Factors Influencing Activities of Daily Living in Subjects With COPD

Perceived Spousal Support and Activities of Daily Living in Individuals With COPD

BACKGROUND

The relationship between perceived spousal support and activities of daily living in patients with chronic obstructive pulmonary disease (COPD) is unclear.

PURPOSE

The aim of this study was to explore the relationship between spousal support perceived by those with COPD and their activities of daily living.

METHODS

This study was a cross-sectional and descriptive study. Data collection was conducted between September 2022 and April 2023. A Data Gathering Form, the Spousal Support Scale, and the London Chest Activity of Daily Living Scale were used to collect data. A total of 132 adults were included in this study.

RESULTS

The mean (SD) scores of individuals with COPD for perceived spousal support and activities of daily living were 62.40 (14.66) and 32.91 (15.72), respectively. Levels of perceived spousal support and activities of daily living varied according to sex, employment status, admission to the emergency service or hospitalization, use of antidepressants, and the severity of the illness (P < .05). Those with better spousal support felt less dyspnea when performing the activities of daily living (r = -0.205, P < .05).

CONCLUSIONS

Knowing the potential factors affecting perceived spousal support and activities of daily living can provide an opportunity to determine appropriate strategies to increase the level of independence of individuals with COPD. Educational interventions to help spouses understand COPD may help increase spousal support.

A Diagnostic Nomogram for Predicting Hypercapnic Respiratory Failure in Patients with Acute Exacerbation of Chronic Obstructive Pulmonary Disease

Purpose

To develop and validate a nomogram for assessing the risk of developing hypercapnic respiratory failure (HRF) in patients with acute exacerbation of chronic obstructive pulmonary disease (AECOPD).

Patients and Methods

From January 2019 to August 2023, a total of 334 AECOPD patients were enrolled in this research. We employed the Least Absolute Shrinkage and Selection Operator (LASSO) regression and multivariate logistic regression to determine independent predictors and develop a nomogram. This nomogram was appraised by the area under the receiver operating characteristic curve (AUC), calibration curve, Hosmer-Lemeshow goodness-of-fit test (HL test), decision curve analysis (DCA), and clinical impact curve (CIC). The enhanced bootstrap method was used for internal validation.

Results

Sex, prognostic nutritional index (PNI), hematocrit (HCT), and activities of daily living (ADL) were independent predictors of HRF in AECOPD patients. The developed nomogram based on the above predictors showed good performance. The AUCs for the training, internal, and external validation cohorts were 0.841, 0.884, and 0.852, respectively. The calibration curves and HL test showed excellent concordance. The DCA and CIC showed excellent clinical usefulness. Finally, a dynamic nomogram was developed (https://a18895635453.shinyapps.io/dynnomapp/).

Conclusion

This nomogram based on sex, PNI, HCT, and ADL demonstrated high accuracy and clinical value in predicting HRF. It is a less expensive and more accessible approach to assess the risk of developing HRF in AECOPD patients, which is more suitable for primary hospitals, especially in developing countries with high COPD-related morbidity and mortality.

Cardiopulmonary responses during unsupported upper limb exercise tests and limitations in activities of daily living in individuals with chronic obstructive pulmonary disease

INTRODUCTION

Cardiopulmonary responses during unsupported upper limb function assessment may vary in chronic obstructive pulmonary disease (COPD).

OBJECTIVE

To compare the cardiopulmonary responses during the function assessment with the Six-Minute Pegboard and Ring Test (6PBRT) and the incremental Unsupported Upper Limb Exercise (UULEX) test in COPD and to investigate the correlations with muscle strength and the limitations on activity of daily living (ADLs).

METHODS

This was a cross-sectional study. Cardiopulmonary variables were recorded during tests using a breath-by-breath analyzer. Muscle strength was assessed using a hand-held dynamometer. Self-reported ADL was evaluated using the modified Pulmonary Functional Status and Dyspnea Questionnaire (PFSDQ-M). Paired t-test, Wilcoxon signed rank test, and Spearman correlation coefficients were used.

RESULTS

Fifteen individuals with moderate-to-severe COPD participated (66 ± 9 years old, forced expiratory volume in the first second [FEV1]: 48%±14% of predicted). The UULEX induced higher oxygen consumption (0.54 ± 0.20 vs. 0.44 ± 0.09 L/min, p = .01) and dyspnea (4.0 [2.6 to 6.9] vs. 0.5 [0.9 to 5.1], p < .01) than 6PBRT. The performance in both tests was correlated with self-reported ADL limitations on PFSDQ-M (6PBRT: r = -0.69, p < .01; UULEX: r = -0.62, p = .01).

