Table 2 |
|||
|
Strength of pairwise associations between performance enhancing reasons to use and type of supplements used. |
|||
| Nutritional supplementsa |
Maintain strength |
Enhance endurance |
Able to train longer |
|
|
|||
| Vitamin C |
χ2 = 6.430 |
||
| NA |
NA |
ϕ = .126 |
|
| (.011) |
|||
| Iron |
χ2 = 5.275 |
||
| NA |
ϕ = .115 |
NA |
|
| (.022) |
|||
| Ginsengb |
χ2 = 4.518 |
||
| NA |
NA |
ϕ = .106 |
|
| (.034) |
|||
| Whey protein |
χ2 = 94.355 |
χ2 = 12.723 |
|
| ϕ = .484 |
NA |
ϕ = .178 |
|
| (< .001) |
(< .001) |
||
| Caffeine |
χ2 = 11.170 |
χ2 = 2.536 |
|
| NA |
ϕ = 0.167 |
ϕ = .079 |
|
| (.001) |
(.111) |
||
| Creatine |
χ2 = 80.327 |
||
| ϕ = .447 |
NA |
NA |
|
| (< .001) |
|||
| Energy drinks |
NA |
χ2 = 44.895 |
χ2 = 19.224 |
| ϕ = .334 |
ϕ = .129 |
||
| (< .001) |
(< .001) |
||
|
|
|||
|
a melatonin excluded from the analysis owing to insufficient data (n = 4); performance enhancing effect is not expected for multivitamin and echinacea b expected association from anecdotal effect. |
|||
|
Petróczi et al. Journal of the International Society of Sports Nutrition 2008 5:22 doi:10.1186/1550-2783-5-22 |
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