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A relatively new innovation in sports nutrition is the use of nutritional supplements during training in the form of intra-workout drinks.
Intra-workout supplements commonly feature either branched chain amino acids, essential amino acids or short chain peptides derived from hydrolyzed whey protein. The use of these is for their rapid absorption and the fact the body has a high requirement for essential amino acids, especially BCAA's during training. Advocates of intra-workout supplements argue by supplying these critical constituents of muscle tissue during a time when blood flow to working muscles and muscle tissue breakdown is at a high level, trainees can have faster intra-set recovery as well as faster recovery and less soreness the day after training.
In addition, many intra-workout supplements will include nutrients such as beta alanine (for improving muscle endurance), citrulline malate (a nitric oxide precursor and ergogenic aid particularly for aerobic activity) or nootropic complexes to enhance mood and combat stress. Anecdotal feedback suggests these products can be effective particularly for advanced athletes.