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Introduction. The incremental shuttle walking test (ISWT) has been widely used in different health conditions. Because of the learning effect, the test should be performed at least twice. However, there is no formal recommendation or consensus on the rest interval that should be used between the tests. Therefore, the aim of this study was to systematically review the most common rest intervals applied for ISWT in adult and elderly individuals with different health conditions. Methods. We performed a systematic review based on the PRISMA protocol, registered in PROSPERO. Searches were conducted in 8 electronic databases (MEDLINE via PubMed and OvidSP, PEDro, LILACS, SciELO, Cochrane, CINAHL, Web of Science, and Scopus) by using specific terms. Results. We initially found 1538 references, of which 75 met the inclusion criteria. Numerous studies did not report the rest interval between the tests and therefore could not be included in the review. Of the 75 studies, 41 evaluated individuals with respiratory dysfunctions, mainly chronic obstructive pulmonary disease. Most of them (n = 57) used a 30-minute interval, followed by a 20-minute interval (n = 6) and a 15-minute interval (n = 4). Conclusions. This systematic review demonstrates that many studies did not point out the rest interval for ISWT. Although there was a predominance of a 30-minute interval between the tests, future research is needed to understand the implications of the resting interval on ISWT outcomes. [ABSTRACT FROM AUTHOR]

Background: Optoelectronic plethysmography (OEP) is an innovative method of indirect measurement of pulmonary ventilation, capable of breath-by-breath, three-dimensional, real time assessment of absolute lung volumes and their variations in the three compartments of the chest wall (pulmonary rib cage, abdominal rib cage, and abdomen). OEP allows the measurement of variables of breathing pattern, breathing asynchrony, and contribution of each chest wall compartment and hemithorax to the tidal volume. Objectives: To review the literature on the following aspects related to OEP: history, operating principle, advantages, psychometric properties, variables, and method of system analysis, highlighting information about its handling. In a second part, the objective is to analyze the applicability of OEP in different health conditions/situations such as: chronic obstructive pulmonary disease (COPD; acute effects of exercise, pulmonary rehabilitation, breathing exercise, and lung transplantation), asthma, patients in intensive care, neuromuscular diseases, and stroke. Method: A search was performed in MedLine, SciELO and Lilacs with the term 'optoelectronic plethysmography'. Forty-three papers were included. Conclusion: Based on the literature reviewed, OEP has been shown to be an assessment tool that can provide information about ventilatory parameters in healthy subjects and subjects with various dysfunctions in different positions, situations, and settings. The main results of studies on OEP in COPD are shown, representing the largest body of knowledge to date. The results of studies on OEP in other health conditions are also shown. [ABSTRACT FROM AUTHOR]

Background: The relationship between rib cage (RC) motion abnormalities, dynamic hyperinflation (DH), and exercise capacity in people with COPD is controversial., Aim: To investigate RC distortion and operational chest wall volumes during moderate and high constant-rate exercises in people with COPD., Methods: Seven male participants [median(Q1-Q3) age: 63(60.0-66.0) years; FEV 1 : 39.0(38.0-63.0)% of predicted] performed a symptom-limited incremental exercise testing on cycle ergometer, followed by constant-rate tests (60 % and 80 % of peak work rate). Optoelectronic plethysmography was used to evaluate RC distortion: phase angle-PhAng, inspiratory phase ratio-PhRIB, expiratory phase ratio-PhREB; and chest wall volumes: end-inspiratory volume-Vei and end-expiratory volume-Vee., Results: PhRIB and PhREB significantly increased during both constant-rate exercise tests, without difference between them. In general, Vei of the chest wall significantly increased in both exercise intensities while Vee did not change., Conclusions: The occurrence of RC distortion seemed not to limit the exercise capacity in people with COPD evaluated, and it was present even in the absence of DH., (Copyright © 2021 Elsevier B.V. All rights reserved.)

