scholarly journals Sex differences in diaphragmatic fatigue and the metaboreflex following inspiratory pressure-threshold loading

2018 ◽  
Vol 596 (19) ◽  
pp. 4579-4580
Author(s):  
Christina D. Bruce ◽  
Alexandra F. Yacyshyn ◽  
Luca Ruggiero
Keyword(s):  
Sex Differences ◽  
Inspiratory Pressure ◽  
Pressure Threshold ◽  
Diaphragmatic Fatigue

scholarly journals No Sex Differences In Diaphragmatic Fatigue When Matched For Absolute Force During Inspiratory Pressure-threshold Loading

2019 ◽  
Vol 51 (Supplement) ◽  
pp. 16
Author(s):  
Caitlin M. Geary ◽  
Joseph F. Welch ◽  
Malcolm R. McDonald ◽  
Carli M. Peters ◽  
Paige A. Reinhard ◽  
...  
Keyword(s):  
Sex Differences ◽  
Inspiratory Pressure ◽  
Pressure Threshold ◽  
Diaphragmatic Fatigue

Specific inspiratory muscle warm-up enhances badminton footwork performance

2007 ◽  
Vol 32 (6) ◽  
pp. 1082-1088 ◽  
Author(s):  
Hua Lin ◽  
Tom Kwokkeung Tong ◽  
Chuanye Huang ◽  
Jinlei Nie ◽  
Kui Lu ◽  
...  
Keyword(s):  
Random Order ◽  
Inspiratory Muscle ◽  
Inspiratory Pressure ◽  
Test Duration ◽  
Warm Up ◽  
Pressure Threshold ◽  
Mouth Pressure ◽  
Concomitant Reduction ◽  
Experimental Trials ◽  
Relationship Of

The effects of inspiratory muscle (IM) warm-up on IM function and on the maximum distance covered in a subsequent incremental badminton-footwork test (FWmax) were examined. Ten male badminton players were recruited to perform identical tests in three different trials in a random order. The control trial did not involve an IM warm-up, whereas the placebo and experimental trials did involve an IM warm-up consisting of two sets of 30-breath manoeuvres with an inspiratory pressure-threshold load equivalent to 15% (PLA) and 40% (IMW) maximum inspiratory mouth pressure, respectively. In the IMW trial, IM function was improved with 7.8% ± 4.0% and 6.9% ± 3.5% increases from control found in maximal inspiratory pressure at zero flow (P0) and maximal rate of P0 development (MRPD), respectively (p < 0.05). FWmax was enhanced 6.8% ± 3.7%, whereas the slope of the linear relationship of the increase in the rating of perceived breathlessness for every minute (RPB/min) was reduced (p < 0.05). Reduction in blood lactate ([La–]b) accumulation was observed when the test duration was identical to that of the control trial (P < 0.05). In the PLA trial, no parameter was changed from control. For the changes (Δ) in parameters in IMW (n = 10), negative correlations were found between ΔP0 and ΔRPB/min (r2 = 0.58), ΔMRPD and ΔRPB/min (r2 = 0.48), ΔRPB/min, and ΔFWmax (r2 = 0.55), but not between Δ[La–]b accumulation and ΔFWmax. Such findings suggest that the IM-specific warm-up improved footwork performance in the subsequent maximum incremental badminton-footwork test. The improved footwork was partly attributable to the reduced breathless sensation resulting from the enhanced IM function, whereas the contribution of the concomitant reduction in [La–]b accumulation was relatively minor.

scholarly journals Non-Invasive Assessment of Inspiratory Ribcage Muscle Fatigue and Recovery During Two Endurance Tests in Healthy Individuals

