Table 2.  Descriptive statistics for study variables and differences between means on supplement and placebo conditions.

N = 37

Mean (±SD)

Min – Max

p-value

General Vitality a

4.50 (1.19)

1.00 – 6.83

  

Reduced  Sense of Accomplishment b

2.49 (.73)

1.00 – 3.60

  

Emotional/Physical Exhaustion b

3.25 (.79)

1.20 – 4.80

  

Devaluation b

2.79 (.97)

1.00 – 4.60

  

N = 34

        

Current Vitality a

Supplement
Placebo

4.21 (1.07)
3.99 (.83)

1.42 – 6.83
2.25 – 6.00

.22

Energetic c

Supplement
Placebo

2.38 (.61)
2.31 (.59)

1.00 – 3.60
1.20 – 4.00

.42

Tiredness c

Supplement
Placebo

2.27 (.71)
2.45 (.66)

1.00 – 3.7 0
1.20 – 4.00

.15

Tension c

Supplement
Placebo

1.64 (.48)
1.62 (.44)

1.00 – 2.70
1.00 – 2.50

.72

Calmness c

Supplement
Placebo

2.32 (.52)
2.44 (.54)

1.40 – 3.60
1.10 – 3.50

.19
a Scores are on a scale of 1 to 7 for the General Vitality Scale and Current Feelings of Vitality Scale.
b Scores are on a scale of 1 to 5 for the Athlete Burnout Questionnaire.
c Scores are on a scale of 1 to 4 for the Activation-Deactivation Adjective Checklist.