1
|
Koizumi J, Ohya T. Effects of high-intensity inspiratory muscle warm-up on inspiratory muscle strength and accessory inspiratory muscle activity. Respir Physiol Neurobiol 2023; 313:104069. [PMID: 37141931 DOI: 10.1016/j.resp.2023.104069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2023] [Revised: 04/21/2023] [Accepted: 04/30/2023] [Indexed: 05/06/2023]
Abstract
This study aimed to determine the effects of work-matched moderate-intensity and high-intensity inspiratory muscle warm-up (IMW) on inspiratory muscle strength and accessory inspiratory muscle activity. Eleven healthy men performed three IMWs at different intensities, namely, placebo, moderate-intensity, and high-intensity, set, respectively, at 15%, 40%, and 80% of maximal inspiratory mouth pressure (MIP). MIP was measured before and after IMW. Electromyography (EMG) was recorded for the sternocleidomastoid muscle (SCM) and intercostal muscles (IC) during IMW. MIP increased significantly in the moderate-intensity condition (104.2 ± 5.1%, p<0.05) and high-intensity condition (106.5 ± 6.2%, p<0.01) after IMW. The EMG amplitudes of the SCM and IC during IMW were significantly higher in the order of high-intensity, moderate-intensity, and placebo conditions. There was a significant correlation between changes in MIP and EMG amplitude of the SCM (r=0.60, p<0.01) and IC (r=0.47, p<0.01) during IMW. These findings suggest that high-intensity IMW increases neuromuscular activity in the accessory inspiratory muscles, which may improve inspiratory muscle strength.
Collapse
Affiliation(s)
- Jun Koizumi
- Graduate School of Health and Sport Science, Chukyo University, Aichi, Japan.
| | - Toshiyuki Ohya
- Graduate School of Health and Sport Science, Chukyo University, Aichi, Japan; School of Health and Sport Science, Chukyo University, Aichi, Japan
| |
Collapse
|
2
|
Manchado-Gobatto FB, Torres RS, Marostegan AB, Rasteiro FM, Hartz CS, Moreno MA, Pinto AS, Gobatto CA. Complex Network Model Reveals the Impact of Inspiratory Muscle Pre-Activation on Interactions among Physiological Responses and Muscle Oxygenation during Running and Passive Recovery. BIOLOGY 2022; 11:biology11070963. [PMID: 36101345 PMCID: PMC9311794 DOI: 10.3390/biology11070963] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Revised: 06/11/2022] [Accepted: 06/14/2022] [Indexed: 12/05/2022]
Abstract
Simple Summary Different warm-ups can be used to improve physical and sports performance. Among these strategies, we can include the pre-activation of the inspiratory muscles. Our study aimed to investigate this pre-activation model in high-intensity running performance and recovery using an integrative computational analysis called a complex network. The participants in this study underwent four sessions. The first and second sessions were performed to explain the procedures, characterize them and determine the individualized pre-activation intensity (40% of the maximum inspiratory pressure). Subsequently, on different days, the subjects were submitted to high-intensity tethered runs on a non-motorized treadmill with monitoring of the physiological responses during and after this effort. To understand the impacts of the pre-activation of inspiratory muscles on the organism, we studied the centrality metrics obtained by complex networks, which help in the interpretation of data in a more integrated way. Our results revealed that the graphs generated by this analysis were altered when inspiratory muscle pre-activation was applied, emphasizing muscle oxygenation responses in the leg and arm. Blood lactate also played an important role, especially after our inspiratory muscle strategy. Our findings confirm that the pre-activation of inspiratory muscles promotes modulations in the organism, better integrating physiological responses, which could increase performance and improve recovery. Abstract Although several studies have focused on the adaptations provided by inspiratory muscle (IM) training on physical demands, the warm-up or pre-activation (PA) of these muscles alone appears to generate positive effects on physiological responses and performance. This study aimed to understand the effects of inspiratory muscle pre-activation (IMPA) on high-intensity running and passive recovery, as applied to active subjects. In an original and innovative investigation of the impacts of IMPA on high-intensity running, we proposed the identification of the interactions among physical characteristics, physiological responses and muscle oxygenation in more and less active muscle to a running exercise using a complex network model. For this, fifteen male subjects were submitted to all-out 30 s tethered running efforts preceded or not preceded by IMPA, composed of 2 × 15 repetitions (1 min interval between them) at 40% of the maximum individual inspiratory pressure using a respiratory exercise device. During running and recovery, we monitored the physiological responses (heart rate, blood lactate, oxygen saturation) and muscle oxygenation (in vastus lateralis and biceps brachii) by wearable near-infrared spectroscopy (NIRS). Thus, we investigated four scenarios: two in the tethered running exercise (with or without IMPA) and two built into the recovery process (after the all-out 30 s), under the same conditions. Undirected weighted graphs were constructed, and four centrality metrics were analyzed (Degree, Betweenness, Eigenvector, and Pagerank). The IMPA (40% of the maximum inspiratory pressure) was effective in increasing the peak and mean relative running power, and the analysis of the complex networks advanced the interpretation of the effects of physiological adjustments related to the IMPA on exercise and recovery. Centrality metrics highlighted the nodes related to muscle oxygenation responses (in more and less active muscles) as significant to all scenarios, and systemic physiological responses mediated this impact, especially after IMPA application. Our results suggest that this respiratory strategy enhances exercise, recovery and the multidimensional approach to understanding the effects of physiological adjustments on these conditions.
Collapse
Affiliation(s)
- Fúlvia Barros Manchado-Gobatto
- Laboratory of Applied Sport Physiology, School of Applied Sciences, University of Campinas, Limeira 13484-350, Brazil; (A.B.M.); (F.M.R.); (C.A.G.)
