Ventilatory control of the ‘isocapnic buffering’ region in rapidly-incremental exercise

Whipp, Brian J.; Davis, James A.; Wasserman, Karlman

doi:10.1016/0034-5687(89)90076-5

Cited by 181 publications

(139 citation statements)

References 13 publications

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“…VT was determined by using the criteria of an increase in both VE · VO 2 Ϫ1 and end-tidal partial pressure of oxygen (PET O 2 ) with no concomitant increase in VE · VCO 2 Ϫ1 [20]. RCP was determined by using the criteria of an increase in both the VE · VO 2 Ϫ1 and VE · VCO 2 Ϫ1 and a decrease in PET CO 2 [20]. VT and RCP were detected by two independent observers.…”

mentioning

confidence: 99%

Effects of Endurance Training on the Breathing Pattern of Professional Cyclists.

Lucı́a

Hoyos²,

Pardo³

et al. 2001

JJP

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[6][7][8]. From some of these data, it appears that physical training causes tidal volume (VT) to increase and breathing frequency ( f b ) to decrease for a given level of minute ventilation (VE). For example, extremely fit oarswomen exhibit a slower, deeper breathing pattern than less-fit oarswomen or sedentary subjects [8]. Some other cross-sectional studies, however, provide no definitive evidence of a change toward a "slower deeper breathing" with endurance training [5,7]. On the other hand, surprisingly little research has focused on analyzing the effects of training on breathing pattern by using a longitudinal design. In a prospective study, McParland and co-workers [9] reported no significant effect of shortterm activity specific endurance training (five weekly sessions of 40 min each at ϳ75% VO 2 max ) on the breathing pattern of healthy, nontrained individuals. Comparable findings were obtained by Clark et al.[10] in nontrained subjects. Recently, Miyachi and Katayama reported that the hyperventilatory response of moderately trained subjects during heavy exercise

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mentioning

confidence: 99%

Effects of Endurance Training on the Breathing Pattern of Professional Cyclists.

Lucı́a

Hoyos²,

Pardo³

et al. 2001

JJP

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“…This additional ventilatory response is called the respiratory compensation point (RCP) (4). The region between the AT and RCP is defined as the isocapnic buffering (ICB) phase and represents a phase of compensation for the exercise-induced metabolic acidosis (5). The region between the RCP and the end of exercise is defined as the phase of hypocapnic hyperventilation (HHV) (6,7).…”

Section: Introductionmentioning

confidence: 99%

“…The length of the ICB phase may be related to buffering capacity and lactate kinetics as well as the sensitivity of the carotid bodies to exercise-induced metabolic acidosis (5,(8)(9)(10). Some researchers suggested that the ICB phase contributes to the aerobic capacity in athletes (7).…”

Section: Introductionmentioning

confidence: 99%

The Relationship between the Isocapnic Buffering Phase and Ventilatory Threshold in Endurance Athletes and Team Sport Athletes during an Incremental Exercise Test

Eryılmaz

Polat

Soyal³

et al. 2018

Ann. Appl. Sport Sci

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Background. There is sparse literature examining the ICB phase of aerobic-and anaerobic-trained athletes. Measurements of ICB phase values of athletes can help to evaluate the sport's physiological demands and understand the physiological adaptations in response to physical training. Objectives. The purpose of this study was to examine the relationship between the isocapnic buffering (ICB) phase and the maximal oxygen uptake (VO2max) as well as the ventilatory threshold (VT) in trained athletes. Methods. Twenty-eight male endurance athletes and forty male team sports athletes underwent an incremental treadmill test to determine their VT, respiratory compensation point (RCP), and VO2max. The ICB phase was calculated as the difference in Oxygen uptake (VO2) between the RCP and VT and expressed in either absolute or relative values. Results. The VO2max, maximal running speed, time to exhaustion, VO2 at the VT and RCP, running speed at the VT, and VT expressed as % VO2max was higher in the endurance athletes than in the team sport athletes (p < 0.01), whereas the RCP expressed as % VO2max and running speed at the RCP showed similar values in both groups (p > 0.05). Both the absolute and relative ICB phase values were found to be significantly higher in team sports athletes than in endurance athletes (p < 0.001). The relative ICB phase was significantly negatively correlated with the VO2max (-r = 0.517, p < 0.001), the VO2 at the VT (-r = 0.755, p < 0.001), and the VO2 at the RCP (r = -0.517, p = 0.001). Conclusion. The current findings suggest that, for trained athletes, the magnitude of the ICB phase is more closely related to the VT rather than the VO2max and RCP. Presumably, the high-intensity intermittent-type exercises performed by team sports athletes may have improved their buffering capacity, leading to a shift in the RCP without a change in the VT, and consequently enhancing the ICB phase.

