The Impact of a Caffeinated Sports Drink on Performance
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 26
- 试验地点
- 2
- 主要终点
- 5 kilometer cycling time trial
研究概览
简要总结
Caffeine is known to enhance physical and mental performance, but few beverages combine caffeine with electrolytes and carbohydrates to enhance exercise performance. This study evaluates a caffeinated electrolyte-glucose drink's effect on endurance, strength, and cognition. Using a repeated-measures, cross-over design, 20 trained cyclists will complete one familiarization and four randomized 3-hour experimental trials (Liquid I.V.™ Energy Multiplier, Hydration Multiplier, Sugar-Free Hydration Multiplier, and water). Each trial includes 2 hours of cycling in a warm environment (32ºC), followed by strength and cognitive assessments. Cycling performance, capillary blood, urine, and expiratory gases will be collected.
详细描述
Each subject will complete 5 trials (1 familiarization and 4 experimental) consisting of approximately 2 hours cycling in a warm environment (90ºF), followed by strength assessment and cognitive assessment via questionnaire. Each trial will be identical, with the only difference being the type of drink consumed during each trial. The first trial will be for familiarization without any blood sampling. The rest of the trials will be completed in a randomized order and the drink consumed
Cycling Endurance Exercise Performance
The exercise test will consist of a series of three consecutive cycling sets in a warm environment (90ºF), with each series consisting of:
- a 30-min submaximal ride (50% maximal power as determined from the initial)
- a 5-km time trial race-like performance effort. During each 30 min submaximal rides participants will drink a total 500 mL of fluid spread out during the 30 min. During the 5 km performance test the participants will drink 25 mL of fluid at the end of each kilometer.
At regular intervals throughout the exercise task, body weight, blood samples, respiratory gasses, and perceptual data will be collected. See study schematic provided below for specific measurement timepoints.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Crossover
- 主要目的
- Basic Science
- 盲法
- Single (Participant)
盲法说明
The type of drink ingested by the subjects will be labeled with a letter in a generic water bottle. During the trial with water a non-caloric, non-sodium-containing sweetener will be used.
入排标准
- 年龄范围
- 18 Years 至 55 Years（Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •Age 18-55
- •Healthy and injury-free (muscle, skeletal) for greater than 2 months
- •Active cyclists who train at least 3 times per week
- •Body mass index (BMI) range of 18.5-30 kg/m2
排除标准
- •• History of caffeine sensitivity
- •Cancer Diagnosis during the last 5 years
- •Pregnancy
- •History of renal disease, hypertension
- •History of a heat stroke
- •Use of testosterone therapy
- •Adults who are unable to consent (impaired decision-making capacity)
研究组 & 干预措施
Water
Water masked with non-caloric and no-sodium
干预措施: Water (Placebo) (Dietary Supplement)
Carbohydrate electrolyte solution
2% carbohydrate solution with 1,020 mg/L of Sodium
干预措施: carbohydrate electrolyte drink (Dietary Supplement)
no-sugar electrolyte solution
1% carbohydrate solution with 1,060 mg/L of Sodium
干预措施: no-sugar electrolyte drink (Dietary Supplement)
Caffeinated carbohydrate electrolyte solution
1% carbohydrate solution with 1,000 mg/L of Sodium, and 200mg/L Caffeine
干预措施: Caffeinated Carbohydrate and electrolyte drink (Dietary Supplement)
结局指标
主要结局
5 kilometer cycling time trial
时间窗: During the 3rd time trial which is the last time trial.
Time in minutes of completion the 5 kilometer cycling time trial at the 3rd exercise bout.
5 kilometer Time trial performance
时间窗: 2nd time trial
Time to completion the 2nd cycling time trial
Isokinetic stregth
时间窗: right after the cycling tests
Peak torque at 60º/sec at dominant knee during extension
Congitive performance 1
时间窗: after the completion of strength test
Attention Network Test score
Cognitive performance 2
时间窗: after the end of the strength assessment
Working Memory Test score
Congitive test 3
时间窗: right after the strength test
Stroop Task score
次要结局
- Blood glucose(at the end of the 3rd cycling time trial.)
研究者
Stavros Kavouras
Professor
Arizona State University