Moderate- and High-Intensity Inspiratory Muscle Training Equally Improves Inspiratory Muscle Strength and Endurance—A Double-Blind Randomized Controlled Trial

2020 ◽  
pp. 1-9
Author(s):  
Patricia Rehder-Santos ◽  
Raphael M. Abreu ◽  
Étore De F. Signini ◽  
Claudio D. da Silva ◽  
Camila A. Sakaguchi ◽  
...  
Keyword(s):  
Muscle Strength ◽  
Oxygen Uptake ◽  
High Intensity ◽  
Peak Power ◽  
Sham Group ◽  
Inspiratory Muscle ◽  
Inspiratory Pressure ◽  
Moderate Intensity ◽  
Muscle Training ◽  
Inspiratory Muscle Strength

Background and Objective: Inspiratory muscle training (IMT) produced outstanding results in the physical performance of active subjects; however, little is known about the best training intensity for this population. The objective was to investigate the impact of an IMT of high intensity, using the critical inspiratory pressure (CIP), on inspiratory muscle strength (IMS), inspiratory muscle endurance (IME), peak power, and oxygen uptake of recreational cyclists; and to compare these results with moderate-intensity IMT (60% of maximal inspiratory pressure [MIP]). Methods: Thirty apparently healthy male recreational cyclists, 20–40 years old, underwent 11 weeks of IMT (3 times per week; 55 min per session). Participants were randomized into 3 groups: sham group (6 cmH2O; n = 8); 60% MIP (MIP60; n = 10) and CIP (n = 12). All participants performed the IMS test and incremental IME test at the first, fifth, ninth, and 13th weeks of the experimental protocol. Cardiopulmonary exercise testing was performed on an electromagnetic braking cycle ergometer pre-IMT and post-IMT. Data were analyzed using a 2-way repeated measures ANOVA (group and period factors). Results: IMS increased in CIP and MIP60 groups at the ninth and 13th weeks compared with the sham group (P < .001; β = 0.99). Regarding IME, there was an interaction between the CIP and MIP60 groups in all periods, except in the initial evaluation (P < .001; β = 1.00). Peak power (in watts) increased after IMT in CIP and MIP60 groups (P = .01; β = 0.67). Absolute oxygen uptake did not increase after IMT (P = .49; β = 0.05). Relative oxygen uptake to lean mass values did not change significantly (P = .48; β = 0.05). Conclusion: High-intensity IMT is beneficial on IMS, IME, and peak power, but does not provide additional gain to moderate intensity in recreational cyclists.

Effect of Moderate- or High-Intensity Inspiratory Muscle Strength Training on Maximal Inspiratory Mouth Pressure and Swimming Performance in Highly Trained Competitive Swimmers

2021 ◽  
pp. 1-7
Author(s):  
Toshiyuki Ohya ◽  
Kenta Kusanagi ◽  
Jun Koizumi ◽  
Ryosuke Ando ◽  
Keisho Katayama ◽  
...  
Keyword(s):  
Muscle Strength ◽  
Strength Training ◽  
High Intensity ◽  
Swimming Performance ◽  
Inspiratory Muscle ◽  
Inspiratory Pressure ◽  
Pressure Threshold ◽  
Mouth Pressure ◽  
Inspiratory Muscle Strength ◽  
Competitive Swimmers

Purpose: Inspiratory muscle strength training (IMST) can improve exercise performance. Increased maximal inspiratory mouth pressure (MIP) could be beneficial for swimmers to enhance their performance. This study aimed to clarify the effect of high-intensity IMST for 6 weeks on MIP and swimming performance in highly trained competitive swimmers. Methods: Thirty male highly trained competitive swimmers were assigned to high-intensity IMST (HI; n = 10), moderate-intensity IMST (MOD; n = 10), and control (n = 10) groups. The 6-week IMST intervention comprised twice daily sessions for 6 d/wk at inspiratory pressure threshold loads equivalent to 75% MIP (HI) and 50% MIP (MOD). Before and after the intervention, MIP and swimming performance were assessed. Swimming performance was evaluated in free and controlled frequency breathing 100-m freestyle swimming time trials in a 25-m pool. For controlled frequency breathing, participants took 1 breath every 6 strokes. Results: The MIP values after 2 and 6 weeks of IMST in the HI and MOD groups were significantly higher than those before IMST (P = .0001). The magnitudes of the MIP increases after 6 weeks of IMST did not differ between the HI (13.4% [8.7%]) and MOD (13.1% [10.1%]) groups (P = .44). The 100-m freestyle swimming times under the controlled frequency condition were significantly shorter after IMST than those before IMST in both the HI (P = .046) and MOD (P = .042) groups. Conclusions: Inspiratory pressure threshold load equivalent to 50% MIP could be sufficient to improve MIP and swimming performance under the controlled frequency breathing condition in highly trained competitive swimmers.

scholarly journals Inspiratory muscle strength in subjects with tetraplegia: viability of evaluation through the measurement of maximal inspiratory pressure

2014 ◽  
Vol 27 (3) ◽  
pp. 371-377
Author(s):  
Marlene Aparecida Moreno ◽  
Juliana Viana Paris ◽  
Raphael do Nascimento Pereira ◽  
Antonio Roberto Zamunér ◽  
Tais Mendes de Camargo ◽  
...  
Keyword(s):  
Muscle Strength ◽  
Cross Sectional Study ◽  
Inspiratory Muscle ◽  
Inspiratory Pressure ◽  
Maximal Inspiratory Pressure ◽  
Cross Sectional ◽  
Pressure Meter ◽  
Predicted Values ◽  
Inspiratory Muscle Strength ◽  
Sniff Nasal Inspiratory Pressure

