Bifidobacterium breve is a species of lactic acid-producing bacteria that is naturally found in the human gastrointestinal (GI) tract. Bifidobacterium breve is used commercially as a probiotic—beneficial bacteria that help maintain the health of the intestinal tract, aid digestion and assist in nutrient absorption.* Probiotics can be found in some food sources, such as yogurt, and they can also be consumed as dietary supplements. Bifidobacterium breve seems to be well-tolerated when consumed by most people. No adverse effects from Bifidobacteria ingestion have been reported 1.
In a randomized, double-blind, placebo controlled, crossover trial, 15 healthy resistance-trained men ingested daily for three weeks a placebo or an encapsulated probiotic supplement containing Streptococcus thermophilus and Bifidobacterium breve (5 billion live cells each) prior to muscle-damaging exercise. Isometric strength, muscle soreness, range of motion and girth, and blood interleukin-6 (IL-6) and creatine kinase (CK) concentrations were measured from pre- to 72 h post-exercise. Probiotic supplementation resulted in an overall decrease in circulating IL-6, which was sustained up to 48 h post-exercise. In addition, probiotic supplementation likely enhanced isometric average peak torque production at 24 to 72 h into the post-exercise recovery period and likely moderately increased resting arm angle at 24 and 48 h post-exercise, but effects on soreness and flexed arm angle and CK were unclear2.