2021 ◽  
Author(s):  
Thiago Bezerra Wanderley e Lima ◽  
Antonio Sarmento ◽  
Rayane Grayce Silva Vieira ◽  
Esmívany Lhara Freitas Castro ◽  
Francesca Pennati ◽  
...  
Keyword(s):  
Tissue Oxygenation ◽  
Linear Increase ◽  
Inspiratory Pressure ◽  
Median Frequency ◽  
Endurance Test ◽  
Shortening Velocity ◽  
Non Invasive ◽  
Optoelectronic Plethysmography ◽  
Pressure Threshold ◽  
Endurance Tests

Abstract Introduction: Fatigue is defined as a loss in the capacity for developing force and/or velocity of a muscle which is reversible by rest. The aim was to evaluate non-invasively the fatigue and recovery of the inspiratory ribcage muscles during two endurance tests in healthy subjects. Methods: 22 subjects were evaluated before, during and after performing a respiratory endurance test with normocapnic hyperpnea (NH) and inspiratory pressure threshold load (IPTL). Simultaneous measurements of muscle activity (electromyography), tissue oxygenation (NIRS), pressure (nasal inspiratory pressure), and volume (optoelectronic plethysmography) were performed. Results: There was a decrease in the maximum relaxation rate (MRR) and increase in the time constant (τ) after the IPTL test (p <0.05) and a decrease in the peak pressure generated in SNIP after both protocols (p <0.05). Additionally, there was a decrease in shortening velocity and mechanical power only after the IPTL test (p <0.05). The inspiratory ribcage muscles showed a linear drop in the median frequency in the IPTL test and an exponential drop in the NH test, which was not significant for the development of fatigue and there was a linear increase in the NIRS variables in both protocols. Conclusion: It was concluded that the inspiratory ribcage muscles undergo changes after performing an endurance test with NH and IPTL. Additionally, the development of fatigue in these muscles and their consequent changes are more evident in the protocol with IPTL.

scholarly journals Sex Differences In Exercise-induced Diaphragmatic Fatigue In Endurance-trained Athletes

2010 ◽  
Author(s):  
Jordan A. Guenette ◽  
Lee M. Romer ◽  
Jordan S. Querido ◽  
Romeo Chua ◽  
Neil D. Eves ◽  
...  
Keyword(s):  
Sex Differences ◽  
Diaphragmatic Fatigue ◽  
Exercise Induced

scholarly journals Effect of diaphragm fatigue on subsequent exercise tolerance in healthy men and women

2018 ◽  
Vol 125 (6) ◽  
pp. 1987-1996 ◽  
Author(s):  
Joseph F. Welch ◽  
Bruno Archiza ◽  
Jordan A. Guenette ◽  
Christopher R. West ◽  
A. William Sheel
Keyword(s):  
Exercise Test ◽  
Exercise Tolerance ◽  
Inspiratory Muscle ◽  
Whole Body ◽  
Time To Exhaustion ◽  
Men And Women ◽  
Muscle Metaboreflex ◽  
Healthy Men ◽  
Pressure Threshold ◽  
Diaphragmatic Fatigue

Women are more resistant to diaphragmatic fatigue (DF) and experience an attenuated inspiratory muscle metaboreflex relative to men. The effects of such sex-based differences on whole body exercise tolerance are yet to be examined. It was hypothesized that DF induced prior to exercise would cause less of a reduction in subsequent exercise time in women compared to men. Healthy men ( n = 9, age = 24 ± 3 yr) and women ( n = 9, age = 24 ± 3 yr) completed a maximal incremental cycle test on day 1. On day 2, subjects performed isocapnic inspiratory pressure-threshold loading (PTL) to task failure followed by a constant load submaximal time-to-exhaustion (TTE) exercise test at 85% of the predetermined peak work rate. On day 3, subjects performed the same exercise test without prior induced DF. Days 2 and 3 were randomized and counterbalanced. Magnetic stimulation of the phrenic nerve roots was used to nonvolitionally assess DF by measurement of transdiaphragmatic twitch pressure ( Pdi,tw). A similar degree of DF was produced in both sexes following PTL [ Pdi,tw (% change from baseline): M = −24.6 ± 7.8%, W = −23.1 ± 5.4%; P = 0.54)]. There was a significant reduction in TTE with prior induced DF compared with the control condition in both men (10.9 ± 3.5 min vs. 13.0 ± 3.2 min, P = 0.05) and women (10.1 ± 2.4 min vs. 12.2 ± 3.3 min, P = 0.03) that did not differ in magnitude between the sexes (M = −15.8 ± 19.5%, W = −14.5 ± 19.2%, P = 0.89). In conclusion, DF negatively and equally impairs exercise tolerance independent of sex. NEW & NOTEWORTHY Women are more resistant to diaphragmatic fatigue (DF) relative to men. The effect of DF on exercise tolerance is currently being debated. Our findings show that DF negatively and equally affects exercise tolerance in healthy men and women. Mechanisms beyond the inspiratory muscle metaboreflex (e.g., dyspnea, central fatigue, breathing pattern) may explain the absence of a sex-based difference.

