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Prolonged sleep deprivation and continuous exercise: effects on melatonin, tympanic temperature, and cognitive function.

Davis GR, Etheredge CE, Marcus L, Bellar D - Biomed Res Int (2014)

Bottom Line: During the 36 hours of competition, melatonin levels were negatively correlated with the day of the race (rs = -0.277, P = 0.039) and positively associated with nighttime (rs = 0.316, P = 0.021).During the event tympanic temperature declined and was associated with an increase in lapses in attention.With sustained endurance events becoming more popular future research is warranted to evaluate the physiological impact of participation.

View Article: PubMed Central - PubMed

Affiliation: School of Kinesiology, University of Louisiana at Lafayette, Lafayette, LA 70504, USA.

ABSTRACT
The purpose of this study was to examine tympanic temperature, melatonin, and cognitive function during a 36-hour endurance event. Nine male and three female participants took part in a 36-hour sustained endurance event without sleep (N = 12, mean age = 31.8 ± 5.0 yrs). Participants were stopped for data collection at checkpoints throughout the 36-hour event. Tympanic temperature was assessed, a psychomotor vigilance test (PVT) was administered, and saliva samples were collected. Salivary melatonin was determined via immunoassay. During the 36 hours of competition, melatonin levels were negatively correlated with the day of the race (rs = -0.277, P = 0.039) and positively associated with nighttime (rs = 0.316, P = 0.021). Significant main effects of tympanic temperature (P < 0.001), day of the competition (P = 0.018), and a tympanic temperature ∗ day of competition interaction (P < 0.001) were used to predict minor lapses in attention. No associations between melatonin levels and cognitive function were observed (P > 0.05). During the event tympanic temperature declined and was associated with an increase in lapses in attention. With sustained endurance events becoming more popular future research is warranted to evaluate the physiological impact of participation.

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Related in: MedlinePlus

Mean major lapses by day of race. Error bars represent ± SEM.
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fig3: Mean major lapses by day of race. Error bars represent ± SEM.

Mentions: General Linear Model analysis was conducted to predict minor lapses in attention (Omnibus Test P < 0.001) and resulted in significant main effects for tympanic temperature (P < 0.001), day of the competition (P = 0.018), and a tympanic temperature ∗ day of competition interaction (P < 0.001). During the 36 hours of the endurance event the participants' tympanic temperature declined (day 1: 38.0 ± 0.7°C, day 2: 37.7 ± 1.0°C, and day 3: 36.6 ± 0.7°C) and was associated with an increase in lapses in attention (day 1: 5.7 ± 4.3 lapses, day 2: 6.6 ± 5.7 lapses, and day 3: 13.0 ± 7.5 lapses). Major lapses by day of the competition can be seen in Figure 3.


Prolonged sleep deprivation and continuous exercise: effects on melatonin, tympanic temperature, and cognitive function.

Davis GR, Etheredge CE, Marcus L, Bellar D - Biomed Res Int (2014)

Mean major lapses by day of race. Error bars represent ± SEM.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4109589&req=5

fig3: Mean major lapses by day of race. Error bars represent ± SEM.
Mentions: General Linear Model analysis was conducted to predict minor lapses in attention (Omnibus Test P < 0.001) and resulted in significant main effects for tympanic temperature (P < 0.001), day of the competition (P = 0.018), and a tympanic temperature ∗ day of competition interaction (P < 0.001). During the 36 hours of the endurance event the participants' tympanic temperature declined (day 1: 38.0 ± 0.7°C, day 2: 37.7 ± 1.0°C, and day 3: 36.6 ± 0.7°C) and was associated with an increase in lapses in attention (day 1: 5.7 ± 4.3 lapses, day 2: 6.6 ± 5.7 lapses, and day 3: 13.0 ± 7.5 lapses). Major lapses by day of the competition can be seen in Figure 3.

Bottom Line: During the 36 hours of competition, melatonin levels were negatively correlated with the day of the race (rs = -0.277, P = 0.039) and positively associated with nighttime (rs = 0.316, P = 0.021).During the event tympanic temperature declined and was associated with an increase in lapses in attention.With sustained endurance events becoming more popular future research is warranted to evaluate the physiological impact of participation.

View Article: PubMed Central - PubMed

Affiliation: School of Kinesiology, University of Louisiana at Lafayette, Lafayette, LA 70504, USA.

ABSTRACT
The purpose of this study was to examine tympanic temperature, melatonin, and cognitive function during a 36-hour endurance event. Nine male and three female participants took part in a 36-hour sustained endurance event without sleep (N = 12, mean age = 31.8 ± 5.0 yrs). Participants were stopped for data collection at checkpoints throughout the 36-hour event. Tympanic temperature was assessed, a psychomotor vigilance test (PVT) was administered, and saliva samples were collected. Salivary melatonin was determined via immunoassay. During the 36 hours of competition, melatonin levels were negatively correlated with the day of the race (rs = -0.277, P = 0.039) and positively associated with nighttime (rs = 0.316, P = 0.021). Significant main effects of tympanic temperature (P < 0.001), day of the competition (P = 0.018), and a tympanic temperature ∗ day of competition interaction (P < 0.001) were used to predict minor lapses in attention. No associations between melatonin levels and cognitive function were observed (P > 0.05). During the event tympanic temperature declined and was associated with an increase in lapses in attention. With sustained endurance events becoming more popular future research is warranted to evaluate the physiological impact of participation.

Show MeSH
Related in: MedlinePlus