- Correspondence:
| | - Ricardo Silva Torres
- Department of ICT and Natural Sciences, Norwegian University of Science and Technology, 6009 Ålesund, Norway;
| | - Anita Brum Marostegan
- Laboratory of Applied Sport Physiology, School of Applied Sciences, University of Campinas, Limeira 13484-350, Brazil; (A.B.M.); (F.M.R.); (C.A.G.)
| | - Felipe Marroni Rasteiro
- Laboratory of Applied Sport Physiology, School of Applied Sciences, University of Campinas, Limeira 13484-350, Brazil; (A.B.M.); (F.M.R.); (C.A.G.)
| | - Charlini Simoni Hartz
- Postgraduate Program in Human Movement Sciences, Methodist University of Piracicaba, Piracicaba 13400-000, Brazil; (C.S.H.); (M.A.M.)
| | - Marlene Aparecida Moreno
- Postgraduate Program in Human Movement Sciences, Methodist University of Piracicaba, Piracicaba 13400-000, Brazil; (C.S.H.); (M.A.M.)
| | - Allan Silva Pinto
- Department of Sport Sciences, Faculty of Physical Education, University of Campinas, Campinas 13083-851, Brazil;
- Brazilian Synchrotron Light Laboratory, Brazilian Center for Research in Energy and Materials, Campinas 13083-970, Brazil
| | - Claudio Alexandre Gobatto
- Laboratory of Applied Sport Physiology, School of Applied Sciences, University of Campinas, Limeira 13484-350, Brazil; (A.B.M.); (F.M.R.); (C.A.G.)
| |
Collapse
|
3
|
Abstract
While the traditional lung function tests are used to assess lung capacity and pulmonary function, they cannot evaluate respiratory driving function and the integrity of the conduction pathway from the central nervous system to the respiratory motor neuron in the spinal cord and to the diaphragm. The inspiratory trigger is sent from the central nervous system through the phrenic nerve and drives the diaphragm to generate inspiratory movement. Therefore, phrenic nerve stimulation and diaphragmatic electromyography are two fundamental methods to assess respiratory function. There are several useful tools to assess respiratory motor system including electrical or magnetic phrenic nerve stimulation, diaphragmatic needle electromyography, and diaphragmatic ultrasound. By these means, physicians can assess current respiratory status in different neurological diseases that affect respiratory muscles, follow-up of the severity of respiratory impairment, help to predict the chance of successfully weaning from ventilatory support, and confirm clinical diagnoses such as diaphragmatic myoclonus. Although some of these tests require special training, applying these neurophysiological assessments in clinical practice is highly recommended.
Collapse
Affiliation(s)
- Yih-Chih Jacinta Kuo
- Department of Neurology, National Taiwan University Hospital Hsin-Chu Branch, Hsin-Chu, Taiwan
| | - Kai-Hsiang Stanley Chen
- Department of Neurology, National Taiwan University Hospital Hsin-Chu Branch, Hsin-Chu, Taiwan.
| |
Collapse
|
4
|
Piotrowska M, Okrzymowska P, Kucharski W, Rożek-Piechura K. Application of Inspiratory Muscle Training to Improve Physical Tolerance in Older Patients with Ischemic Heart Failure. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2021; 18:ijerph182312441. [PMID: 34886168 PMCID: PMC8657106 DOI: 10.3390/ijerph182312441] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/13/2021] [Revised: 11/20/2021] [Accepted: 11/24/2021] [Indexed: 11/23/2022]
Abstract
Regardless of the management regime for heart failure (HF), there is strong evidence supporting the early implementation of exercise-based cardiac rehabilitation (CR). Respiratory therapy is considered to be an integral part of such secondary prevention protocols. The aim of the study was to evaluate the effect of inspiratory muscle training (IMT) on exercise tolerance and the functional parameters of the respiratory system in patients with heart failure involved in cardiac rehabilitation. The study included 90 patients with HF who took part in the second-stage 8-week cycle of cardiac rehabilitation (CR). They were randomly divided into three groups: Group I underwent CR and IMT; Group II only CR; and patients in Group III underwent only the IMT. Before and after the 8-week cycle, participants were assessed for exercise tolerance and the functional parameters of respiratory muscle strength. Significant statistical improvement concerned the majority of the hemodynamic parameters, lung function parameters, and respiratory muscle strength in the first group. Moreover, the enhancement in the exercise tolerance in the CR + IMT group was accompanied by a negligible change in the HRpeak. The results confirm that the addition of IMT to the standard rehabilitation process of patients with heart failure can increase the therapeutic effect while influencing some of the parameters measured by exercise electrocardiography and respiratory function.
Collapse
Affiliation(s)
- Monika Piotrowska
- Department of Physiotherapy in Internal Disease, Wroclaw University of Health and Sport, Al. I.J. Paderewskiego 35, Building P4, 51-612 Wrocław, Poland; (M.P.); (K.R.-P.)
| | - Paulina Okrzymowska
- Department of Physiotherapy in Internal Disease, Wroclaw University of Health and Sport, Al. I.J. Paderewskiego 35, Building P4, 51-612 Wrocław, Poland; (M.P.); (K.R.-P.)
- Correspondence:
| | - Wojciech Kucharski
- Department of Human Biology, Wroclaw University of Health and Sport Sciences, Al. I.J. Paderewskiego 35, Building P4, 51-612 Wrocław, Poland;
- Cardiac Rehabilitation Unit, Hospital of Vratislavia Medica, Saint John Paul II, ul. Lekarska 1, 51-134 Wrocław, Poland
| | - Krystyna Rożek-Piechura
- Department of Physiotherapy in Internal Disease, Wroclaw University of Health and Sport, Al. I.J. Paderewskiego 35, Building P4, 51-612 Wrocław, Poland; (M.P.); (K.R.-P.)
