Impact of body posture on pulmonary diffusing capacity at rest and during exercise in endurance-trained and untrained individuals.

IF 3.3 3区 医学 Q1 PHYSIOLOGY
Journal of applied physiology Pub Date : 2025-01-01 Epub Date: 2024-12-16 DOI:10.1152/japplphysiol.00447.2024
Andrew R Brotto, Stephanie de Waal, Andrew W D'Souza, Rhys I Beaudry, Cameron M Ehnes, Sophie É Collins, Desi P Fuhr, Sean van Diepen, Michael K Stickland
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Abstract

Endurance-trained athletes exhibit a greater diffusing capacity for carbon monoxide (DLCO) at rest and during exercise as compared with untrained individuals; however, the mechanism(s) are unclear. The supine position translocates blood centrally and can be used to investigate DLCO responses independent of metabolic rate. We hypothesized that endurance-trained individuals would have a greater DLCO response to postural change at rest as compared with untrained and that the supine position would elicit a greater DLCO response as compared with the upright position during exercise in both groups. Fourteen endurance-trained (Trained) individuals (V̇o2peak: 61.1 ± 4.4 mL·kg-1·min-1) and 14 untrained individuals (V̇o2peak: 37.4 ± 3.0 mL·kg-1·min-1) completed DLCO maneuvers at rest and during exercise in the upright and supine position. At rest, there was a significant group-by-position interaction (P = 0.02) effect on DLCO with post hoc analysis determining DLCO increased from upright to supine position in Trained (P < 0.01), but not untrained (P = 0.58). There was no effect of position on exercising DLCO (P = 0.16) regardless of group; however, pulmonary capillary blood volume (VC) was increased with supine exercise (P = 0.03). There was an apparent plateau in DLCO and VC in the Trained group near-maximal exercise as Trained failed to increase DLCO (P = 0.25) and Vc (P = 0.46) up to near-maximal exercise. Trained individuals demonstrate greater DLCO recruitment with postural change at rest suggesting a greater ability to recruit/distend the pulmonary microvasculature. However, the supine position did not augment DLCO as compared with upright position in Trained individuals near-maximal exercise, suggesting a plateau may be reached at maximal exercise.NEW & NOTEWORTHY We demonstrate that the supine position increases resting DLCO significantly more in endurance-trained individuals as compared with untrained individuals. Furthermore, the supine position increases pulmonary capillary blood volume, but not diffusing capacity during exercise. Lastly, there was an apparent plateau in DLCO and VC in the Trained group suggesting the pulmonary microvasculature may reach a morphological limit.

身体姿势对耐力训练和未训练个体休息和运动时肺弥散能力的影响。
耐力训练的运动员在休息和运动中表现出更大的一氧化碳(DLCO)扩散能力;然而,其机制尚不清楚。仰卧位是血液的中心转运,可以用来研究与代谢率无关的DLCO反应。我们假设耐力训练的个体在休息时比未训练的个体对姿势变化有更大的DLCO反应,并且在两组中,仰卧姿势比直立姿势会引起更大的DLCO反应。14名耐力训练组(训练组)和14名非训练组(训练组)分别在休息时和运动时分别以直立和仰卧位完成DLCO动作(V氧峰值:61.1±4.4 ml∙kg-1∙min-1)和37.4±3.0 ml∙kg-1∙min-1。在休息时,DLCO有显著的组位交互作用(p=0.02),事后分析确定训练(pC)的DLCO从直立到仰卧位增加,仰卧位运动增加(p=0.03)。训练组在接近最大运动时DLCO和VC有一个明显的平台,因为训练组在接近最大运动时DLCO (p=0.25)和VC (p=0.46)没有增加。训练有素的个体在休息时体位改变时DLCO增加,表明其肺微血管增加/扩张的能力更强。然而,在接近最大运动的训练个体中,与直立位置相比,仰卧位并没有增加DLCO,这表明在最大运动时可能会达到平台期。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
6.00
自引率
9.10%
发文量
296
审稿时长
2-4 weeks
期刊介绍: The Journal of Applied Physiology publishes the highest quality original research and reviews that examine novel adaptive and integrative physiological mechanisms in humans and animals that advance the field. The journal encourages the submission of manuscripts that examine the acute and adaptive responses of various organs, tissues, cells and/or molecular pathways to environmental, physiological and/or pathophysiological stressors. As an applied physiology journal, topics of interest are not limited to a particular organ system. The journal, therefore, considers a wide array of integrative and translational research topics examining the mechanisms involved in disease processes and mitigation strategies, as well as the promotion of health and well-being throughout the lifespan. Priority is given to manuscripts that provide mechanistic insight deemed to exert an impact on the field.
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