difference: 4.65 ± 5.59, P < .001). Although the number of times subjects were interrupted was similar between the 2 tests (P = .66), the duration of these interruptions was shorter during 6MST2 (mean difference: -0.12 ± 0.39 s, P = .040). The difference in the number of steps (6MST2 - 6MST1) did not differ between subjects who performed ≤78 steps (mean difference: 5.64 ± 5.32 steps; 10.3%; P < 0.001) and ≥ 79 steps (3.00 ± 5.82 steps; 6.13%; P = 0.08) on the 6MST1 (P = 0.15) and between subjects who performed ≤ 86 steps (5.39 ± 5.14 steps; 9.39%; P < 0.001) and ≥ 87 steps (2.92 ± 6.43 steps; 2.74%; P = 0.14) steps on the 6MSTBEST (P = 0.20). CONCLUSIONS: Performance and physiological variables in the 6MST were reproducible, and a second test did not impose greater physiological overload. Two tests were essential for patients with poor exercise tolerance.

The London Chest Activity of Daily Living scale cut-off point to discriminate functional status in patients with chronic obstructive pulmonary disease.

OBJECTIVE: To determine the cut-off point for the London Chest Activity of Daily Living scale in order to better discriminate functional status. Secondarily, to determine which of the scores (total or %total) is better associated with clinical outcomes of a pulmonary rehabilitation program. METHODS: Sixty-one patients with chronic obstructive pulmonary disease performed the following tests: spirometry; Chronic Obstructive Pulmonary Disease Assessment Test; Saint George's Respiratory Questionnaire; modified Medical Research Council, the body-mass index, airflow obstruction, dyspnea, and exercise capacity index; six-minute walk test; physical activity in daily life assessment and London Chest Activity of Daily Living scale. Thirty-eight patients were evaluated pre- and post-pulmonary rehabilitation . The cut-off point was determined using the receiver operating characteristic curve with six-minute walk test (cut-off point: 82%pred), modified Medical Research Council (cut-off point: 2), level of physical (in)activity (cut-off point: 80min per day in physical activity ≥3 metabolic equivalent of task) and presence/absence of severe physical inactivity (cut-off point: 4580 steps per day) as anchors. RESULTS: A cut-off point found for all anchors was 28%: modified Medical Research Council [sensitivity=83%; specificity=72%; area under the curve=0.80]; level of physical (in)activity [sensitivity=65%; specificity=59%; area under the curve=0.67] and classification of severe physical inactivity [sensitivity=70%; specificity=62%; area under the curve=0.70]. The patients who scored ≤28% in %total score of London Chest Activity of Daily Living had lower modified Medical Research Council , Chronic Obstructive Pulmonary Disease Assessment Test, Saint George's Respiratory Questionnaire, body-mass index, airflow obstruction, dyspnea and exercise capacity index and sitting time than who scored >28%, and higher forced expiratory volume in the first second, time in physical activity ≥3 metabolic equivalent of task, steps per day and six-minute walk distance. The %total score of London Chest Activity of Daily Living correlated better with clinical outcomes than the total score. CONCLUSIONS: The cut-off point of 28% is sensitive and specific to distinguish the functional status in patients with chronic obstructive pulmonary disease. The %total score of the London Chest Activity of Daily Living reflects better outcomes of chronic obstructive pulmonary disease when compared to total score.

The Glittre-ADL Test Cut-Off Point to Discriminate Abnormal Functional Capacity in Patients with COPD.

The study objective was to determine a cut-off point for the Glittre activities of daily living (ADL)test (TGlittre) to discriminate patients with normal and abnormal functional capacity. Fifty-nine patients with moderate to very severe COPD (45 males; 65 ± 8.84 years; BMI: 26 ± 4.78 kg/m2; FEV1: 35.3 ± 13.4% pred) were evaluated for spirometry, TGlittre, 6-minute walk test (6 MWT), physical ADL, modified Medical Research Council scale (mMRC), BODE index, Saint George's Respiratory Questionnaire (SGRQ), and COPD Assessment Test (CAT). The receiver operating characteristic (ROC) curve was used to determine the cut-off point for TGlittre in order to discriminate patients with 6 MWT < 82% pred. The ROC curve indicated a cut-off point of 3.5 minutes for the TGlittre (sensitivity = 92%, specificity = 83%, and area under the ROC curve = 0.95 [95% CI: 0.89-0.99]). Patients with abnormal functional capacity had higher mMRC (median difference 1 point), CAT (mean difference: 4.5 points), SGRQ (mean difference: 12.1 points), and BODE (1.37 points) scores, longer time of physical activity <1.5 metabolic equivalent of task (mean difference: 47.9 minutes) and in sitting position (mean difference: 59.4 minutes) and smaller number of steps (mean difference: 1,549 minutes); p < 0.05 for all. In conclusion, the cut-off point of 3.5 minutes in the TGlittre is sensitive and specific to distinguish COPD patients with abnormal and normal functional capacity.

Influência da dor crônica na capacidade funcional do idoso / Influence of chronic pain on functional capacity of the elderly

Justificativa e objetivos: No âmbito das afecções do aparelho locomotor, a dor é o sintoma mais frequente e, além da alta prevalência, sua importância decorre por estar presente nas doenças que causam maior impacto negativo na qualidade de vida e na produtividade dos indivíduos acometidos. O objetivo deste estudo foi investigar tópicos relevantes sobre a influência da dor osteoarticular crônica na capacidade funcional no idoso. Conteúdo: Foi realizado um estudo bibliográfico mediante consulta às principais publicações sobre o tema. O material foi identificado com auxílio das bases eletrônicas de dados da Medline, LILACS, Scielo e Pubmed. Foram empregados os descritores "dor crônica", "doenças osteoarticulares" e "capacidade funcional". Conclusão: Deve haver maior atenção às políticas públicas de implementação de programas que visem principalmente a prevenção e o controle das doenças crônicas osteoarticulares, promovendo funcionalidade e maior qualidade de vida para essa população.

Background and objectives: Among locomotor system diseases, pain is the most frequent symptom and, in addition to its high prevalence, it is important because it is present in diseases causing the highest negative impact on quality of life and productivity of affected individuals. This study aimed at investigating relevant topics on the influence of chronic osteoarticular pain on the functional capacity of the elderly. Contents: A bibliographic study was carried out by querying major publications on the subject. Material was identified with the aid of electronic databases Medline, LILACS, Scielo and Pubmed. Keywords used were "chronic pain", "osteoarticular diseases" and "functional capacity". Conclusion: Further attention should be given to public policies implementing programs aiming especially at preventing and controlling chronic osteoarticular diseases, promoting functionality and better quality of life for this population.