Exercise and Performance Nutrition Laboratory, College of Science, Technology and Health, Lindenwood University, St. Charles, MO 63301, USA.
Nutrients. 2024 Mar 1;16(5):717. doi: 10.3390/nu16050717.
This study compared flavored kefir (KFR) and flavored milk (MLK) as a recovery drink in endurance master athletes. Using a randomized, placebo-controlled, non-blinded crossover design, 11 males and females completed three testing visits whilst acutely ingesting either KFR, MLK, or water as a placebo (PLA). KFR supplementation occurred for 14 days before the KFR-testing day, followed by a 3-week washout period. Testing visits consisted of an exhausting-exercise (EE) bout, a 4-h rest period where additional carbohydrate feeding was provided, and a treadmill 5 km time trial (TT). The Gastrointestinal Symptom Rating Scale (GSRS) survey was assessed at four timepoints. Blood was collected at baseline and after the TT and was analyzed for I-FABP levels. No significant difference (PLA: 33:39.1 ± 6:29.0 min, KFR: 33:41.1 ± 5:44.4 min, and MLK: 33:36.2 ± 6:40.5 min, = 0.99) was found between the groups in TT performance. The KFR GSRS total score was significantly lower than the PLA after EE ( = 0.005). No differences in I-FABP were observed between conditions. In conclusion, acute KFR supplementation did not impact TT performance or I-FABP levels but may have reduced subjective GI symptoms surrounding exercise when compared to MLK or PLA.
这项研究比较了风味开菲尔（KFR）和风味牛奶（MLK）作为耐力大师运动员的恢复饮料。使用随机、安慰剂对照、非盲交叉设计，11 名男性和女性在急性摄入 KFR、MLK 或水作为安慰剂（PLA）时完成了三次测试访问。KFR 补充剂在 KFR 测试日之前进行了 14 天，然后进行了 3 周的洗脱期。测试访问包括一次耗竭性运动（EE）回合、4 小时休息期，在此期间提供额外的碳水化合物喂养，以及跑步机 5 公里计时赛（TT）。在四个时间点评估胃肠道症状评分量表（GSRS）调查。在基线和 TT 后采集血液，并分析 I-FABP 水平。在 TT 表现方面，各组之间没有发现显著差异（PLA：33:39.1 ± 6:29.0 min，KFR：33:41.1 ± 5:44.4 min，和 MLK：33:36.2 ± 6:40.5 min， = 0.99）。在 EE 后，KFR GSRS 总分明显低于 PLA（ = 0.005）。在条件之间未观察到 I-FABP 的差异。总之，急性 KFR 补充剂不会影响 TT 表现或 I-FABP 水平，但与 MLK 或 PLA 相比，可能会减少运动时的主观胃肠道症状。
