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Acute Effects of Rhodiola Rosea and Caffeine on Mean Propulsive Velocity Loss in Resistance Training (Rhocaf2)

2026年11月4日 更新者：MARINA MEDINA CORRALES

The Acute Effects of 1,000 mg of Rhodiola Rosea and 3 mg/kg of Caffeine on Mean Propulsive Velocity Loss in Advanced Resistance-Trained Subjects: A Randomized, Double-Blind, Placebo-Controlled Crossover Trial

The goal of this clinical trial is to evaluate if combined acute supplementation with Rhodiola rosea and caffeine is superior to single-ingredient intake or placebo in attenuating neuromuscular fatigue in advanced resistance-trained subjects.

The main questions it aims to answer are:

Does combined supplementation attenuate mean propulsive velocity loss during heavy resistance exercise? Does combined supplementation reduce ratings of perceived exertion and increase repetitions performed to failure?

Researchers will compare four experimental conditions (placebo, caffeine alone, Rhodiola rosea alone, and combined supplementation) in a randomized crossover design to see if co-ingestion provides superior anti-fatigue benefits.

Participants will:

Complete a familiarization session to establish individual strength baselines. Attend 4 testing visits separated by a 72-hour washout period. Ingest the assigned treatment before testing. Perform a back squat fatigue protocol (3 sets at 70% 1RM) and complete perceptual evaluations.The goal of this clinical trial is to evaluate if combined acute supplementation with Rhodiola rosea and caffeine is superior to single-ingredient intake or placebo in attenuating neuromuscular fatigue in advanced resistance-trained subjects.

The main questions it aims to answer are:

Does combined supplementation attenuate mean propulsive velocity loss during heavy resistance exercise? Does combined supplementation reduce ratings of perceived exertion and increase repetitions performed to failure?

Researchers will compare four experimental conditions (placebo, caffeine alone, Rhodiola rosea alone, and combined supplementation) in a randomized crossover design to see if co-ingestion provides superior anti-fatigue benefits.

Participants will:

Complete a familiarization session to establish individual strength baselines. Attend 4 testing visits separated by a 72-hour washout period. Ingest the assigned treatment before testing. Perform a back squat fatigue protocol (3 sets at 70% 1RM) and complete perceptual evaluations.

調査の概要

状態

まだ募集していません

条件

介入・治療

詳細な説明

This study is a randomized, double-blind, placebo-controlled, four-arm crossover trial designed to investigate the acute neuromuscular and ergogenic effects of single and combined supplementation with Rhodiola rosea (1,000 mg) and caffeine (3 mg/kg) in advanced resistance-trained subjects.

Neuromuscular fatigue during heavy resistance training impairs movement velocity, power output, and overall volume performance. While caffeine is a central nervous system stimulant that enhances motor unit recruitment and reduces perceived exertion, Rhodiola rosea is an adaptogen proposed to modulate central monoamines and attenuate fatigue during high-intensity effort. This protocol evaluates whether co-ingestion provides a synergistic advantage over isolated administration or placebo in maintaining movement execution quality and accelerating acute recovery.

Study Procedures:

Familiarization Session: Prior to the experimental trials, participants complete a familiarization session to establish baseline measurements and estimate 1-repetition maximum (1RM) in the barbell back squat using a two-point load-velocity method (using loads corresponding to ~1.0 m/s and ~0.5 m/s) with a linear position transducer.

Experimental Trials (4 Visits): Participants complete four experimental testing visits in a randomized, counterbalanced order, separated by a 72-hour washout period.

During each of the 4 experimental visits, participants complete the following sequence:

Supplement Ingestion: Double-blind administration of the assigned treatment:

Rhodiola placebo consists of opaque cornstarch capsules. Caffeine placebo consists of a 60 mL liquid solution containing sweetener, 3 g of sugar, and 1 g of citric acid.

Active conditions consist of 1,000 mg of Rhodiola rosea and/or 3 mg/kg of caffeine.

Pre-Exercise Evaluation: Completion of baseline perceptual questionnaires. Velocity Determination: Identification of the exact load corresponding to a Mean Propulsive Velocity (MPV) of 1.0 ± 0.03 m/s in the back squat.

