Light sensors for objective light measurement in ambulatory polysomnography
Ambulatory polysomnography (PSG) does not commonly include an objective measure of light to determine the time of lights off (Loff), and thus cannot be used to calculate important indices such as sleep onset latency and sleep efficiency. This study examined the technical specifications and appropria...
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| description | Ambulatory polysomnography (PSG) does not commonly include an objective measure of light to determine the time of lights off (Loff), and thus cannot be used to calculate important indices such as sleep onset latency and sleep efficiency. This study examined the technical specifications and appropriateness of a prototype light sensor (LS) for use in ambulatory Compumedics Somte PSG.Two studies were conducted. The first examined the light measurement characteristics of the LS when used with a portable PSG device, specifically recording trace range, linearity, sensitivity, and stability. This involved the LS being exposed to varying incandescent and fluorescent light levels in a light controlled room. Secondly, the LS was trialled in 24 home and 12 hospital ambulatory PSGs to investigate whether light levels in home and hospital settings were within the recording range of the LS, and to quantify the typical light intensity reduction at the time of Loff. A preliminary exploration of clinical utility was also conducted. Linearity between LS voltage and lux was demonstrated, and the LS trace was stable over 14 hours of recording. The observed maximum voltage output of the LS/PSG device was 250 mV, corresponding to a maximum recording range of 350 lux and 523 lux for incandescent and fluorescent light respectively. At the time of Loff, light levels were within the recording range of the LS, and on average dropped by 72 lux (9-245) in the home and 76 lux (4-348) in the hospital setting. Results suggest that clinical utility was greatest in hospital settings where patients are less mobile. The LS was a simple and effective objective marker of light level in portable PSG, which can be used to identify Loff in ambulatory PSG. This allows measurement of additional sleep indices and support with clinical decisions. |
| doi_str_mv | 10.1371/journal.pone.0188124 |
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This study examined the technical specifications and appropriateness of a prototype light sensor (LS) for use in ambulatory Compumedics Somte PSG.Two studies were conducted. The first examined the light measurement characteristics of the LS when used with a portable PSG device, specifically recording trace range, linearity, sensitivity, and stability. This involved the LS being exposed to varying incandescent and fluorescent light levels in a light controlled room. Secondly, the LS was trialled in 24 home and 12 hospital ambulatory PSGs to investigate whether light levels in home and hospital settings were within the recording range of the LS, and to quantify the typical light intensity reduction at the time of Loff. A preliminary exploration of clinical utility was also conducted. Linearity between LS voltage and lux was demonstrated, and the LS trace was stable over 14 hours of recording. The observed maximum voltage output of the LS/PSG device was 250 mV, corresponding to a maximum recording range of 350 lux and 523 lux for incandescent and fluorescent light respectively. At the time of Loff, light levels were within the recording range of the LS, and on average dropped by 72 lux (9-245) in the home and 76 lux (4-348) in the hospital setting. Results suggest that clinical utility was greatest in hospital settings where patients are less mobile. The LS was a simple and effective objective marker of light level in portable PSG, which can be used to identify Loff in ambulatory PSG. This allows measurement of additional sleep indices and support with clinical decisions.</description><identifier>ISSN: 1932-6203</identifier><identifier>EISSN: 1932-6203</identifier><identifier>DOI: 10.1371/journal.pone.0188124</identifier><identifier>PMID: 29145507</identifier><language>eng</language><publisher>United States: Public Library of Science</publisher><subject>Accuracy ; Biology and Life Sciences ; Dentistry ; Electric potential ; Engineering and Technology ; Fluorescence ; Health sciences ; Laboratories ; Latency ; Light intensity ; Light levels ; Linearity ; Luminous intensity ; Medicine ; Medicine and Health Sciences ; Physical Sciences ; Portable equipment ; Recording ; Sensors ; Sleep ; Sleep apnea ; Studies ; Voltage</subject><ispartof>PloS one, 2017-11, Vol.12 (11), p.e0188124-e0188124</ispartof><rights>COPYRIGHT 2017 Public Library of Science</rights><rights>2017 Schembri et al. This is an open access article distributed under the terms of the Creative Commons Attribution License: http://creativecommons.org/licenses/by/4.0/ (the “License”), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.