Cardiorespiratory responses of swimmers to hypoxia and hypercapnia

Диверт, В. Э.; Komlyagina, T. G.; Красникова, Н В; Martynov, Alexandr Bronislavovich; Timofeev, Sergei Igorevich; Krivoschekov, S. G.

doi:10.15293/2226-3365.1705.14

Cited by 4 publications

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“…Previously, researchers considered the features of the influence of hypercapnia on ventilation, using the concepts of threshold, response, reactivity, and sensitivity (slope). This approach has shown some specific ventilatory responses to hypercapnia and hypoxia possibly because of adaptation to frequent high-altitude climbing ( Puthon et al, 2016 ) or training-specific physiological adaptation ( Divert et al, 2017 ), genetic factors ( Goldberg et al, 2017 ), and even the presence of patent foramen ovale ( Davis et al, 2019 ). We have not found any differences in the considered respiratory parameters at rest, as well as ventilatory thresholds and CO 2 sensitivities before and after the high-altitude expedition.…”

Section: Discussionmentioning

confidence: 99%

“…We have previously demonstrated that in swimming and skiing correlations between the responses of the cardiovascular and respiratory systems to acute hypoxic and hypercapnic tests are training-specific ( Divert et al, 2015 , 2017 ). Later we revealed that cardiorespiratory coherence changes in response to hypoxic exposure depend upon fitness status ( Uryumtsev et al, 2020 ).…”

Section: Introductionmentioning

confidence: 99%

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Cardiorespiratory Coordination in Hypercapnic Test Before and After High-Altitude Expedition

Gultyaeva¹,

Uryumtsev

Зинченко

et al. 2021

Front. Physiol.

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Coordination of cardiovascular and respiratory systems enables a wide range of human adaptation and depends upon the functional state of an individual organism. Hypoxia is known to elicit changes in oxygen and carbon dioxide sensitivity, while training alters cardiorespiratory coordination (CRC). The delayed effect of high altitude (HA) acclimatization on CRC in mountaineers remains unknown. The objective of this study was to compare CRC in acute hypercapnia in mountaineers before and after a HA expedition. Nine trained male mountaineers were investigated at sea level before (Pre-HA) and after a 20-day sojourn at altitudes of 4,000–7,000 m (Post-HA) in three states (Baseline, Hypercapnic Rebreathing, and Recovery). A principal component (PC) analysis was performed to evaluate the CRC. The number of mountaineers with one PC increased Post-HA (nine out of nine), compared to Pre-HA (five out of nine) [Chi-square (df = 1) = 5.14, P = 0.023]; the percentage of total variance explained by PC1 increased [Pre-HA median 65.6 (Q1 64.9/Q3 74.9), Post-HA 75.6 (73.3/77.9), P = 0.028]. Post-HA, the loadings of the expired fraction of O2, CO2, and ventilation onto PC1 did not change, and the loading of heart rate increased [Pre-HA 0.64 (0.45/0.68) and Post-HA 0.76 (0.65/0.82), P = 0.038]. During the Recovery, the percentage of total variance explained by PC1 was higher than during the Baseline. Post-HA, there was a high correlation between the Exercise addiction scores and the eigenvalues of PC1 (r = 0.9, P = 0.001). Thus, acute hypercapnic exposure reveals the Post-HA increase in cardiorespiratory coordination, which is highly related to the level of exercise addiction.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cardiorespiratory Coordination in Hypercapnic Test Before and After High-Altitude Expedition

Gultyaeva¹,

Uryumtsev

Зинченко

et al. 2021

Front. Physiol.

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“…Since the integrating factor for the respiratory and cardiovascular anatomical systems is the oxygen supply, acute hypoxia provides an appropriate paradigm within which to assess how the integration between systems changes across physical training. We have previously demonstrated that the magnitude of the relationship between the hypoxic responses of the systems depends on the kind of sport and the athlete’s qualification level ( Divert et al, 2015 , 2017 ). In contrast to less experienced swimmers, for example, high-level swimmers show high intra-group correlations between cardiorespiratory indices in response to acute hypoxia and hypercapnia ( Divert et al, 2017 ).…”

