| Authors | Avraam, J. Bourke, R. Trinder, J.A. Nicholas, C.L. Brazzale, D. O'Donoghue, F.J. Rochford, P.D. Jordan, A.S. |
|---|---|
| Type | Journal Article (Original Research) |
| Journal | Journal of Applied Physiology |
| Year of Publication | 2016 |
| URL | http://jap.physiology.org/content/early/2016/10/04/japplphysiol.00571.2016 |
| DOI | http://dx.doi.org/10.1152/japplphysiol.00571.2016 |
| Download |  1169full_.pdf (752.1 KB) |
| Abstract | Respiratory magnetometers are increasingly being used in sleep studies to measure changes in end expiratory lung volume (EELV), including in obese obstructive sleep apnea (OSA) patients. Despite this, the accuracy of magnetometers has not been confirmed in obese patients, nor compared between genders. Thus, we compared spirometer-measured and magnetometer-estimated lung volume and tidal volume changes during voluntary end-expiratory lung volume changes of 1.5L, 1L, and 0.5L above, and 0.5L below, functional respiratory capacity (FRC) in supine normal weight (BMI<25kg/m2) and healthy obese (BMI>30kg/m2) men and women. Two different magnetometer calibration techniques proposed by Banzett (2) and Sackner (28) were assessed. Across all groups and target volumes, magnetometers overestimated spirometer-measured EELV by approximately 65mL (p<0.001) with no difference between techniques (p=0.07). The Banzett method overestimated the spirometer EELV change in normal weight women for all target volumes except +0.5L whereas no differences between mass or gender groups were observed for the Sackner technique. The variability of breath-to-breath measures of EELV was significantly higher for obese compared to non-obese subjects and was higher for the Sackner than Banzett technique. On the other hand, for tidal volume both calibration techniques underestimated spirometer measurements (p< 0.001), with the underestimation being more marked for the Banzett than Sackner technique (p=0.03), in obese than normal weight (p<0.001) and in men than in women (p=0.003). These results indicate that both body mass and gender affect the accuracy of respiratory magnetometers in measuring EELV and tidal volume |
http://www.ibas.org.au/what-we-do/publications/3872874
Interstitial lung disease (ILD) is a chronic lung condition that causes stiff lungs and restricts sufferers from taking a deep breath. Exercise in a gym, such as walking or riding a bike, can help make...
Sleep apnea is a condition where breathing is abnormal during sleep. There are two main forms of sleep apnea: obstructive and central. For obstructive sleep apnea, breathing is reduced because the airway...
DO YOU HAVE SPINAL CORD INJURY? TIRED? GET TREATED!
Melbourne researchers have found that 80 percent of people with quadriplegic spinal injuries have sleep apnoea. It's having a big effect on their lives but they don't know they have it, and they don't know it can be treated.
WORLD 1ST HEAVY VEHICLE DRIVER FATIGUE STUDY RELEASED
The National Transport Commission (NTC) and the Cooperative Research Centre for Alertness, Safety and Productivity (Alertness CRC) have released the results of what is hailed as a world-first study into heavy vehicle driver fatigue.
AAMRI ELECTION STATEMENT RELEASED ON 25TH MARCH 2019
AAMRI released its election statement calling on politicians to commit to three main priorities: ensuring the MRFF reaches $20 billion by 2020-21, provide continued strong support for the NHMRC, and develop sustainable and rewarding career pathways.
PORTRAIT UNVEILED AT CANBERRA'S PARLIAMENT HOUSE
IBAS Director Anna Burke had barely got into the swing of her speech at the unveiling of her portrait at Canberra's Parliament House when the ringing of bells caused half her audience to hurry away.
© 2020 Institute for Breathing and Sleep. All Rights Reserved. ABN 39 093 685 879
Powered by Helmut Design | Manage
