Respiratory muscle training (RMT) by means of eucapnic hyperpnoea (Spirotiger®, Zurich, CH) is reported to increase exercise endurance but information on the effect of RMT on respiratory pattern and work efficiency during incremental exercise is lacking. Aim: to test the effect of RMT with Spirotiger on ventilatory pattern and aerobic function during incremental exercise in healthy subjects. Methods: 6 males collegiate athletes (age 20-24 years) involved in different disciplines such as soccer (2), rowing (1), triathlon (1), road skating (2) were recruited to partecipate in the study. A cardiopulmonary incremental test on a treadmill using a Balke protocol was performed by each subject before and after the RMT. VO2max, anaerobic threshold (AT) and the ΔVO2/ΔWR were determined. During the test ventilation and breathing pattern were evaluated by means of a portable inductive plethysmography (Lifeshirt, Vivometric, CA) and an index of thoracoabdominal coordination (the phase angle, Θ°) was calculated. RMT consisted of bouts of 20 min/day, 5 times/week, at Tidal Volume (Vt) = 60% of Vital Capacity (VC), respiratory frequency (ƒ) from 28 (first week) to 36. The remaining training schedule was unchanged. Results: after 4 weeks of RMT no changes were observed in VE, Vt, ƒ,VO2max, AT; Θ° at submaximal and maximal exercise significantly decreased from 24.2 (1.3) to 9.6 (0.5) p <0.001; ΔVO2/ΔW ml O2/W/min significantly decreased from 10.52 (.002) to 9.12 (.009), p =0.04. We conclude that 4 weeks RMT significantly improves thoracoabdominal coordination and work efficiency in healthy subjects during incremental exercise test.
Respiratory muscle training improves thoracoabdominal coordination and work efficiency during incremental exercise in healthy subjects
POMIDORI, Luca;ULIARI, Simone;MAZZONI, Gianni;MANFREDINI, Fabio;GRAZZI, Giovanni;COGO, Annaluisa
2008
Abstract
Respiratory muscle training (RMT) by means of eucapnic hyperpnoea (Spirotiger®, Zurich, CH) is reported to increase exercise endurance but information on the effect of RMT on respiratory pattern and work efficiency during incremental exercise is lacking. Aim: to test the effect of RMT with Spirotiger on ventilatory pattern and aerobic function during incremental exercise in healthy subjects. Methods: 6 males collegiate athletes (age 20-24 years) involved in different disciplines such as soccer (2), rowing (1), triathlon (1), road skating (2) were recruited to partecipate in the study. A cardiopulmonary incremental test on a treadmill using a Balke protocol was performed by each subject before and after the RMT. VO2max, anaerobic threshold (AT) and the ΔVO2/ΔWR were determined. During the test ventilation and breathing pattern were evaluated by means of a portable inductive plethysmography (Lifeshirt, Vivometric, CA) and an index of thoracoabdominal coordination (the phase angle, Θ°) was calculated. RMT consisted of bouts of 20 min/day, 5 times/week, at Tidal Volume (Vt) = 60% of Vital Capacity (VC), respiratory frequency (ƒ) from 28 (first week) to 36. The remaining training schedule was unchanged. Results: after 4 weeks of RMT no changes were observed in VE, Vt, ƒ,VO2max, AT; Θ° at submaximal and maximal exercise significantly decreased from 24.2 (1.3) to 9.6 (0.5) p <0.001; ΔVO2/ΔW ml O2/W/min significantly decreased from 10.52 (.002) to 9.12 (.009), p =0.04. We conclude that 4 weeks RMT significantly improves thoracoabdominal coordination and work efficiency in healthy subjects during incremental exercise test.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
