Inspiratory Muscle Endurance Research Articles

Perioperative interventions to enhance surgical outcomes for older adults with cancer: A systematic review.

219 Background: Older adults with cancer have unique needs, particularly in the perioperative setting, which likely influence surgical outcomes in the geriatric oncology population. Little work has sought to describe available literature investigating perioperative interventions to enhance surgical outcomes for these individuals. Our systematic review sought to describe the literature on perioperative interventions in older adults with cancer undergoing surgery. Methods: Following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines, we performed a comprehensive search using the Ovid MEDLINE, CINAHL, and Embase databases, searching for literature published from 1/2010-10/2023 (search terms used relevant terminology for geriatric oncology in the perioperative setting). We included randomized controlled trials (RCT) focusing on patient-centered interventions that enrolled adults >60 years old with cancer, excluding studies with pharmacologic, procedural, and radiographic interventions. Results: We included 11 RCTs with 2,177 patients. Patients’ age ranged from 60-95, and median number of patients per study was 147 (range: 44-690). Most studies included patients with colorectal cancer (81.8% [9/11]), all involving non-emergent elective surgeries. Half the studies (54.5% [6/11]) evaluated exercise interventions, and the remaining assessed geriatric assessment-guided interventions (27.2% [3/11]), nutrition optimization (9.1% [1/11]), and patient empowerment (9.1% [1/11]). Primary outcomes were as follows: postoperative complications, quality of life, feasibility of exercise programs, delirium incidence, inspiratory muscle endurance, hospital length of stay, and consistency of nutritional management. All studies had postoperative complications as a primary or secondary outcome. In studies with exercise-based interventions, all but one (83.3% [5/6]) found reduction in postoperative complications, and one showed improvement in quality of life (16.7% [1/6]). Studies focusing on geriatric assessment did not achieve significant differences in outcomes. We found implementation challenges that influenced several studies, including high drop-out rates and intervention fidelity. Conclusions: In this review, we found 11 studies focused on perioperative interventions in older adults with cancer undergoing surgery. Notably, interventions involved exercise, geriatric assessment-guided care, nutrition optimization, and patient empowerment. RCTs to date seem to primarily focus on exercise interventions and geriatric assessment-guided strategies. Although most studies met their primary endpoint, we found heterogeneity in intervention modality and outcome assessment, thus demonstrating a need for ongoing work to address the unique needs of the geriatric oncology population.

Impacts of three inspiratory muscle training programs on inspiratory muscles strength and endurance among intubated and mechanically ventilated patients with difficult weaning: a multicentre randomised controlled trial

BackgroundInspiratory muscle training (IMT) is well-established as a safe option for combating inspiratory muscles weakness in the intensive care setting. It could improve inspiratory muscle strength and decrease weaning duration but a lack of knowledge on the optimal training regimen raise to inconsistent results. We made the hypothesis that an innovative mixed intensity program for both endurance and strength improvement could be more effective. We conducted a multicentre randomised controlled parallel trial comparing the impacts of three IMT protocols (low, high, and mixed intensity) on inspiratory muscle strength and endurance among difficult-to-wean patients.MethodsNinety-two patients were randomly assigned to three groups with different training programs, where each performed an IMT program twice daily, 7 days per week, from inclusion until successful extubation or 30 days. The primary outcome was maximal inspiratory pressure (MIP) increase. Secondary outcomes included peak pressure (Ppk) increase as an endurance marker, mechanical ventilation (MV) duration, ICU length of stay, weaning success defined by a 2-day ventilator-free after extubation, reintubation rate and safety.ResultsMIP increases were 10.8 ± 11.9 cmH2O, 4.5 ± 14.8 cmH2O, and 6.7 ± 14.5 cmH2O for the mixed intensity (MI), low intensity (LI), and high intensity (HI) groups, respectively. There was a non-statistically difference between the MI and LI groups (mean adjusted difference: 6.59, 97.5% CI [− 14.36; 1.18], p = 0.056); there was no difference between the MI and HI groups (mean adjusted difference: − 3.52, 97.5% CI [− 11.57; 4.53], p = 0.321). No significant differences in Ppk increase were observed among the three groups. Weaning success rate observed in MI, HI and LI group were 83.7% [95% CI 69.3; 93.2], 82.6% [95% CI 61.2; 95.0] and 73.9% [95% CI 51.6; 89.8], respectively. MV duration, ICU length of stay and reintubation rate had similar values. Over 629 IMT sessions, six adverse events including four spontaneously reversible bradycardia in LI group were possibly related to the study.ConclusionsAmong difficult-to-wean patients receiving invasive MV, no statistically difference was observed in strength and endurance progression across three different IMT programs. IMT appears to be feasible in usual cares, but some serious adverse events such as bradycardia could motivate further research on the specific impact on cardiac system.Trial registration Clinicaltrials.gov identifier: NCT02855619. Registered 28 September 2014