CONCLUSION

The UULEX promoted greater cardiopulmonary responses than 6PBRT, and performance in 6PBRT and UULEX was correlated with ADL limitations in individuals with COPD.

Physical status, symptoms and health-related quality of life during a severe exacerbation of COPD: Recovery and discriminative capacity for future events

OBJECTIVE

Severe acute exacerbations of chronic obstructive pulmonary disease (AECOPD) can have a negative impact on functional capacity, symptoms and health-related quality of life (HRQOL). This study aimed to i) investigate the recovery of muscle strength, functional capacity, symptoms, and HRQOL in patients after a severe AECOPD; ii) compare with matched patients with stable COPD (SCOPD); and iii) assess whether these assessments at hospital discharge could discriminate patients' risk for future events.

METHODS

This observational study assessed patients with AECOPD during hospital discharge (T1) and one month after discharge (T2). Patients with SCOPD were assessed once. Quadriceps force, handgrip strength, short physical performance battery (SPPB), 6-min walk distance (6 MWD), COPD assessment test (CAT), London chest activity of daily living (LCADL), modified medical research council, checklist individual strength-fatigue, patient health questionnaire, and physical activity (Actigraph) were measured. Exacerbation-related readmission and mortality within six months and 1-year were collected.

RESULTS

Forty-four patients with AECOPD were matched with 44 patients with SCOPD. At T2, a significant improvement was found for the SPPB total score, 6 MWD, CAT score, and LCADL score. Compared to patients with SCOPD, a worse LCADL score was found at T2 in patients with AECOPD. Patients with AECOPD that were readmitted or died had a worse SPPB classification and five-repetition sit-to-stand test at T1.

CONCLUSION

Patients after severe AECOPD improved in functional capacity and HRQOL one month after hospital discharge, but ADL performance was still worse compared to SCOPD. Patients who were readmitted or died had significantly worse scores on functional tests at hospital discharge.

Limitations in Activities of Daily Living among Older Adults with COPD, Asthma, or Asthma-COPD Overlap Residing in Spain

Activities of daily living (ADL) may be limited by the presence of chronic diseases, and limitations in ADL contribute to an increased risk of falling. In people with asthma, chronic obstructive pulmonary disease (COPD), and asthma-COPD overlap (ACO), ADL may be affected owing to poor asthma control and COPD ventilatory limitations. The aim of this study was to establish the differing prevalence of limitations in ADL among older Spanish adults with chronic respiratory diseases (COPD, asthma, and ACO). Data from the Spanish National Health Survey were analyzed. The sample was composed of 944 older adults aged ≥65 years and with a positive diagnosis of COPD (n = 502), asthma (n = 241), or ACO (n = 201). Five basic activities of daily living (BADL) and seven instrumental activities of daily living (IADL) were studied. Frequency and percentages were used to describe sample characteristics and limitations of ADL. Significant differences were analyzed using chi-square tests. Results revealed a significant higher number of older adults with COPD (34.8%) and asthma (32.5%) without limitations in doing hard housework in comparison to ACO (17.8%). Regarding meal preparation, a higher percentage of asthmatics without difficulties (77.7%) and a lower percentage with many difficulties (2.6%) were observed in comparison to ACO (64.8%-10.2%). No differences were found in BADL, with approximately 80-90% without limitations. It seems that limitations in IADL vary according to the type of chronic pulmonary diseases, but further research is needed to clarify why differences were found only for preparing meals and hard housework. These findings should be considered in the design of interventions to promote ADL in older adults with respiratory disease.

Role of Environment on Physical Activity Patterns of Older Adults Living With HIV in New York City

ABSTRACT

The purpose of this study was to survey the physical activity (PA) patterns of older adults with HIV and investigate the relationship between environmental factors and PA in this population. This study was a secondary data analysis from 100 adults, ages 50 years and older, living with HIV in New York City. Descriptive statistics assessed PA patterns. Linear regression assessed the association between environmental factors and time spent in PA. All participants had been living with HIV for 21 years on average, were on antiretroviral therapy, ranged in age from 50 to 71 years, and were 50% female. Participants performed at 75% of their functional capacity ( p < .0001), and females walked less than males ( p < .05). Traffic hazards were the sole environmental predictor of PA participation. Targeted interventions are needed to increase PA in this growing population. Interventions at the policy level should reduce traffic hazards to support PA.

