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Nagpal C, Upadhyay PK. A multi-scale channel-wise convolution-based multi-level heat stress assessment. Neural Comput Appl 2022. [DOI: 10.1007/s00521-022-07518-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Torabi-Nami M, Mehrabi S, Borhani-Haghighi A, Derman S. Withstanding the obstructive sleep apnea syndrome at the expense of arousal instability, altered cerebral autoregulation and neurocognitive decline. J Integr Neurosci 2015; 14:169-93. [DOI: 10.1142/s0219635215500144] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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Downs CT, Awuah A, Jordaan M, Magagula L, Mkhize T, Paine C, Raymond-Bourret E, Hart LA. Too hot to sleep? Sleep behaviour and surface body temperature of Wahlberg's Epauletted Fruit Bat. PLoS One 2015; 10:e0119419. [PMID: 25775371 PMCID: PMC4361190 DOI: 10.1371/journal.pone.0119419] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2014] [Accepted: 01/13/2015] [Indexed: 11/18/2022] Open
Abstract
The significance of sleep and factors that affect it have been well documented, however, in light of global climate change the effect of temperature on sleep patterns has only recently gained attention. Unlike many mammals, bats (order: Chiroptera) are nocturnal and little is known about their sleep and the effects of ambient temperature (Ta) on their sleep. Consequently we investigated seasonal temperature effects on sleep behaviour and surface body temperature of free-ranging Wahlberg’s epauletted fruit bat, Epomophorus wahlbergi, at a tree roost. Sleep behaviours of E. wahlbergi were recorded, including: sleep duration and sleep incidences (i.e. one eye open and both eyes closed). Sleep differed significantly across all the individuals in terms of sleep duration and sleep incidences. Individuals generally spent more time awake than sleeping. The percentage of each day bats spent asleep was significantly higher during winter (27.6%), compared with summer (15.6%). In summer, 20.7% of the sleeping bats used one eye open sleep, and this is possibly the first evidence of one-eye-sleep in non-marine mammals. Sleep duration decreased with extreme heat as bats spent significantly more time trying to cool by licking their fur, spreading their wings and panting. Skin temperatures of E. wahlbergi were significantly higher when Ta was ≥35°C and no bats slept at these high temperatures. Consequently extremely hot days negatively impact roosting fruit bats, as they were forced to be awake to cool themselves. This has implications for these bats given predicted climate change scenarios.
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Affiliation(s)
- Colleen T. Downs
- School of Life Sciences, University of KwaZulu-Natal, P/Bag X01, Scottsville, Pietermaritzburg, 3209, South Africa
- * E-mail:
| | - Adwoa Awuah
- School of Life Sciences, University of KwaZulu-Natal, P/Bag X01, Scottsville, Pietermaritzburg, 3209, South Africa
| | - Maryna Jordaan
- School of Life Sciences, University of KwaZulu-Natal, P/Bag X01, Scottsville, Pietermaritzburg, 3209, South Africa
| | - Londiwe Magagula
- School of Life Sciences, University of KwaZulu-Natal, P/Bag X01, Scottsville, Pietermaritzburg, 3209, South Africa
| | - Truth Mkhize
- School of Life Sciences, University of KwaZulu-Natal, P/Bag X01, Scottsville, Pietermaritzburg, 3209, South Africa
| | - Christine Paine
- School of Life Sciences, University of KwaZulu-Natal, P/Bag X01, Scottsville, Pietermaritzburg, 3209, South Africa
| | - Esmaella Raymond-Bourret
- School of Life Sciences, University of KwaZulu-Natal, P/Bag X01, Scottsville, Pietermaritzburg, 3209, South Africa
| | - Lorinda A. Hart
- School of Life Sciences, University of KwaZulu-Natal, P/Bag X01, Scottsville, Pietermaritzburg, 3209, South Africa
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Hsu YL, Yang YT, Wang JS, Hsu CY. Automatic sleep stage recurrent neural classifier using energy features of EEG signals. Neurocomputing 2013. [DOI: 10.1016/j.neucom.2012.11.003] [Citation(s) in RCA: 91] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Sex differences in sleep pattern of rats in an experimental model of osteoarthritis. Eur J Pain 2012; 15:545-53. [DOI: 10.1016/j.ejpain.2010.10.009] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2010] [Revised: 09/20/2010] [Accepted: 10/15/2010] [Indexed: 01/22/2023]
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de Souza L, Andersen ML, Smaili SS, Lopes GS, Ho PS, Papale LA, Tufik S. Age-related changes during a paradigm of chronic sleep restriction. Behav Brain Res 2010; 214:201-5. [PMID: 20580748 DOI: 10.1016/j.bbr.2010.05.025] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2009] [Revised: 05/11/2010] [Accepted: 05/18/2010] [Indexed: 11/17/2022]
Abstract
Fragmented and restricted sleep is a common problem for the human elderly. There is evidence that aging impairs sleep in animals as well. After sleep deprivation, older animals have less sleep rebound. Despite increasing complaints of reduced time for sleep in contemporary society, few studies have examined chronic sleep restriction protocols in animals. Therefore, the aim of the present study was to evaluate the effects of chronic sleep restriction on the sleep patterns of aged rats. Using the single platform method, 22-month-old male rats were submitted to 18 h of sleep restriction followed by 6 h of total sleep opportunity. The sleep-wake cycles of these rats were recorded for 6h/day throughout the 12-day procedure. The results showed that total sleep time and NREM sleep were reduced during the 12-day sleep restriction period. However, rebound REM sleep was only significant on day 6. A negative rebound was also seen, particularly during the last days of the chronic sleep restriction period. Furthermore, sleep latency and mean wake bout length progressively increased during the protocol. These findings indicate that older rats have an inability to restore their sleep patterns during extended sleep deprivation.
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Affiliation(s)
- Luciane de Souza
- Departamento de Psicobiologia, Universidade Federal de São Paulo, Rua Napoleão de Barros, 925, Vila Clementino - 04024-002, São Paulo, SP, Brazil
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