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International audience; In addition to exercise intolerance and a sedentary lifestyle, functional capacity, referring to an individual’s balance, mobility, and transfer abilities, is particularly altered in end-stage disease,1 conferring a high risk for disability, hospitalization, and mortality.2,3 The situation may even be worse in individuals who develop hypoxemic or hypercapnic chronic respiratory failure, that could lead to a stage of vulnerability and physical dependence called frailty.4 Frailty syndrome affects approximatively 1 in 5 patients with chronic obstructive pulmonary disease (COPD),5 with an increasing proportion of frail individuals in the most severe stages of the disease. 6,7 Frail patients with COPD are at higher risk of disability and falls, exercise intolerance, anxiety and depressive symptoms, hospitalizations, and death compared to their non-frail counterparts.6,7Pulmonary rehabilitation (PR) is highly effective at improving dyspnea, exercise tolerance, and health status in patients with moderate to severe COPD.8-10 Although less documented, center-based PR is feasible and has shown similar benefits in COPD patients with chronic respiratory failure.11-13 However, PR attendance and completion are likely compromised in frail individuals with chronic respiratory failure,6,14 to whom a home-based intervention could help in eliminating barriers that affect PR attendance.The design of an effective PR program to prevent or delay functional decline and disability in older persons is a public health priority15 that has been addressed in multiple reviews.16,17 This question has received little attention in patients with COPD, although a few studies reported short-term effectiveness of center-based PR programs for improving balance, gait speed, and frailty syndrome in patients with moderate to severe COPD.18-20 Whether similar benefits of PR could be obtained in COPD patients with chronic respiratory failure who are at risk of altered functional status and physical frailty is uncertain. Home-based PR, using exercise and self-managing interventions tailored to each patient’s individual abilities and needs, is an attractive approach for these individuals that could further increase the program completion.21,22 Furthermore, focusing on functional status and autonomy in daily life activities and individualizing physical exercises in frail COPD patients with chronic respiratory disease could enhance the benefits of PR on functional capacity and frailty syndrome.The main objective of this prospective interventional study was to evaluate the effectiveness of an 8-week, home-based PR program with COPD patients with chronic respiratory failure. A secondary objective was to specifically evaluate the impact of frailty status on the efficacy of PR in improving functional capacity, exercise tolerance, health-related quality of life, and anxiety and depressive symptoms.MethodsParticipants and Study DesignThis was a prospective interventional study conducted in the north of France from December 2018 to October 2020. Participants were referred to the home-based PR program by their pulmonologist who was responsible for providing the clinical assessment and certifying the presence of COPD according to the Global initiative for chronic Obstructive Lung Disease (GOLD) classification system.23 Eligible patients were aged 40 years or above with a diagnosis of COPD as a main disease, and had chronic respiratory failure, defined as the requirement for either long-term oxygen therapy (LTOT) and/or non-invasive ventilation (NIV). Exclusion criteria included recent participation in PR (