Inspiratory muscle endurance is similarly reduced in the early and late stages of chronic Chagas heart disease.

Inspiratory muscle strength (IMS) appears to be reduced in subjects with chronic Chagas heart disease (CHD), especially in the presence of heart failure (HF). However, only one study about IMS and inspiratory muscle endurance (IME) in those with CHD without heart failure is available. This study aimed to compare IMS and IME in subjects with CHD in the presence and absence of HF. This is a cross-sectional study in which 30 CHD adult patients were divided into CHD-CC group (initial phase of CHD, without HF; n = 15) and CHD-HF group (advanced phase of CHD, with HF; n = 15). We assessed IMS by maximum inspiratory pressure (MIP) and IME by incremental (Pthmax) and constant load (TLim) tests. Reduced IMS and IME were considered by predicted MIP values <70% and Pthmax/MIP <75%, respectively. Inspiratory muscle weakness (IMW) was more frequent in CHD-HF than in CHD-CC (46.7% vs. 13.3%; p = 0.05), and both groups had high frequencies of reduced IME (93.3% CHD-CC vs. 100.0% CHD-HF; p = 0.95). Age-adjusted logistic regression analysis using HF as a dependent variable showed that HF was associated with an increased chance of IMW compared with the CHD-CC group (OR = 7.47; p = 0.03; 95% CI 1.20-46.19). This study suggests that, in patients with CHD, HF is associated with IMW, and that reduction of IME is already present in the initial phase, similar to the advanced phase with HF.

The Therapeutic Role of Inspiratory Muscle Training in The Management of Asthma: A Narrative Review.

Asthma is a disorder of the airways characterized by chronic airway inflammation, hyperresponsiveness, and variable recurring airway obstruction. Treatment options for asthma include pharmacological strategies, while non-pharmacological strategies are limited. Established pharmacological approaches to treating asthma may cause unwanted side effects and do not always afford adequate protection against asthma, possibly due to an individual's variable response to medications. A potential non-pharmacological intervention that is most available and cost-effective is inspiratory muscle training (IMT), which is a technique targeted at increasing the strength and endurance of the diaphragm and accessory muscles of inspiration. Studies examining the impact of IMT on asthma have reported increases in inspiratory muscle strength, and a reduction in the perception of dyspnea and medication use. However, due to the limited number and discordant methods between studies more evidence is required to elucidate in asthmatics the efficacy of IMT on inspiratory muscle endurance, exercise capacity, asthma control, symptoms, quality of life, as well as adolescents with differing severities of asthma. Large randomized controlled trials would be a significant step forward in clarifying the effectiveness of IMT in asthmatics. While IMT may have favorable effects on inspiratory muscle strength, dyspnea and medication use, the current evidence that IMT is an effective treatment for asthma is inconclusive.

A case of herpes zoster-related phrenic nerve palsy: Effect of home-based pulmonary rehabilitation

Here, we report the case of a 62-year-old man with herpes zoster-related phrenic nerve palsy, which was evident in clinical, radiological, and electrodiagnostic studies. To aid clinical recovery and preserve pulmonary function, we designed a home-based pulmonary rehabilitation program consisting of air-stacking exercises using ambu-bagging, respiratory muscle training to improve the strength and endurance of inspiratory and expiratory muscles, and aerobic and resistance exercises of the upper and lower limbs to improve and prevent the decline of cardiorespiratory fitness. The patient was monitored, and the exercises were adjusted through regular outpatient follow-up. During the overall follow-up period of 26 months, pulmonary rehabilitation led to an increase in forced vital capacity from 2,020 to 3,160 mL, and improved the diaphragmatic height index from -4.46 to 0.28. Clinical symptoms also showed notable improvement, as the Borg Rating of Perceived Exertion scale score decreased from 17 to 7. We found that a home-based, self-performed pulmonary rehabilitation program could promote recovery from herpes zoster-related phrenic nerve palsy. Not only is this important for the rapid restoration of respiratory function and symptomatic relief, it can also protect patients from respiratory complications.