Aim: The aim of this study was to evaluate the effects of interval high intensity inspiratory muscle training (IMT) on resting breathing pattern in patients with advanced lung disease., Methods: IMT was performed daily and training load set at 50 % of the maximal inspiratory pressure. Participants were evaluated at pre-IMT, post 8 weeks of IMT and follow-up (3 months after the end of IMT). Breathing pattern (volume and time variables as well as percentages of contribution to tidal volume) was evaluated by Optoelectronic Plethysmography at rest. Friedman test was used to verify the differences between the three time-points (p < 0.05)., Results: Nineteen patients (54 ± 16 years old; 5 males) were evaluated at pre-IMT and post-IMT and fourteen were assessed at follow-up. There was no significant difference (p > 0.05) in any comparison for all evaluated breathing pattern variables at the three time-points., Conclusion: Resting breathing pattern was not significantly changed after 8 weeks of IMT in patients with advanced lung disease., (Copyright © 2020 Elsevier B.V. All rights reserved.)

Purpose: To compare the effects of flow incentive spirometer (FIS), volume incentive spirometer (VIS), and sustained maximal inspiration exercise (SMI) on breathing pattern, chest wall motion, and thoracoabdominal asynchrony., Methods: Sixteen healthy adults aged 27.63 ± 5.26 years were evaluated by optoelectronic plethysmography in the supine position with trunk inclination of 45° during quiet breathing and during exercise performance., Results: In the comparisons among exercises, VIS promoted a significantly higher inspiratory time and lower mean inspiratory flow compared with FIS. The rating of perceived exertion according to the Borg Scale was significantly higher after the performance of FIS compared with VIS. Regarding asynchrony, none of the exercises caused changes in thoracoabdominal synchrony between the rib cage and abdomen. However, both devices significantly reduced the asynchrony between the pulmonary and abdominal rib cage compared with quiet breathing., Conclusion: SMI exercise was equivalent to incentive spirometers and may be an interesting alternative for clinical use in cases in which it is not possible to acquire the devices., (Copyright © 2019 Elsevier B.V. All rights reserved.)

Optoelectronic plethysmography (OEP) has been used to measure changes in chest wall volume and its compartments. However, literature lacks research on its reliability. The purpose of this study was to evaluate the intra-rater and inter-rater reliability of OEP. Thirty-two healthy subjects were evaluated at rest and during submaximal exercise on a cycle ergometer. The following variables were assessed: chest wall volume (VCW); percentage contribution of the pulmonary rib cage (V(rcp)%), abdominal rib cage (V(rca)%), rib cage (V(rc)%) and abdomen (Vab%); chest wall end-expiratory volume (Vee(cw)); chest wall end-inspiratory volume (Vei(cw)); ratio of inspiratory time to total time of the respiratory cycle (Ti/T(tot)); respiratory rate (f) and mean inspiratory flow (V(cw)/Ti). Intraclass correlation coefficient (ICC) and coefficient of variation of Method Error (CV(ME)) were used to evaluate reliability. Results showed ICC values higher than 0.75 and CV(ME) values less than 10% for most variables at rest and during exercise indicating that OEP is a reliable instrument to assess chest wall volumes at rest and during exercise in healthy subjects., (Copyright © 2013 Elsevier B.V. All rights reserved.)

Background: Optoelectronic plethysmography (OEP) is an innovative method of indirect measurement of pulmonary ventilation, capable of breath-by-breath, three-dimensional, real time assessment of absolute lung volumes and their variations in the three compartments of the chest wall (pulmonary rib cage, abdominal rib cage, and abdomen). OEP allows the measurement of variables of breathing pattern, breathing asynchrony, and contribution of each chest wall compartment and hemithorax to the tidal volume., Objectives: To review the literature on the following aspects related to OEP: history, operating principle, advantages, psychometric properties, variables, and method of system analysis, highlighting information about its handling. In a second part, the objective is to analyze the applicability of OEP in different health conditions/situations such as: chronic obstructive pulmonary disease (COPD; acute effects of exercise, pulmonary rehabilitation, breathing exercise, and lung transplantation), asthma, patients in intensive care, neuromuscular diseases, and stroke., Method: A search was performed in MedLine, SciELO and Lilacs with the term "optoelectronic plethysmography". Forty-three papers were included., Conclusion: Based on the literature reviewed, OEP has been shown to be an assessment tool that can provide information about ventilatory parameters in healthy subjects and subjects with various dysfunctions in different positions, situations, and settings. The main results of studies on OEP in COPD are shown, representing the largest body of knowledge to date. The results of studies on OEP in other health conditions are also shown.

