Effects of Probiotic (Bacillus subtilis) Supplementation During Offseason Resistance Training in Female Division I Athletes

• Jeremy C. Toohey ^[1] ; Jeremy R. Townsend ^[1] ; Sean B. Johnson ^[1] ; Ann M. Toy ^[1] ; William C. Vantrease ^[1] ; David A. Bender ^[1] ; Chelsea C. Crimi ^[1] ; Kathryn L. Stowers ^[1] ; Matthew D. Ruiz ^[1] ; Trisha A. VanDusseldorp ^[2] ; Yuri Feito ^[2] ; Gerald T. Mangine ^[2]
  1. [1] Lipscomb University

     Lipscomb University

     Estados Unidos

     
  2. [2] Exercise Science and Sport Management, Kennesaw State University, Kennesaw, Georgia
• Localización: Journal of strength and conditioning research: the research journal of the NSCA, ISSN 1064-8011, Vol. 34, Nº. 11, 2020, págs. 3173-3181
• Idioma: inglés
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• Resumen

  • We examined the effects of probiotic (Bacillus subtilis) supplementation during offseason training in collegiate athletes. Twenty-three Division I female athletes (19.6 +/- 1.0 years, 67.5 +/- 7.4 kg, and 170.6 +/- 6.8 cm) participated in this study and were randomized into either a probiotic (n = 11; DE111) or placebo (n = 12; PL) group while counterbalancing groups for sport. Athletes completed a 10-week resistance training program during the offseason, which consisted of 3-4 workouts per week of upper- and lower-body exercises and sport-specific training. Athletes consumed DE111 (DE111; 5 billion CFU/day) or PL supplement daily for the entire 10-week program. Before and after training, all athletes underwent 1 repetition maximum (1RM) strength testing (squat, deadlift, and bench press), performance testing (vertical jump and pro-agility), and isometric midthigh pull testing. Body composition (body fat [BF]%) was completed using BODPOD and bioelectrical impedance analysis, as well as muscle thickness (MT) measurement of the rectus femoris (RF) and vastus lateralis using ultrasonography. Separate repeated-measures analyses of variance were used to analyze all data. Significant (p <= 0.05) main effects for time were observed for improved squat 1RM, deadlift 1RM, bench press 1RM, vertical jump, RF MT, and BF%. Of these, a significant group x time interaction was noted for BF% (p = 0.015), where greater reductions were observed in DE111 (-2.05 +/- 1.38%) compared with PL (-0.2 +/- 1.6%). No other group differences were observed. These data suggest that probiotic consumption in conjunction with post-workout nutrition had no effect on physical performance but may improve body composition in female Division I soccer and volleyball players after offseason training.