The effects of acute dopamine reuptake inhibition on cognitive function during passive hyperthermia

2020 ◽  
Author(s):  
Phillip J. Wallace ◽  
Ricardo S Martins ◽  
Jake S Scott ◽  
Scott W Steele ◽  
Matthew Greenway ◽  
...  
Keyword(s):  
Heat Stress ◽  
Executive Function ◽  
Cognitive Function ◽  
Thermal Strain ◽  
Maze Learning ◽  
Test Battery ◽  
Cognitive Test ◽  
Set Shifting ◽  
Heart Rates ◽  
The Impact

Dopamine activity can modulate physical performance in the heat, but less is known about its effects on cognition during thermal stress. Twelves males completed a randomized, double-blinded protocol consisting of oral ingestion of 20 mg of methylphenidate (MPH) or placebo (lactose pill) during passive heating using a water-perfused suit (water temperature ~49°C). To identify the impact of peripheral versus central thermal strain, a cognitive test battery was completed at four different thermal states: baseline (BASE; 37.2±0.6˚C core, 32.9±0.7˚C skin), neutral core-hot skin (NC-HS; 37.2±0.3˚C, 37.4±0.3˚C), hyperthermic core-hot skin (HC-HS; 38.7±0.4˚C, 38.7±0.2˚C), and hyperthermic core-cooled skin (HC-CS; 38.5±0.4˚C, 35.1±0.8˚C). The cognitive test battery consisted of the 2-back task (i.e. working memory), set-shifting (i.e. executive function), Groton Maze Learning Task (i.e. executive function) and detection task (i.e. psychomotor processing). MPH led to significantly higher heart rates (~5-15 b·min-1) at BASE, NC-HS, and HC-HS (all p<0.05). There were no significant differences in the number of errors made on each task (all p<0.05). Participants were significantly faster (p<0.05) on the set-shifting task in the HC-HS timepoint, irrespective of drug condition (p>0.05). In summary, we demonstrated that 20 mg of MPH did not significantly alter cognitive function during either normothermia or moderate hyperthermia. Novelty: ● 20 mg of MPH did not significantly alter cognitive function during passive heat stress ● MPH led to significant higher heart rates (~5-15 bmin-1) in thermoneutral and during passive heat stress ● Future studies are needed to determine the mechanisms of why MPH improves physical but not cognitive performance during heat stress

scholarly journals Serum sodium in relation to various domains of cognitive function in the elderly US population

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Sohyae Lee ◽  
Jin-young Min ◽  
Beom Kim ◽  
Sang-Won Ha ◽  
Jeohng Ho Han ◽  
...  
Keyword(s):  
Executive Function ◽  
Cognitive Function ◽  
Serum Sodium ◽  
Verbal Memory ◽  
The Elderly ◽  
Cognitive Change ◽  
Cognitive Test ◽  
P Value ◽  
Digit Symbol Substitution Test ◽  
Cross Sectional

Abstract Background Recent evidence suggests that sodium imbalances may be associated with cognitive impairment; however, the association between specific domains of cognition remains unclear. This study examines the association between serum sodium levels and immediate and delayed verbal memory as measured by the CERAD Word Learning Test (CERAD WLT), executive function as measured by the Animal Fluency test (AFT), and sustained attention, working memory, and processing speed as measured by the Digit Symbol Substitution test (DSST) in the elderly population of the US aged 60 and older who participated in the 2011–2014 National Health and Nutrition Examination Surveys (n = 2,541). Methods Cognitive function tests were performed by trained interviewers and sodium levels were measured using indirect ion selective electrode methodology. Results After adjusting for all covariates, quintiles of CERAD WLT scores showed significant positive associations with log-transformed sodium levels (Immediate recall (IR) β = 4.25 (SE = 1.83, p-value 0.027); Delayed recall (DR) β = 6.54 (SE = 1.82, p-value 0.001)). Compared to normal sodium levels, hyponatremia was significantly associated with lower CERAD WLT-IR (β = -0.34, SE = 0.15, p-value 0.035) and CERAD WLT-DR scores (β -0.48, SE = 0.10, p-value < 0.001) and showed borderline significance with AFT scores (β = = -0.38, SE = 0.19, p-value 0.052). Hypernatremia did not show any significant relationships with cognitive test scores, compared to normal sodium levels. Conclusions Our cross-sectional study showed that lower sodium levels were associated with cognitive change, especially regarding memory and executive function.

scholarly journals Concussion History and Cognitive Function in a Large Cohort of Adolescent Athletes