Objective: to describe the breathing pattern and thoracoabdominal motion of healthy individuals, taking age and sex into consideration., Methods: the study included 104 individuals aged 20 to 39, 40 to 59, and 60 to 80 years (41 males and 63 females), with normal body mass index and spirometric values. Participants were evaluated at rest in the supine position, by means of respiratory inductive plethysmography. The following variables were measured: tidal volume (Vt), respiratory frequency (f), minute ventilation (VE), inspiratory duty cycle (Ti/Ttot), mean inspiratory flow (Vt/Ti), rib cage motion (%RC), inspiratory phase relation (PhRIB), expiratory phase relation (PhREB), and phase angle (PhaseAng). Comparisons between the age groups were performed using one-way ANOVA or Kruskal-Wallis H, while comparisons between the sexes were performed using Student's t test or the Mann-Whitney U test, depending on the data distribution; p<0.05 was taken to be significant., Results: comparison between the sexes showed that, in the age groups 20 to 39 and 60 to 80 years, women presented significantly lower values for Vt, VE, and Ti/Ttot than men, and there was no significant difference in the age group 40 to 59 years. Comparisons between the age groups showed that participants aged 60 to 80 presented significantly greater PhRIB and PhaseAng than participants aged 20 to 39 years, without significant differences in the breathing pattern., Conclusion: the data suggest that breathing pattern is influenced by sex whereas thoracoabdominal motion is influenced by age.

Purpose of Review: Home-based pulmonary rehabilitation programs have been proposed as an alternative to hospital-based programs for patients with chronic obstructive pulmonary disease (COPD). We undertook a systematic review of randomized studies on home-based pulmonary rehabilitation in patients with COPD which report health-related quality of life and/or exercise capacity, in order to assess the benefits of this intervention., Main Findings: From 888 identified references, 12 met the inclusion criteria. Overall, the methodological quality of the studies was average to poor. Eight studies compared home-based rehabilitation to standard care, three compared home-based rehabilitation to hospital-based programs and one included both comparisons. Most of the studies showed improvement in health-related quality of life (statistically and clinically significant) and exercise capacity following home-based rehabilitation as compared with standard care (no pulmonary rehabilitation). Studies that compared home-based pulmonary rehabilitation with hospital-based outpatient programs have not been able to show statistically and clinically significant differences for health-related quality of life and exercise capacity. Adverse events, usually mild, were reported in only two studies., Summary: Self-monitored, home-based rehabilitation may be an alternative to outpatient rehabilitation. These findings can help expand the recognition, application and accessibility of pulmonary rehabilitation for patients with COPD.

Objective: To assess the effect of prone and supine positions on breathing pattern variables, thoracoabdominal motion and peripheral oxygen saturation of hemoglobin of premature newborn infants recovering from respiratory distress syndrome, while breathing spontaneously and in rapid eye movement sleep., Methods: This was a quasi-experimental study. Twelve preterms weighing > 1,000 g at enrollment were studied in both positions, in random order. Respiratory inductive plethysmography was used to analyze breathing pattern (tidal volume, respiratory rate, minute ventilation, mean inspiratory flow) and thoracoabdominal motion (labored breathing index, phase relation in inspiration, phase relation in expiration, phase relation in total breath and phase angle). Pulse oximetry was used to evaluate peripheral oxygen saturation. Student's t test for paired samples or the Wilcoxon test were used for statistical analysis. Significance was set at p < 0.05., Results: A total of 9,167 respiratory cycles were analyzed. The prone position was associated with significant reductions in labored breathing index (-0.84+/-0.69; p = 0.001; 95%CI -1.29 to -0.40), phase relation in inspiration (-27.36+/-17.55; p = 0.000; 95%CI -38.51 to -16.20), phase relation in expiration (-32.36+/-16.20; p = 0.000; 95%CI -42.65 to -22.06) and phase relation in total breath (-30.20+/-14.76; p = 0.000; 95%CI -39.59 to -20.82). There were no significant differences between the two positions in any of the other variables analyzed., Conclusion: The prone position resulted in a significant reduction in thoracoabdominal asynchrony, without affecting breathing pattern or peripheral oxygen saturation.