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在 Q̇-V̇O2 初始值较低的年轻健康男性中，4 周的冲刺间歇训练可使亚最大运动心输出量增加：心脏反应表型的重要性。

Submaximal exercise cardiac output is increased by 4 weeks of sprint interval training in young healthy males with low initial Q̇-V̇O2: Importance of cardiac response phenotype.

机构信息

School of Kinesiology and Health Studies, Human Vascular Control Laboratory, Queen's University, Kingston, ON, Canada.

Department of Medicine, Division of Respirology, Laboratory of Clinical Exercise Physiology, Queen's University, Kingston, ON, Canada.

出版信息

PLoS One. 2019 Jan 23;14(1):e0195458. doi: 10.1371/journal.pone.0195458. eCollection 2019.

DOI:10.1371/journal.pone.0195458
PMID:30673702
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6343875/
Abstract

Cardiovascular adaptations to exercise, particularly at the individual level, remain poorly understood. Previous group level research suggests the relationship between cardiac output and oxygen consumption ([Formula: see text]-[Formula: see text]) is unaffected by training as submaximal [Formula: see text] is unchanged. We recently identified substantial inter-individual variation in the exercise [Formula: see text]-[Formula: see text] relationship that was correlated to stroke volume (SV) as opposed to arterial oxygen content. Therefore we explored the effects of sprint interval training (SIT) on modulating [Formula: see text]-[Formula: see text] given an individual's specific [Formula: see text]-[Formula: see text] relationship. 22 (21±2 yrs) healthy, recreationally active males participated in a 4-week SIT (8, 20 second sprints; 4x/week, 170% of the work rate at [Formula: see text] peak) study with progressive exercise tests (PET) until exhaustion. Cardiac output ([Formula: see text] L/min; inert gas rebreathe, Finometer Modelflow™), oxygen consumption ([Formula: see text] L/min; breath-by-breath pulmonary gas exchange), quadriceps oxygenation (near infrared spectroscopy) and exercise tolerance (6-20; Borg Scale RPE) were measured throughout PET both before and after training. Data are mean Δ from bsl±SD. Higher [Formula: see text] ([Formula: see text]) and lower [Formula: see text] ([Formula: see text]) responders were identified post hoc (n = 8/group). SIT increased the [Formula: see text]-[Formula: see text] post-training in [Formula: see text] (3.8±0.2 vs. 4.7±0.2; P = 0.02) while [Formula: see text] was unaffected (5.8±0.1 vs. 5.3±0.6; P = 0.5). [Formula: see text] was elevated beyond 80 watts in [Formula: see text] due to a greater increase in SV (all P<0.04). Peak [Formula: see text] (ml/kg/min) was increased in [Formula: see text] (39.7±6.7 vs. 44.5±7.3; P = 0.015) and [Formula: see text] (47.2±4.4 vs. 52.4±6.0; P = 0.009) following SIT, with [Formula: see text] having a greater peak [Formula: see text] both pre (P = 0.02) and post (P = 0.03) training. Quadriceps muscle oxygenation and RPE were not different between groups (all P>0.1). In contrast to [Formula: see text], [Formula: see text] responders are capable of improving submaximal [Formula: see text]-[Formula: see text] in response to SIT via increased SV. However, the increased submaximal exercise [Formula: see text] does not benefit exercising muscle oxygenation.

摘要

运动对心血管的适应性，特别是在个体水平上，仍知之甚少。以前的群体水平研究表明，心输出量和耗氧量([Formula: see text]-[Formula: see text])之间的关系不受训练的影响，因为亚最大[Formula: see text]不变。我们最近发现，在运动[Formula: see text]-[Formula: see text]关系中存在很大的个体间差异，这种差异与每搏量(SV)相关，而与动脉氧含量无关。因此，我们研究了短跑间歇训练(SIT)对调节[Formula: see text]-[Formula: see text]的影响，考虑到个体的特定[Formula: see text]-[Formula: see text]关系。22 名(21±2 岁)健康、有规律运动的男性参加了一项为期 4 周的 SIT(8 个、20 秒冲刺；每周 4 次，[Formula: see text]峰值的 170%)研究，并进行了渐进性运动测试(PET)，直到力竭。心输出量([Formula: see text] L/min；惰性气体再呼吸，Finometer Modelflow™)、耗氧量([Formula: see text] L/min；逐口气肺气体交换)、股四头肌氧合(近红外光谱)和运动耐量(6-20；Borg 量表 RPE)在训练前后的 PET 过程中均进行测量。数据是 bsl 的平均 Δ±SD。根据[Formula: see text]([Formula: see text])和[Formula: see text]([Formula: see text])反应者(post hoc)定义，训练前后[Formula: see text]-[Formula: see text]的[Formula: see text]和[Formula: see text]均增加(post hoc)(n = 8/组)。SIT 增加了[Formula: see text]-[Formula: see text]训练后的[Formula: see text](3.8±0.2 对 4.7±0.2；P = 0.02)，而[Formula: see text]没有影响(5.8±0.1 对 5.3±0.6；P = 0.5)。由于 SV 的更大增加，[Formula: see text]在[Formula: see text]中超过 80 瓦时升高(所有 P<0.04)。SIT 后，[Formula: see text]增加([Formula: see text])(39.7±6.7 对 44.5±7.3；P = 0.015)和[Formula: see text]([Formula: see text])(47.2±4.4 对 52.4±6.0；P = 0.009)，[Formula: see text]在训练前后均具有更大的峰值[Formula: see text](P = 0.02 和 P = 0.03)。股四头肌肌肉氧合和 RPE 在组间无差异(所有 P>0.1)。与[Formula: see text]相反，[Formula: see text]反应者能够通过增加 SV 来提高 SIT 对亚最大[Formula: see text]-[Formula: see text]的反应。然而，增加的亚最大运动[Formula: see text]并不能使运动肌肉的氧合受益。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1f9e/6343875/f9d81a387408/pone.0195458.g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1f9e/6343875/c101a7a303a5/pone.0195458.g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1f9e/6343875/6906f70f227e/pone.0195458.g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1f9e/6343875/735814345f27/pone.0195458.g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1f9e/6343875/f9d81a387408/pone.0195458.g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1f9e/6343875/c101a7a303a5/pone.0195458.g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1f9e/6343875/6906f70f227e/pone.0195458.g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1f9e/6343875/735814345f27/pone.0195458.g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1f9e/6343875/f9d81a387408/pone.0195458.g004.jpg

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