Acute Fatigue Protocol: Execution of 3 sets at 70% estimated 1RM in the back squat performed to muscular failure, recording total repetitions and velocity loss across sets.

Post-Fatigue Velocity Recovery: Re-assessment of MPV using the pre-determined 1.0 m/s load at exactly 1 minute and 2 minutes post-fatigue protocol to evaluate acute neuromuscular fatigue and velocity recovery.

Perceptual Evaluation: Rating of Perceived Exertion (RPE) recorded post-exercise.

研究の種類

介入

入学 (推定)

20

段階

  • 適用できない

連絡先と場所

このセクションには、調査を実施する担当者の連絡先の詳細と、この調査が実施されている場所に関する情報が記載されています。

研究連絡先

研究連絡先のバックアップ

研究場所

  • メキシコ
    • Nuevo León
      • San Nicolás、Nuevo León、メキシコ、66455
        • Faculty of Sports Organization, Universidad Autonoma de Nuevo Leon
        • コンタクト：

参加基準

研究者は、適格基準と呼ばれる特定の説明に適合する人を探します。これらの基準のいくつかの例は、人の一般的な健康状態または以前の治療です。

適格基準

就学可能な年齢

18年～35年 (大人)

健康ボランティアの受け入れ

はい

受講資格のある性別

全て

説明

Inclusion Criteria:

  • Healthy males and females.
  • Advanced resistance training experience (as defined by Santos et al., 2021): 1 to 3 years of consistent resistance training experience, demonstrating proper barbell back squat technique.
  • Relative maximum strength (estimated 1RM back squat): Minimum of 150% of body mass for men, and 130% of body mass for women.
  • Habitual caffeine consumers (e.g., daily intake via coffee, tea, sports gels, or energy drinks).
  • Commitment to maintaining current nutritional habits and training routines throughout the study period.
  • Ensured stable consumption of dietary supplements with cumulative effects (e.g., creatine, beta-alanine, nitrates, citrulline, betaine) for at least one month prior to and throughout the experimental protocol, with a commitment to not alter the dosage. Intake will be recorded and standardized.
  • Availability to attend all scheduled evaluations.
  • Provision of written informed consent validating full understanding of the study protocols.

Exclusion Criteria:

  • Presence of cardiovascular diseases (e.g., arterial hypertension, arrhythmias) or metabolic disorders (e.g., type 1 or type 2 diabetes mellitus).
  • At least one affirmative response on the Physical Activity Readiness Questionnaire for Everyone (PAR-Q+).
  • History of anabolic steroid use (less than 4 years) or use of World Anti-Doping Agency (WADA) prohibited performance-enhancing substances.
  • Consumption of supplements with acute ergogenic effects (e.g., coffee, energy drinks, pre-workout supplements) within 12 hours prior to testing sessions, or failure to comply with a minimum 4-hour fasting period prior to the experimental session. (Note: Subjects violating these criteria will have their session rescheduled).

研究計画

このセクションでは、研究がどのように設計され、研究が何を測定しているかなど、研究計画の詳細を提供します。

研究はどのように設計されていますか？

デザインの詳細

  • 主な目的：基礎科学
  • 割り当て：ランダム化
  • 介入モデル：クロスオーバー割り当て
  • マスキング：ダブル

武器と介入

参加者グループ / アーム
介入・治療
プラセボコンパレーター：Placebo

Placebo condition consisting of opaque cornstarch capsules and a 60 mL placebo liquid solution.
他の：Rhodiola Placebo

Opaque cornstarch capsules matching the active Rhodiola capsules.

他の：Caffeine Placebo

60 mL liquid solution containing sweetener, 3 g of sugar, and 1 g of citric acid.
実験的：Caffeine

Single administration of caffeine alongside placebo capsules.
他の：Rhodiola Placebo

Opaque cornstarch capsules matching the active Rhodiola capsules.

ダイエットサプリメント：Caffeine

3 mg/kg of caffeine administered in a 60 mL liquid solution.
実験的：Rhodiola rosea

Single administration of Rhodiola rosea alongside placebo liquid solution.
他の：Caffeine Placebo

60 mL liquid solution containing sweetener, 3 g of sugar, and 1 g of citric acid.