</rights><rights>2017 Schembri et al 2017 Schembri et al</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><cites>FETCH-LOGICAL-c641t-70936edc5c8a4b9197af8ab2a7a191a3f6f573e7e66200a1c2f86362c39c6a763</cites><orcidid>0000-0003-3087-887X</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC5690677/pdf/$$EPDF$$P50$$Gpubmedcentral$$Hfree_for_read</linktopdf><linktohtml>$$Uhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC5690677/$$EHTML$$P50$$Gpubmedcentral$$Hfree_for_read</linktohtml><link.rule.ids>230,314,727,780,784,864,885,2100,2926,23864,27922,27923,53789,53791,79370,79371</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/29145507$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><contributor>Curcio, Giuseppe</contributor><creatorcontrib>Schembri, Rachel</creatorcontrib><creatorcontrib>Spong, Jo</creatorcontrib><creatorcontrib>Peters, Allison</creatorcontrib><creatorcontrib>Rochford, Peter</creatorcontrib><creatorcontrib>Wilksch, Philip</creatorcontrib><creatorcontrib>O'Donoghue, Fergal J</creatorcontrib><creatorcontrib>Greenwood, Kenneth M</creatorcontrib><creatorcontrib>Barnes, Maree</creatorcontrib><creatorcontrib>Kennedy, Gerard A</creatorcontrib><creatorcontrib>Berlowitz, David J</creatorcontrib><title>Light sensors for objective light measurement in ambulatory polysomnography</title><title>PloS one</title><addtitle>PLoS One</addtitle><description>Ambulatory polysomnography (PSG) does not commonly include an objective measure of light to determine the time of lights off (Loff), and thus cannot be used to calculate important indices such as sleep onset latency and sleep efficiency. 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The observed maximum voltage output of the LS/PSG device was 250 mV, corresponding to a maximum recording range of 350 lux and 523 lux for incandescent and fluorescent light respectively. At the time of Loff, light levels were within the recording range of the LS, and on average dropped by 72 lux (9-245) in the home and 76 lux (4-348) in the hospital setting. Results suggest that clinical utility was greatest in hospital settings where patients are less mobile. The LS was a simple and effective objective marker of light level in portable PSG, which can be used to identify Loff in ambulatory PSG. This allows measurement of additional sleep indices and support with clinical decisions.</description><subject>Accuracy</subject><subject>Biology and Life Sciences</subject><subject>Dentistry</subject><subject>Electric potential</subject><subject>Engineering and Technology</subject><subject>Fluorescence</subject><subject>Health sciences</subject><subject>Laboratories</subject><subject>Latency</subject><subject>Light intensity</subject><subject>Light levels</subject><subject>Linearity</subject><subject>Luminous intensity</subject><subject>Medicine</subject><subject>Medicine and Health Sciences</subject><subject>Physical Sciences</subject><subject>Portable equipment</subject><subject>Recording</subject><subject>Sensors</subject><subject>Sleep</subject><subject>Sleep 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One</addtitle><date>2017-11-16</date><risdate>2017</risdate><volume>12</volume><issue>11</issue><spage>e0188124</spage><epage>e0188124</epage><pages>e0188124-e0188124</pages><issn>1932-6203</issn><eissn>1932-6203</eissn><abstract>Ambulatory polysomnography (PSG) does not commonly include an objective measure of light to determine the time of lights off (Loff), and thus cannot be used to calculate important indices such as sleep onset latency and sleep efficiency. This study examined the technical specifications and appropriateness of a prototype light sensor (LS) for use in ambulatory Compumedics Somte PSG.Two studies were conducted. The first examined the light measurement characteristics of the LS when used with a portable PSG device, specifically recording trace range, linearity, sensitivity, and stability. This involved the LS being exposed to varying incandescent and fluorescent light levels in a light controlled room. Secondly, the LS was trialled in 24 home and 12 hospital ambulatory PSGs to investigate whether light levels in home and hospital settings were within the recording range of the LS, and to quantify the typical light intensity reduction at the time of Loff. A preliminary exploration of clinical utility was also conducted. Linearity between LS voltage and lux was demonstrated, and the LS trace was stable over 14 hours of recording. The observed maximum voltage output of the LS/PSG device was 250 mV, corresponding to a maximum recording range of 350 lux and 523 lux for incandescent and fluorescent light respectively. At the time of Loff, light levels were within the recording range of the LS, and on average dropped by 72 lux (9-245) in the home and 76 lux (4-348) in the hospital setting. Results suggest that clinical utility was greatest in hospital settings where patients are less mobile. The LS was a simple and effective objective marker of light level in portable PSG, which can be used to identify Loff in ambulatory PSG. This allows measurement of additional sleep indices and support with clinical decisions.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>29145507</pmid><doi>10.1371/journal.pone.0188124</doi><tpages>e0188124</tpages><orcidid>https://orcid.org/0000-0003-3087-887X</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | Accuracy Biology and Life Sciences Dentistry Electric potential Engineering and Technology Fluorescence Health sciences Laboratories Latency Light intensity Light levels Linearity Luminous intensity Medicine Medicine and Health Sciences Physical Sciences Portable equipment Recording Sensors Sleep Sleep apnea Studies Voltage |
| title | Light sensors for objective light measurement in ambulatory polysomnography |
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