Evaluation of primary and accessory respiratory muscles and their influence on exercise capacity and dyspnea in pulmonary arterial hypertension

BACKGROUND

Skeletal and respiratory muscle disfunction has been described in pulmonary arterial hypertension (PAH), however, involvement of accessory respiratory muscles and their association with symptomatology in PAH is unclear.

OBJECTIVES

To assess the primary and accessory respiratory muscles and their influence on exercise tolerance and dyspnea.

METHODS

27 patients and 27 healthy controls were included. Serratus anterior (SA), pectoralis muscles (PM) and sternocleidomastoid (SCM) muscle strength were evaluated as accessory respiratory muscles, maximal inspiratory (MIP) and expiratory pressures (MEP) as primary respiratory muscles, and quadriceps as peripheral muscle. Exercise capacity was evaluated with 6-min walk test (6MWT), dyspnea with modified Medical Council Research (MMRC) and London Chest Activity of Daily Living (LCADL) scales.

RESULTS

All evaluated muscles, except SCM, and 6MWT were decreased in patient group (p < 0.01). SA was the most affected muscle among primary and accessory respiratory muscles (Cohen's-d = 1.35). All evaluated muscles significantly correlated to 6MWT (r = 0.428-0.525). A multivariate model including SA, SCM and MIP was the best model for predicting 6MWT (R = 0.606; R² = 0.368; p = 0.013) and SA strength had the most impact on the 6MWT (B = 1.242; β = 0.340). None of the models including respiratory muscles were able to predict dyspnea, however PM and SA strength correlated to LCADL _total (r = -0.493) and MMRC (r = -0.523), respectively.

CONCLUSION

SCM may be excessively used in PAH since it retains its strength. Considering the relationship of accessory respiratory muscles with exercise tolerance and dyspnea, monitoring the strength of these muscles in the clinical practice may help providing better management for PAH.

Analysis of the Preventive Action of Rivaroxaban against Lower Extremity Deep Venous Thrombosis in Patients after Laparoscopic Radical Gastrectomy

Background

Gastric carcinoma (GC) is a common lethal cancer in the world. Patients are prone to develop lower extremity deep venous thrombosis (LEDVT) after laparoscopic radical gastrectomy (LRG), which threatens their life and health.

Purpose

This research is to clarify the preventive action of rivaroxaban (Riv) against LEDVT in patients undergoing LRG.

Methods

A retrospective study was conducted on 70 patients with GC admitted for LRG between January 2019 and January 2022, including 40 patients (observation group) receiving Riv treatment and 30 patients (conventional group) treated with air wave pressure therapy apparatus. Quality of life, coagulation function, LEDVT formation, and complications were compared between groups.

Results

The observation group had better recovery of life quality than the control group, along with more effective inhibition of coagulation disorders, less DVT formation, and fewer complications.

Conclusions

Compared with air wave pressure therapy apparatus, Riv has better preventive action against LEDVT in GC patients after LRG.

The Impact of Charlson Comorbidity Index on the Functional Capacity of COVID-19 Survivors: A Prospective Cohort Study with One-Year Follow-Up

Objective: To determine the association between the Charlson comorbidity index (CCI) score after discharge with 6-min walk test (6MWT) 1 year after discharge in a cohort of COVID-19 survivors. Methods: In this prospective study, data were collected from a consecutive sample of patients hospitalized for COVID-19. The CCI score was calculated from the comorbidity data. The main outcome was the distance walked in the 6MWT at 1 year after discharge. Associations between CCI and meters covered in the 6MWT were assessed through crude and adjusted linear regressions. The model was adjusted for possible confounding factors (sex, days of hospitalization, and basal physical capacity through sit-to-stand test one month after discharge). Results: A total of 41 patients were included (mean age 58.8 ± 12.7 years, 20/21 men/women). A significant association was observed between CCI and 6MWT (meters): (i) crude model: β = −18.7, 95% CI = −34.7 to −2.6, p < 0.05; (ii) model adjusted for propensity score including sex, days of hospitalization, and sit-to-stand: β = −23.0, 95% CI = −39.1 to −6.8, p < 0.05. Conclusions: A higher CCI score after discharge indicates worse performance on the 6MWT at 1-year follow-up in COVID-19 survivors. The CCI score could also be used as a screening tool to make important clinical decisions.