2018 ◽  
Vol 46 (13) ◽  
pp. 3262-3270 ◽  
Author(s):  
Kathryn M. Taylor ◽  
Marianthi-Anna Kioumourtzoglou ◽  
Jim Clover ◽  
Brent A. Coull ◽  
Jack T. Dennerlein ◽  
...  
Keyword(s):  
High School ◽  
Cognitive Function ◽  
Verbal Memory ◽  
Impulse Control ◽  
Visual Memory ◽  
Test Battery ◽  
Cognitive Test ◽  
Effect Estimate ◽  
Cognitive Score ◽  
And Performance

Background: The incidence of reported concussions in the adolescent population is increasing, yet research on the effects of concussions in this population is minimal and inconclusive. Purpose: To assess the association between concussion and performance on a cognitive test battery. Study Design: Cross-sectional study; Level of evidence, 3. Methods: Using multivariate models, the authors assessed the association between concussion and performance on a cognitive test battery among 5616 high school and junior high school athletes. The researchers utilized a global cognitive score and scores for 5 domains: verbal memory, visual memory, visual motor, reaction time, and impulse control. Each cognitive score was converted to a z score with the mean and SD of the nonconcussed population. Results from each model were then interpreted as change in the standardized unit score. In the models, concussion was evaluated as ever having a concussion, number of concussions, time since last concussion, and age at first concussion. Results: Ever having a concussion was associated with a mean decrease of 0.11 standardized units (95% CI, −0.20 to −0.01) on the global cognitive score and lower scores in all cognitive domains. Each additional concussion was associated with lower scores on global cognitive function (effect estimate, −0.06; 95% CI, −0.11 to −0.02), verbal memory, visual memory, and impulse control. Concussion in early childhood was associated with lower global cognition (effect estimate, −0.05; 95% CI, −0.08 to −0.01), visual memory, and motor visual scores as compared with concussions in later childhood. The associations between time since last concussion and cognitive test scores were nonlinear, and on all tests, lower scores were observed even ≥1 year after the concussion. Conclusion: On the basis of objective performance metrics for cognitive function, concussions had a more persistent effect on cognitive function than previously thought. The age at which an individual has his or her first concussion may be an important factor in determining long-lasting cognitive effects.

Abstract P268: Greater Cognitive Impairment Among Older Adults With Type 1 Diabetes as Compared to Non-diabetic Controls: Results From the Study of Longevity in Diabetes (SOLID)

Circulation ◽  
2020 ◽  
Vol 141 (Suppl_1) ◽  
Author(s):  
Mary E Lacy ◽  
Paola Gilsanz ◽  
Chloe Eng ◽  
Michal S Beeri ◽  
Andrew J Karter ◽  
...  
Keyword(s):  
Older Adults ◽  
Type 1 Diabetes ◽  
Cognitive Impairment ◽  
Executive Function ◽  
Cognitive Function ◽  
Episodic Memory ◽  
Regression Models ◽  
Cognitive Test ◽  
Race Ethnicity

Introduction: Studies have shown poorer cognitive function in children and adolescents with type 1 diabetes (T1D) as compared to non-diabetic peers. However, little is known about cognitive function in older adults with T1D. Hypothesis: We hypothesized that older adults with T1D and type 2 diabetes (T2D) would have greater cognitive impairment than age, sex, race/ethnicity, and education-matched controls without diabetes. Methods: We compared baseline cognitive impairment among older adults (aged ≥60) from the Study of Longevity in Diabetes (SOLID) with T1D (n=771), T2D (=234) and no diabetes (n=253). Cognitive tests assessed three cognitive domains identified via factor analysis (language, executive function, episodic memory). All cognitive test scores were standardized and cognitive impairment was defined as 1.5 SD below the mean. In logistic regression models adjusted for age, sex, education, and race/ethnicity, we examined the association between diabetes status (T1D, T2D or no diabetes) and cognition on each cognitive domain and on global cognition (average of scores on the 3 domains). Results: In adjusted regression models, compared to older adults without diabetes, those with T1D were more likely to have impaired cognitive function on the language (OR=2.13, 95% CI: 1.08, 4.17) and executive function domains (OR=2.66, 95% CI: 1.36, 5.22). No significant differences in global cognitive impairment or impairment on the episodic memory domain were observed for T1D and no significant differences on any domain were observed for T2D. Conclusions: Our findings suggest that older adults with T1D have greater cognitive impairment than their peers without diabetes; findings were specific to the language and executive function domains, with episodic memory being unaffected. No increase in cognitive impairment was observed for older adults with T2D. Additional research is needed to understand the causes and potentially modifiable factors associated with impaired cognition among older adults with T1D.

scholarly journals Prospective Associations of Erythrocyte Composition and Dietary Intake of n-3 and n-6 PUFA with Measures of Cognitive Function

