Bradley M E, Leith D E
J Appl Physiol Respir Environ Exerc Physiol. 1978 Dec;45(6):885-92. doi: 10.1152/jappl.1978.45.6.885.
We measured the oxygen cost of breathing during sustained voluntary normocarbic hyperpnea in 12 subjects (4 endurance trainers, 4 strength trainers, and 4 controls) before and after a 5-wk training program limited to the ventilatory muscles (Leith, D. E., and M. E. Bradley. J. Appl. Physiol. 41: 508-516, 1976). "Steady-state" measurements of oxygen consumption were made at pulmonary ventilations ranging from 103 to 250 l/min. There were marked differences in the relationship between the metabolic cost of breathing and pulmonary ventilations between subjects. Spontaneously chosen respiratory frequencies ranged from 80 to 120 breaths/min and varied widely, even in a given subject, suggesting that the optima for frequency are broad or that optimization was imperfect. The subject group who performed endurance training increased by 19% the level of hyperpnea that they could sustain for 7--15 min, and increased their oxygen consumptions during this hyperpnea by an average of 67%. Following a 15-wk period of detraining, endurance trainers had lost 50% of their gains in the ventilations that they could sustain and in the accompanying oxygen consumptions. We conclude that ventilatory muscle endurance training can appreciably increase the aerobic endurance of the respiratory muscles.
我们在12名受试者（4名耐力训练者、4名力量训练者和4名对照组人员）中，于一项为期5周、仅限于呼吸肌的训练计划前后，测量了持续性自主正常碳酸血症性深呼吸期间的呼吸氧耗（Leith, D. E., and M. E. Bradley. J. Appl. Physiol. 41: 508 - 516, 1976）。在肺通气量为103至250升/分钟范围内进行了耗氧量的“稳态”测量。受试者之间呼吸的代谢成本与肺通气量之间的关系存在显著差异。自发选择的呼吸频率范围为80至120次/分钟，且变化很大，即使在同一受试者中也是如此，这表明频率的最佳值范围较宽，或者优化并不完美。进行耐力训练的受试者组能够持续7至15分钟的深呼吸水平提高了19%，并且在此深呼吸期间他们的耗氧量平均增加了67%。经过15周的停训期后，耐力训练者在能够维持的通气量及相应耗氧量方面损失了50%的训练成果。我们得出结论，呼吸肌耐力训练可显著提高呼吸肌的有氧耐力。