Symptom burden and functional performance in patients with chronic obstructive pulmonary disease

BACKGROUND

The burden of COPD is growing, and it is one of the leading disease burdens worldwide. Studies on symptom burden as a multidimensional concept in COPD and functional performance are lacking, and little is known about the effect of multiple symptoms and symptom burden on functional performance.

METHODS

A descriptive, cross-sectional correlational survey design was used. The Memorial Symptom Assessment Scale (MSAS) and the Functional Performance Inventory-Short Form (FPI-SF) were used to measure the symptom burden and functional performance. Data were analyzed using descriptive and inferential statistics. Participants (n = 214) were recruited from the respiratory outpatient clinic in one of the teaching hospitals in Ireland.

RESULTS

Patients with COPD, regardless of classification, experienced significant physical and psychological symptom burden. A total of 20 symptoms were negatively correlated with overall functional performance, indicating a high symptom burden for those symptoms was associated with low overall functional performance. A statistically significant negative correlation between physical symptom burden, psychological symptom burden, total symptom burden, and functional performance was found.

CONCLUSION

Patients with COPD experience a significant symptom burden and low functional performance. Decreased functional performance was not related only to a single burdensome symptom, but may also be related to the contribution of several physical/psychological burdensome symptoms, or both. Assessment and management of these symptoms are essential and imply that alleviating these symptoms' burden may promote improved functional performance. This study supported the growing body of evidence of the need for patients with advanced COPD to receive palliative care.

Factors related to instrumental activities of daily living in persons with chronic thromboembolic pulmonary hypertension

Instrumental activities of daily living (IADL) are significantly related to quality of life and mortality among individuals with heart disease. However, few reports have examined IADL in persons with chronic thromboembolic pulmonary hypertension (CTEPH). The aim of this study was to clarify factors related to IADL in persons with CTEPH. This retrospective, observational study enrolled 163 persons with CTEPH (mean ± standard deviation age = 65 ± 13 years; 68% female) admitted to the Department of Cardiology at Keio University Hospital between January 2015 and July 2019. The Frenchay Activities Index (FAI) was used to assess IADL. Age, sex, body mass index, World Health Organization functional class (WHO-FC), cardiac function (mean pulmonary arterial pressure, mean right atrial pressure, pulmonary capillary wedge pressure, and cardiac index), pulmonary function (percentage vital capacity, percentage forced expiratory volume in 1 s, diffusion capacity of carbon monoxide (DLCO)/alveolar volume (VA)), physical function (knee extension strength and walking speed), and 6-min walking distance (6MWD) were assessed. Multiple regression analysis was performed to identify factors significantly associated with FAI. Mean FAI was 25 ± 8. Univariate analysis showed that sex, WHO-FC, DLCO/VA, walking speed, and 6MWD were correlated with FAI. Multiple regression analysis showed that 6MWD (sβ = 0.338, 95% CI 0.014–0.034, p < .001), sex (sβ = 0.268, 95% CI 2.238–7.165, p < .001), and DLCO/VA (sβ = 0.257, 95% CI 1.011–3.528, p < .001) were significantly correlated with FAI (R² = 0.261). IADL were associated with exercise tolerance, sex, and DLCO/VA in persons with CTEPH. In the future, more details of IADL are expected to be clarified by analyzing individual components of IADL and investigating social background characteristics, including living environment.

Daily Activities: The Impact of COPD and Cognitive Dysfunction

OBJECTIVE

Chronic obstructive pulmonary disease (COPD) is characterized by airflow limitation; however, pulmonary function does not fully account for patients' functional difficulties. The primary aim of the study was to determine the association between several domains of cognition and daily activity among those with COPD.

METHOD

Eighty-nine former smokers completed a neuropsychological battery including measures across multiple domains of cognition, pulmonary function measures, and daily activity questionnaires. Using a cross-sectional design, we compared daily activity between former smokers with and without COPD using two measures (St. George's Respiratory Questionnaire [SGRQ] Activity Subscale and Lawton Instrumental Activities of Daily Living [IADL] Scale) and examined the association between cognition and daily activity among those with COPD.

RESULTS

As expected, former smokers with COPD reported more difficulty than those without COPD on both activity measures (SGRQ Activity Subscale p < .001; Lawton IADL Scale p = .040). Among former smokers with COPD, poorer delayed recall was associated with more difficulty with daily activities (SGRQ Activity Subscale) (p = .038) while adjusting for severity of airflow limitation, exercise tolerance, oxygen use, dyspnea, and symptoms of anxiety and depression.

