Willems Mark E T, Spurr Tilly J, Lacey Jonathan, Briggs Andrew R
Institute of Applied Sciences, University of Chichester, College Lane, Chichester PO19 6PE, UK.
St Richard's Hospital, Spitalfield Lane, Chichester PO19 6SE, UK.
J Funct Morphol Kinesiol. 2024 Aug 21;9(3):141. doi: 10.3390/jfmk9030141.
New Zealand blackcurrant (NZBC) is known to alter exercise-induced physiological and metabolic responses with chronic (i.e., 7 days) dosing. We examined the effects of acute intake of New Zealand blackcurrant (NZBC) extract on 4 h indoor cycling-induced physiological and metabolic responses in a male amateur Ironman athlete (age: 49 years; BMI: 24.3 kg·m; V˙O: 58.6 mL·kg·min; maximal aerobic power: 400 W; history: 14 Ironman events in 16 years) three weeks before competition. Indirect calorimetry was used and heart rate was recorded at 30 min intervals during 4 h indoor (~22.4 °C, relative humidity: ~55%) constant power (165 W) cycling on a Trek Bontrager connected to a Kickr smart trainer. Blood lactate and rating of perceived exertion (RPE) were taken at 60 min intervals. Study was a single-blind placebo-controlled study with capsules (4 × 105 mg anthocyanins) taken 2 h before starting the 4 h of cycling. Water was allowed ad libitum with personalised consumption of gels [a total of eight with three with caffeine (100 mg)], two bananas and 8 × electrolyte capsules (each 250 mg sodium and 125 mg potassium) at personalised time-points. With NZBC extract (CurraNZ), during 4 h of cycling (mean of 8 measurements), minute ventilation was 8% lower than placebo. In addition, there was no difference for oxygen uptake, with carbon dioxide production found to be 4% lower with NZBC extract. With the NZBC extract, the ventilatory equivalents were lower for oxygen and carbon dioxide by 5.5% and 3.7%; heart rate was lower by 10 beats·min; lactate was 40% different with lower lactate at 2, 3 and 4 h; RPE was lower at 2, 3 and 4 h; and carbohydrate oxidation was 11% lower. With NZBC extract, there was a trend for fat oxidation to be higher by 13% ( = 0.096), with the respiratory exchange ratio being lower by 0.02 units. Acute intake of New Zealand blackcurrant extract (420 mg anthocyanins) provided beneficial physiological and metabolic responses during 4 h of indoor constant power cycling in a male amateur Ironman athlete 3 weeks before a competition. Future work is required to address whether acute and chronic dosing strategies with New Zealand blackcurrant provide a nutritional ergogenic effect for Ironman athletes to enhance swimming, cycling and running performance.
已知新西兰黑加仑（NZBC）通过长期（即7天）给药可改变运动诱导的生理和代谢反应。我们在比赛前三周，研究了一名男性业余铁人三项运动员（年龄：49岁；体重指数：24.3 kg·m；摄氧量：58.6 mL·kg·min；最大有氧功率：400 W；运动经历：16年中参加过14次铁人三项赛事）急性摄入新西兰黑加仑（NZBC）提取物对4小时室内骑行诱导的生理和代谢反应的影响。采用间接测热法，并在连接到Kickr智能训练器的Trek Bontrager上进行4小时室内（约22.4°C，相对湿度：约55%）恒定功率（165 W）骑行期间，每隔30分钟记录心率。每隔60分钟采集血乳酸和主观用力程度分级（RPE）。该研究为单盲安慰剂对照研究，在开始4小时骑行前2小时服用胶囊（4×105毫克花青素）。可随意饮水，并在个性化时间点食用个性化的凝胶（共8个，其中3个含咖啡因100毫克）、两根香蕉和8粒电解质胶囊（每粒含250毫克钠和125毫克钾）。服用NZBC提取物（CurraNZ）后，在4小时骑行期间（8次测量的平均值），分钟通气量比安慰剂组低8%。此外，摄氧量无差异，发现NZBC提取物组的二氧化碳产生量低4%。服用NZBC提取物后，氧和二氧化碳的通气当量分别降低5.5%和3.7%；心率降低10次·分钟；血乳酸在2、3和4小时时差异为40%，且血乳酸含量较低；2、3和4小时时的RPE较低；碳水化合物氧化率低11%。服用NZBC提取物后，脂肪氧化有升高13%的趋势（P = 0.096），呼吸交换率降低0.02个单位。在比赛前三周，男性业余铁人三项运动员急性摄入新西兰黑加仑提取物（420毫克花青素）在4小时室内恒定功率骑行期间产生了有益的生理和代谢反应。未来需要开展工作，以确定新西兰黑加仑的急性和长期给药策略是否能为铁人三项运动员提供营养增强效应，从而提高游泳、骑行和跑步成绩。