Objective To analyze the values of maximal inspiratory pressure (MIP) and sniff nasal inspiratory pressure (SNIP) and to verify the existence of concordance between the two evaluation methodologies, in subjects with tetraplegia. Materials and methods Cross-sectional study with 17 tetraplegic men, aged 30.42 ± 7.67 years, who underwent MIP and SNIP evaluation using a respiratory pressure meter. Results The MIP and SNIP values obtained showed no difference when compared to each other (88.42 ± 29.39 vs. 86.68 ± 25.40 cmH2O, respectively). They were, however, significantly lower compared to the predicted values (MIP = 128.92 ± 7.18; SNIP = 114.11 ± 3.19 cmH2O), with the MIP values presenting correlation (r2 = 0.94; p < 0.0001) and concordance with those of the SNIP. Conclusions Both the MIP and SNIP values obtained were lower than the predicted values, indicating a reduction in inspiratory muscle strength (IMS). Both techniques showed correlation and concordance, suggesting that MIP can be used as a noninvasive method for IMS evaluation in this population.

scholarly journals Inspiratory muscle training for improving inspiratory muscle strength and functional capacity in older adults: a systematic review and meta-analysis

2020 ◽  
Author(s):  
James Manifield ◽  
Andrew Winnard ◽  
Emily Hume ◽  
Matthew Armstrong ◽  
Katherine Baker ◽  
...  
Keyword(s):  
Systematic Review ◽  
Older Adults ◽  
Muscle Strength ◽  
Functional Capacity ◽  
Meta Analysis ◽  
Inspiratory Muscle ◽  
Inspiratory Muscle Training ◽  
Cochrane Library ◽  
Muscle Training ◽  
Inspiratory Muscle Strength

Abstract Background The ageing process can result in the decrease of respiratory muscle strength and consequently increased work of breathing and associated breathlessness during activities of daily living in older adults. Objective This systematic review and meta-analysis aims to determine the effects of inspiratory muscle training (IMT) in healthy older adults. Methods A systematic literature search was conducted across four databases (Medline/Pubmed, Web of Science, Cochrane Library CINAHL) using a search strategy consisting of both MeSH and text words including older adults, IMT and functional capacity. The eligibility criteria for selecting studies involved controlled trials investigating IMT via resistive or threshold loading in older adults (&gt;60 years) without a long-term condition. Results Seven studies provided mean change scores for inspiratory muscle pressure and three studies for functional capacity. A significant improvement was found for maximal inspiratory pressure (PImax) following training (n = 7, 3.03 [2.44, 3.61], P = &lt;0.00001) but not for functional capacity (n = 3, 2.42 [−1.28, 6.12], P = 0.20). There was no significant correlation between baseline PImax and post-intervention change in PImax values (n = 7, r = 0.342, P = 0.453). Conclusions IMT can be beneficial in terms of improving inspiratory muscle strength in older adults regardless of their initial degree of inspiratory muscle weakness. Further research is required to investigate the effect of IMT on functional capacity and quality of life in older adults.

Impact of respiratory muscle training on respiratory muscle strength, respiratory function and quality of life in individuals with tetraplegia: a randomised clinical trial

Thorax ◽  
2020 ◽  
Vol 75 (3) ◽  
pp. 279-288 ◽  
Author(s):  
Claire L Boswell-Ruys ◽  
Chaminda R H Lewis ◽  
Nirupama S Wijeysuriya ◽  
Rachel A McBain ◽  
Bonsan Bonne Lee ◽  
...  
Keyword(s):  
Quality Of Life ◽  
Muscle Strength ◽  
Lung Function ◽  
Respiratory Muscle ◽  
Respiratory Health ◽  
Inspiratory Muscle ◽  
Respiratory Muscle Training ◽  
Muscle Training ◽  
Inspiratory Muscle Strength

BackgroundRespiratory complications remain a leading cause of morbidity and mortality in people with acute and chronic tetraplegia. Respiratory muscle weakness following spinal cord injury-induced tetraplegia impairs lung function and the ability to cough. In particular, inspiratory muscle strength has been identified as the best predictor of the likelihood of developing pneumonia in individuals with tetraplegia. We hypothesised that 6 weeks of progressive respiratory muscle training (RMT) increases respiratory muscle strength with improvements in lung function, quality of life and respiratory health.MethodsSixty-two adults with tetraplegia participated in a double-blind randomised controlled trial. Active or sham RMT was performed twice daily for 6 weeks. Inspiratory muscle strength, measured as maximal inspiratory pressure (PImax) was the primary outcome. Secondary outcomes included lung function, quality of life and respiratory health. Between-group comparisons were obtained with linear models adjusting for baseline values of the outcomes.ResultsAfter 6 weeks, there was a greater improvement in PImax in the active group than in the sham group (mean difference 11.5 cmH2O (95% CI 5.6 to 17.4), p<0.001) and respiratory symptoms were reduced (St George Respiratory Questionnaire mean difference 10.3 points (0.01–20.65), p=0.046). Significant improvements were observed in quality of life (EuroQol-Five Dimensional Visual Analogue Scale 14.9 points (1.9–27.9), p=0.023) and perceived breathlessness (Borg score 0.64 (0.11–1.17), p=0.021). There were no significant improvements in other measures of respiratory function (p=0.126–0.979).ConclusionsProgressive RMT increases inspiratory muscle strength in people with tetraplegia, by a magnitude which is likely to be clinically significant. Measurement of baseline PImax and provision of RMT to at-risk individuals may reduce respiratory complications after tetraplegia.Trial registration numberAustralian New Zealand Clinical Trials Registry (ACTRN 12612000929808).

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