scholarly journals Exogenous Testosterone Increases Decoy Effect in Healthy Males

2018 ◽  
Vol 9 ◽  
Author(s):  
Jiajun Liao ◽  
Yang Zhang ◽  
Yingchun Li ◽  
Hong Li ◽  
Samuele Zilioli ◽  
...  
Keyword(s):  
Decoy Effect ◽  
Healthy Males

Caffeine and Placebo Expectation

2007 ◽  
Vol 21 (2) ◽  
pp. 91-99 ◽  
Author(s):  
Yunfeng Sun ◽  
Yinling Zhang ◽  
Ning He ◽  
Xufeng Liu ◽  
Danmin Miao
Keyword(s):  
Blood Pressure ◽  
Heart Rate ◽  
Sleep Deprivation ◽  
Cognitive Performance ◽  
Cognitive Functions ◽  
Cardiovascular Regulation ◽  
Double Blind ◽  
Positive Effects ◽  
Pressure Tests ◽  
Healthy Males

Abstract. Caffeine placebo expectation seems to improve vigilance and cognitive performance. This study investigated the effect of caffeine and placebo expectation on vigilance and cognitive performance during 28 h sleep deprivation. Ten healthy males volunteered to take part in the double-blind, cross-over study, which required participants to complete five treatment periods of 28 h separated by 1-week wash-out intervals. The treatments were no substance (Control); caffeine 200 mg at 00:00 (C200); placebo 200 mg at 00:00 (P200); twice caffeine 200 mg at 00:00 and 04:00 (C200-C200); caffeine 200 mg at 00:00 and placebo 200 mg at 04:00 (C200-P200). Participants were told that all capsules were caffeine and given information about the effects of caffeine to increase expectation. Vigilance was assessed by a three-letter cancellation test, cognitive functions by the continuous addition test and Stroop test, and cardiovascular regulation by heart rate and blood pressure. Tests were performed bihourly from 00:00 to 10:00 of the second day. Results indicated that C200-P200 and C200-C200 were more alert (p < .05) than Control and P200. Their cognitive functions were higher (p < .05) than Control and P200. Also, C200-P200 scored higher than C200 in the letter cancellation task (p < .05). No test showed any significant differences between C200-P200 and C200-C200. The results demonstrated that the combination of caffeine 200 mg and placebo 200 mg expectation exerted prolonged positive effects on vigilance and cognitive performance.

Reflex ocular torsion in healthy males.

1958 ◽  
Author(s):  
Richard C. Woellner ◽  
Ashton Graybiel
Keyword(s):  
Ocular Torsion ◽  
Healthy Males

Testing the similarity-substitution hypothesis for the phantom decoy effect

2002 ◽  
Author(s):  
Jonathan C. Pettibone ◽  
Douglas H. Wedell ◽  
Deborah Zeitlin
Keyword(s):  
Decoy Effect

The Basis for the Increase in Factor VIII Procoagulant Activity During Exercise

1983 ◽  
Vol 49 (01) ◽  
pp. 053-057 ◽  
Author(s):  
Robert G Kopitsky ◽  
Mary Ellen P Switzer ◽  
R Sanders Williams ◽  
Patrick A McKee
Keyword(s):  
Factor Viii ◽  
Acute Exercise ◽  
Post Exercise ◽  
Fviii Activity ◽  
Plasma Factor ◽  
The Subject ◽  
Von Willebrand ◽  
Willebrand Factor ◽  
Healthy Males ◽  
Related Increase

SummaryWe studied the effect of acute exercise on the ability of thrombin to activate plasma factor VIII (FVIII) activity in 20 healthy males. The subject showed an average exercise-related increase in FVIII activity of 54.5±8.2% over pre-exercise FVIII activity (p<0.001). When exposed to the same concentration of thrombin, post-exercise FVIII activity showed greater enhancement than pre-exercise FVIII activity: 157.1±12.8% increase in activity versus 117.3±9.9%, respectively (p<0.01). The degree of the potentiated thrombin effect in post-exercise samples relative to pre-exercise samples was linearly correlated with the degree of the exercise-related increase in FVIII activity. Taken together with our previous observations that the extent of thrombin enhancement of FVIII activity varies inversely with the mole ratio of FVIII/von Willebrand factor subunits to thrombin, these findings imply that release of FVIII does not occur during exercise, and that the exercise-related increase in FVIII activity results primarily, if not completely, from activation of already circulating but inactive FVIII.

The influence of intravenous midazolam application on prolactin and hGH levels in healthy males

1988 ◽  
Vol 117 (4_Suppl) ◽  
pp. S117-S118 ◽  
Author(s):  
M. SYDOW ◽  
T.A. CROZIER ◽  
W. WUTTKE ◽  
P. STUBBE ◽  
D. KETTLER
Keyword(s):  
Healthy Males
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