TY - JOUR T1 - Effects of prior self-control exertion on inspiratory muscle endurance, fatigue and dyspnoea JF - European Respiratory Journal JO - Eur Respir J DO - 10.1183/13993003.congress-2019.PA3928 VL - 54 IS - suppl 63 SP - PA3928 AU - Michael Johnson AU - Nathan Edgar AU - Graham Sharpe AU - Ruth Boat Y1 - 2019/09/28 UR - http://erj.ersjournals.com/content/54/suppl_63/PA3928.abstract N2 - Breathing effort is a sensation of exertional dyspnoea that mediates inspiratory muscle endurance. Exertion of self-control, defined as the process of volitionally controlling and overriding predominant habitual tendencies in order to achieve a specific goal, may exacerbate dyspnoea and reduce inspiratory muscle endurance. Seven healthy adults (age: 27±5 years) performed three incremental (10 cmH2O/min, starting at 10 cmH2O), inspiratory pressure-threshold loading (IPTL) tests (breathing frequency: 15 breaths/min; duty cycle: 0.5) until task failure. IPTL followed ~5-min of either seated rest (control: CON), an incongruent Stroop task (self-control exertion; SCE) or a congruent Stroop task (minimal self-control exertion; MSCE). Rating of perceived mental effort (Borg CR10 scale) was higher after the incongruent (5.0±2.2) than the congruent (2.8±2.5) Stroop task (P=0.02). IPTL duration and the maximum pressure-threshold sustained for 1-min was lower in SCE (8.84±1.18 min, 86±15 cmH2O) than CON (9.92±2.00 min, 96±18 cmH2O, P<0.05) and MSCE (10.31±1.60 min, 101±18 cmH2O, P<0.01). Maximum inspiratory mouth pressure was unchanged after IPTL (pooled data: -135±26 cmH2O). Potentiated twitch mouth pressure during cervical magnetic stimulation was -26±8 cmH2O at baseline and fell 14% after IPTL (main effect of time, P=0.02), but did not differ between trials. Rating of perceived breathing effort (Borg CR10 scale) during IPTL increased more rapidly in SCE (1.45±0.27 AU/10cmH2O) than CON (1.23±0.30 AU/10cmH2O, P=0.04) and MSCE (1.20±0.23 AU/10cmH2O, P=0.02). In conclusion, self-control exertion increases the perception of exertional dyspnoea and reduces inspiratory muscle endurance.FootnotesCite this article as: European Respiratory Journal 2019; 54: Suppl. 63, PA3928.This is an ERS International Congress abstract. No full-text version is available. Further material to accompany this abstract may be available at www.ers-education.org (ERS member access only). ER -