Table 2.
The energy cost of activities, or metabolic equivalents (METS; kcal·kg−1·week−1) in participants ingesting vitamin C (1000 mg) or placebo daily for eight weeks. The data are averaged at two-week intervals and presented as the mean value; the percent increase from baseline with 95% CI; and the treatment effect *.
| METS | Vitamin C (n = 15) | Placebo (n = 13) | Treatment effect | p [η2] |
|---|---|---|---|---|
| Week 1–2 | ||||
| Mean ± SD | 68 ± 32 | 44 ± 25 | ||
| Average increase | 28.8% | 21.3% | +7.5% | 0.7 |
| [95% CI] | [−3.7, 61.3] | [−13.6, 56.2] | [−40.1, 55.2] | [0.00] |
| Week 3–4 | ||||
| Mean ± SD | 66 ± 27 | 42 ± 25 | ||
| Average increase | 21.0% | 14.8% | +6.2% | 0.8 |
| [95% CI] | [−3.9, 45.8] | [−11.9, 41.5] | [−30.3, 42.6] | [0.01] |
| Week 5–6 | ||||
| Mean ± SD | 84 ± 41 | 46 ± 25 | ||
| Average increase | 51.4% | 30.1% | +21.2% | 0.3 |
| [95% CI] | [20.8, 82.0] | [−2.7, 63.0] | [−23.7, 66.1] | [0.04] |
| Week 7–8 | ||||
| Mean ± SD | 86 ± 39 | 43 ± 20 | ||
| Average increase | 60.2% | 20.5% | +39.6% | 0.10 |
| [95% CI] | [30.1, 90.2] | [−11.7, 52.8] | [−4.5, 83.7] | [0.12] |
* p for Univariate analysis; η2 = partial eta squared effect size.