A Review of Effects of Inspiratory Muscle Training on Clinical and Functional Outcomes of Patients With Mechanical Ventilation

Objectives: This review aimed to explore inspiratory muscle training (IMT) use in patients with mechanical ventilation (MV). The topics were related to its effect on the duration of MV or weaning, respiratory symptoms or lung function, inspiratory muscle strength (IMS) or endurance, functional ability, and quality of life (QoL). Methods: Articles published in the last ten years were reviewed narratively to obtain data about how inspiratory muscle training (IMT) can affect breathing muscle strength in prolonged mechanically ventilated patients. Results: Eleven articles were relevant to the topic, including seven original articles and four systematic reviews. We also found one practical guide on IMT in intensive care unit (ICU) patients. Discussion: Inspiratory muscle weakness is found in most intensive care unit (ICU) patients which further causes difficulty in weaning from MV. No standard protocol exists for the use of IMT in patients who failed to wean from MV. The use of IMT was found to be safe with the incidence of side effects or unexpected events was very rare. Several studies found various effects on the success of weaning after IMT administration, such as decreased MV and weaning duration or no effect on these parameters. Studies also found various effects on IMS or endurance although most investigators found increased IMS after IMT administration. These effects vary with exercise intensity and baseline maximum inspiratory pressure (MIP). The IMT program improves lung function thereby reducing symptoms, leading to improved functional abilities and QoL.improved functional abilities and quality of life (QoL).

Minimal Clinically Important Differences in Inspiratory Muscle Function Variables after a Respiratory Muscle Training Programme in Individuals with Long-Term Post-COVID-19 Symptoms

To establish the minimal clinically important difference (MCID) for inspiratory muscle strength (MIP) and endurance (IME) in individuals with long-term post-COVID-19 symptoms, as well as to ascertain which of the variables has a greater discriminatory capacity and to compare changes between individuals classified by the MCID. Secondary analysis of randomised controlled trial of data from 42 individuals who performed an 8-week intervention of respiratory muscle training programme. A change of at least 18 cmH2O and 22.1% of that predicted for MIP and 328.5s for IME represented the MCID. All variables showed acceptable discrimination between individuals who classified as "improved" and those classified as "stable/not improved" (area under the curve ≥0.73). MIP was the variable with the best discriminative ability when expressed as a percentage of prediction (Youden index, 0.67; sensitivity, 76.9%; specificity, 89.7%). Participants classified as "improved" had significantly greater improvements in quality of life and lung function compared with the participants classified as "stable/not improved". In individuals with long-term post-COVID-19 symptoms, the inspiratory muscle function variables had an acceptable discriminative ability to assess the efficacy of a respiratory muscle training programme. MIP was the variable with the best discriminative ability, showing better overall performance when expressed as a percentage of prediction.

A temporal examination of inspiratory muscle strength and endurance in hospitalized COVID-19 patients

