Table 1.
Demographic characteristics of study participants.
| Non-exercisers | Exercisers | |
|---|---|---|
| N (male/female) | 30 (7/23) | 81 (35/46) |
| Exercise frequency (times/week) | 0 | 3.5 ± 0.2 |
| RACE (%) | ||
| European American* | 30 | 62 |
| African American | 33 | 17 |
| Other | 37 | 21 |
| Age (years) | 21.8 ± 0.7 | 22.3 ± 0.4 |
| Body mass index (kg/m2) | 22.0 ± 0.4 | 22.2 ± 0.2 |
| CURRENT DRUG USE | ||
| Caffeine (drinks/week) | 8.0 ± 1.8 | 5.9 ± 0.7 |
| Alcohol (drinks/week) | 2.8 ± 0.7 | 4.0 ± 0.4 |
| Cigarettes (per week) | 0.2 ± 0.1 | 1.1 ± 0.6 |
| PERSONALITY | ||
| Positive emotionality | 75.0 ± 2.1 | 74.0 ± 1.7 |
| Negative emotionality | 28.2 ± 2.8 | 26.5 ± 1.6 |
| Constraint | 71.2 ± 3.2 | 70.4 ± 1.9 |
Values indicate mean ± s.e.m. Asterisks indicate a significant difference between the samples (
*
p < 0.05, Chi-squared analysis).