ダイエットサプリメント：Rhodiola Rosea Capsules

1,000 mg of Rhodiola rosea administered in opaque capsules.
実験的：Rhodiola rosea + Caffeine

Combined administration of Rhodiola rosea and caffeine.
ダイエットサプリメント：Caffeine

3 mg/kg of caffeine administered in a 60 mL liquid solution.

ダイエットサプリメント：Rhodiola Rosea Capsules

1,000 mg of Rhodiola rosea administered in opaque capsules.

この研究は何を測定していますか？

主要な結果の測定

結果測定
メジャーの説明
時間枠
Percentage Loss in Mean Propulsive Velocity (MPV)
時間枠：Baseline (pre-fatigue), 1 minute, and 2 minutes post-fatiguing exercise protocol, up to 2 weeks.

Percentage loss in mean propulsive velocity (MPV) following the fatiguing protocol. MPV is assessed during the barbell back squat using an individualized load corresponding to an initial velocity of 1.0 ± 0.03 m/s, recorded via a linear position transducer. Percentage loss is calculated relative to pre-fatigue baseline as: [(baseline MPV - post-fatigue MPV) / baseline MPV] × 100. The fatiguing protocol consists of 3 sets to failure at 70% 1RM.
Baseline (pre-fatigue), 1 minute, and 2 minutes post-fatiguing exercise protocol, up to 2 weeks.

二次結果の測定

結果測定
メジャーの説明
時間枠
Total Number of Repetitions to Failure
時間枠：Immediately upon completion of the fatiguing exercise protocol, up to 2 weeks

Cumulative number of successful repetitions completed across 3 sets at 70% 1RM performed to momentary muscular failure during the fatiguing protocol. Data are reported as the total number of repetitions completed per experimental condition.
Immediately upon completion of the fatiguing exercise protocol, up to 2 weeks
Rating of Perceived Exertion (RPE)
時間枠：Immediately, 1 minute, and 2 minutes post-fatiguing exercise protocol, up to 2 weeks

Subjective perception of effort assessed using a standardized RPE scale immediately following the fatiguing protocol to quantify internal load.
Immediately, 1 minute, and 2 minutes post-fatiguing exercise protocol, up to 2 weeks

協力者と研究者

ここでは、この調査に関係する人々や組織を見つけることができます。

スポンサー

MARINA MEDINA CORRALES

捜査官

  • スタディチェア：José Raúl Hoyos Flores, PhD、Faculty of Sports Organization, Universidad Autonoma de Nuevo Leon
  • スタディディレクター：Marina Medina Corrales, PhD、Faculty of Sports Organization, Universidad Autonoma de Nuevo Leon
  • スタディチェア：Myriam Zaraí García Dávila, PhD、Faculty of Sports Organization, Universidad Autonoma de Nuevo Leon

研究記録日

これらの日付は、ClinicalTrials.gov への研究記録と要約結果の提出の進捗状況を追跡します。研究記録と報告された結果は、国立医学図書館 (NLM) によって審査され、公開 Web サイトに掲載される前に、特定の品質管理基準を満たしていることが確認されます。

主要日程の研究

研究開始 (推定)

2026年10月12日

一次修了 (推定)

2026年11月6日

研究の完了 (推定)

2026年12月1日

試験登録日

最初に提出

2026年9月26日

QC基準を満たした最初の提出物

2026年11月4日

最初の投稿 (実際)

2026年11月9日

学習記録の更新

投稿された最後の更新 (実際)

2026年11月9日

QC基準を満たした最後の更新が送信されました

2026年11月4日

最終確認日

2026年11月1日

詳しくは

本研究に関する用語

キーワード

追加の関連 MeSH 用語

その他の研究ID番号

  • CEIFOD 0125028

個々の参加者データ (IPD) の計画

個々の参加者データ (IPD) を共有する予定はありますか?

はい

IPD 共有時間枠

Data will become available after publication of the main manuscript in a peer-reviewed journal and will remain accessible indefinitely.

IPD 共有アクセス基準

Data and supporting materials will be publicly accessible via the Open Science Framework (OSF) repository to any researcher interested in secondary or meta-analysis.

IPD 共有サポート情報タイプ

  • ICF
  • ANALYTIC_CODE

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