BackgroundThe two most common symptoms associated with COVID-19 are dyspnea and fatigue. One possible cause of such symptoms may be inspiratory muscle weakness. ObjectivesThe purpose of this study was to examine inspiratory muscle performance (IMP) from intensive care unit discharge (ICUD) to hospital discharge (HD) in patients with COVID-19 hypothesizing that IMP would be markedly depressed at both ICUD and HD. MethodsIMP was examined at ICUD and HD via the PrO2 device (PrO2 Health, Smithfield, RI) which provided the maximal inspiratory pressure (MIP), sustained MIP (SMIP), inspiratory duration (ID), and fatigue index test (FIT). Patient symptoms were assessed at ICUD, HD, and 1-month post-HD. Results30 patients (19 men, 11 women) with COVID-19 were included. The mean±SD age, BMI, and length of ICU and hospital stay was 71±11 yrs, 27.9 ± 6.3 kg/m, 9 ± 6 days, and 26±16 days, respectively. The mean±SD MIP, SMIP, ID, and FIT of the entire cohort at ICUD vs HD were 36±21 vs 40±20 cm H2O, 231±157 vs 297±182 PTU, 8.8 ± 4.2 vs 9.5 ± 4.6 s, and 9.0 ± 9.4 vs 13.1 ± 12.3, respectively, with only SMIP and FIT significantly greater at HD (p=.006 and 0.03, respectively). SMIP at HD was significantly related to resting dyspnea at HD (r=-0.40; p=.02). The SMIP and FIT of men were found to increase significantly from ICUD to HD, but no measure of IMP in the women increased significantly from ICUD to HD. At least one COVID-19-related symptom was present 1 month after HD with the most persistent symptoms being fatigue, cough, and dyspnea in 47%, 40%, and 37% of the patients, respectively. ConclusionsA significant reduction in IMP exists in patients with COVID-19 at both ICUD and HD and no measure of IMP in women was observed to increase significantly from ICUD to HD. Impaired inspiratory muscle endurance rather than strength was associated with greater dyspnea at HD.

Home-based respiratory muscle training on quality of life and exercise tolerance in long-term post-COVID-19: Randomized controlled trial.

To evaluate the effects of a home-based respiratory muscle training programme (inspiratory [IMT] or inspiratory/expiratory muscles [RMT]) supervised by telerehabilitation on quality of life and exercise tolerance in individuals with long-term post-COVID-19 symptoms. The secondary objective was to evaluate the effects of these programmes on respiratory muscle function, physical and lung function, and psychological state. 88 individuals with long-term symptoms of fatigue and dyspnoea after COVID-19 diagnosis were randomly (1:1 ratio) assigned to IMT, IMTsham, RMT or RMTsham groups for an 8-week intervention (40min/day, 6 times/week). Primary outcomes were quality of life (EuroQol-5D questionnaire) and exercise tolerance (Ruffier test). Secondary outcomes were respiratory muscle function (inspiratory/expiratory muscle strength; inspiratory muscle endurance), physical function (lower and upper limb strength [1-min Sit-to-Stand and handgrip force]), lung function (forced spirometry), and psychological status (anxiety/depression levels and post-traumatic stress disorder). All outcomes were measured pre-, intermediate- (4th week), and post-intervention. At post-intervention, there was a statistically significant and large (d>0.90) improvement in quality of life, but not in exercise tolerance, in the RMT group compared with the RMTsham group. Both of the real training groups produced a statistically significant and large increase in inspiratory muscle strength and endurance (d≥0.80) and in lower limb muscle strength (d≥0.77) compared with the 2 sham groups. Expiratory muscle strength and peak expiratory flow showed a statistically significant and large (d≥0.87) increase in the RMT group compared with the other 3 groups. Only an 8-week supervised home-based RMT programme was effective in improving quality of life, but not exercise tolerance, in individuals with long-term post-COVID-19 symptoms. In addition, IMT and RMT programmes were effective in improving respiratory muscle function and lower limb muscle strength, but had no impact on lung function and psychological status.

The Effects of Inspiratory Muscle Training (IMT) on Patients Undergoing Coronary Artery Bypass Graft (CABG) Surgery: A Systematic Review and Meta-Analysis.

To determine the effects of inspiratory muscle training (IMT) alone on inspiratory muscle strength and endurance, pulmonary function, pulmonary complications, and length of hospital stay in patients undergoing coronary artery bypass graft surgery (CABG). We conducted a literature search across databases (Ovid MEDLINE(R) and Epub Ahead of Print, In-Process & Other Non-Indexed Citations and Daily; Ovid Embase; Ovid Cochrane Central Register of Controlled Trials; Ovid Cochrane Database of Systematic Reviews; and Scopus) from inception to December 2021. The eligibility criteria were randomized controlled trials that investigated the effects of IMT versus usual care or sham IMT in patients undergoing CABG. A total of 12 randomized clinical trials with 918 patients were included in the meta-analysis. Postoperative IMT was associated with improved maximal inspiratory pressure (MIP), maximum inspiratory pressure (PImax), and six-minute walking test (6MWT) and with a decrease in length of hospital stay (LOS). For preoperative IMT, there was statistical significance between intervention and MIP, PImax, forced expiratory volume in one second (FEV1), forced vital capacity (FVC), postoperative pulmonary complications (PPCs), and LOS. Pre- and postoperative IMT resulted in improvements in MIP. Isolated IMT in patients who underwent CABG improved their inspiratory muscle strength and endurance, pulmonary function, and 6MWT and helped decrease postoperative pulmonary complications and the length of hospital stay.

