| Exercise hyperpnea and hypercapnic ventilatory responses in women. | |
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MedLine Citation:
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PMID: 16934968 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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We studied the relationship between exercise hyperpnea (i.e., ventilatory dynamics) at the onset of exercise and hypercapnic ventilatory response (HCVR), and their differences between the follicular (FP) and luteal (LP) phases of the menstrual cycle in six healthy females. HCVR was tested under three O(2) conditions: hyperoxia (FiO(2)=1.0), normoxia (0.21), and hypoxia (0.12). HCVR was defined as the relationship between the end-tidal P(CO2) and minute ventilation (V(E)) using the regression line of the CO(2) slope and a mimetically apneic threshold of CO(2). HCVR provocation and measurements were conducted using an inspired CO(2) concentration of up to approximately 8 mmHg higher than the end-tidal P(CO2) level of basal isocapnic the end-tidal P(CO2) at each menstrual both the slope and threshold in HCVR showed no statistically significant difference between LP and FP under any inspired FiO(2) conditions. In the case of exercise hyperpnea during the onset of submaximal exercise, the mean response time (MRT) in V(E) dynamics showed no significant difference between LP and FP. Consequently, MRT in V(E) response was not related to the slope in HCVR. During steady-state exercise, even though the V(E)/V(CO2) showed no significance between LP and FP, V(E)/V(CO2) was significantly related to the slope in HCVR (r=0.59, P<0.05). Exercise ventilation (i.e., V(E)/V(CO2)) would partly be adjusted by the enhancement of the chemoreflex drive to CO(2) only during the steady-state exercise. |
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Authors:
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Masahiro Itoh; Hatsumi Ueoka; Tomoko Aoki; Norio Hotta; Yoshiko Kaneko; Chizuko Takita; Yoshiyuki Fukuoka |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2006-08-28 |
Journal Detail:
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Title: Respiratory medicine Volume: 101 ISSN: 0954-6111 ISO Abbreviation: Respir Med Publication Date: 2007 Mar |
Date Detail:
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Created Date: 2007-02-09 Completed Date: 2007-04-23 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8908438 Medline TA: Respir Med Country: England |
Other Details:
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Languages: eng Pagination: 446-52 Citation Subset: IM |
Affiliation:
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Department of Physiology, Kumamoto University School of Health Sciences, Kumamoto 862-0976, Japan. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Apnea / physiopathology* Carbon Dioxide / physiology Exercise / physiology* Exercise Test / methods Female Follicular Phase / physiology Humans Hypercapnia / physiopathology* Luteal Phase / physiology Menstrual Cycle / physiology* Oxygen / physiology Reaction Time / physiology Respiration* Respiratory Function Tests / methods |
| Chemical | |
Reg. No./Substance:
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124-38-9/Carbon Dioxide; 7782-44-7/Oxygen |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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