Journal of Applied Physiology
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J Appl Physiol 92: 2535-2541, 2002. First published March 1, 2002; doi:10.1152/japplphysiol.00553.2001
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Vol. 92, Issue 6, 2535-2541, June 2002

Gender differences in upper airway compliance during NREM sleep: role of neck circumference

James A. Rowley, Carrie S. Sanders, Brian R. Zahn, and M. Safwan Badr

Sleep Research Laboratory, John D. Dingell Veterans Affairs Medical Center, and Division of Pulmonary, Critical Care and Sleep Medicine, Department of Medicine, Wayne State University School of Medicine, Detroit, Michigan 48201

It has been proposed that the gender difference in sleep apnea prevalence is related to gender differences in upper airway structure and function. We hypothesized that men would have smaller retropalatal cross-sectional area and higher compliance during sleep compared with women. Using upper airway imaging, we measured upper airway cross-sectional area and retropalatal compliance in wakefulness and non-rapid eye movement (NREM) sleep in 15 men and 15 women without sleep-disordered breathing. Cross-sectional area at the beginning of inspiration tended to be larger in men compared with women in both wakefulness [194.5 ± 21.3 vs. 138.8 ± 12.0 (SE) mm2] and NREM sleep (111.1 ± 17.6 vs. 83.3 ± 11.9 mm2; P = 0.058). There was no significant difference, however, after correction for body surface area. Retropalatal compliance also tended to be higher in men during both wakefulness (5.9 ± 1.4 vs. 3.1 ± 1.4 mm2/cmH2O; P = 0.006) and NREM sleep (12.6 ± 2.7 vs. 4.7 ± 2.6 mm2/cmH2O; P = 0.055). However, compliance was similar in men relative to women after correction for neck circumference. We conclude that the gender difference in retropalatal compliance is more accurately attributed to differences in neck circumference between the genders.

cross-sectional area; upper airway imaging; upper airway structure; non-rapid eye movement sleep


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