Treinamento muscular inspiratório em pessoas com doença pulmonar obstrutiva crônica (DPOC): uma revisão sistemática

ABSTRACT This systematic review aimed to demonstrate the effectiveness of inspiratory muscle training (IMT) in people with chronic obstructive pulmonary disease (COPD), analyzing the effects of IMT on inspiratory muscle strength and endurance, exercise tolerance and reduction of dyspnea. A systematic search was carried out in the PubMed, Cochrane and Lilacs databases, from August 2021 to February 2023, searching for studies published from 2016. The descriptors used for the search followed the description of the MeSH/DeCS terms, namely: “Pulmonary Disease, Chronic Obstructive,” “Breathing Exercises,” “Exercise Tolerance,” “Dyspnea,” and “Muscle strength,” with the languages: English and Portuguese, using the Boolean operators “AND” and “OR.” Ten studies met the inclusion criteria, including 733 patients. In all examined studies, there was a significant increase in inspiratory muscle strength and endurance compared to the control group; of the ten studies analyzed, four showed advances in reducing dyspnea and exercise tolerance. Notably, inspiratory muscle training is effective in improving dyspnea, exercise tolerance, and in increasing inspiratory muscle strength and endurance in people with moderate to severe COPD.

Respiratory muscle training improves exercise tolerance and respiratory muscle function/structure post-stroke at short term: A systematic review and meta-analysis.

Previous reviews relating to the effects of respiratory muscle training (RMT) after stroke tend to focus on only one type of training (inspiratory or expiratory muscles) and most based the results on poor-quality studies (PEDro score ≤4). With this systematic review and meta-analysis, we aimed to determine the effects of RMT (inspiratory or expiratory muscle training, or mixed) on exercise tolerance, respiratory muscle function and pulmonary function and also the effects depending on the type of training performed at short- and medium-term in post-stroke. Databases searched were MEDLINE, PEDro, CINAHL, EMBASE and Web of Science up to the end of April 2020. The quality and risk of bias for each included study was examined by the PEDro scale (including only high-quality studies) and Cochrane Risk of Bias tool. Nine studies (463 patients) were included. The meta-analysis showed a significant increase in exercise tolerance [4 studies; n=111; standardized mean difference [SMD]=0.65 (95% confidence interval 0.27-1.04)]; inspiratory muscle strength [9 studies; n=344; SMD=0.65 (0.17-1.13)]; inspiratory muscle endurance [3 studies; n=81; SMD=1.19 (0.71-1.66)]; diaphragm thickness [3 studies; n=79; SMD=0.9 (0.43-1.37)]; and peak expiratory flow [3 studies; n=84; SMD=0.55 (0.03-1.08)] in the short-term. There were no benefits on expiratory muscle strength and pulmonary function variables (forced expiratory volume in 1s) in the short-term. The meta-analysis provided moderate-quality evidence that RMT improves exercise tolerance, diaphragm thickness and pulmonary function (i.e., peak expiratory flow) and low-quality evidence for the effects on inspiratory muscle strength and endurance in stroke survivors in the short-term. None of these effects are retained in the medium-term. Combined inspiratory and expiratory muscle training seems to promote greater respiratory changes than inspiratory muscle training alone.

Efetividade de diferentes protocolos e cargas utilizadas no treinamento muscular inspiratório de indivíduos com DPOC: uma revisão sistemática

