Da Ponte Alessandro, Giovanelli Nicola, Nigris Daniele, Lazzer Stefano
Department of Medical and Biological Sciences, University of Udine, Udine, Italy -
School of Sports Medicine, University of Udine, Udine, Italy -
J Sports Med Phys Fitness. 2018 May;58(5):612-621. doi: 10.23736/S0022-4707.17.06883-9. Epub 2017 Apr 26.
Recent studies showed a positive effect of hydrogen rich water (HRW) intake on acid-base homeostasis at rest. We investigated 2-weeks of HRW intake on repeated sprint performance and acid-base status during prolonged intermittent cycling exercise.
In a cross over single-blind protocol, 8 trained male cyclists (age [mean±SD] 41±7 years, body mass 72.3±4.4 kg, height 1.77±0.04 m, maximal oxygen uptake [V̇O2max] 52.6±4.4 mL·kg-1·min-1) were provided daily with 2 liters of placebo normal water (PLA, pH 7.6, oxidation/reduction potential [ORP] +230 mV, free hydrogen content 0 ppb) or HRW (pH 9.8, ORP -180 mV, free Hydrogen 450 ppb). Tests were performed at baseline and after each period of 2 weeks of treatment. The treatments were counter-balanced and the sequence randomized. The 30-minute intermittent cycling trial consisted in 10 3-minute blocks, each one composed by 90 seconds at 40% V̇O2max, 60 seconds at 60% V̇O2max, 16 seconds all out sprint, and 14 seconds active recovery. Oxygen uptake (V̇O2), heart rate and power output were measured during the whole test, while mean and peak power output (PPO), time to peak power and Fatigue Index (FI) were determined during all the 16 seconds sprints. Lactate, pH and bicarbonate (HCO3-) concentrations were determined at rest and after each sprint on blood obtained by an antecubital vein indwelling catheter.
In the PLA group, PPO in absolute values decreased significantly at the 8th and 9th of 10 sprints and in relative values, ΔPPO, decreased significantly at 6th, 8th and 9th of 10 sprints (by mean: -12±5%, P<0.006), while it remained unchanged in HRW group. Mean power, FI, time to peak power and total work showed no differences between groups. In both conditions lactate levels increased while pH and HCO3- decreased progressively as a function of the number of sprints.
Two weeks of HRW intake may help to maintain PPO in repetitive sprints to exhaustion over 30 minutes.
近期研究表明，摄入富氢水（HRW）对静息状态下的酸碱平衡具有积极作用。我们研究了连续两周摄入HRW对长时间间歇骑行运动中重复冲刺能力和酸碱状态的影响。
采用交叉单盲方案，8名训练有素的男性自行车运动员（年龄[均值±标准差]41±7岁，体重72.3±4.4 kg，身高1.77±0.04 m，最大摄氧量[V̇O2max]52.6±4.4 mL·kg-1·min-1）每天分别饮用2升安慰剂普通水（PLA，pH 7.6，氧化还原电位[ORP]+230 mV，游离氢含量0 ppb）或HRW（pH 9.8，ORP -180 mV，游离氢450 ppb）。在基线期以及每个为期2周的治疗期结束后进行测试。治疗进行了平衡处理，顺序随机安排。30分钟的间歇骑行试验包括10个3分钟的时段，每个时段由40%V̇O2max强度下的90秒、60%V̇O2max强度下的60秒、全力冲刺16秒以及主动恢复14秒组成。在整个测试过程中测量摄氧量（V̇O2）、心率和功率输出，同时在所有16秒的冲刺过程中测定平均功率和峰值功率输出（PPO）、达到峰值功率的时间以及疲劳指数（FI）。通过肘前静脉留置导管采集血液，测定静息状态以及每次冲刺后血液中的乳酸、pH值和碳酸氢盐（HCO3-）浓度。
在PLA组中，10次冲刺中的第8次和第9次冲刺时PPO绝对值显著下降，相对值ΔPPO在10次冲刺中的第6次、第8次和第9次显著下降（平均下降：-12±5%，P<0.006），而HRW组中PPO保持不变。平均功率、FI、达到峰值功率的时间和总功在两组之间没有差异。在两种情况下，乳酸水平均升高，而pH值和HCO3-随着冲刺次数的增加而逐渐降低。
连续两周摄入HRW可能有助于在30分钟的重复冲刺至疲劳过程中维持PPO。