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“…Bunun sonucunda AE üstünde kısa bir süre için VE/ VCO2 de sabitlenme VE/VO2 de ise artış şeklinde deği-şimler gözlenmektedir (1,8). İş gücünün artması ile egzersiz hiperventilasyonun başlangıcını tanımlayan solunum kompansasyon noktasından (SKN) itibaren VE/VCO2 ve VE/VO2 sistematik artışlar gözlenmektedir (1,9,10).…”

Section: Introductionunclassified

Artan Yüke Karşı Egzersiz Testi Sırasında Solunum Etkinliğinin Antrenmanlı ve Sedanter Erkek Deneklerde Karşılaştırılmalı İncelenmesi

Özdenk¹

2018

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Sonuç: AE ve SKN de elde edilen ve solunum etkinliğini gösteren en düşük VE/VCO2 oranı her iki grupta istatistiksel olarak farklılık göstermedi. Böylece artan VE/VCO2 oranı, zayıflayan aerobik fitnes göstergesi olarak kullanılmasına rağmen, bu kriterin artan fitnes seviyesi göstergesi olarak kullanılamayacağı belirlenmiştir.Anahtar Kelimeler: Egzersiz, solunum etkinliği, akciğer gaz değişimi, aerobik fitnes, anaerobik eşik Abstract Objective: Ventilatory efficiency, which describes the ratio between ventilation to CO2 output (VE/VCO2) during an incremental exercise test has been used to evaluate fitness levels of the subjects. During exercise, the lowest VE/VCO2 ratio above 34 shows increased mortality levels. In the present study, we comparatively evaluated ventilatory efficiency in trained and sedentary males that the lowest VE/VCO2 ratio could be related fitness levels of the subjects. Materials and Methods:Ten trained (age: 20.1±0.4 yr) and 10 sedentary (age:19.8±0.7 yr) male subjects were performed an incremental exercise (15 W/min) test. Ventilatory gas exchange parameters were evaluated breath-by-breath using metabolic gas analyser. Anaerobic threshold (AT) and respiratory compensation point (RCP) estimated from the gas exchange values. Results:Work rates for trained and sedentary subjects were found to be 143±8 W vs 123±5 W at the AT, 170±9 W vs 148±6 W at the RCP and 222±9 W vs 204±7 W at the end of the test, respectively. VE/VCO2 ratio for trained and sedentary subjects were found to be 32±0.6 vs 32±1.6 at the beginning of test and 26.5±0.7 vs 26±1 at the AT, 27.5±0.7 vs 26±0.9 at the RCP and 30±1.1 vs 30±1.3 at the end of the test. Conclusion:The lowest VE/VCO2 ratio, reflects optimal ventilatory efficiency obtained at the AT and RPC, was not statistically different in both groups. While increased VE/VCO2 ratio could be a useful criteria to evaluate reduced aerobic fitness levels, it can not be use to indicate increased aerobic fitness levels.

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Ventilatory control of the ‘isocapnic buffering’ region in rapidly-incremental exercise

Cited by 181 publications

References 13 publications

Effects of Endurance Training on the Breathing Pattern of Professional Cyclists.

Effects of Endurance Training on the Breathing Pattern of Professional Cyclists.

The Relationship between the Isocapnic Buffering Phase and Ventilatory Threshold in Endurance Athletes and Team Sport Athletes during an Incremental Exercise Test

Artan Yüke Karşı Egzersiz Testi Sırasında Solunum Etkinliğinin Antrenmanlı ve Sedanter Erkek Deneklerde Karşılaştırılmalı İncelenmesi

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