| |
Collapse
|
5
|
Barnes KR, Ludge AR. Inspiratory Muscle Warm-up Improves 3,200-m Running Performance in Distance Runners. J Strength Cond Res 2021; 35:1739-1747. [PMID: 30640308 DOI: 10.1519/jsc.0000000000002974] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
ABSTRACT Barnes, KR and Ludge, AR. Inspiratory muscle warm-up improves 3,200-m running performance in distance runners. J Strength Cond Res 35(6): 1739-1747, 2021-This study examined the effects of an inspiratory muscle exercise as part of a warm-up (IMW) using a resisted breathing trainer on running performance. In a randomized crossover design, 17 trained distance runners completed two 3,200-m performance trials on separate days, preceded by 2 different warm-up procedures: IMW or sham IMW (CON). In each condition, subjects performed 30 breaths against either 50% of each athlete's peak strength (IMW) or 30 slow protracted breaths against negligible resistance (CON). Perceived race readiness and inspiratory muscle strength, flow, power, and volume were measured before and after each warm-up. Heart rate (HR), rating of perceived exertion (RPE) and dyspnea (RPD), and expired gases were collected during each trial. A 3,200-m run performance was 2.8% ± 1.5% (20.4-second) faster after IMW (effect size [ES] = 0.37, p = 0.02). After each warm-up condition, there was as small effect on peak inspiratory strength (6.6 ± 4.8%, ES = 0.22, p = 0.02), flow (5.2 ± 4.4%, ES = 0.20, p = 0.03), power (17.6 ± 16.7%, ES = 0.22, p = 0.04), and volume (6.7 ± 6.3%, ES = 0.24, p = 0.01) after IMW compared with CON. There were no differences in HR, minute volume, peak V̇o2, or V̇o2 at each 800-m interval between conditions (ES ≤ 0.13, p > 0.17). There were small differences in RPE at 800 m and 1,600 m (ES = 0.32, p = 0.17; ES = 0.21, p = 0.38, respectively), but no difference at the last 1,600 m (p = 1.0). There was a moderate positive effect on RPD (ES = 0.81, p < 0.001) and race readiness (ES = 0.76, p < 0.01) after IMW. Overall, the data suggest that IMW improves 3,200-m performance because of enhancements in inspiratory muscle function characteristics and reduction in dyspnea.
Collapse
Affiliation(s)
- Kyle R Barnes
- Department of Movement Science, Grand Valley State University, Allendale, Michigan
| | | |
Collapse
|
6
|
Hardy TA, How SC, Taylor BJ. The Effect of Preexercise Expiratory Muscle Loading on Exercise Tolerance in Healthy Men. Med Sci Sports Exerc 2021; 53:421-430. [PMID: 32735113 DOI: 10.1249/mss.0000000000002468] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
PURPOSE Acute nonfatiguing inspiratory muscle loading transiently increases diaphragm excitability and global inspiratory muscle strength and may improve subsequent exercise performance. We investigated the effect of acute expiratory muscle loading on expiratory muscle function and exercise tolerance in healthy men. METHODS Ten males cycled at 90% of peak power output to the limit of tolerance (TLIM) after 1) 2 × 30 expiratory efforts against a pressure-threshold load of 40% maximal expiratory gastric pressure (PgaMAX) (EML-EX) and 2) 2 × 30 expiratory efforts against a pressure-threshold load of 10% PgaMAX (SHAM-EX). Changes in expiratory muscle function were assessed by measuring the mouth pressure (PEMAX) and PgaMAX responses to maximal expulsive efforts and magnetically evoked (1 Hz) gastric twitch pressure (Pgatw). RESULTS Expiratory loading at 40% of PgaMAX increased PEMAX (10% ± 5%, P = 0.001) and PgaMAX (9% ± 5%, P = 0.004). Conversely, there was no change in PEMAX (166 ± 40 vs 165 ± 35 cm H2O, P = 1.000) or PgaMAX (196 ± 38 vs 192 ± 39 cm H2O, P = 0.215) from before to after expiratory loading at 10% of PgaMAX. Exercise time was not different in EML-EX versus SHAM-EX (7.91 ± 1.96 vs 8.09 ± 1.77 min, 95% CI = -1.02 to 0.67, P = 0.651). Similarly, exercise-induced expiratory muscle fatigue was not different in EML-EX versus SHAM-EX (-28% ± 12% vs -26% ± 7% reduction in Pgatw amplitude, P = 0.280). Perceptual ratings of dyspnea and leg discomfort were not different during EML-EX versus SHAM-EX. CONCLUSION Acute expiratory muscle loading enhances expiratory muscle function but does not improve subsequent severe-intensity exercise tolerance in healthy men.
Collapse
Affiliation(s)
- Tim A Hardy
- Faculty of Biological Sciences, School of Biomedical Sciences, University of Leeds, Leeds, UNITED KINGDOM
| | - Stephen C How
- School of Sport and Exercise, University of Gloucestershire, Gloucester, UNITED KINGDOM
| | | |
Collapse
|
7
|
Manifield J, Chynkiamis N, Alexiou C, Megaritis D, Hume E, Barry G, Vogiatzis I. Acute thoracoabdominal and hemodynamic responses to tapered flow resistive loading in healthy adults. Respir Physiol Neurobiol 2021; 286:103617. [PMID: 33454351 DOI: 10.1016/j.resp.2021.103617] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Revised: 12/22/2020] [Accepted: 01/01/2021] [Indexed: 11/17/2022]
Abstract
We investigated the acute physiological responses of tapered flow resistive loading (TFRL) at 30, 50 and 70 % maximal inspiratory pressure (PImax) in 12 healthy adults to determine an optimal resistive load. Increased end-inspiratory rib cage and decreased end-expiratory abdominal volumes equally contributed to the expansion of thoracoabdominal tidal volume (captured by optoelectronic plethysmography). A significant decrease in end-expiratory thoracoabdominal volume was observed from 30 to 50 % PImax, from 30 to 70 % PImax, and from 50 to 70 % PImax. Cardiac output (recorded by cardio-impedance) increased from rest by 30 % across the three loading trials. Borg dyspnoea increased from 2.36 ± 0.20 at 30 % PImax, to 3.45 ± 0.21 at 50 % PImax, and 4.91 ± 0.25 at 70 % PImax. End-tidal CO2 decreased from rest during 30, 50 and 70 %PImax (26.23 ± 0.59, 25.87 ± 1.02 and 24.30 ± 0.82 mmHg, respectively). Optimal intensity for TFRL is at 50 % PImax to maximise global respiratory muscle and cardiovascular loading whilst minimising hyperventilation and breathlessness.
