Acute Ingestion of Beetroot Juice Does Effects on Contractile or Neuromuscular Properties in Male Trained Sprinters: a Randomized, Double-blind, Placebo-controlled Study.
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
- Tensiomyography changes (seconds): Delay time (Td) ; Contraction time (Tc) ; Sustain time (Ts) ; Relaxation time (Tr)
研究概览
简要总结
Beetroot juice is a rich source of nitrate (NO3-), which serves as a precursor to nitric oxide (NO) via the NO3- to nitrite (NO2-) to NO conversion pathway. This pathway is believed to enhance vasodilation and improve neuromuscular function, such as by increasing sarcoplasmic reticulum calcium release and re-uptake, leading to enhanced force production in type II muscle fibers and improved muscle contractile recruitment. Therefore, the aim of this study was to investigate the effects of beetroot juice supplementation on muscle contractile properties, as assessed by tensiomyography, and neuromuscular performance in sprint-trained athletes.
详细描述
Sports nutrition is a rapidly expanding scientific field that has experienced a significant increase in interest from the academic community over the past decade. Despite the extensive marketing of numerous nutritional products that claim to optimize athlete health, function, and performance, only a limited number of sports foods or dietary supplements have been supported by robust evidence for enhancing performance. Among these, caffeine, creatine, beetroot juice, β-alanine, and bicarbonate are notable for their validated efficacy, though the effectiveness of these supplements can vary based on the specific event, context of use, and the individual athlete's goals and responsiveness.
Beetroot juice, in particular, is a rich source of nitrate (NO3-), which serves as a precursor to nitric oxide (NO) through the NO3- to nitrite (NO2-) to NO conversion pathway. This pathway is believed to promote vasodilation and improve neuromuscular function, such as by increasing sarcoplasmic reticulum calcium release and re-uptake, leading to enhanced force output in type II muscle fibers and improved muscle contractile recruitment. Therefore, the aim of this study was to investigate the effects of beetroot juice supplementation on muscle contractile properties, as assessed by tensiomyography, and neuromuscular performance in sprint-trained athletes. The goal was to gain a deeper understanding of the physiological effects induced by beetroot juice intake in short-distance track and field disciplines.
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
- Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
入排标准
- 年龄范围
- 18 Years 至 40 Years（Adult）
- 性别
- Male
- 接受健康志愿者
- 是
入选标准
- •Between 18 to 40 years old.
- •With a regular training practise in track and field disciplines > 5 years.
排除标准
- •Intolerance to beetroot juice or NO3- derivatives
- •Presence of any chronic pathology or injury within three months prior to the study-
- •Use of medications or supplements (e.g., caffeine) during the study.
- •Failure to attend all experimental sessions.
- •Failure to adhere to the dietary guidelines established in the study
研究组 & 干预措施
Beetroot juice supplementation
One serving 70 mL of beetroot juice (6.4 mmol of NO3-; Beet-It-Pro Elite Shot, James White Drinks Ltd., Ipswich, UK) 2.5 h before initiating the testing session.
干预措施: Beetroot Juice (Beet-It Stamina Shot) and Exercise Training (Dietary Supplement)
Placebo supplementation
One serving 70 mL of beetroot juice placebo (0.04 mmol of NO3-; Beet-It-Pro Elite Shot, James White Drinks Ltd., Ipswich, UK) 2.5 h before initiating the testing session.
干预措施: Beetroot Juice (Beet-It Stamina Shot) and Exercise Training (Dietary Supplement)
结局指标
主要结局
Tensiomyography changes (seconds): Delay time (Td) ; Contraction time (Tc) ; Sustain time (Ts) ; Relaxation time (Tr)
时间窗: 1-week
The measurement of the rectus femoris, biceps femoris, gastrocnemius lateralis, and gastrocnemius medialis muscles was conducted using tensiomyography. We analyzed different parameters such as selay time (Td) as a time between the electrical impulse and 10% of the contraction; Contraction time (Tc) as a time between 10% and 90% of the contraction; Sustain time (Ts) as a time between 50% of the contraction and 50% of the relaxation; Relaxation time (Tr) as a time between 90% and 50% of the relaxation.
Changes in 60-m and 100-m sprint test (seconds)
时间窗: 1-week
Time to complete 60-m and 100-m sprint test using photocell timing gates
次要结局
- Changes in rate of perception effort(1-week)
- Changes in maximal countermovement and squat jump height (cm)(1-week.)
- Changes in nitrites and nitrates levels in saliva (μmol/L)(1-week)
- Changes in side effects questionnarie(1-week)