Key result
High-resistance inspiratory muscle strength training extends respiratory endurance by ~83% in healthy young adults.
Why the study?
The effects of a short course of high-resistance, low-volume inspiratory muscle strength training on respiratory endurance and cardiovascular responsiveness to high respiratory workloads in healthy young adults were not well characterized.
Does 6-weeks high-resistance, low-volume inspiratory muscle strength training improve respiratory endurance and blunt cardiovascular responsiveness in healthy young adults?
Does 6-weeks high-resistance, low-volume inspiratory muscle strength training improve respiratory endurance and blunt cardiovascular responsiveness in healthy young adults?
Absolute Event Rate: 663.8% vs 362%
p-value: p=0.003
A 6-week course of high-resistance, low-volume inspiratory muscle strength training improves respiratory endurance and lowers resting blood pressure in healthy young adults.
May improve respiratory endurance in healthy young adults; leaves open effects on cardiovascular responses or clinical populations.
Our objective was to evaluate the effects of 6-weeks high-resistance, low-volume inspiratory muscle strength training (IMST) on respiratory endurance, blood pressure (BP) and heart rate (HR) responsiveness to high respiratory workloads. Ten healthy young adults completed two constant-load resistive breathing tests to exhaustion (Tlim) (target pressure =65 % maximal inspiratory pressure [PImax]; duty cycle = 0.7; breathing frequency matched to eupnea) separated by 6-weeks high-resistance (75 % maximal inspiratory pressure, PImax), low-volume (30 inspiratory efforts/day, 5 days/week) IMST. Throughout resistive breathing trials we measured beat-to-beat changes in BP and HR, mouth pressure, inspiratory muscle work and perceived exertion. POST resistive breathing tests revealed significant gains in endurance (PRE: 362.0 ± 46.6 s vs. POST: 663.8 ± 110.3 s, p = 0.003) and increases in respiratory muscle work (PRE: −9445 ± 1562 mmHg.s vs. POST: −16648 ± 3761 mmHg.s, p = 0.069). Conversely, systolic and diastolic BP responses, HR and ratings of perceived exertion all declined. Consistent with previous observations, 6 weeks high resistance, low volume IMST lowered casual resting SBP (p = 0.002), DBP (p = 0.007) and mean arterial pressure (p = 0.001) and improved static inspiratory pressure. High resistance, low volume inspiratory muscle strength training extends respiratory endurance and attenuates BP responsiveness in healthy, recreationally-active young adults. The outcomes have implications for improved athletic performance and for attaining and/or maintaining cardiorespiratory fitness.
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DeLucia et al. (2022) studied Healthy young adults (n=10). High-resistance, low-volume inspiratory muscle strength training (IMST) vs. Pre-training baseline was evaluated on Respiratory endurance (time to exhaustion) (p=0.003). Six weeks of high-resistance, low-volume inspiratory muscle strength training significantly extended respiratory endurance from 362.0 to 663.8 seconds (p=0.003) in healthy young adults.
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