Pre-exercise Ingestion of a Low Glycaemic Index Rice-based Mixed Meal Increases Fat Oxidation and Endurance Running in a Hot-humid Environment
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 12
- 试验地点
- 1
- 主要终点
- Time to complete 10 km time-trial
研究概览
简要总结
The objective of this research is to determine the influence of low and high glycemic index Malaysian pre-exercise mixed meals on endurance exercise performance in a hot-humid environment. Glycemic index (GI) is a method used to classify CHO-containing foods based on their influence on postprandial blood glucose when compared to the response on blood glucose after ingesting the same amount of CHO from a reference food (glucose or bread). Low GI (LGI) foods are digested and absorbed more slowly as compared to high GI (HGI) foods, resulting in a stable rise in blood glucose levels.
The participants were trained male endurance long-distance runners. On the day of experimental trials, they consumed pre-exercise rice-based mixed meal, either LGI or HGI 3 hours before endurance running exercise. After that, they ran for 45 minutes at constant running speed equivalent to 70% VO2peak, followed by 10km time-trial. The respiratory gases, blood measures, rectal and skin temperature were measured throughout the running test.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Crossover
- 主要目的
- Treatment
- 盲法
- Single (Participant)
入排标准
- 年龄范围
- 18 Years 至 35 Years（Adult）
- 性别
- Male
- 接受健康志愿者
- 是
入选标准
- •age 18-35 years old
- •trained (peak oxygen consumption (V̇O2peak): ≥ 55 mL.kg-1.min-1)
- •training volume (>150 min, ≥ three times per week)
- •competing at the national level
- •>2-year of running experience
- •tier 2 (trained) or tier 3 (highly trained) runners (McKay et al. 2022)
- •no allergies to any test foods
排除标准
- •diagnosis of chronic diseases (i.e. diabetes mellitus, hypertension, cardiovascular disease)
- •bone, muscle or joint impairments
- •on medication
- •currently smoking
- •use of illicit drugs
- •use of dietary supplements
- •on any particular diet
结局指标
主要结局
Time to complete 10 km time-trial
时间窗: Up to 1 hour
The participant was clearly instructed to complete the 10 km time-trial as quickly as possible. The 10 km time-trial commenced with a 30-s rolling start to the participant's 70% V̇O2peak speed, after which the participant could freely adjust the speed. Throughout the 10 km time-trial, the prevailing running velocity and time-lapse were blinded to the participant, and only information on the distance covered at 1 km intervals was verbally provided to the participant.
次要结局
- Serum cortisol(Up to 5 hours)
- Thermoregulatory measure(Up to 2 hours)
- Serum insulin(Up to 5 hours)
- Capillary blood glucose(Up to 5 hours)
- Heart rate(Up to 2 hours)
- Fat and carbohydrate oxidation(Up to 2 hours)
- Serum lactate(Up to 2 hours)
研究者
Zaini Bahari
Principle Investigator
Universiti Sains Malaysia