Love R G, Muir D C, Sweetland K F, Bentley R A, Griffin O G
Br J Ind Med. 1977 May;34(2):126-9. doi: 10.1136/oem.34.2.126.
Tolerance of additional external resistance to inspiration has been investigated in a group of coalworkers older than 45 years. Peak inspiratory pressure, external respiratory work rate, ventilation, and gas exchange were measured, during periods with and without one of four inspiratory resistances, on 41 subjects walking on a treadmill. Minute volume was reduced, breathing frequency was unchanged and oxygen uptake and carbon dioxide elimination were reduced by the presence of resistance. It was established that, at the workload studied, older men were able to tolerate inspiratory resistance to at least the same extent as younger men, when the respiratory work was expressed in terms of unit ventilation. It is suggested that the acceptable level of breathing resistance established for younger men can also be applied to older workers.
对一组年龄超过45岁的煤矿工人进行了额外吸气外部阻力耐受性的研究。在41名在跑步机上行走的受试者中，分别在有和没有四种吸气阻力之一的期间，测量了吸气峰值压力、外部呼吸功速率、通气量和气体交换。阻力的存在使分钟通气量减少，呼吸频率不变，氧气摄取和二氧化碳排出减少。结果表明，在所研究的工作负荷下，当以单位通气量来表示呼吸功时，老年男性对吸气阻力的耐受程度至少与年轻男性相同。建议为年轻男性确定的可接受呼吸阻力水平也可应用于老年工人。