Nutrients ◽  
2018 ◽  
Vol 10 (9) ◽  
pp. 1253 ◽  
Author(s):  
Sherman Bigornia ◽  
Tammy Scott ◽  
William Harris ◽  
Katherine Tucker
Keyword(s):  
Cognitive Impairment ◽  
Executive Function ◽  
Cognitive Function ◽  
Dietary Intake ◽  
Puerto Rican ◽  
Cognitive Domain ◽  
Health Study ◽  
Individual Species ◽  
Dietary Pufa ◽  
The Impact

Polyunsaturated fatty acid (PUFA) consumption is recommended as part of a healthy diet, but evidence of the impact of individual species and biological concentrations on cognitive function is limited. We examined prospective associations of PUFA erythrocyte composition and dietary intake with measures of cognitive function among participants of the Boston Puerto Rican Health Study (aged 57 years). Erythrocyte and dietary PUFA composition were ascertained at baseline and associated with 2-year scores on the Mini-Mental State Exam (MMSE) (n = 1032) and cognitive domain patterns derived from a battery of tests (n = 865), as well as with incidence of cognitive impairment. Erythrocyte and dietary n-3 PUFA were not significantly associated with MMSE score. However, total erythrocyte and dietary n-3 very-long-chain fatty acids (VLCFA), and intake of individual species, were associated with better executive function (P-trend < 0.05, for all). There was evidence that greater erythrocyte n-6 eicosadienoic acid concentration was associated with lower MMSE and executive function scores (P-trend = 0.02). Only erythrocyte arachidonic acid (ARA) concentration predicted cognitive impairment (Odds Ratio = 1.26; P = 0.01). Among Puerto Rican adults, we found that n-3 VLCFA consumption may beneficially impact executive function. Further, these findings provide some evidence that n-6 metabolism favoring greater ARA tissue incorporation, but not necessarily dietary intake, could increase the risk of cognitive impairment.

scholarly journals Serum Sodium in Relation to Various Domains of Cognitive Function in the Elderly US Population

2020 ◽  
Author(s):  
Sohyae Lee ◽  
Jin-young Min ◽  
Beom Kim ◽  
Sang-Won Ha ◽  
Jeohng Ho Han ◽  
...  
Keyword(s):  
Executive Function ◽  
Cognitive Function ◽  
Serum Sodium ◽  
Verbal Memory ◽  
The Elderly ◽  
Cognitive Change ◽  
Cognitive Test ◽  
P Value ◽  
Digit Symbol Substitution Test ◽  
Cross Sectional

Abstract Background:Recent evidence suggests that sodium imbalances may be associated with cognitive impairment; however, the association between specific domains of cognition remains unclear. This study examines the association between serum sodium levels and immediate and delayed verbal memory as measured by the CERAD Word Learning Test (CERAD WLT), executive function as measured by the Animal Fluency test (AFT), and sustained attention, working memory, and processing speed as measured by the Digit Symbol Substitution test (DSST) in the elderly population of the US aged 60 and older who participated in the 2011–2014 National Health and Nutrition Examination Surveys (n=2,700). Methods:Cognitive function tests were performed by trained interviewers and sodium levels were measured using indirect ion selective electrode methodology. Results:After adjusting for all covariates, CERAD WLT scores showed significant positive associations with sodium levels (Immediate recall (IR) β = 0.11 (SE = 0.04, p-value 0.018); Delayed recall (DR) β = 0.07 (SE = 0.03, p-value 0.009)). Compared to individuals with normal sodium levels, individuals with hyponatremia were significantly associated with lower CERAD WLT-DR (β = -0.71, SE = 0.23, p-value 0.005) and AFT scores (β = -1.58, SE = 0.68, p-value 0.027), and showed a borderline significant relationship with lower CERAD WLT-DR scores (β = -1.11, SE = 0.56, p-value 0.057). Individuals with hypernatremia did not show any significant relationships with cognitive test scores, compared to those with normal sodium levels. Conclusions:Our cross-sectional study showed that lower sodium levels were associated with cognitive change, especially regarding memory and executive function.

Abstract T P415: Assessment Of Cognitive Symptoms In Sub-acute Stroke With An iPad Test-battery

Stroke ◽  
2015 ◽  
Vol 46 (suppl_1) ◽  
Author(s):  
Lasse Willer ◽  
Palle M Pedersen ◽  
Anders Gullach ◽  
Hysse B Forchhammer ◽  
Hanne K Christensen
Keyword(s):  
Executive Function ◽  
Acute Stroke ◽  
Time Course ◽  
Test Battery ◽  
Mean Difference ◽  
Cognitive Testing ◽  
Cognitive Test ◽  
Cognitive Symptoms ◽  
Stroke Patients ◽  
Attention Span