Sarah Gephine,1,2 Olivier Le Rouzic,3,4 François Machuron,5 Benoit Wallaert,3 Cécile Chenivesse,3,4 Didier Saey,2 François Maltais,2 Patrick Mucci,1 Jean-Marie Grosbois6 1Univ. Lille, Univ. Artois, Univ. Littoral Côte d’Opale, ULR 7369 - URePSSS - Unité de Recherche Pluridisciplinaire Sport Santé Société, Lille F-59000, France; 2Institut Universitaire de Cardiologie et de Pneumologie de Québec, Université Laval, Québec, Canada; 3CHU Lille, Service de Pneumologie et Immuno-Allergologie, Centre de Référence Constitutif des Maladies Pulmonaires Rares, Lille F-59000, France; 4Univ. Lille, Lille F-59000, France; 5Department of Biostatistics, Univ. Lille, CHU Lille, EA 2694 - Santé Publique: Épidémiologie et Qualité des Soins, Lille F-59000, France; 6FormAction Santé, Pérenchies, FranceCorrespondence: Jean-Marie GrosboisFormAction Santé, Pérenchies, Zone d’Activité du Bois, Rue de Pietralunga, Pérenchies, F-59840, FranceEmail jmgrosbois@formactionsante.comBackground: Long-term effectiveness of pulmonary rehabilitation (PR) is still uncertain in older people with severe chronic obstructive pulmonary disease (COPD). The objective was to compare the effects of home-based PR in people with COPD above and below the age of 70 years.Methods: In this retrospective study, 480 people with COPD were recruited and divided into those ≤ 70 (n=341) and those > 70 years of age (n=139). All participants underwent an 8 weeks of home-based PR, consisting of a weekly supervised 90-minute home session. Six-minute stepper test (6MST), timed-up and go test (TUG), Hospital Anxiety and Depression Scale, and Visual Simplified Respiratory Questionnaire (VSRQ) were assessed at baseline (M0), at 2 (M2), 8 (M8), 14 (M14) months after baseline.Results: The older group was described by fewer current smokers (p < 0.001), more long-term oxygen therapy use (p = 0.024), higher prevalence of comorbidities (p< 0.001), lower 6MST score and higher TUG score (p< 0.001), compared to the younger group. Both groups improved every outcome at M2 compared to baseline. At M2, 88% of people ≤ 70 years of age and 79% of those above 70 were considered as responders in at least one evaluated parameter (p = 0.013). Both groups maintained the benefits at M14, except for the VSRQ score and the number of responders to this outcome in the older group.Conclusion: Regardless of the age, personalized home-based PR was effective for people with COPD in the short term. Above 70 years, an ageing effect appeared on the long-term effectiveness of quality of life benefit.Keywords: chronic obstructive pulmonary disease, exercise tolerance, pulmonary rehabilitation, quality of life, older age

Objective Various functional muscle properties affect different aspects of functional exercise capacity in people with chronic obstructive pulmonary disease (COPD). The purpose of this study was to investigate the contribution of quadriceps muscle strength, endurance, and power to 6-Minute Walking Distance (6MWD) and 1-minute sit-to-stand test (1STS) performance in people with COPD. Methods The study was a prospective, multicenter, cross-sectional study. Anthropometrics, Medical Research Council dyspnea scale, lung function, 6MWD, and 1STS number of repetitions were assessed. Isometric quadriceps strength and endurance, isotonic quadriceps endurance, isokinetic quadriceps strength, and power were assessed on a computerized dynamometer while functional quadriceps power was determined during 5 sit-to-stand repetitions. Univariate and multivariate analyses were performed to determine the contribution of functional muscle properties to the 6MWD and the 1STS number of repetitions. Results The study included 70 people with COPD (mean % predicted forced expiratory volume in 1 second = 58.9 [SD = 18.2]). The 6MWD correlated with each functional muscle property except the isometric quadriceps endurance. The number of repetitions during the 1STS correlated with each functional muscle property except isometric measurements. Multivariate models explained 60% and 39% of the variance in the 6MWD and 1STS number of repetitions, respectively, with quadriceps power determined during 5 sit-to-stand repetitions being the muscle functional property with the strongest contribution to the models. Conclusion Except for isometric endurance, quadriceps strength, endurance, and power were associated with functional exercise capacity in people with moderate COPD. Among these functional muscle properties, muscle power contributed the most to the 6MWD and 1STS number of repetitions, suggesting that muscle power is more relevant to functional exercise capacity than muscle strength or endurance in people with COPD. Impact Understanding the individual contribution of muscle properties to functional status is important to designing interventions. This study provides the guidance that muscle power may be more important to functional exercise capacity than muscle strength or endurance in people with COPD.

