The Stability of Psychometric Performance during the International Biomedical Expedition to the Antarctic (IBEA)

Defayolle, M; Boutelier, C; Bachelard, Claude; Rivolier, J; Taylor, A. J. W.

doi:10.1080/0097840x.1985.9936753

Cited by 23 publications

(6 citation statements)

References 4 publications

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“…This is also in agreement with previous studies in the Antarctic (35), and may indicate a pattern of cold acclimation where the initial increase in catecholamines in response to cold exposure eventually returns to baseline (36,37). Patterns of mood and cognitive performance in this study were consistent with some (38,39), documenting an absence of significant decrements of cognitive performance and a seasonal pattern of decrements in mood (21,40,41). The comparison to placebo with effect of treatment and season shows for the first time in our review that tyrosine intervention results in higher fT 3 and lower serum TSH in winter compared with placebo but not different that the combined T 4 -T 3 supplement.…”

Section: Discussionsupporting

confidence: 82%

Psychoneuroendocrine effects of combined thyroxine and triiodothyronine versus tyrosine during prolonged Antarctic residence

Palinkas

Reedy

Smith

et al. 2007

International Journal of Circumpolar Health

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Objectives. We previously reported that cognitive function improves with thyroxine and that there is a circannual pattern to mood and human TSH during Antarctic residence. To extend these findings, we examined the effects of tyrosine and a combined levothyroxine/ liothyronine supplement in euthyroid men and women who spent the austral summer (n=43) and/or winter (n=42) in Antarctica. Study Design. Randomized, placebo-controlled, clinical trial. Methods. Subjects were randomized to receive the following each day for 91.6±3.2 days in summer and/or 138.0± 3.2 days in winter: (1) 12g tyrosine mixed in 113g applesauce; (2) 50ug of levothyroxine and 12.5ug of liothyronine (T4-T3 Supplement); or (3) placebo. Cognitive performance and mood were assessed using the Automatic Neuropsychological Assessment Metric -Isolated and Confined Environments. Effectiveness of thyroid supplement and tyrosine in Antarctica Results. With placebo in summer, mood did not change while TSH decreased by 28%; in winter, there was a 136% degradation in mood (p<0.01) and TSH increased by 18%. With combined T4-T3 supplement, there was a 51% degradation in mood in summer compared with placebo (p<0.05) and TSH decreased by 57%; in winter there was a 135% degradation in mood while TSH was reduced by 26% (p<0.05). Tyrosine use in summer was associated with no change in mood and a 30% decline in TSH, while in winter there was a 47% improvement in mood and TSH decreased by 28% along with a 6% increase in fT3 (p<0.05). Conclusions. Administration of tyrosine leads to a significant reduction in serum TSH and improvement in mood in winter compared with placebo, while the combined T4-T3 supplement leads to a worsening of mood in summer and no improvement in winter. There appears to be a seasonal influence on the psychological response to interventions and the relationship to changes in TSH reductions. (Int J Circumpolar Health 2007; 66(5):401-417)

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Section: Discussionsupporting

confidence: 82%

Psychoneuroendocrine effects of combined thyroxine and triiodothyronine versus tyrosine during prolonged Antarctic residence

Palinkas

Reedy

Smith

et al. 2007

International Journal of Circumpolar Health

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“…On the other hand, HA was a big environmental stressor for PMVOs, so HA group had higher mental load which resulted in better performance. Similar phenomenon was also found among people working in other extreme environments, such as Antarctic expeditioners [35].…”

Section: Discussionsupporting

confidence: 73%

The Influence of Prolonged High Altitude Deployment on Psychomotor Functions Among Chinese Military Plateau Motor Vehicle Operators: Does Deployment Duration Matter?

