Comparison of Inspiratory Muscle Strength Training Effects Between Older Subjects With and Without Chronic Obstructive Pulmonary Disease

Yang, Gee-Gwo; Wu, Ying-Tai; Lee, Chih-Wei

doi:10.1016/s0929-6646(11)60078-8

Cited by 38 publications

(28 citation statements)

References 31 publications

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“…Moreover, diaphragm fast-fatigable fibers are activated only with the highest imposed loads and expulsive reflexes [48], [78]. Clinically, IMST of patients has been shown to increase strength, reduce dyspnea, and facilitate weaning from MV [7], [79]–[81]. We speculate that fast-fiber hypertrophy could be particularly beneficial to patients with respiratory muscle weakness and cough dysfunction, which are highly predictive of ventilatory failure [82]–[85].…”

Section: Discussionmentioning

confidence: 89%

Chronic Intrinsic Transient Tracheal Occlusion Elicits Diaphragmatic Muscle Fiber Remodeling in Conscious Rodents

et al. 2012

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BackgroundAlthough the prevalence of inspiratory muscle strength training has increased in clinical medicine, its effect on diaphragm fiber remodeling is not well-understood and no relevant animal respiratory muscle strength training-rehabilitation experimental models exist. We tested the postulate that intrinsic transient tracheal occlusion (ITTO) conditioning in conscious animals would provide a novel experimental model of respiratory muscle strength training, and used significant increases in diaphragmatic fiber cross-sectional area (CSA) as the primary outcome measure. We hypothesized that ITTO would increase costal diaphragm fiber CSA and further hypothesized a greater duration and magnitude of occlusions would amplify remodeling.Methodology/Principal FindingsSprague-Dawley rats underwent surgical placement of a tracheal cuff and were randomly assigned to receive daily either 10-minute sessions of ITTO, extended-duration, 20-minute ITTO (ITTO-20), partial obstruction with 50% of cuff inflation pressure (ITTO-PAR) or observation (SHAM) over two weeks. After the interventions, fiber morphology, myosin heavy chain composition and CSA were examined in the crural and ventral, medial, and dorsal costal regions. In the medial costal diaphragm, with ITTO, type IIx/b fibers were 26% larger in the medial costal diaphragm (p<0.01) and 24% larger in the crural diaphragm (p<0.05). No significant changes in fiber composition or morphology were detected. ITTO-20 sessions also yielded significant increases in medial costal fiber cross-sectional area, but the effects were not greater than those elicited by 10-minute sessions. On the other hand, ITTO-PAR resulted in partial airway obstruction and did not generate fiber hypertrophy.Conclusions/SignificanceThe results suggest that the magnitude of the load was more influential in altering fiber cross-sectional area than extended-duration conditioning sessions. The results also indicated that ITTO was associated with type II fiber hypertrophy in the medial costal region of the diaphragm and may be an advantageous experimental model of clinical respiratory muscle strength training.

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Section: Discussionmentioning

confidence: 89%

Chronic Intrinsic Transient Tracheal Occlusion Elicits Diaphragmatic Muscle Fiber Remodeling in Conscious Rodents

et al. 2012

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“…For that, researchers found that PR-IMT devices had an impact on their health status by strengthening their respiratory muscles and improving daily life activities. Regarding applying high intensities of PR-IMT on COPD patients, two studies [19,20] had a sample of nearly 35 subjects; the intensities were highly similar (nearly up to 80% of MIP in both) and applied six weeks training period. Huang et al, [19] the investigators applied daily training twice a day, each session lasts for 15 minutes.…”

Section: Introductionmentioning

confidence: 99%

“…Regarding applying high intensities of PR-IMT on COPD patients, two studies [19,20] had a sample of nearly 35 subjects; the intensities were highly similar (nearly up to 80% of MIP in both) and applied six weeks training period. Huang et al, [19] the investigators applied daily training twice a day, each session lasts for 15 minutes. While, Madariaga et al [20] applied five days of training per week.…”

Section: Introductionmentioning

confidence: 99%

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A Comparison between Two Types of Resistive Inspiratory Muscle Training Devices in Normal Subjects in Regards to Pulmonary Functions

Alwohayeb¹,

Alenazi²,

Albuainain³

et al. 2018

Int J Phys Med Rehabil

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Introduction: Inspiratory muscle training (IMT) devices improve respiratory muscle strength, endurance and exercise capacity on healthy subjects. Because of the limited availability of the effect of IMT devices on healthy subjects with minimal activity level, this study was conducted to evaluate the effects of POWERbreath-plus® and Threshold IMT® on healthy subjects by measuring pre and post Maximal inspiratory pressure (MIP), Maximal expiratory pressure (MEP), Peak Expiratory Flow Rate (PEFR) and Mandatory Voluntary Ventilation (MVV) and to compare their effectiveness.

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“…MIP is indicative of ventilatory capacity 1) and is particularly useful for monitoring inspiratory muscle weakness of patients 2) . However, there is substantial variation in published MIP data [3][4][5] ; furthermore, in Taiwan, people often do not produce the recommended MIP reference values 6) . Most MIP reference values are derived from measurements of Caucasians, and at least 2 studies with large sample sizes 7,8) and other smaller studies 4,5) concluded that there is no ethnic effect on MIP.…”

Section: Introductionmentioning

confidence: 99%

Video Instruction for Measuring Maximal Inspiratory Pressure

Lee

Shih

2012

J Phys Ther Sci

Self Cite

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Abstract. [Purpose] There is a large variance in published maximal inspiratory pressure (MIP) data. We propose video instruction as a method of instruction for undergoing MIP testing. Two types of instruction were compared: video-watching instruction (VW), in which participants watched a recorded demonstration of the MIP measurement procedure; and personal explanation instruction (PE), a traditional in-person demonstration provided by the researcher. We conducted a cross-over design experiment with a 12-week washout period, and counterbalanced the order in which the 2 methods were trialed.[Methods] Participants (n = 40, mean age 21.0 ± 2.5 y) were randomly assigned to either the VW or the PE group. Twelve weeks after receiving instruction, half of the participants from each group were retested for their MIP after receiving the alternate instruction method. [Results] We found no betweenparticipants or within-participants differences in MIP between the VW and PE instruction methods, indicating that the participants performed equally well in the measurement. The intraclass correlation coefficient indicated that MIP measurements after both instruction methods had good reproducibility.[Conclusions] Video instruction provides consistency in delivering instruction, reduces labor, and provides reliability in delivering MIP. These benefits will allow larger, multiple-site studies to be conducted.

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Comparison of Inspiratory Muscle Strength Training Effects Between Older Subjects With and Without Chronic Obstructive Pulmonary Disease

Cited by 38 publications

References 31 publications

Chronic Intrinsic Transient Tracheal Occlusion Elicits Diaphragmatic Muscle Fiber Remodeling in Conscious Rodents

Chronic Intrinsic Transient Tracheal Occlusion Elicits Diaphragmatic Muscle Fiber Remodeling in Conscious Rodents

A Comparison between Two Types of Resistive Inspiratory Muscle Training Devices in Normal Subjects in Regards to Pulmonary Functions

Video Instruction for Measuring Maximal Inspiratory Pressure

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