Sarah Gephine,1,2 Patrick Mucci,1 Jean-Marie Grosbois,3 François Maltais,2 Didier Saey2 1University Lille, University Artois, University Littoral Côte d’Opale, ULR 7369 - URePSSS - Unité de Recherche Pluridisciplinaire Sport Santé Société, Lille, F-59000, France; 2Centre de Recherche, Institut Universitaire de Cardiologie et de Pneumologie de Québec, Université Laval, Québec, Canada; 3Formaction Santé, Pérenchies, FranceCorrespondence: Didier SaeyInstitut Universitaire de Cardiologie et de Pneumologie de Québec, Université Laval, 2725 Chemin Sainte-Foy, Québec, QC, G1V 4G5 CanadaEmail Didier.saey@rea.ulaval.caBackground: The prevalence of physical frailty and its clinical characteristics in advanced chronic obstructive pulmonary disease (COPD) is unknown, as well as the usefulness of functional capacity tests to screen for physical frailty. The aim of the study was to evaluate the proportion and clinical portrait of COPD patients with chronic respiratory failure exhibiting physical frailty at the time of referral to home-based pulmonary rehabilitation. We also evaluate the usefulness of the short physical performance battery (SPPB) and timed-up and go (TUG) as potential screening tools for physical frailty. Finally, we evaluated the specific contribution of gait speed to the frailty Fried total score.Methods: This was a prospective observational study in which physical frailty was defined using Fried criteria (body mass loss, exhaustion, low physical activity, slower walking and weakness). Clinical portrait was documented from daily physical activity, exercise tolerance, functional capacity, anxiety and depressive symptoms, health-related quality of life, and fatigue scores. The ability of the SPPB and TUG to predict physical frailty was investigated using receiver operating characteristic curves. Contribution of each Fried criteria was evaluated with a principal component analysis (PCA).Results: Amongst the 44 included participants (FEV1, 33 ± 13% of predicted), 19 were physically frail. Frail individuals had lower daily steps number, exercise tolerance and functional capacity, and higher fatigue, anxiety, and depressive symptom scores (p< 0.05) compared to non-frail individuals. SPPB and TUG did not have an acceptable detection accuracy for screening physical frailty. PCA indicated that gait speed was the main contributor to the Fried total score of physical frailty.Conclusion: Physical frailty affects a large proportion of COPD patients with chronic respiratory failure starting a home-based intervention and was associated with worse clinical status. Although the present results need to be confirmed by adequately powered studies, gait speed seems to have the potential to become a simple screening tool for physical frailty in this population.Keywords: frailty, chronic respiratory failure, pulmonary rehabilitation, gait speed

Knowledge about modifiable determinants of daily physical activity (PA) in patients with chronic obstructive pulmonary disease (COPD) is crucial to design effective PA interventions. The present study aimed to determine the contribution of quadriceps strength, power and endurance to daily PA in COPD. Additionally, for quadriceps endurance, we also aimed to determine to what extent the association varies according to the mode of movement (isotonic, isometric, or isokinetic). Using a multicentre cross-sectional trial design we determined the contribution of quadriceps function to daily PA (steps, sedentary time and time spent doing moderate-to-very-vigorous physical activity [MVPA]) using bivariate and partial Pearson correlation analysis (r) and multiple linear regression models (ΔR2). Pre-determined controlling factors were sex, age, body mass index (BMI), COPD-assessment test, forced expiratory volume in one second in percent of the predicted value (FEV1pred), and distance walked on the 6-minute walk test. Eighty-one patients with COPD (mean ± SD: age 67 ± 8 years, FEV1pred 57 ± 19%, daily steps 4968 ± 3319, daily sedentary time 1016 ± 305 min, and MVPA time 83 ± 45 min) were included. Small to moderate bivariate correlations (r = .225 to .452, p 2 = .04 [relative improvement 13%] p = .026), daily sedentary time (ΔR2 = .07 [23%], p = .005) and MVPA-minutes (ΔR2 = .08 [20%], p = .001). Isotonic endurance was also independently associated with most PA variables, even when controlling for strength, power or isometric-isokinetic endurance properties of the muscle (r = .246 to .384, p p > .05). To conclude, strength, power, and endurance properties of the quadriceps were low to moderately associated with PA in patients with COPD. Isotonic quadriceps endurance was the only quadriceps property that was independently associated with the different measures of PA after controlling for a basic set of known determinants of PA, quadriceps strength or power, or isometric or isokinetic quadriceps endurance. Future longitudinal studies should investigate its potential as a modifiable determinant of PA.

