Respiratory muscle performance with stretch‐shortening cycle manoeuvres: maximal inspiratory pressure–flow curves

Abstract

The maximal inspiratory pressure-flow capacity can be enhanced with SSC manoeuvres in a manner analogous to increases in the force-velocity relationship with SSC reported for skeletal muscles.

Mechanical Properties of Respiratory Muscles

“…This principle, first defined in limb muscles, was later demonstrated for human inspiratory muscles by Topulos, et al (436) who showed that healthy volunteers develop higher mouth pressures during maximum plyometric maneuvers than during maximum static efforts against an occluded airway. More recently, Tzelepis and associates (444) reported that plyometric contractions performed immediately before an inspiratory effort can augment maximum inspiratory power, mimicking limb muscle performance in a stretch-shortening cycle (50). …”

Hemodynamic effects of portable non-invasive ventilation in healthy men

“…The stretch-shortening cycle is a well-accepted property of the muscular function by which the skeletal muscles can increase their power output [Bosco and Komi 1979,Cronin, et al 2001,Komi 2000,Takarada, et al 1997,Walshe, et al 1998] and is another potential mechanism that can explain the greater work of breathing. The respiratory muscles can similarly increase their power output with manoeuvers in which respiratory muscle contraction is immediately preceded by an eccentric contraction of the respiratory muscles [Tzelepis, et al 2005]. In our study, the high IPAP increased end-inspiratory chest wall volume when our participants breathed through the VitaBreath device.…”

Inter-session reproducibility of peak expiratory flow with standardized expiratory maneuvers

“…9,27 With pauses of about 4-6 s at TLC, the decreases in PEF may range from 6 to 13% in the healthy volunteers. 5,7,23 The decrement in PEF appears to be greater when the preceding inspiration is slow. In certain patients, particularly COPD or cystic fibrosis, the difference in PEF and other spirometric parameters can be much greater, probably reflecting the time-constant inequalities within the lungs.…”

“…The transition from an eccentric to a concentric contraction can augment respiratory muscle force output in a manner similar to that described in peripheral muscles. 6,[22][23][24][25] In contrast, a breath-hold at TLC neutralizes the effect of fast inspiration on the effective elastic recoil pressure; it allows stress relaxation in both the airway wall and lung parenchyma to occur and thus increases the airway compliance and decreases the effective lung elastic recoil pressure. 5,8,26 Long post-inspiratory pauses at TLC may also offset the augmentation of expiratory muscle force related to stretchshorten cycle.…”