ABSTRACT Chronic obstructive pulmonary disease (COPD) changes the musculoskeletal system, including the respiratory muscles, which are responsible for increasing dyspnea and reducing functional capacity. Several studies have already showed the effectiveness of inspiratory muscle training (IMT); therefore, it should be part of the pulmonary rehabilitation program. However, assessing the best way to do it is still necessary. Thus, this study aimed to evaluate, by a systematic review, the effectiveness of different IMT protocols and loads on the outcomes of inspiratory muscle strength and endurance, functional capacity, and dyspnea reduction. This systematic review was performed in accordance with the PRISMA protocol. Studies were searched in February 2021 in the PubMed, SciELO, PEDro. For the search, the following keywords were used: “COPD” and “breathing exercises, resistive training, respiratory muscle training.” A total of 398 individuals previously diagnosed with COPD were included in the 10 selected studies. Different IMT devices were used and protocols varied in relation to loads and progression. Threshold was the most used IMT device. Its load was established according to the percentage of maximal inspiratory pressure (MIP) (30-80%) and readjusted according to new measurements taken every one or two weeks. Respiratory muscle training with both low loads and high loads presented positive results, however, establishing which is the best IMT protocol for individuals with COPD is not possible yet. Inspiratory muscle strength, functional capacity, and dyspnea get better with IMT.

Does mechanical threshold inspiratory muscle training promote recovery and improve outcomes in patients who are ventilator-dependent in the intensive care unit? The IMPROVE randomised trial

BackgroundIn patients who are ventilator-dependent in the intensive care unit, inspiratory muscle training may improve inspiratory muscle strength and accelerate liberation from the ventilator, but optimal training parameters are yet to be established, and little is known about the impact of inspiratory muscle training on quality of life or dyspnoea. Thus, we sought to ascertain whether inspiratory muscle training, commenced while ventilator-dependent, would improve outcomes for patients invasively ventilated for 7 days or longer. MethodsIn this randomised trial with assessor blinding and intention-to-treat analysis, 70 participants (mechanically ventilated ≥7 days) were randomised to receive once-daily supervised high-intensity inspiratory muscle training with a mechanical threshold device in addition to usual care or to receive usual care (control). Primary outcomes were inspiratory muscle strength (maximum inspiratory pressure % predicted) and endurance (fatigue resistance index) at ventilator liberation and 1 week later. Secondary outcomes included quality of life (SF-36v2, EQ-5D), dyspnoea, physical function, duration of ventilation, and in-hospital mortality. ResultsThirty-three participants were randomly allocated to the training group, and 37 to the control group. There were no statistically significant differences in strength (maximum inspiratory pressure) (95% confidence interval [CI]: −7.4 to 14.0) or endurance (fatigue resistance index) (95% CI: −0.003 to 0.436). Quality of life improved significantly more in the training group than in the control group (EQ-5D: 17.2; 95% CI: 1.3–33.0) (SF-36-PCS: 6.97; 95% CI: 1.96–12.00). Only the training group demonstrated significant reductions in dyspnoea (−1.5 at rest, −1.9 during exercise). There were no between-group differences in duration of ventilation or other measures. In-hospital mortality was higher in the control group than in the training group (9 vs 4, 24% vs 12%, p = 0.23). ConclusionsIn patients who are ventilator-dependent, mechanical threshold loading inspiratory muscle training improves quality of life and dyspnoea, even in the absence of strength improvements or acceleration of ventilator liberation.

Influence of Inspiratory Muscle Training on Respiratory Functions among Uncontrolled Asthmatics

Background: Specific breathing exercises are reported to improve quality of life and reduce symptoms; although no significant benefit on lung function or reduction of exacerbation risk. Additionally, inspiratory muscle training (IMT) aims to increase diaphragm and inspiratory muscle endurance. In this regard, IMT has been studied in uncontrolled asthma patients to investigate its effect on respiratory symptoms and pulmonary functions. Methods: Twenty-one uncontrolled and partially controlled asthmatic patients were included in the study. Asthma control test (ACT), asthma quality of life questionnaire (AQLQ), and spirometric evaluations were performed. The study population was randomized into two groups. The standard care group (n=10) received standard medical treatment while the intervention (n=11) group practiced a portable threshold IMT device following standard medical treatment. Results: The study was completed by 15 patients due to 6 lost follow up (one intervention group and 5 standard care) and one asthma exacerbation. We have found that the intervention group tended to have increased pulmonary function test parameters and AQLQ scores, moreover; MIP values and ACT scores have statistically significant increases after IMT(p=0.01, p=0.02 respectively). Conclusion: Add-on IMT to standard medical treatment could improve asthma control by strengthening inspiratory muscles in uncontrolled asthmatic patients. IMT could be considered in the non-pharmacological treatments of uncontrolled asthmatic patients. Despite the limited number of patients, this study revealed that IMT might have positive outcomes for uncontrolled asthma patients.