Pulmonary rehabilitation, whether performed at home or in a specialised centre, is effective in the management of COPD. As gender-related differences in COPD were previously reported, we aimed to evaluate the impact of gender on pulmonary rehabilitation outcomes in the short, medium and long term. In this retrospective observational study of 170 women and 310 men with COPD, we compared the outcomes of an 8-week home-based pulmonary rehabilitation programme including an individualised plan of retraining exercises, physical activities, therapeutic education, and psychosocial and self-management support. Exercise tolerance, anxiety, depression, and quality of life (QOL) were assessed using the 6-min stepper test (6MST), Hospital Anxiety and Depression Scale (HADS) and Visual Simplified Respiratory Questionnaire (VSRQ), respectively. Assessments were carried out before, immediately after the pulmonary rehabilitation programme (T2) and at 8 (T8) and 14 months (T14). At baseline, women were younger (mean 62.1 versus 65.3 years), more often nonsmokers (24.7% versus 7.7%) and had a higher body mass index (28 versus 26.4 kg·m−2). They more often lived alone (50.6% versus 24.5%) and experienced social deprivation (66.7% versus 56.4%). They had significantly lower exercise tolerance (−34 strokes, 6MST) and higher anxiety and depression (+3.2 HADS total score), but there were no between gender differences in QOL (VSRQ). Both groups showed similar improvements in all outcome measures at T2, T8 and T14 with a tendency for men to lose QOL profits over time. Despite some differences in baseline characteristics, women and men with COPD had similar short-, medium- and long-term benefits of a home-based pulmonary rehabilitation programme., Despite some differences in baseline characteristics, women and men with COPD had similar short-, medium- and long-term benefits of a home-based pulmonary rehabilitation programme https://bit.ly/2XfFakK

Method: Physical frailty affects 25% of people with moderate COPD referred for pulmonary rehabilitation (PR). Effects of PR on frail status remains to be demonstrated, particularly in patients with advanced disease. The aim of the study was to assess the effects of home-based PR on physical frailty in people with severe COPD and chronic respiratory failure (CRF). Methods: 43 participants with COPD and CRF (mean age: 66±8 years, FEV1% predicted: 33±13) underwent 8 weeks of home-based PR consisting in one-weekly supervised home session. Physical frailty was defined using Fried criteria (weight loss, exhaustion, low physical activity, slower walking and weakness). 6-minute stepper test (6MST), short physical performance battery (SPPB) test, fatigue assessment scale (FAS) and hospital anxiety and depression (HAD) questionnaire were assessed before and after PR. Results: At baseline, 19 (44%) participants were frail. Exhaustion (89%) and low physical activity (74%) were the most common markers of frailty found in this population. Frailty syndrome was associated with anxiety and depression (r=0.47, p Conclusion: Physical frailty affects a large number of people with severe COPD and CRF, referred for home-based PR and it is associated with more fatigue, anxiety-depression and functional capacity limitation. However, 80% of people who were frail reversed the syndrome after PR.

Method: Effectiveness of pulmonary rehabilitation (PR) is still uncertain in elderly people with severe COPD, particularly those with chronic respiratory failure (CRF). The aim of this study was to determine whether being elderly impacts the short and long-term effects of a home-based PR in people with COPD and CRF. Methods: In this retrospective study, 480 people with COPD and CRF were divided into those ≤ 70 (n=341) and those > 70 years of age (n=139). All participants underwent 8-weeks of home-based PR, consisting in one-weekly individualized home session. Six-minute stepper test (6MST), timed-up and go test (TUG), hospital anxiety and depression scale, and visual simplified respiratory questionnaire (VSRQ) were assessed at baseline (T0), and at 2 (T2) and 14 (T14) months after baseline. Individuals improving beyond the clinically important difference for at least one of these variables were considered responders to PR. Results: The older group was characterized by less current smokers (p Conclusion: Regardless of the age, individualized home-based PR was effective for people with COPD and CRF at short and long term, with the exception of VSRQ score whose initial improvement was lost at T14.