Men Exhibit Greater Pain Pressure Thresholds and Times to Task Failure but Not Performance Fatigability Following Self-Paced Exercise

2021 ◽  
pp. 003151252110350
Author(s):  
Karina Noboa ◽  
Joshua Keller ◽  
Kipp Hergenrader ◽  
Terry Housh ◽  
John Paul Anders ◽  
...  
Keyword(s):  
Sex Differences ◽  
Perceived Exertion ◽  
Rating Of Perceived Exertion ◽  
Muscle Size ◽  
Maximal Voluntary Isometric Contraction ◽  
Cross Sectional ◽  
Task Failure ◽  
Leg Extension ◽  
Pressure Threshold ◽  
Pain Pressure Threshold

The purpose of the current study was to determine if, and to what extent, sex differences in performance fatigability after a sustained, bilateral leg extension, anchored to a moderate rating of perceived exertion (RPE), could be attributed to muscle size, muscular strength, or pain pressure threshold (PPT) in young, healthy adults. Thirty adults (men: n = 15, women: n = 15) volunteered to complete a sustained leg extension task anchored to RPE = 5 (10-point OMNI scale) as well as pretest and posttest maximal voluntary isometric contraction (MVIC) trials. The fatigue-induced decline in MVIC force was defined as performance fatigability. We used muscle cross-sectional area (mCSA) to quantify muscle size and a dolorimeter to assess PPT. The sustained task induced fatigue such that both men and women exhibited significant ( p < 0.05) decreases in MVIC force from pretest to posttest ( M = 113.3, SD =24.2 kg vs. M = 98.3, SD = 23.1 kg and M = 73.1, SD =14.5 kg vs. M = 64.1, SD = 16.2 kg, respectively), with no significant sex differences in performance fatigability (grand M = 12.6, SD =10.6%). Men, however, exhibited significantly ( p < 0.05) longer time to task failure (TTF) than women ( M = 166.1, SD =83.0 seconds vs. M = 94.6, SD =41.7) as well as greater PPT ( M = 5.9, SD = 2.2 kg vs. M = 3.4, SD =1.1 kg). The only significant predictor of performance fatigability was PPT. In conclusion, differences in PPT, at least in part, mediate variations in TTF during self-paced exercise anchored to a specific RPE and resulting in performance fatigability.

Inspiratory pressure threshold training for upper airway limitation: a case of bilateral abductor vocal fold paralysis

2003 ◽  
Vol 17 (3) ◽  
pp. 384-394 ◽  
Author(s):  
Susan E Baker ◽  
Christine M Sapienza ◽  
Danny Martin ◽  
Paul Davenport ◽  
Bari Hoffman-Ruddy ◽  
...  
Keyword(s):  
Vocal Fold ◽  
Upper Airway ◽  
Vocal Fold Paralysis ◽  
Inspiratory Pressure ◽  
Pressure Threshold

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.

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