期刊
JOURNAL OF APPLIED PHYSIOLOGY
卷 94, 期 1, 页码 205-212出版社
AMER PHYSIOLOGICAL SOC
DOI: 10.1152/japplphysiol.00585.2002
关键词
ventilatory stability; gender; sleep apnea; control of breathing
资金
- NATIONAL CENTER FOR RESEARCH RESOURCES [M01RR002635] Funding Source: NIH RePORTER
- NATIONAL HEART, LUNG, AND BLOOD INSTITUTE [R01HL048531, T32HL007901] Funding Source: NIH RePORTER
- NCRR NIH HHS [M01 RR-02635] Funding Source: Medline
- NHLBI NIH HHS [R01 HL-48531, T32 HL-07901-04] Funding Source: Medline
We hypothesized that increased chemical control instability (CCI) in men could partially explain the male predominance in obstructive sleep apnea (OSA). CCI was assessed by sequentially increasing respiratory control system loop gain (LG) with proportional-assist ventilation (PAV) in 10 men (age 24-48 yr) and 9 women (age 22-36 yr) until periodic breathing or awakening occurred. Women were studied in both the follicular and luteal phases of the menstrual cycle. The amount by which PAV amplified LG was quantified from the tidal volume amplification factor [(VTAF) assisted tidal volume/unassisted tidal volume]. LG was calculated as the inverse of the VTAF occurring at the assist level immediately preceding the emergence of periodic breathing (when LG X VTAF=1). Only 1 of 10 men and 2 of 9 women developed periodic breathing with PAV. The rest were resistant to periodic breathing despite moderately high levels of PAV amplification. We conclude that LG is low in the majority of normal men and women and that higher volume amplification factors are needed to determine whether gender differences exist in this low range.
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