CONCLUSION

The findings suggest that cognition is associated with daily activity in patients with COPD. Future research should examine whether cognitive interventions may help to maximize patients' engagement in daily activities.

The Investigation of Falls and Balance from the Perspective of Activities of Daily Living in Patients with COPD

The aim of this study was (1) to compare the activities of daily living (ADLs), perceived falling risk and balance in chronic obstructive pulmonary disease (COPD) patients with or without falling history and (2) to investigate the relationship between ADLs and balance. Fourteen patients with COPD with a history of falling whose mean falling frequency was 2.64 ± 0.74 times in the last 12-months (fallers) and 14 age and sex-matched patients with COPD with no history of falling (non-fallers) were included. The outcome measures were the London Chest Activity of Daily Living (LCADL) scale, Activities-Specific Balance Confidence (ABC) scale, Berg Balance Scale (BBS), 6-minute walking test, and quadriceps-femoris strength. Fallers reported increased dyspnoea perception in ADLs, decreased balance confidence, and disturbed balance compared with non-fallers (p < 0.05). A strong correlation was found between the LCADL scale item score (dressing the upper body) and the BBS total score (rho = -0.81, p = 0.001) in fallers. The LCADL scale item score (going out socially) was significantly correlated with the total score of the ABC scale (rho = -0.61, p = 0.001). Moderate correlations were found between the LCADL scale item scores (dressing the upper body, washing hair, and walking up stairs) and the BBS total score (p < 0.003). This study demonstrated that increased severity of dyspnoea perception during ADLs is associated with impaired balance and poor balance confidence, regardless of functional capacity and peripheral muscle strength in patients with COPD. The balance confidence was low in functional mobility-based activities in patients with COPD with a history of falling.

Limb muscle size and contractile function in adults with cystic fibrosis: A systematic review and meta-analysis

BACKGROUND

There is conflicting evidence regarding the presence of limb muscle impairments in adults with cystic fibrosis (CF), and the factors associated with these muscle impairments. The objectives of this study were to compare limb muscle size and function between adults with CF and healthy controls; and to examine their associations with demographic and clinical variables in adults with CF.

METHODS

The systematic review was performed using PRISMA guidelines. Studies were included if they measured any aspect of limb muscle size or function in adults with CF. Meta-analyses were performed to compare muscle variables between CF and healthy controls; and to examine their associations with demographic and clinical variables.

RESULTS

Twenty-eight studies were included, with 747 adults with CF. The meta-analyses showed that adults with CF have smaller thigh muscles [standardized mean difference (SMD) = 0.57, p<.0011, I²=0%], and lower handgrip strength (SMD = 0.89, p=.0034, I²=74.03%), which was weakly correlated with forced expiratory volume in one second (FEV₁) (r=0.24, p=.035, I²=0%) and lower in females with CF (SMD = 2.05, p<.0001, I²=0%). There is no significant difference between adults with CF and controls in knee extensor strength (SMD = 0.25, p=.095, I²=42.79%).

CONCLUSIONS

Leg muscle atrophy and lower handgrip strength were noted. There may be a subgroup of adults with CF with knee extensor (quadriceps) weakness. Future studies are needed to better understand muscle impairments in people with CF; to explore the factors that can predict these muscle impairments; and to investigate their clinical significance in people with CF.

Juggling the management of everyday life activities in persons living with chronic obstructive pulmonary disease

PURPOSE

Evidence regarding everyday life activities in people living with COPD is limited. Such evidence can improve our understanding when designing interventions for pulmonary rehabilitation that aim at increasing or maintaining participation in these activities. The aim of this study was to describe how people living with COPD experience and manage everyday life activities.

MATERIALS AND METHODS

The sample comprised four males and four females with an age ranging from 65-87 years. Participants were interviewed in their own homes regarding experiences of performing and managing everyday life activities. Data were transcribed verbatim and analysed using content analysis.

RESULTS

Findings from this study comprised the theme "Juggling to manage everyday life activities with COPD" and three categories representing the elements of this theme: (1) consequences of COPD symptoms, (2) adjustment of activities, and (3) contextual aspects.

