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The Effects of Acute Nitrate and Caffeine Co-ingestion on Discipline-Specific Exercise Performance.

2026年8月6日 更新者：Poznan University of Physical Education

The Acute Effects of Dietary Nitrate (Beetroot Juice), Caffeine, and Their Combination on Discipline-Specific Exercise Performance, Lactate Kinetics, and Physiological Responses in Trained Functional Fitness Athletes and Elite Junior Swimmers.

The purpose of this study is to investigate the acute, separate, and combined ergogenic effects of dietary nitrate (beetroot juice, BJ) and caffeine (CAF) supplementation on discipline-specific athletic performance. The project employs a double-blind, randomized, placebo-controlled, four-arm crossover design. It evaluates two highly distinct, heterogeneous populations of athletes: (A) adult high-intensity functional training (HIFT/CrossFit/Hyrox) competitors performing the standardized Hyrox Physical Fitness Test (P'F'T), and (B) elite junior competitive swimmers (National Team members) performing a progressive 8 × 100 m swimming test. The study will assess physical performance, lactate kinetics, subjective exertion, biochemical indices, psychological metrics, and gastrointestinal tolerance.

調査の概要

状態

状態

現在の募集状況やアクセス拡大状況を示します。
まだ募集していません

条件

条件

研究されている疾患、障害、症候群、病気、またはけが。 ClinicalTrials.gov では、条件には、寿命、生活の質、健康上のリスクなど、他の健康関連の問題も含まれる場合があります。

介入・治療

介入・治療

臨床研究の焦点となるプロセスまたはアクション。介入には、医薬品、医療機器、処置、ワクチン、および治験中またはすでに利用可能なその他の製品が含まれます。介入には、教育や食事や運動の変更などの非侵襲的アプローチも含まれます。

詳細な説明

This project addresses a critical gap in sports nutrition literature regarding the potential synergistic, additive, or antagonistic interactions of caffeine (CAF) and dietary nitrate (beetroot juice, BJ) when co-administered. While CAF acts primarily as an adenosine receptor antagonist in the central nervous system to enhance motor unit recruitment and decrease perceived exertion, BJ acts as a physiological precursor to nitric oxide, improving peripheral muscle contractility, mitochondrial efficiency, and muscle perfusion.

To evaluate whether these effects are universal or discipline-specific, the trial employs a two-population cohort design:

  • Cohort A (HIFT/Hyrox): Investigates adult functional fitness athletes (aged 18-45) characterized by concurrent strength and endurance adaptations. They will perform the ecological Hyrox P'F'T.
  • Cohort B (Elite Junior Swimmers): Investigates elite junior national team swimmers (aged 16-19) during their centralized training camp. They will undergo the standardized progressive 8 × 100 m step-test.

Furthermore, this study will analyze whether individual hematological markers (iron status) and biochemical profiles correlate with the magnitude of the ergogenic response to establish prospective predictive biomarkers for customized sports nutrition.

研究の種類

研究の種類

臨床研究の性質について説明します。研究の種類には、介入研究 (臨床試験とも呼ばれます)、観察研究 (患者登録を含む)、および拡張アクセスが含まれます。
介入

入学 (推定)

入学

臨床試験の参加者数。 「予想される」登録は、研究者が研究に必要とする参加者の目標数です。
112

段階

段階

米国食品医薬品局 (FDA) によって開発された定義に基づく、医薬品または生物学的製品を研究する臨床試験の段階。フェーズは、研究の目的、参加者の数、およびその他の特性に基づいています。初期フェーズ 1 (以前はフェーズ 0 としてリストされていた)、フェーズ 1、フェーズ 2、フェーズ 3、およびフェーズ 4 の 5 つのフェーズがあります。該当なしは、デバイスまたは行動介入の治験を含む、FDA が定義したフェーズのない治験を説明するために使用されます。
  • 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

臨床試験の登録に関する質問に回答できる担当者の名前と連絡先情報。研究が実施されている各場所には、これらの質問により適切に回答できる特定の連絡先がある場合もあります。

研究場所

  • ポーランド
    • Wielkopolska
      • Poznan、Wielkopolska、ポーランド、61-871
        • Poznań University of Physical Education
        • 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

適格基準

臨床研究への参加を希望する人々が満たさなければならない重要な要件、または彼らが持つべき特徴。適格基準は、包含基準 (人が研究に参加するために必要な基準) と除外基準 (人が研究に参加するのを妨げる基準) の両方で構成されます。適格基準のタイプには、研究が健康なボランティアを受け入れるかどうか、年齢または年齢グループの要件があるかどうか、または性別によって制限されるかどうかが含まれます。

就学可能な年齢

  • 子
  • 大人

健康ボランティアの受け入れ

はい

説明

Inclusion Criteria:

A) Cohort A (HIFT / CrossFit / Hyrox):

  • Aged 18-45 years.
  • Minimum of 2 years of systematic HIFT/CrossFit/Hyrox training experience.
  • Performing >4 training sessions per week.
  • Ability to perform the HYROX Physical Fitness Test (P'F'T) and has participated in at least one official HYROX event.
  • Possession of a valid medical certificate proving eligibility for competitive sports.