Peng

et al. 2020

Preprint

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Background:Psychomotor functions are necessary for Chinese military plateau motor vehicle operators (PMVOs) to complete their driving tasks. This study aimed to investigate (1) the influence of chronic exposure to high altitude (HA) on psychomotor functions among PMVOs; (2) whether deployment duration at HA moderated the effect of HA.Methods: 196 male PMVOs in Golmud (average altitude: 2,890 m) and 192 male lowland motor vehicle operators (LMVOs) were recruited as the studygroup (HA group) and control group (LA group). Both groups were in turn categorized into 3 groups by deployment duration: Group A (less than 1 year), Group B (between 1 year and 2 years), and Group C (more than 2 years). All participants completed simple reaction time, bimanual coordination test, fine motor dexterity test, and eye-hand coordination test. Between-altitude and deployment duration differences were explored usinganalysis of variance (ANOVA).Results: HA group participants had slower simple reaction time in comparison to LA group (F(1, 387) = 18.041, p< 0.001, ηp2 = 0.045).HA group needed less time to complete the bimanual coordination test (F(1, 387) = 2295.648, p< 0.001, ηp2 = 0.857). HA group had more error times in fine motor dexterity test (F(1, 387) = 5.980, p = 0.015, ηp2 = 0.015). HA group participants had better left aim index (F(1, 387) = 13.205, p< 0.001, ηp2 = 0.033) and more right hits (F(1, 387) = 3.916, p = 0.049, ηp2 = 0.010) in aiming test. The interaction effect of altitude and duration was significant on hit number with left hand in the tapping test (F(2, 387) = 3.327, p = 0.037, ηp2 = 0.017). Butsimple effect analysis showed that the effect of duration was not significant among HA group (p = 0.129).Conclusions: In this study, we found that prolonged exposure to HA may cause psychomotor slowing and declining fine motor dexterity. But, the moderating effect of deployment duration was not supported by this study.

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“…The recognized winter-over syndrome includes a reversible decline in cognition [ 6 ]. However, not all Antarctic studies observed cognitive impairments [ 40 , 41 ] and not all winter crews develop the winter-over syndrome. All our tests examined low-level visuospatial and mathematical, cognitive functions.…”

Section: Discussionmentioning

confidence: 99%

Exercise in Isolation- A Countermeasure for Electrocortical, Mental and Cognitive Impairments

et al. 2015

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IntroductionMental impairments, including deterioration of mood and cognitive performance, are known to occur during isolation and space missions, but have been insufficiently investigated. Appropriate countermeasures are required, such as exercise, which is known to prevent mood disorders for prolonged space and isolation missions. Based on the interaction of brain activity, mood and cognitive performance, this study aims to investigate the effect of long-term isolation and confinement and the long-term effect of exercise on these parameters.MethodsEight male volunteers were isolated and confined for about eight month during the winter period at the Antarctic Concordia Station. Every six weeks electroencephalographic measurements were recorded under rest conditions, and cognitive tests and a mood questionnaire were executed. Based individual training logs, subjects were afterwards separated into an active (> 2500 arbitrary training units/interval) or inactive (< 2500 arbitrary training units/interval) group.ResultsA long-term effect of exercise was observed for brain activity and mood. Regularly active people showed a decreased brain activity (alpha and beta) in the course of isolation, and steady mood. Inactive people instead first increased and than remained at high brain activity accompanied with a deterioration of mood. No effect of exercise and isolation was found for cognitive performance.ConclusionThe findings point out the positive effect of regularly performed voluntary exercise, supporting subjective mental well-being of long-term isolated people. The choice to be regularly active seems to support mental health, which is not only of interest for future isolation and space missions.

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The Stability of Psychometric Performance during the International Biomedical Expedition to the Antarctic (IBEA)

Cited by 23 publications

References 4 publications

Psychoneuroendocrine effects of combined thyroxine and triiodothyronine versus tyrosine during prolonged Antarctic residence

Psychoneuroendocrine effects of combined thyroxine and triiodothyronine versus tyrosine during prolonged Antarctic residence

The Influence of Prolonged High Altitude Deployment on Psychomotor Functions Among Chinese Military Plateau Motor Vehicle Operators: Does Deployment Duration Matter?

Exercise in Isolation- A Countermeasure for Electrocortical, Mental and Cognitive Impairments

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