Collapse
Affiliation(s)
- James Manifield
- Department of Sport, Exercise and Rehabilitation, Northumbria University, Newcastle Upon Tyne, NE1 8ST, UK.
| | - Nikolaos Chynkiamis
- Department of Sport, Exercise and Rehabilitation, Northumbria University, Newcastle Upon Tyne, NE1 8ST, UK
| | - Charikleia Alexiou
- Department of Sport, Exercise and Rehabilitation, Northumbria University, Newcastle Upon Tyne, NE1 8ST, UK
| | - Dimitrios Megaritis
- Department of Sport, Exercise and Rehabilitation, Northumbria University, Newcastle Upon Tyne, NE1 8ST, UK
| | - Emily Hume
- Department of Sport, Exercise and Rehabilitation, Northumbria University, Newcastle Upon Tyne, NE1 8ST, UK
| | - Gill Barry
- Department of Sport, Exercise and Rehabilitation, Northumbria University, Newcastle Upon Tyne, NE1 8ST, UK
| | - Ioannis Vogiatzis
- Department of Sport, Exercise and Rehabilitation, Northumbria University, Newcastle Upon Tyne, NE1 8ST, UK
| |
Collapse
|
8
|
Mackała K, Kurzaj M, Okrzymowska P, Stodółka J, Coh M, Rożek-Piechura K. The Effect of Respiratory Muscle Training on the Pulmonary Function, Lung Ventilation, and Endurance Performance of Young Soccer Players. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2019; 17:E234. [PMID: 31905644 PMCID: PMC6981841 DOI: 10.3390/ijerph17010234] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/06/2019] [Revised: 12/23/2019] [Accepted: 12/24/2019] [Indexed: 12/31/2022]
Abstract
This study investigated whether the addition of eight weeks of inspiratory muscle training (IMT) to a regular preseason soccer training program, including incremental endurance training (IET), would change pulmonary function, lung ventilation, and aerobic performance in young soccer players. Sixteen club-level competitive junior soccer players (mean age 17.63 ± 0.48 years, height 182 ± 0.05 cm, body mass 68.88 ± 4.48 kg) participated in the study. Participants were randomly assigned into two groups: experimental (n = 8) and control (n = 8). Both groups performed regular preseason soccer training, including endurance workouts as IET. In addition to this training, the experimental group performed additional IMT for eigght weeks with a commercially available respiratory muscle trainer (Threshold IMT), with a total of 80 inhalations (twice per day, five days per week). Pre- and post-intervention tests of pulmonary function, maximal inspiratory pressure, and the Cooper test were implemented. Eight weeks of IMT had a positive impact on expiratory muscle strength (p = 0.001); however, there was no significant effect on respiratory function parameters. The results also indicate increased efficiency of the inspiratory muscles, contributing to an improvement in aerobic endurance, measured by VO₂max estimated from running distance in the cardiorespiratory Cooper test (p < 0.005).
Collapse
Affiliation(s)
- Krzysztof Mackała
- Department of Track and Field, University School of Physical Education, Wroclaw, Ul. Paderewskiego 35, 51-612 Wrocław, Poland;
| | - Monika Kurzaj
- Faculty of Physiotherapy, University School of Physical Education in Wroclaw, Poland, Ul. Paderewskiego 35, 51-612 Wrocław, Poland; (M.K.); (P.O.); (K.R.-P.)
| | - Paulina Okrzymowska
- Faculty of Physiotherapy, University School of Physical Education in Wroclaw, Poland, Ul. Paderewskiego 35, 51-612 Wrocław, Poland; (M.K.); (P.O.); (K.R.-P.)
| | - Jacek Stodółka
- Department of Track and Field, University School of Physical Education, Wroclaw, Ul. Paderewskiego 35, 51-612 Wrocław, Poland;
| | - Milan Coh
- Faculty of Sport, University of Ljubljana, Gortanova ul. 22, 1000 Ljubljana, Slovenia;
| | - Krystyna Rożek-Piechura
- Faculty of Physiotherapy, University School of Physical Education in Wroclaw, Poland, Ul. Paderewskiego 35, 51-612 Wrocław, Poland; (M.K.); (P.O.); (K.R.-P.)
| |
Collapse
|
9
|
Kurzaj M, Dziubek W, Porębska M, Rożek-Piechura K. Can Inspiratory Muscle Training Improve Exercise Tolerance and Lower Limb Function After Myocardial Infarction? Med Sci Monit 2019; 25:5159-5169. [PMID: 31296834 PMCID: PMC6642672 DOI: 10.12659/msm.914684] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Background Respiratory therapy is an integral part of treatment of cardiac patients. The aim of this study was to evaluate the effect of addition of inspiratory muscle training (IMT) to second-stage cardiac rehabilitation on exercise tolerance and function of lower extremities in patients following myocardial infarction (MI). Material/Methods This study included 90 patients (mean age 65 years) with MI who took part in the second stage of an 8-week cycle of cardiac rehabilitation (CR). They were divided into 3 groups: group I underwent CR and IMT, group II only underwent CR, and group III only underwent IMT. Groups I and II were allocated randomly according sealed opaque envelopes. The third group consisted of patients who could not participate in standard rehabilitation for various reasons. Before and after the 8-week program, participants were assessed for maximal inspiratory and expiratory pressure (PImax and PEmax) values, exercise tolerance, and knee muscle strength. Results In groups I and II, a significant increase in the PImax parameters and exercise tolerance parameters (MET) were observed. Group I had increased PEmax parameters. In group III, the same changes in the parameter values that reflect respiratory muscle function were observed. All of the examined strength parameters of the knee joint muscles demonstrated improvement in all of the investigated groups, but the biggest differences were observed in group I. Conclusions Use of IMT in the ambulatory rehabilitation program of MI patients resulted in improved rehabilitation efficacy, leading to a significant improvement in physical condition.