A comparison of the effects of inspiratory muscle strength and endurance training on exercise capacity, respiratory muscle strength and endurance, and quality of life in pacemaker patients with heart failure: A randomized study

BackgroundStudies have widely investigated the effects of inspiratory muscle strength training in patients with heart failure (HF). The effects of inspiratory muscle strength or endurance training on outcomes in patients with pacemakers have not been adequately studied. ObjectivesThe aim was to compare the effects of inspiratory muscle strength and endurance training on exercise capacity, quality of life (QoL), peripheral and respiratory muscle strength, respiratory muscle endurance, pulmonary function, dyspnea, fatigue, and physical activity levels in pacemaker patients with HF. MethodsA randomized, controlled, double-blind study was conducted. Fourteen pacemaker patients with HF received inspiratory muscle strength training (IMST) at 50% of maximal inspiratory pressure (MIP), and 18 patients received endurance training (IMET) at 30% of MIP 7 days/8 weeks. Exercise capacity [6 min. walking test (6MWT) and the Incremental Shuttle Walking Test (ISWT)], pulmonary function, respiratory muscle strength [MIP, maximal expiratory pressure (MEP)], endurance, peripheral muscle strength, dyspnea, fatigue, QoL, and physical activity level were evaluated before and after. ResultsDemographic characteristics were similar in IMST (3F/11M, 56.92 ± 7.61y, EF: 25%, ICD/CRT:11/3) and IMET (4F/14M, 56 ± 10.77y, EF: 30%, ICD/CRT:16/2) groups (p > 0.05). Significant improvements were present in MIP, MEP, respiratory muscle endurance, peripheral muscle strength, 6MWT and ISWT walking distances, dyspnea, QoL, physical activity level, fatigue scores within groups (p ≤ 0.05). However, there were no significant differences between the groups (p > 0.05). There were no significant improvements in FEV1%, FVC%, FEV1/FVC%, and FEF25-75 within and between the groups (p > 0.05). ConclusionsInspiratory muscle strength and endurance training similarly improves respiratory and peripheral muscle strength, exercise capacity, QoL, physical activity level, and decreases dyspnea and fatigue and are safe and effective in pacemaker patients with HF. Trial registrationwww.ClinicalTrials.gov; study number: NCT03501355.

Respiratory muscle strength, exercise capacity and physical activity in patients with primary ciliary dyskinesia: A cross-sectional study

Background and objectivesThe pathophysiological mechanisms of primary ciliary dyskinesia (PCD) may affect many functions, including respiratory, physical, and health status. This study aimed to compare respiratory muscle strength, inspiratory muscle endurance, muscle strength, exercise capacity, physical activity levels, and quality of life in PCD patients and controls. MethodsTwenty-seven patients and 28 controls were included. Respiratory muscle strength (maximal inspiratory (MIP) and maximal expiratory (MEP) pressures), inspiratory muscle endurance (incremental threshold loading test), muscle strength (quadriceps femoris, shoulder abductor, elbow flexor, handgrip), exercise capacity (6-min walk test (6MWT)), physical activity and quality of life (QOL-PCD) were evaluated. ResultsMIP, inspiratory muscle endurance, quadriceps femoris, and handgrip muscle strength, 6MWT distance, total energy expenditure; childrens' (6–12 years) and their parents' physical function, upper, lower respiratory, and hearing symptoms and treatment burden QOL-PCD subscales scores were significantly lower in patients compared with controls (p < 0.05). The 66.7% of patients did not meet the optimal number of steps. MEP, shoulder abductor, and elbow flexor muscle strength, active energy expenditure, physical activity duration, average metabolic equivalents, number of steps, lying time, and sleep duration; childrens' and their parents' other subscales and adolescents’ all QOL-PCD subscales scores were similar between groups (p > 0.05). ConclusionInspiratory muscle strength and endurance, lower extremity and total muscle strength, exercise capacity, total energy expenditure, and childrens’ quality of life are impaired compared to healthy controls. Decreased physical activity level is prevalent in these patients. Effects of pulmonary rehabilitation on these impaired outcomes for PCD patients should be investigated. Trial registrationClinicaltrials.gov: NCT03370029; December 12, 2017.

