Does caffeine added to carbohydrate provide additional ergogenic benefit for endurance?

@article{Conger2011DoesCA,
  title={Does caffeine added to carbohydrate provide additional ergogenic benefit for endurance?},
  author={S. Conger and Gordon L Warren and Michelle A Hardy and M. Millard-Stafford},
  journal={International journal of sport nutrition and exercise metabolism},
  year={2011},
  volume={21 1},
  pages={
          71-84
        }
}
CONTEXT Carbohydrate (CHO) and caffeine (CAF) both improve endurance performance. PURPOSE To determine by systematic literature review coupled with meta-analysis whether CAF ingested with CHO (CHO+CAF) improves endurance performance more than CHO alone. METHODS Databases were searched using the keywords caffeine, endurance, exercise, carbohydrate, and performance. Criteria for inclusion were studies that used human subjects performing an endurance-exercise performance task and included both… Expand
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When co-ingested with carbohydrate, caffeine increased fat use and decreased nonmuscle glycogen carbohydrate use over carbohydrate alone when participants are in negative energy balance; however, caffeine had no effect on the 20 km cycling time trial performance. Expand
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The results from this meta-analysis confirm the ergogenic effects of caffeine, particularly for endurance testing that use Tlim protocols, particularly in studies that use time-to-exhaustion protocols. Expand
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