Collapse
Affiliation(s)
- Monika Kurzaj
- Department of Physiotherapy, University of Physical Education, Wrocław, Poland
| | - Wioletta Dziubek
- Department of Physiotherapy, University of Physical Education, Wrocław, Poland
| | - Małgorzata Porębska
- Cardiology Outpatient Clinic - Lower Silesian Center for Diagnostics and Cardiac Therapy MEDINET, Wrocław, Poland.,Center for Prevention and Rehabilitation of the "CREATOR" Non-Public Healthcare Center, Wrocław, Poland
| | | |
Collapse
|
10
|
Faghy MA, Brown PI. Whole-body active warm-up and inspiratory muscle warm-up do not improve running performance when carrying thoracic loads. Appl Physiol Nutr Metab 2017; 42:810-815. [PMID: 28288302 DOI: 10.1139/apnm-2016-0711] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Whole-body active warm-ups (AWU) and inspiratory muscle warm-up (IMW) prior to exercise improves performance on some endurance exercise tasks. This study investigated the effects of AWU with and without IMW upon 2.4-km running time-trial performance while carrying a 25-kg backpack, a common task and backpack load in physically demanding occupations. Participants (n = 9) performed five 2.4-km running time-trials with a 25-kg thoracic load preceded in random order by (i) IMW comprising 2 × 30 inspiratory efforts against a pressure-threshold load of 40% maximal inspiratory pressure (PImax), (ii) 10-min unloaded running (AWU) at lactate turnpoint (10.33 ± 1.58 km·h-1), (iii) placebo IMW (PLA) comprising 5-min breathing using a sham device, (iv) AWU+IMW, and (v) AWU+PLA. Pooled baseline PImax was similar between trials and increased by 7% and 6% following IMW and AWU+IMW (P < 0.05). Relative to baseline, pooled PImax was reduced by 9% after the time-trial, which was not different between trials (P > 0.05). Time-trial performance was not different between any trials. Whole-body AWU and IMW performed alone or combination have no ergogenic effect upon high-intensity, short-duration performance when carrying a 25-kg load in a backpack.
Collapse
Affiliation(s)
- Mark A Faghy
- a College of Life and Natural Sciences, University of Derby, Derby DE22 1GB, UK
| | - Peter I Brown
- b English Institute of Sport, Loughborough High Performance Centre, Loughborough Leicestershire LE11 3TU, UK
| |
Collapse
|
11
|
Schewitz J, Roos R, van Aswegen H, Manda S. The effect of two passive head-down tilt positions on diaphragm excursion in healthy adults: A preliminary study. Physiother Theory Pract 2016; 32:223-31. [PMID: 27043164 DOI: 10.3109/09593985.2015.1137664] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
BACKGROUND AND PURPOSE A head-down tilt position could influence diaphragm excursion due to abdominal content displacement. The purpose of the study was to determine if excursion could be influenced by a head-down tilt position and if this change in excursion alters the diaphragm function. DESIGN Prospective quasi-experimental study. PARTICIPANTS Seventy healthy adult students. INTERVENTION Four head-down tilt positions: 1) 15° (30 seconds); 2) 15° (120 seconds); 3) 30° (30 seconds); and 4) 30° (120 seconds). OUTCOME MEASURES Change in diaphragm excursion was assessed using M-Mode ultrasound and diaphragm function was recorded in terms of the peak expiratory flow rate (PEFR) and thoracic expansion. Data were analyzed using descriptive statistics, Analysis of Variance (ANOVA), Kruskal Wallis and student's t-test. RESULTS The cohort consisted of 56 women (80%) and 14 men (20%) with a mean age of 20.7 (±1.7) years and a mean body mass index (BMI) of 23.0 (±3.7) kg/m(2). The greatest mean change in the hemi-diaphragm, for both genders measured from rest, was 38.8 (±11.5) mm on the left and 39.4 (±11.9) mm on the right. The greatest stretch occurred after a 30° head-down tilt for 30 seconds for both the right and left hemi-diaphragms in males and right hemi-diaphragm in females. The left hemi-diaphragm in females achieved its maximum stretch after 30° head-down tilt for 120 seconds. No significant changes in thoracic expansion or PEFR were observed but baseline values were less than predicted. CONCLUSION Optimal change in hemi-diaphragm excursion was obtained utilizing 30° head-down tilt positions in healthy subjects.
Collapse
Affiliation(s)
- Jacqui Schewitz
- a Department of Physiotherapy, School of Therapeutic Sciences, Faculty of Health Sciences , University of the Witwatersrand , Johannesburg , South Africa
| | - Ronel Roos
- a Department of Physiotherapy, School of Therapeutic Sciences, Faculty of Health Sciences , University of the Witwatersrand , Johannesburg , South Africa
| | - Heleen van Aswegen
- a Department of Physiotherapy, School of Therapeutic Sciences, Faculty of Health Sciences , University of the Witwatersrand , Johannesburg , South Africa
| | - Samuel Manda
- b Biostatistics Unit, South African Medical Research Council , Pretoria , South Africa
| |
Collapse
|
12
|
Ohya T, Hagiwara M, Suzuki Y. Inspiratory muscle warm-up has no impact on performance or locomotor muscle oxygenation during high-intensity intermittent sprint cycling exercise. SPRINGERPLUS 2015; 4:556. [PMID: 26435902 PMCID: PMC4586185 DOI: 10.1186/s40064-015-1355-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/17/2015] [Accepted: 09/20/2015] [Indexed: 12/03/2022]
Abstract
The purpose of this study was to investigate the effect of inspiratory muscle (IM) warm-up on performance and locomotor muscle oxygenation during high-intensity intermittent sprint cycling exercise. Ten subjects performed identical exercise tests (10 × 5 s with 25-s recovery on a cycle ergometer) after performing one of two different IM warm-up protocols. The IM warm-up consisted of two sets of 30 inspiratory efforts against a pressure-threshold load equivalent to 15 % (PLA) or 40 % (IMW) of maximal inspiratory pressure (MIP). MIP was measured with a portable autospirometer. Peak power and percent decrease in power were determined. Oxyhemoglobin (O2Hb) was measured using near-infrared spectroscopy. The MIP increased relative to baseline after IMW (115 ± 21 vs. 123 ± 17 cmH2O, P = 0.012, ES = 0.42), but not after PLA (115 ± 20 vs. 116 ± 17 cmH2O). Peak power (PLA: 10.0 ± 0.6 vs. IMW: 10.2 ± 0.5 W kg−1), percent decrease in power (PLA: 13.4 ± 5.6 vs. IMW: 13.2 ± 5.5 %), and changes in O2Hb levels (PLA: −10.8 ± 4.8 vs. −10.7 ± 4.1 μM) did not differ between the trials. IM function was improved by IMW. However, this did not enhance performance or locomotor muscle oxygenation during high-intensity intermittent sprint cycling exercise in untrained healthy males.
