Effects of Hydrolyzed Collagen and Vitamin C on Collagen Synthesis and Explosive Performance
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 23
- 试验地点
- 2
- 主要终点
- Rate of force development (RFD)
研究概览
简要总结
Previous work has shown that gelatin supplementation could increase collagen synthesis in humans. In this study subjects consume placebo, 5 or 15 g of gelatin with a standard amount of vitamin C (48 mg) 1 hour before 6 minutes of jump rope exercise. The feeding and exercise intervention was repeated every 6 hours while the subjects were awake for three days and the amount of the amino terminal procollagen I peptide (PINP) was determined; a marker of collagen synthesis, in the blood. Consistent with the hypothesis that gelatin increases collagen synthesis in humans; the amount of PINP in the 15 g gelatin group was significantly higher than either the placebo or the 5 g groups. These data conclusively demonstrate that gelatin supplementation can increase exercise-induced collagen synthesis in humans. Hydrolyzed collagen has a similar amino acid profile, in particular with high concentrations of glycine, proline, hydroxyproline, and arginine. Thus the current study aims to precisely map out the dose response relationship of hydrolyzed collagen and vitamin C on PINP and to determine the optimal dose to achieve maximal increased in PINP levels.
详细描述
In preliminary work investigating the physiological determinants of maximal performance in throwing events, researchers found that the best predictor of elite performance was the rate of force development (RFD; Force (N) x time (sec)) when performing and isometric squat. Therefore, it is not surprising that in order to maximize performance, athletes train to optimize RFD.
RFD is determined by three factors:
- Neural activation of the muscles
- Type of motor protein (fast or slow myosin)
- Force transfer Interestingly, performance in power movements (that are highly dependent on RFD) like vertical jump is closely related to tendon stiffness and inversely related to muscle size. This indicates that force transfer, in the form of tendon stiffness, plays an important role in performance and can explain a large amount of variance in determining an athlete's ability to rapidly develop force during a dynamic movement.
The stiffness of a tendon is determined by the amount and cross-linking of collagen within the tissue. Acute exercise is known to increase collagen synthesis as well as the expression of the primary enzyme involved in collagen cross-linking, lysyl oxidase. The result is a denser and stiffer tissue after training. Even though the relationship between exercise and collagen synthesis is known, whether this measure of performance can be improved with nutritional interventions has not been determined.
A recent study looking at amino acid levels following consumption of increasing doses of gelatin (derivative of collagen) in human subjects has shown that the key primary and trace amino acids found in collagen increase in human serum after consuming gelatin. Further, the peak of these amino acids occurs 60 minutes after consuming the gelatin supplement. Therefore, consuming a collagen supplement 1 hour before an exercise intervention should maximize delivery of amino acids to bone and other connective tissues.
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
- Double (Participant, Investigator)
盲法说明
All nutritional interventions taste and look similar and are prepared for subjects in opaque bottles
入排标准
- 年龄范围
- 18 Years 至 25 Years（Adult）
- 性别
- Male
- 接受健康志愿者
- 是
入选标准
- •Collegiate level male athletes between 18 - 25 years of age
- •Currently registered/participating as an intercollegiate athlete
- •< 3 musculoskeletal injuries in the past year
- •No health or dietary restriction that would be affected by the supplementation protocol.
排除标准
- •History of more than 3 musculoskeletal injuries within the past 12 months.
- •Health, dietary restriction or diet that would be affected by the supplementation protocol.
- •Then initial phases of this study will be performed in males since collagen synthesis varies significantly throughout the menstrual cycle in females. Since collagen in the main outcome measure for this study this natural variation would confound the initial phase of the work. Provided this work proves successful then we will aim to perform similar studies in females.
研究组 & 干预措施
Hydrolyzed collagen
First, we aim to determine the optimal amount of hydrolyzed collagen with a constant dose of vitamin C in humans to increase a marker of collagen synthesis (PINP). In a randomized, double-blinded, crossover design subjects consume a nutritional supplement with varying doses of hydrolyzed collagen (control (0 g), 5 10, 20 and 30 g hydrolyzed collagen) with a constant dose of vitamin C (50 mg). Each intervention will be separated by a 6-day wash out. Subjects will be asked to consume the supplement 1 hour before 6-min of jump rope exercise. Following completion of exercise, subjects will remain in the lab in a rested state for the subsequent 4 hours. After 4 hours and 24 hours blood samples will be collected. Blood samples will be used for PINP analysis.
干预措施: Hydrolyzed collagen (Dietary Supplement)
Optimized Collagen and Vitamin C supplement
The findings from the first 2 arms of the study will be used to inform a training-based study aimed to determine whether exercise together with this optimal dose of hydrolyzed collagen and vitamin C is sufficient to improve rate of force development (RFD) and performance. A gummy food will be developed with the optimized dose of hydrolyzed collagen and vitamin C as well as a placebo. In a randomized, double-blinded, parallel design with subjects undertake a 3 week exercise protocol. The supplement will be ingested 1 hour prior to each exercise session (Monday/Wednesday/Friday). Exercise testing to assess rate of force development (RFD) will take place at the end of each week (Fridays) and these outcomes will be the basis for determining the effects of the nutrition intervention on performance.
干预措施: Optimized Hydrolyzed Collagen and Vitamin C (Dietary Supplement)
Gummy Placebo
A gummy food will be developed with the optimized dose of hydrolyzed collagen and vitamin C as well as a placebo. In a randomized, double-blinded, parallel design with subjects undertake a 3 week exercise protocol. The supplement or placebo will be ingested 1 hour prior to each exercise session (Monday/Wednesday/Friday). Exercise testing to assess rate of force development (RFD) will take place at the end of each week (Fridays) and these outcomes will be the basis for determining the effects of the nutrition intervention on performance.
干预措施: Gummy Placebo (Dietary Supplement)
Vitamin C
Second, we aim to determine the optimal amount of vitamin C with the determined optimal dose of hydrolyzed collagen in humans to increase a marker of collagen synthesis (PINP). In a randomized, double-blinded, crossover design subjects consume a nutritional supplement with varying doses of vitamin C (0 (control), 50, 250 and 500 mg) with an optimized dose of hydrolyzed collagen as determined from the first arm. Each intervention will be separated by a 6-day wash out. Subjects will be asked to consume the supplement 1 hour before 6-min of jump rope exercise. Following completion of exercise, subjects will remain in the lab in a rested state for the subsequent 4 hours. After 4 hours and 24 hours blood samples will be collected. Blood samples will be used for PINP analysis.
干预措施: Vitamin C (Dietary Supplement)
结局指标
主要结局
Rate of force development (RFD)
时间窗: 3 weeks
a measure of explosive strength
PINP Levels
时间窗: 9 weeks
To determine optimal dose of supplemental hydrolyzed collagen and vitamin C required to maximally elevate PINP levels (a marker of collagen synthesis) in healthy athletes.
次要结局
未报告次要终点