Effects of Combined Caffeine and Rhodiola Rosea Supplementation on Aerial Duel Performance Under Fatigue in Soccer Players
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 发起方
- 入组人数
- 96
- 试验地点
- 2
- 主要终点
- Early takeoff impulse (Impulse₀-₂₀₀)
研究概览
简要总结
This study will examine whether caffeine (CAF) and Rhodiola rosea (RHO) supplementation, taken alone or in combination, can improve explosive performance and soccer-specific aerial duel performance in trained male soccer players. In a randomized, double-blind, placebo-controlled, parallel design, participants will be assigned to placebo, RHO, CAF, or RHO+CAF for 4 weeks. Performance outcomes will be assessed before and after the intervention using countermovement jump measures (including early take-off impulse) and standardized heading tests (heading reach height, ball exit velocity, and heading duel success rate), with additional measures of neck isometric strength and perceived exertion.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Parallel
- 主要目的
- Other
- 盲法
- Triple (Participant, Investigator, Outcomes Assessor)
盲法说明
Participants, outcome assessors, and data analysts are blinded to group allocation. Supplement distribution and group coding are managed by an independent researcher not involved in data collection or statistical analysis. All capsules are identical in appearance to maintain blinding throughout the study period.
入排标准
- 年龄范围
- 18 Years 至 30 Years（Adult）
- 性别
- Male
- 接受健康志愿者
- 是
入选标准
- •Healthy male soccer players from the Beijing Sport University team.
- •Systematic soccer-specific training background and stable competitive level.
- •Suitable for high-intensity physical testing based on the Physical Activity Readiness Questionnaire (PAR-Q).
排除标准
- •History of neuromuscular or musculoskeletal system diseases.
- •Intake of caffeine (coffee/tea), other supplements, ergogenic aids, or alcohol within the last 3 months.
- •Current use of antidepressants or central nervous system stimulants.
研究组 & 干预措施
Placebo Control Group (CTR)
Participants receive empty capsules (containing starch or rice flour) identical to the active supplements for 30 days.
干预措施: Placebo (Dietary Supplement)
Rhodiola Rosea Group (RHO)
Daily supplementation of 2.4g Rhodiola rosea extract (approx. 12mg salidroside) for 30 days, taken in two doses before breakfast and lunch.
干预措施: Rhodiola rosea extract (Dietary Supplement)
Caffeine Group (CAF)
A single dose of 3 mg/kg body mass of anhydrous caffeine administered 30 minutes before exercise testing.
干预措施: Caffeine (Dietary Supplement)
Combined Rhodiola and Caffeine Group (RHO + CAF)
Combined daily supplementation of 2.4g Rhodiola rosea for 30 days and a single 3 mg/kg dose of caffeine before testing.
干预措施: Caffeine (Dietary Supplement)
Combined Rhodiola and Caffeine Group (RHO + CAF)
Combined daily supplementation of 2.4g Rhodiola rosea for 30 days and a single 3 mg/kg dose of caffeine before testing.
干预措施: Rhodiola rosea extract (Dietary Supplement)
结局指标
主要结局
Early takeoff impulse (Impulse₀-₂₀₀)
时间窗: Baseline (Day 0) and Post-intervention (Day 30), measured under both non-fatigued and fatigued conditions.
Calculated as the integration of vertical force over the first 200 ms of the countermovement jump (CMJ) takeoff phase, relative to body mass (N·s·kg-¹). This measures the capacity for rapid force production.
次要结局
- Heading contact height(Baseline (Pre-test) and 4 weeks (Post-test), including measurements under both non-fatigued and fatigued conditions at each time point.)
- Heading Ball Velocity(Baseline (Pre-test) and 4 weeks (Post-test), including measurements under both non-fatigued and fatigued conditions at each time point.)
- Aerial Duel Success Rate(Baseline (Pre-test) and 4 weeks (Post-test), including measurements under both non-fatigued and fatigued conditions at each time point.)
- Neck Isometric Strength(Baseline (Pre-test) and 4 weeks (Post-test).)
- Rate of Perceived Exertion (RPE)(Immediately after the fatigue-induction protocol and post-fatigue testing at Baseline and 4 weeks.)
研究者
Yue Dou
Graduate Student
Beijing Sport University