Collapse
Affiliation(s)
- Toshiyuki Ohya
- Department of Sports Science, Japan Institute of Sports Sciences, 3-15-1 Nishigaoka, Kita-ku, Tokyo, 115-0056 Japan
| | - Masahiro Hagiwara
- Department of Sports Science, Japan Institute of Sports Sciences, 3-15-1 Nishigaoka, Kita-ku, Tokyo, 115-0056 Japan
| | - Yasuhiro Suzuki
- Department of Sports Science, Japan Institute of Sports Sciences, 3-15-1 Nishigaoka, Kita-ku, Tokyo, 115-0056 Japan
| |
Collapse
|
13
|
Johnson MA, Gregson IR, Mills DE, Gonzalez JT, Sharpe GR. Inspiratory muscle warm-up does not improve cycling time-trial performance. Eur J Appl Physiol 2014; 114:1821-30. [PMID: 24878690 DOI: 10.1007/s00421-014-2914-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2014] [Accepted: 05/15/2014] [Indexed: 11/30/2022]
Abstract
PURPOSE This study examined the effects of an active cycling warm-up, with and without the addition of an inspiratory muscle warm-up (IMW), on 10-km cycling time-trial performance. METHODS Ten cyclists (VO₂ = 65 ± 9 mL kg(-1) min(-1)) performed a habituation 10-km cycling time-trial and three further time-trials preceded by either no warm-up (CONT), a cycling-specific warm-up (CYC) comprising three consecutive 5-min bouts at powers corresponding to 70, 80, and 90% of the gas exchange threshold, or a cycling-specific warm-up preceded by an IMW (CYC + IMW) comprising two sets of 30 inspiratory efforts against a pressure-threshold load of 40% maximal inspiratory pressure (MIP). The cycling warm-up was followed by 2-min rest before the start of the time-trial. RESULTS Time-trial performance times during CYC (14.75 ± 0.79 min) and CYC + IMW (14.70 ± 0.75 min) were not different, although both were faster than CONT (14.99 ± 0.90 min) (P < 0.05). Throughout the time-trial, physiological (minute ventilation, breathing pattern, pulmonary gas exchange, heart rate, blood lactate concentration and pH) and perceptual (limb discomfort and dyspnoea) responses were not different between CYC and CYC + IMW. Baseline MIP during CONT and CYC was 151 ± 31 and 156 ± 39 cmH₂O, respectively, and was unchanged following the time-trial. MIP increased by 8% after IMW (152 ± 27 vs. 164 ± 27 cmH2O, P < 0.05) and returned to baseline after the time-trial. CONCLUSIONS Improvements in 10-km cycling time-trial performance following an active cycling warm-up were not magnified by the addition of an IMW. Therefore, an appropriately designed active whole-body warm-up does adequately prepare the inspiratory muscles for cycling time-trials lasting approximately 15 min.
Collapse
Affiliation(s)
- M A Johnson
- Sport, Health and Performance Enhancement (SHAPE) Research Group, School of Science and Technology, Nottingham Trent University, Nottingham, NG11 8NS, UK,
| | | | | | | | | |
Collapse
|
14
|
Smith BK, Mathur S, Ye F, Martin AD, Truelson SA, Vandenborne K, Davenport PW. Intrinsic transient tracheal occlusion training and myogenic remodeling of rodent parasternal intercostal fibers. JOURNAL OF REHABILITATION RESEARCH AND DEVELOPMENT 2014; 51:841-854. [PMID: 25509059 PMCID: PMC4269303 DOI: 10.1682/jrrd.2012.12.0232] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
It is recognized that diaphragm muscle plasticity occurs with mechanical overloads, yet less is known about synergistic parasternal intercostal muscle fiber remodeling. We conducted overload training with intrinsic transient tracheal occlusion (ITTO) exercises in conscious animals. We hypothesized that ITTO would yield significant fiber hypertrophy and myogenic activation that would parallel diaphragm fiber remodeling. Sprague-Dawley rats underwent placement of a tracheal cuff and were randomly assigned to receive daily 10 min sessions of conscious ITTO or observation (sham) over 2 wk. After training, fiber morphology, myosin heavy chain (MHC) isoform composition, cross-sectional area, proportion of Pax7-positive nuclei, and presence of embryonic MHC (eMHC) were quantified. Type IIx/b fibers were 20% larger after ITTO training than with sham training (ITTO: 4,431 +/– 676 μm2, sham: 3,689 +/– 400 μm2, p < 0.05), and type I fibers were more prevalent after ITTO (p < 0.01). Expression of Pax7 was increased in ITTO parasternals and diaphragm (p < 0.05). In contrast, the proportion of eMHC-positive fibers was increased only in ITTO parasternals (1.2% [3.4%–0.6%], sham: 0% [0.6%–0%], p < 0.05). Although diaphragm and parasternal type II fibers hypertrophy to a similar degree, myogenic remodeling appears to differ between the two muscles.
Collapse
Affiliation(s)
- Barbara K. Smith
- Department of Physical Therapy, College of Public Health and Health Professions, University of Florida, Gainesville, Florida, USA
| | - Sunita Mathur
- Department of Physiotherapy, University of Toronto, Toronto, Ontario, Canada
| | - Fan Ye
- Department of Applied Physiology and Kinesiology, University of Florida, Gainesville, FL, USA
| | - A. Daniel Martin
- Department of Physical Therapy, College of Public Health and Health Professions, University of Florida, Gainesville, Florida, USA
| | | | - Krista Vandenborne
- Department of Physical Therapy, College of Public Health and Health Professions, University of Florida, Gainesville, Florida, USA
| | - Paul W. Davenport
- Department of Physiological Sciences, College of Veterinary Medicine, University of Florida, Gainesville, Florida, USA
| |
Collapse
|
15
|
Tomori Z, Donic V, Benacka R, Jakus J, Gresova S. Resuscitation and auto resuscitation by airway reflexes in animals. Cough 2013; 9:21. [PMID: 23968541 PMCID: PMC3828820 DOI: 10.1186/1745-9974-9-21] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2012] [Accepted: 08/19/2013] [Indexed: 11/19/2022] Open
Abstract
Various diseases often result in decompensation requiring resuscitation. In infants moderate hypoxia evokes a compensatory augmented breath - sigh and more severe hypoxia results in a solitary gasp. Progressive asphyxia provokes gasping respiration saving the healthy infant - autoresuscitation by gasping. A neonate with sudden infant death syndrome, however, usually will not survive. Our systematic research in animals indicated that airway reflexes have similar resuscitation potential as gasping respiration. Nasopharyngeal stimulation in cats and most mammals evokes the aspiration reflex, characterized by spasmodic inspiration followed by passive expiration. On the contrary, expiration reflex from the larynx, or cough reflex from the pharynx and lower airways manifest by a forced expiration, which in cough is preceded by deep inspiration. These reflexes of distinct character activate the brainstem rhythm generators for inspiration and expiration strongly, but differently. They secondarily modulate the control mechanisms of various vital functions of the organism. During severe asphyxia the progressive respiratory insufficiency may induce a life-threatening cardio-respiratory failure. The sniff- and gasp-like aspiration reflex and similar spasmodic inspirations, accompanied by strong sympatho-adrenergic activation, can interrupt a severe asphyxia and reverse the developing dangerous cardiovascular and vasomotor dysfunctions, threatening with imminent loss of consciousness and death. During progressive asphyxia the reversal of gradually developing bradycardia and excessive hypotension by airway reflexes starts with reflex tachycardia and vasoconstriction, resulting in prompt hypertensive reaction, followed by renewal of cortical activity and gradual normalization of breathing. A combination of the aspiration reflex supporting venous return and the expiration or cough reflex increasing the cerebral perfusion by strong expirations, provides a powerful resuscitation and autoresuscitation potential, proved in animal experiments. They represent a simple but unique model tested in animal experiments.
