![]() At this time, however, the only side effect directly associated with Cr supplementation is weight gain. Numerous anecdotal reports have associated muscle cramping, spasm, strains, gastrointestinal distress, kidney dysfunction, and heat illness with Cr supplementation. 4, 13, 14 However, not all the findings support ergogenic claims. Anecdotal reports of ergogenic value have been supported by scientifically controlled studies investigating its effects on strength, 5 – 8 power, 8 – 11 speed, 12 and fatigue. 1 – 4 The theory behind its use is similar to that of carbohydrate loading, because an increased muscle Cr content would conceivably enhance the capacity of the phosphagen energy system, providing greater resistance to fatigue and improving performance. Studies have shown that muscle Cr and phosphocreatine can be significantly elevated when a normal diet is supplemented with Cr. Creatine (Cr) supplementation continues to be extremely popular as a potential ergogenic aid among athletes at all levels. ![]()
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