Section: Introductionmentioning

confidence: 99%

“…We have previously demonstrated that the magnitude of the relationship between the hypoxic responses of the systems depends on the kind of sport and the athlete’s qualification level ( Divert et al, 2015 , 2017 ). In contrast to less experienced swimmers, for example, high-level swimmers show high intra-group correlations between cardiorespiratory indices in response to acute hypoxia and hypercapnia ( Divert et al, 2017 ). Similarly, among ski racers, the highest results are achieved in the case of highly correlating chemoreflex responses of the respiratory and heart systems, assessed in hypoxic and hypercapnic tests ( Divert et al, 2015 ).…”

Section: Introductionmentioning

confidence: 99%

Effect of Acute Hypoxia on Cardiorespiratory Coherence in Male Runners

et al. 2020

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Understanding the mechanisms of oxygen supply regulation, which involves the respiratory and cardiovascular systems, during human adaptation to intense physical activity, accompanied by hypoxemia, is important for the management of a training process. The objectives of this study were to investigate the cardiorespiratory coherence (CRC) changes in the low-frequency band in response to hypoxic exposure and to verify a dependence of these changes upon sports qualification level in athletes. Twenty male runners aged 17-25 years were exposed to acute normobaric hypoxia (10% O 2) for 10 min. Respiration, gas exchange, and heart rate were measured at baseline, during hypoxia, and after the exposure. To evaluate cardiorespiratory coupling, squared coherence was calculated based on 5-s averaged time series of heart and respiratory rhythms. Based on sports qualification level achieved over 4 years after the experimental testing, athletes were retrospectively divided into two groups, one high level (HLG, n = 10) and the other middle level (MLG, n = 10). No differences in anthropometric traits were observed between the groups. In the pooled group, acute hypoxia significantly increased CRC at frequencies 0.030-0.045 Hz and 0.075 Hz. In response to hypoxia, oxygen consumption decreased in HLG, and carbon dioxide production and ventilation increased in MLG. At 0.070-0.080 Hz frequencies in hypoxia, the CRC in HLG was higher than in MLG. Thus, highly qualified athletes enhance intersystem integration in response to hypoxia. This finding can be a physiological sign for the prognosis of qualification level in runners.

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Biological effects of oxygen-enriched drinking water. Review. Part 1

Rakhmanin

Egorova

Mihaylova

et al. 2020

Hygiene and Sanitation

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Human life on Earth depends on the continuous availability of oxygen, but conditions for the entry of oxygen into the cells of the body change in time and space, easily broken, owing to what may develop hypoxia - a condition of oxygen starvation of tissues. The first part of the review provides information on the maintenance of oxygen homeostasis in cells, on the key component responsible for the regulation of the molecular response to hypoxia - the HIFs family of transcription factors (Hypoxia-Inducible Factors). It is indicated that it is possible to compensate for the lack of oxygen in the body by delivering it to cells and tissues with water and various oxygen cocktails. Data from experimental studies of the biological effect of oxygenated drinking water, as well as the results of studying the effects of oxygen-enriched drinking water with the participation of volunteers are presented. The issue of the formation of oxygen (free) radicals when drinking oxygen-enriched drinking water is considered. The second part of the review will provide data on the successful use of oxygen-rich water in domestic therapeutic and surgical practice in complex treatment in order to reduce the negative effect of hypoxia in patients with chronic heart failure and generalized peritonitis complicated by intestinal insufficiency syndrome; on the method of improving the supply of oxygen to the body using enteral oxygen therapy - oxygen cocktails - for diseases of the heart, lungs, bronchi and gastrointestinal tract, atopic dermatitis, placental insufficiency, as well as to improve physical and mental performance. The review draws specialist’s attention to the problem of the biological effect of oxygen-enriched drinking water, its insufficient knowledge and the possible yet unrealized potential in terms of preventing various diseases and maintaining optimal human health.

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Cardiorespiratory responses of swimmers to hypoxia and hypercapnia

Cited by 4 publications

References 0 publications

Cardiorespiratory Coordination in Hypercapnic Test Before and After High-Altitude Expedition

Cardiorespiratory Coordination in Hypercapnic Test Before and After High-Altitude Expedition

Effect of Acute Hypoxia on Cardiorespiratory Coherence in Male Runners

Biological effects of oxygen-enriched drinking water. Review. Part 1

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