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Heat-Killed Probiotic Strain May Help Athletes Beat Common ColdsWhether training for a marathon or trying to score for your community soccer team, the common cold can slow down even the most tenacious athlete. Luckily, a study found that a supplement made with a heat-killed preparation of a probiotic bacteria known as Lactococcus lactis JCM 5805 may reduce the symptoms of colds and fatigue related to high-intensity exercise by activating dendritic cells. Dendritic cells are a type of immune cell that help initiate the response to infection. Published in the Journal of the International Society of Sports Nutrition, the double-blind trial included 51 men belonging to a university sports club. Every day for 13 days, half the men took capsules containing 100 billion heat-killed L. lactis bacteria and the other half took a placebo containing cornstarch. During that time, the men performed high-intensity exercises with their sports club and recorded their physical conditions, including any cold symptoms, in a diary. Researchers took blood and saliva samples on days 1 and 14 to measure markers of muscle damage and stress. At the end of the study, they found that:
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