Introduction and hypothesis: Research into the time-course of cognitive symptoms in stroke as well as planning of rehabilitation is dependent on reliable and sensitive cognitive testing. Usually, it is not possible to have all patients seen by a neuropsychologist. Moreover, a battery for stroke patients poses special challenges as symptoms like aphasia, hemineglect and hemiplegia may exclude many patients from performing a number of traditionally employed test methods. Finally, the battery has to be performed in a short timespan because many patients are easily fatigued. Method: We developed a battery comprising tests for anosognosia, aphasia, neglect, depression, episodic memory, attention span, working memory, mental speed, manual motor speed, and executive function (response inhibition). We present data from sub-acute stroke patients and age-matched controls. Both groups were tested twice with a 3 month interval in order to: 1) assess the proportion of patients able to perform the different tests; 2) determine the typical time needed to do the testing; 3) demonstrate the sensitivity to cognitive symptoms in sub-acute stroke Results: 51 stroke patients 43 healthy controls were included. 49 patients (96%) were able to do at least one test and 41 (80%) were able to do all tests. Mean duration for the testing of sub-acute stroke patients was 39 minutes (range 30-60 minutes). Mean Age 67 years (patients 65 and controls 69, range 33-90). Mean verbal fluency correct in 1st session: patients 29.2 and Controls 45.3; Mean difference 16.03, 95%CI (10.1-22.0) p 〈0.001. Mean change in patients from 1st to 2nd Session: 6.2, 95%CI(1.2-11.2) p=0.017. Mental speed by coding: patients 29.3 and controls 45.7; mean difference 16.4, 95% CI(10.3-22.4) p〈0.001. Similar analysis of memory, attention span, and executive function showed significant differences between control and patient groups as well as in patients from 1st to 2nd session. Conclusion: Our cognitive test-battery for iPad can be used with most stroke patients in the sub-acute phase. It can be performed in a relatively short time span. It is sensitive to cognitive reduction after stroke and remission of symptoms.

The impact of heat stress on performance and cognitive function during simulated laparoscopic surgical tasks

2012 ◽  
Vol 215 (3) ◽  
pp. S118 ◽  
Author(s):  
Regan James Berg ◽  
Kenji Inaba ◽  
Maura Sullivan ◽  
Obi Okoye ◽  
Michael Minneti ◽  
...  
Keyword(s):  
Heat Stress ◽  
Cognitive Function ◽  
The Impact

The impact of heat stress on operative performance and cognitive function during simulated laparoscopic operative tasks

Surgery ◽  
2015 ◽  
Vol 157 (1) ◽  
pp. 87-95 ◽  
Author(s):  
Regan J. Berg ◽  
Kenji Inaba ◽  
Maura Sullivan ◽  
Obi Okoye ◽  
Stefano Siboni ◽  
...  
Keyword(s):  
Heat Stress ◽  
Cognitive Function ◽  
Operative Performance ◽  
The Impact

Similar Thermal Strain Reductions and Cognitive Function with Age and Air Velocity during Heat Stress

2014 ◽  
Vol 46 ◽  
pp. 879
Author(s):  
Heather E. Wright-Beatty ◽  
Stephen G. Hardcastle ◽  
Jocelyn M. Keillor ◽  
Joanie Larose ◽  
Pierre Boulay ◽  
...  
Keyword(s):  
Heat Stress ◽  
Cognitive Function ◽  
Thermal Strain ◽  
Air Velocity

scholarly journals Exercise under heat stress: thermoregulation, hydration, performance implications and mitigation strategies

2021 ◽  
Author(s):  
Julien D. Periard ◽  
Thijs M.H. Eijsvogels ◽  
Hein A.M. Daanen
Keyword(s):  
Heat Stress ◽  
Exercise Performance ◽  
Thermal Strain ◽  
Mitigation Strategies ◽  
Body Core Temperature ◽  
Aerobic Performance ◽  
Future Research ◽  
Hydration Status ◽  
Fatigue Development ◽  
The Impact

A rise in body core temperature and loss of body water via sweating are natural consequences of prolonged exercise in the heat. This review provides a comprehensive and integrative overview of how the human body responds to exercise under heat stress and the countermeasures that can be adopted to enhance aerobic performance under such environmental conditions. The fundamental concepts and physiological processes associated with thermoregulation and fluid balance are initially described, followed by a summary of methods to determine thermal strain and hydration status. An outline is provided on how exercise-heat stress disrupts these homeostatic processes, leading to hyperthermia, hypohydration, sodium disturbances and in some cases exertional heat illness. The impact of heat stress on human performance is also examined, including the underlying physiological mechanisms that mediate the impairment of exercise performance. Similarly, the influence of hydration status on performance in the heat and how systemic and peripheral hemodynamic adjustments contribute to fatigue development is elucidated. This review also discusses strategies to mitigate the effects of hyperthermia and hypohydration on exercise performance in the heat, by examining the benefits of heat acclimation, cooling strategies and hyperhydration. Finally, contemporary controversies are summarized and future research directions provided.

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