CONCLUSION

This study found the participants with COPD juggling the management of everyday life activities. The juggle generated a manageable daily life, which came at the expense of making deliberate choices and prioritizing everyday life activities that were necessary for participation in valued and engaging activities in order to maintain health and well-being.Implications for RehabilitationPeople living with COPD experience a complex juggling between the consequences of COPD symptoms and contextual aspects when managing everyday life activities.The participants had largely accepted their disease and adjusted to their situation.The disease was still described as frustrating and generated less focus on making deliberate choices and prioritizing everyday life activities that are necessary for participation in valued and engaging activities.Health professionals need to support people living with COPD in making deliberate choices in order to continue participating in valued and engaging everyday life activities as they affect health and well-being.Pulmonary rehabilitation should focus more on supporting participation in social relations and on using everyday technologies.

New Insights into Activities of Daily Living Performance in Chronic Obstructive Pulmonary Disease

Purpose

There have been calls for more knowledge of activities of daily living (ADL) performance in order to address interventions in pulmonary rehabilitation effectively. Everyday technology (ET) has become an integrated dimension of ADL, impacting the ways in which ADL is performed. To improve everyday functioning and quality of life, the use of ADL and ET use needs to be evaluated and addressed effectively in interventions. Therefore, the aim of this study was twofold: 1) to explore the quality of ADL performance, and 2) to investigate the relationship between observation and self-reported ADL performance and ability to use everyday technologies in people living with COPD.

Methods

This cross-sectional study involved 84 participants aged 46–87 years. Participants were recruited through healthcare centres in the Northern Region of Denmark using a convenience sampling procedure. Data were collected using standardized assessments that investigated different ADL perspectives: self-reported ADL tasks and ET use, observed motor and process ability, and need for assistance. Data were analysed and presented using descriptive statistics and Pearson’s correlation coefficient.

Results

The most affected ADL tasks were mobility within or outside the home, lower dressing, bathing, pedicuring, cooking, shopping, cleaning and washing clothes. New insights into the quality of ADL performance in people living with COPD were presented in terms of detailed ADL motor skills and ADL process skills, as well as the predicted need for support to function in the community. Moreover, new insights into the relationship between observation and self-reported ADL performance (r=0.546, p<0.01; r=0.297, p<0.01) and between ADL performance and self-perceived ability to use ET (r=0.524, p<0.01; r=0.273, p<0.05; r=0.044, p=0.692) were presented.

Conclusion

Overall, the knowledge from the present study is valuable for focusing interventions that address challenging ADL performance and ET use through relevant and realistic activities. The ability to use ET is important to evaluate and target pulmonary rehabilitation.

Impact of exercise training and supplemental oxygen on submaximal exercise performance in patients with COPD

Functional impairment caused by chronic obstructive pulmonary disease (COPD) impacts on activities of daily living and quality of life. Indeed, patients' submaximal exercise capacity is of crucial importance. It was the aim of this study to investigate the effects of an exercise training intervention with and without supplemental oxygen on submaximal exercise performance. This is a secondary analysis of a randomized, controlled, double-blind, crossover trial. 29 COPD patients (63.5 ± 5.9 years; FEV₁ 46.4 ± 8.6%) completed two consecutive 6-week periods of high-intensity interval cycling and strength training, which was performed three times/week with either supplemental oxygen or medical air (10 L/min). Submaximal exercise capacity as well as the cardiocirculatory, ventilatory, and metabolic response were evaluated at isotime (point of termination in the shortest cardiopulmonary exercise test), at physical work capacity at 110 bpm of heart rate (PWC 110), at the anaerobic threshold (AT), and at the lactate-2 mmol/L threshold. After 12 weeks of exercise training, patients improved in exercise tolerance, shown by decreased cardiocirculatory (heart rate, blood pressure) and metabolic (respiratory exchange ratio, lactate) effort at isotime; ventilatory response was not affected. Submaximal exercise capacity was improved at PWC 110, AT and the lactate-2 mmol/L threshold, respectively. Although supplemental oxygen seems to affect patients' work rate at AT and the lactate-2 mmol/L threshold, no other significant effects were found. The improved submaximal exercise capacity and tolerance might counteract patients' functional impairment. Although cardiovascular and metabolic training adaptations were shown, ventilatory efficiency remained essentially unchanged. The impact of supplemental oxygen seems less important on submaximal training effects.

Cardiorespiratory Response during the 1-min Sit-to-Stand Test in Chronic Obstructive Pulmonary Disease

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 V˙O2, V˙E, 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 V˙O2 overshoot during recovery was observed only in people with COPD. 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 V˙O2 overshoot and slower recovery time of cardiorespiratory variables seen in COPD demonstrate the clinical relevance of monitoring the recovery phase of exercise.