Carbohydrate and fluid intake affect the saliva flow rate and IgA response to cycling
Carbohydrate and fluid intake affect the saliva flow rate and IgA response to cycling
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DOI：
10.1097/00005768-200012000-00013
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发表时间：
2000-12-01
期刊：
影响因子：
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通讯作者：
Gleeson, M
中科院分区：
文献类型：
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作者：
Bishop, NC;Blannin, AK;Gleeson, M
目的：本研究的目的是研究在长时间的周期运动中，常规CHO饮料摄入和限制液体摄入对各种唾液参数的影响。方法：采用随机区组设计，15名娱乐活跃的男性以60%（V）在点O-2 max上骑自行车2小时，三次，间隔1周。在CHO和安慰剂（PLA）治疗中，受试者在运动前（400 mt）、运动中（每15分钟150 mt）和运动后（400 mt）饮用葡萄糖（60 g.L-1）或安慰剂饮料。在限制液体摄入（RFI）治疗中，受试者在运动期间每15分钟根据需要服用总计200 mt的安慰剂液体。在运动前、运动后1、1.5和2小时以及运动后1小时收集定时的非刺激性唾液样本。从8名受试者的亚组中采集运动前、运动后和运动后1 h的血液样本。结果如下：PLA和RFI处理组运动后血糖水平分别比CHO处理组低18%和20%（P < 0.01）。在运动1.5 h和2 h时，CHO治疗组的唾液流速显著高于RFI治疗组（分别为P < 0.01和P < 0.05）。CHO治疗组唾液伊加（s-IgA）浓度在整个运动过程中均显著低于RFI治疗组（P < 0.05）。治疗组之间的唾液流速或s-IgA浓度均无其他差异。s-IgA分泌率、α-淀粉酶活性和α-淀粉酶分泌率均不受给药影响。结论：这些研究结果表明，CHO和液体摄入量的影响s-IgA和唾液流速反应，以延长亚极量运动。
Purpose: The purpose of this study was to examine the effect of regular CHO beverage ingestion and restricted fluid intake on various salivary parameters during prolonged cycle exercise. Methods: In a randomized block design, 15 recreationally active men cycled for 2 h at 60% (V) over dot O-2max on three occasions, separated by 1 wk. On the CHO and placebo (PLA) treatments, subjects consumed either a glucose (60 g.L-1) or placebo drink before (400 mt), during (150 mt every 15 min), and after (400 mt) the exercise. On the restricted fluid intake (RFI) treatment subjects were given a total of 200 mt of placebo fluid to take as desired every 15-min during the exercise. Timed, unstimulated saliva samples were collected preexercise, at 1, 1.5, and 2 h of exercise and at 1 h postexercise. Blood samples were obtained from a subset of 8 subjects preexercise, postexercise, and at 1 h postexercise. Results: Postexercise plasma glucose levels were 18% and 20% lower on the PLA and RFI treatments, respectively, compared with the CHO treatment (P < 0.01). Saliva flow rates were significantly higher on the CHO treatment compared with the RFI treatment at 1.5 h and 2 h of exercise (P < 0.01 and P < 0.05, respectively). Salivary IgA (s-IgA) concentration was significantly lower on the CHO treatment compared with the RFI treatment throughout the exercise (P < 0.05). No other differences were seen between treatments for either saliva flow rate or s-IgA concentration. Neither s-IgA secretion rate, alpha -amylase activity, nor alpha -amylase secretion rate were affected by treatment. Conclusions: These findings suggest that CHO and fluid intake influence the s-IgA and saliva flow rate response to prolonged submaximal exercise.