I have no idea if it is true...but it is interesting.
The study had several aspects that challenge its relevance to bodybuilding...
1) Exercise protocol isn't directly applicable:
"The exercise consisted of three consecutive maximal isometric contractions and three interval series of 90, 80, and 50 maximal voluntary contractions performed with a rest interval of 2 min between the series."
50-90 reps per set (1st series done isometrically), nah. not applicable to BB.
2) The protocol was carried out after a 6 day loading phase. This means that if caffeine indeed interfered with the creatine loading process, then it would simply be a matter of time (perhaps another week or so) before the creatine + caffeine group's creatine stores became saturated & thus on a level playing field with the creatine only group.
3) The study is over 10 years old & its results haven't been replicated. In essence, it's a one-hit wonder to be taken with a grain of salt.
4) In habitual caffeine users, you're already starting at baseline by virtue of your body being accustomed to caffeine. Therefore, any potential antagonism between creatine & caffeine would be minimal. But again, once your tissue stores are saturated with creatine @ appx 160 mmol/kg, I doubt any amount of caffeine would negatively influence performance, because you're already loaded.