Collapse
Affiliation(s)
- Zoltan Tomori
- Department of Human Physiology Faculty of Medicine, University of PJ Safarik,
Kosice, Slovakia
| | - Viliam Donic
- Department of Human Physiology Faculty of Medicine, University of PJ Safarik,
Kosice, Slovakia
| | - Roman Benacka
- Department of Pathophysiology, Faculty of Medicine, University of PJ Safarik,
Kosice, Slovakia
| | - Jan Jakus
- Jessenius Faculty of Medicine in Martin, Comenius University, Bratislava,
Slovakia
| | - Sona Gresova
- Department of Human Physiology Faculty of Medicine, University of PJ Safarik,
Kosice, Slovakia
| |
Collapse
|
16
|
Cancelliero KM, Ike D, Sampaio LMM, Santos VLAD, Stirbulov R, Costa D. Estimulação diafragmática elétrica transcutânea (EDET) para fortalecimento muscular respiratório: estudo clínico controlado e randomizado. FISIOTERAPIA E PESQUISA 2012. [DOI: 10.1590/s1809-29502012000400002] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
O objetivo do estudo foi demonstrar o efeito de dois protocolos da estimulação diafragmática elétrica transcutânea (EDET) sobre a força muscular respiratória de mulheres saudáveis, sendo um protocolo segundo Geddes et al. (1988) e outro padronizado pelo equipamento Phrenics. Mulheres saudáveis foram divididas em 3 grupos: Controle (n=7); EDET com Phrenics (n=7) e EDET com Dualpex (n=7), sendo o tratamento realizado 2 vezes por semana, durante 6 semanas (12 sessões). Foram avaliadas a pressão inspiratória máxima (PImáx) e pressão expiratória máxima (PEmáx), antes e após o tratamento. A análise estatística foi realizada pelo teste Shapiro-Wilk e Kruskal Wallis com pós-hoc de Dunn (p<0,05). Os dois grupos experimentais apresentaram aumento na PImáx (Phrenics: 32,9%; Dualpex: 63,2%) e na PEmáx (Phrenics: 44,7%; Dualpex: 60,9%), diferentemente do Controle que não apresentou diferença. Em conclusão, os dois protocolos de EDET promoveram aumento da força muscular inspiratória e expiratória em mulheres saudáveis.
Collapse
Affiliation(s)
| | | | | | | | | | - Dirceu Costa
- Universidade Nove de Julho (UNINOVE), Brasil; UFSCar, Brasil
| |
Collapse
|
17
|
Hill K, Eastwood P. Effects of loading on upper airway and respiratory pump muscle motoneurons. Respir Physiol Neurobiol 2011; 179:64-70. [DOI: 10.1016/j.resp.2011.04.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2011] [Revised: 04/01/2011] [Accepted: 04/04/2011] [Indexed: 10/18/2022]
|
18
|
Lomax M, Grant I, Corbett J. Inspiratory muscle warm-up and inspiratory muscle training: Separate and combined effects on intermittent running to exhaustion. J Sports Sci 2011; 29:563-9. [DOI: 10.1080/02640414.2010.543911] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
19
|
Tong TK, Fu FH, Chung PK, Eston R, Lu K, Quach B, Nie J, So R. The effect of inspiratory muscle training on high-intensity, intermittent running performance to exhaustion. Appl Physiol Nutr Metab 2008; 33:671-81. [DOI: 10.1139/h08-050] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The effects of inspiratory muscle (IM) training on maximal 20 m shuttle run performance (Ex) during Yo-Yo intermittent recovery test and on the physiological and perceptual responses to the running test were examined. Thirty men were randomly allocated to 1 of 3 groups. The experimental group underwent a 6 week pressure threshold IM training program by performing 30 inspiratory efforts twice daily, 6 d/week, against a load equivalent to 50% maximal static inspiratory pressure. The placebo group performed the same training procedure but with a minimal inspiratory load. The control group received no training. In post-intervention assessments, IM function was enhanced by >30% in the experimental group. The Ex was improved by 16.3% ± 3.9%, while the rate of increase in intensity of breathlessness (RPB/4i) was reduced by 11.0% ± 6.2%. Further, the whole-body metabolic stress reflected by the accumulations of plasma ammonia, uric acid, and blood lactate during the Yo-Yo test at the same absolute intensity was attenuated. For the control and placebo groups, no significant change in these variables was observed. In comparison with previous observations that the reduced RPB/4i resulting from IM warm-up was the major reason for improved Ex, the reduced RPB/4i resulting from the IM training program was lower despite the greater enhancement of IM function, whereas improvement in Ex was similar. Such findings suggest that although both IM training and warm-up improve the tolerance of intense intermittent exercise, the underlying mechanisms may be different.
