visits conducted with a 24h difference.
10 participants used caffeine; 10 participants placebo
HASKELL C.F. et al (2007)
Double-Blind, Counterbalanced, Placebo- Controlled Study
26 Healthy participants (mean age 21.38; 8 males, 18 females) 5 participants excluded
37.5mg/ 75mg/ 150mg/ 300mg/ guarana capsules
Behavioral and Cognitive effects of Guarana supplementation
1 training session and 5 study days
Each participant was his own control
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Double-Blind, Counterbalanced, Placebo- Controlled Study
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In order to quantify the presence of sleep disturbances, the Athens Insomnia Scale (AIS-8 items) was administered to all the participants. Each item of the scale is rated 0–3 (0: no problem and 3: serious problem). Scores ≥ 6 indicate diagnosis of insomnia
Ahmed Waqas, Aqsa Iftikhar, Zahra Malik, Kapil Kiran Aedma, Hafsa Meraj and Sadiq Naveed
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Self-esteem positively but not significantly correlated with gay-related stressors (r=0.15, p<0.05), with academic stressors (r=0.03, p<0.05), with other life stressors (r=0.15, p<0.05), or with emotional distress (r=0.11, p<0.05)
D’Augelli & Hershberger (1993)
Self-esteem negatively correlated with mental health issues (r=–0.44, p<01
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