REDUCED PERIPHERAL AND INSPIRATORY MUSCLE ENDURANCE IN PATIENTS WITH LIVER CIRRHOSIS: A CROSS-SECTIONAL STUDY.

Liver cirrhosis (LC) causes several musculoskeletal changes. To test the hypothesis that the peripheral and inspiratory muscle endurance are reduced in patients with liver cirrhosis. Twenty-one patients with LC (LC group; 61±14 years) and 18 age-matched subjects (control group; 56±17 years) had accepted to participate in this cross-sectional observational study. To assess peripheral muscle endurance, all volunteers performed a rhythmic handgrip exercise at 45% of their maximum voluntary contraction. A metronome was used to control the contraction-relaxation cycles at 60/min. The inspiratory muscle endurance was assessed using PowerBreath®. Participants underwent inspiratory muscle exercise at 60% of their maximal inspiratory muscle strength. The time until failure characterized the muscle endurance for both handgrip and inspiratory muscle exercises. Additionally, the quality of life of the participants was assessed. The muscle endurance was lower in the LC group when compared to the control group for both handgrip (67 vs 130 s, P<0.001) and inspiratory muscle exercises (40 vs 114 s, P<0.001). The peripheral muscle endurance was directly correlated with the total quality of life score (r=0.439, P=0.01) and to the following domains: fatigue (r=0.378 e P=0.030), activity (r=0.583, P=0.001), systemic symptoms (r=0.316, P=0.073) and preoccupation (r=0.370, P=0.034). The inspiratory muscle endurance was inversely correlated with the total quality of life score (r=0.573, P=0.001) and the following domains: fatigue (r=0.503, P=0.002), activity (r=0.464, P=0.004), systemic symptoms (r=0.472, P=0.004), abdominal symptoms (r=0.461, P=0.005), emotional function (r=0.387, P=0.02) and preoccupation (r=0.519, P=0.001). Both peripheral and inspiratory muscle endurance were lower in LC patients when compared to the control group.

Nox4 Knockout Does Not Prevent Diaphragm Atrophy, Contractile Dysfunction, or Mitochondrial Maladaptation in the Early Phase Post-Myocardial Infarction in Mice.

Diaphragm dysfunction with increased reactive oxygen species (ROS) occurs within 72 hrs post-myocardial infarction (MI) in mice and may contribute to loss of inspiratory maximal pressure and endurance in patients. We used wild-type (WT) and whole-body Nox4 knockout (Nox4KO) mice to measure diaphragm bundle force in vitro with a force transducer, mitochondrial respiration in isolated fiber bundles with an O2 sensor, mitochondrial ROS by fluorescence, mRNA (RT-PCR) and protein (immunoblot), and fiber size by histology 72 hrs post-MI. MI decreased diaphragm fiber cross-sectional area (CSA) (~15%, p = 0.015) and maximal specific force (10%, p = 0.005), and increased actin carbonylation (5-10%, p = 0.007) in both WT and Nox4KO. Interestingly, MI did not affect diaphragm mRNA abundance of MAFbx/atrogin-1 and MuRF-1 but Nox4KO decreased it by 20-50% (p < 0.01). Regarding the mitochondria, MI and Nox4KO decreased the protein abundance of citrate synthase and subunits of electron transport system (ETS) complexes and increased mitochondrial O2 flux (JO2) and H2O2 emission (JH2O2) normalized to citrate synthase. Mitochondrial electron leak (JH2O2/JO2) in the presence of ADP was lower in Nox4KO and not changed by MI. Our study shows that the early phase post-MI causes diaphragm atrophy, contractile dysfunction, sarcomeric actin oxidation, and decreases citrate synthase and subunits of mitochondrial ETS complexes. These factors are potential causes of loss of inspiratory muscle strength and endurance in patients, which likely contribute to the pathophysiology in the early phase post-MI. Whole-body Nox4KO did not prevent the diaphragm abnormalities induced 72 hrs post-MI, suggesting that systemic pharmacological inhibition of Nox4 will not benefit patients in the early phase post-MI.

Effectiveness of a preoperative breathing exercises intervention on patients undergoing cardiac surgery: a systematic review

Effectiveness of a preoperative breathing exercises intervention on patients undergoing cardiac surgery: a systematic review