Collapse
Affiliation(s)
- Tom Kwokkeung Tong
- Dr. Stephen Hui Research Centre for Physical Recreation and Wellness, Hong Kong Baptist University, Hong Kong, China
- Department of Physical Education, Hong Kong Baptist University, Hong Kong, China
- School of Sport and Health Sciences, University of Exeter, Exeter, UK
- School of Physical Education and Sports, Macao Polytechnic Institute, Macao, China
- Sports Science Department, Hong Kong Sports Institute, Hong Kong, China
| | - Frank Hokin Fu
- Dr. Stephen Hui Research Centre for Physical Recreation and Wellness, Hong Kong Baptist University, Hong Kong, China
- Department of Physical Education, Hong Kong Baptist University, Hong Kong, China
- School of Sport and Health Sciences, University of Exeter, Exeter, UK
- School of Physical Education and Sports, Macao Polytechnic Institute, Macao, China
- Sports Science Department, Hong Kong Sports Institute, Hong Kong, China
| | - Pak Kwong Chung
- Dr. Stephen Hui Research Centre for Physical Recreation and Wellness, Hong Kong Baptist University, Hong Kong, China
- Department of Physical Education, Hong Kong Baptist University, Hong Kong, China
- School of Sport and Health Sciences, University of Exeter, Exeter, UK
- School of Physical Education and Sports, Macao Polytechnic Institute, Macao, China
- Sports Science Department, Hong Kong Sports Institute, Hong Kong, China
| | - Roger Eston
- Dr. Stephen Hui Research Centre for Physical Recreation and Wellness, Hong Kong Baptist University, Hong Kong, China
- Department of Physical Education, Hong Kong Baptist University, Hong Kong, China
- School of Sport and Health Sciences, University of Exeter, Exeter, UK
- School of Physical Education and Sports, Macao Polytechnic Institute, Macao, China
- Sports Science Department, Hong Kong Sports Institute, Hong Kong, China
| | - Kui Lu
- Dr. Stephen Hui Research Centre for Physical Recreation and Wellness, Hong Kong Baptist University, Hong Kong, China
- Department of Physical Education, Hong Kong Baptist University, Hong Kong, China
- School of Sport and Health Sciences, University of Exeter, Exeter, UK
- School of Physical Education and Sports, Macao Polytechnic Institute, Macao, China
- Sports Science Department, Hong Kong Sports Institute, Hong Kong, China
| | - Binh Quach
- Dr. Stephen Hui Research Centre for Physical Recreation and Wellness, Hong Kong Baptist University, Hong Kong, China
- Department of Physical Education, Hong Kong Baptist University, Hong Kong, China
- School of Sport and Health Sciences, University of Exeter, Exeter, UK
- School of Physical Education and Sports, Macao Polytechnic Institute, Macao, China
- Sports Science Department, Hong Kong Sports Institute, Hong Kong, China
| | - Jinlei Nie
- Dr. Stephen Hui Research Centre for Physical Recreation and Wellness, Hong Kong Baptist University, Hong Kong, China
- Department of Physical Education, Hong Kong Baptist University, Hong Kong, China
- School of Sport and Health Sciences, University of Exeter, Exeter, UK
- School of Physical Education and Sports, Macao Polytechnic Institute, Macao, China
- Sports Science Department, Hong Kong Sports Institute, Hong Kong, China
| | - Raymond So
- Dr. Stephen Hui Research Centre for Physical Recreation and Wellness, Hong Kong Baptist University, Hong Kong, China
- Department of Physical Education, Hong Kong Baptist University, Hong Kong, China
- School of Sport and Health Sciences, University of Exeter, Exeter, UK
- School of Physical Education and Sports, Macao Polytechnic Institute, Macao, China
- Sports Science Department, Hong Kong Sports Institute, Hong Kong, China
| |
Collapse
|
20
|
Independence of exercise-induced diaphragmatic fatigue from ventilatory demands. Respir Physiol Neurobiol 2008; 161:101-7; discussion 108-10. [DOI: 10.1016/j.resp.2007.11.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2007] [Revised: 11/10/2007] [Accepted: 11/16/2007] [Indexed: 11/21/2022]
|
21
|
Kabitz HJ, Walker D, Schwoerer A, Sonntag F, Walterspacher S, Roecker K, Windisch W. New physiological insights into exercise-induced diaphragmatic fatigue. Respir Physiol Neurobiol 2007; 158:88-96. [PMID: 17560177 DOI: 10.1016/j.resp.2007.04.011] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2007] [Revised: 04/26/2007] [Accepted: 04/26/2007] [Indexed: 11/24/2022]
Abstract
Data on the dynamic process and time-point of manifestation of exercise-induced diaphragmatic fatigue (DF) are lacking. Therefore, this study was aimed assessing dynamic changes of diaphragmatic strength during exercise and determining the time-point of DF manifestation. Fourteen trained subjects (maximal oxygen uptake (VO2(max)) 59.3+/-5.5 ml/min/kg) performed standardized exercise protocols (maximal workload: 85% VO2(max)) followed by recovery (6 min). Ergospirometric data and twitch transdiaphragmatic pressure (TwPdi) were consecutively assessed. DF was induced (TwPdi-rest: 2.34+/-0.26 versus TwPdi-end-recovery 2.01+/-0.21 kPa, p<0.01). TwPdi progressively increased during exercise (TwPdi-rest: 2.34+/-0.26 versus TwPdi-maximal-workload: 3.28+/-0.38 kPa, p<0.001). DF was detectable immediately after exercise-termination (TwPdi-maximal-workload: 3.28+/-0.38 versus TwPdi-early-recovery 2.55+/-0.34 kPa, p<0.001). TwPdi during exercise was highly correlated to workload, VO2(max) and dyspnea (r=0.96/r=0.92/r=0.97; all p<0.0001). In conclusion, diaphragmatic strength progressively increases with increasing workload, and DF manifests after - rather than during - exercise. In addition, TwPdi is highly correlated to key-measures of ergospirometry, approving the physiological thesis that muscle strength is progressively enhanced and escapes fatiguing failure during high-intensity exercise performance.
Collapse
Affiliation(s)
- Hans-Joachim Kabitz
- Department of Pneumology, University Hospital Freiburg, Killianstrasse 5, D-79106 Freiburg, Germany.
| | | | | | | | | | | | | |
Collapse
|