International audience; Purpose: This study aimed to assess the cardiorespiratory response during a 1-min sit-to-stand test (1STS) in comparison with cycling cardiopulmonary exercise test (CPET) in people with chronic obstructive pulmonary disease (COPD) and in healthy subjects and to evaluate whether 1STS may induce leg fatigue in these individuals. Methods: Fourteen people with severe COPD and 12 healthy subjects performed a 1STS and a CPET during which cardiorespiratory response, perception of dyspnea, and leg fatigue were assessed. Quadriceps strength was assessed before and after 1STS, and contractile fatigue was defined as a postexercise fall in quadriceps twitch force greater than 15% of resting values. Results: In COPD, peak VO2, VE, and HR achieved during 1STS reached 113%, 103%, and 93% of the corresponding values during CPET, respectively. Decrease in SpO2 from preexercise to peak exercise and the magnitude of dynamic hyperinflation were similar between 1STS and CPET. Borg dyspnea and leg fatigue scores were higher for CPET than 1STS. In healthy subjects, peak cardiorespiratory demand and symptom scores were higher during CPET compared with 1STS. A VO2 overshoot during recovery was observed only in people withCOPD. After 1STS, the V˙ O2 half-time recovery of COPD was 152 ± 25 s compared with 74 ± 18 in healthy subjects (P < 0.01). Ten people with COPD and five healthy subjects were considered as fatiguers. Conclusion: The 1STS induced a similar cardiorespiratory stress to that of CPET and was associated with contractile quadriceps fatigue in people with severe COPD. The VO2 overshoot and slower recovery time of cardiorespiratory variables seen in COPD demonstrate the clinical relevance of monitoring the recovery phase of exercise.

Introduction: In addition to impaired lung function, patients with COPD often exhibit limb muscle dysfunction and impaired functional status, negatively impacting quality of life. However, whether ...

Despite its clinical relevance, there is no consensus on how to measure quadriceps muscle endurance in people with COPD. Moreover, the reliability of available measurement strategies are only partl ...

Contains fulltext : 207178.pdf (Publisher’s version ) (Open Access) The aims were to determine reliability and feasibility of measurements to assess quadriceps endurance in people with chronic obstructive pulmonary disease. Sixty participants (forced expiratory volume in one second (mean +/- standard deviation) 55 +/- 18% of predicted, age 67 +/- 8 years) were tested in an inter-day, test-retest design. Isokinetic, isometric, and isotonic protocols were performed using a computerized dynamometer. Test-retest relative and absolute reliability was determined via intraclass correlation coefficient (ICC), coefficient of variation (CV%), and limits of agreement (LoA%). Isokinetic total work demonstrated very high relative reliability (ICC: [95% confidence interval] = 0.98 [0.94-0.99]) and the best absolute reliability (CV% (LoA%) = 6.5% (18.0%)). Isokinetic fatigue index, isometric, and isotonic measures demonstrated low-to-high relative reliability (ICC = 0.64 [0.46-0.77], 0.88 [0.76-0.94], 0.91 [0.85-0.94]), and measures of absolute reliability (CV% (LoA%)) were 20.3% (56.4%), 14.9% (40.8%), and 15.8% (43.1%). For isokinetic total work and isometric measurements, participants performed better on retest (4.8% and 10.0%, respectively). The feasibility was similar across protocols with an average time consumption of less than 7.5 minutes. In conclusion, isokinetic, isometric, and isotonic measurements of quadriceps endurance were feasible to a similar extent and presented low-to-very high relative reliability. Absolute reliability seems to favor isokinetic total work measurements.