B) Cohort B (Competitive Junior Swimmers):

  • Aged 16-19 years.
  • Active member of the Polish Junior National Swimming Team.
  • Minimum of 5 years of competitive swimming experience.
  • Current training volume of at least 8-10 pool training sessions per week.
  • Written informed consent obtained from both the participant and their legal guardian (for minors under 18).

C)Common Criteria for Both Cohorts:

  • No history of cardiovascular, respiratory, metabolic, or musculoskeletal disease contradicting high-intensity exercise or stimulant intake.
  • No known food allergies or adverse reactions to beetroot products or caffeine.
  • No current use of medications that alter nitrate/caffeine metabolism (e.g., proton pump inhibitors, antibiotics, phosphodiesterase inhibitors).
  • History of uneventful habituation to caffeine use during training/competition.
  • Willingness to abstain from dietary supplements, antibacterial mouthwashes, alcohol, and high-nitrate foods for 48 hours prior to each testing session.
  • Good general health and physical well-being.

Exclusion Criteria (Applicable to both cohorts):

  • Occurrence of acute musculoskeletal injury or trauma during the study period.
  • Any medical or health contraindications (including severe menstrual disorders, planned pregnancy, or breastfeeding).
  • Failure or refusal to strictly adhere to the dietary, supplementation, and exercise testing protocols.

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：4倍

武器と介入

参加者グループ / アーム

参加者グループ / アーム

臨床試験のプロトコルに従って、特定の介入/治療を受ける、または介入を受けない、臨床試験の参加者のグループまたはサブグループ。
介入・治療

介入・治療

臨床研究の焦点となるプロセスまたはアクション。介入には、医薬品、医療機器、処置、ワクチン、および治験中またはすでに利用可能なその他の製品が含まれます。介入には、教育や食事や運動の変更などの非侵襲的アプローチも含まれます。
実験的：CAF + BJ (Active Co-ingestion)
Participants ingest a concentrated beetroot juice shot (~6.4 mmol / 400 mg nitrates) 3 hours before exercise, and a capsule of caffeine (Cohort A: 6 mg/kg body mass; Cohort B: 3 mg/kg body mass) 60 minutes before exercise.
ダイエットサプリメント：Caffeine
Anhydrous caffeine administered orally in a hard gelatine capsule. To address the unique physiological profiles of the two cohorts, a highly specific, differentiated dosing protocol is implemented: Cohort A (adult functional fitness athletes) will receive a high-performance dose of 6 mg/kg body mass, while Cohort B (elite junior swimmers) will receive a safe, youth-adapted dose of 3 mg/kg body mass. In all experimental trials, the capsule is ingested exactly 60 minutes prior to the onset of the discipline-specific exercise test to match peak plasma caffeine concentration.
ダイエットサプリメント：Dietary Nitrate (Beetroot Juice)
Concentrated beetroot juice (BJ) administered as a single, acute organic shot of 70 mL (Beet It Sport, James White Drinks Ltd., Ipswich, UK). Each active shot contains approximately 400 mg (equivalent to ~6.4 mmol) of inorganic nitrate. In contrast to chronic loading designs, this study evaluates purely acute effects; the shot is ingested exactly 3 hours (180 minutes) prior to the physical performance test to align with peak systemic concentration of plasma nitrite.
アクティブコンパレータ：CAF + PLBJ (Caffeine + Placebo BJ)
Participants ingest a nitrate-depleted beetroot juice shot (~0.04 mmol nitrates) 3 hours before exercise, and a capsule of caffeine (Cohort A: 6 mg/kg body mass; Cohort B: 3 mg/kg body mass) 60 minutes before exercise.
ダイエットサプリメント：Caffeine
Anhydrous caffeine administered orally in a hard gelatine capsule. To address the unique physiological profiles of the two cohorts, a highly specific, differentiated dosing protocol is implemented: Cohort A (adult functional fitness athletes) will receive a high-performance dose of 6 mg/kg body mass, while Cohort B (elite junior swimmers) will receive a safe, youth-adapted dose of 3 mg/kg body mass. In all experimental trials, the capsule is ingested exactly 60 minutes prior to the onset of the discipline-specific exercise test to match peak plasma caffeine concentration.
ダイエットサプリメント：Placebo (Nitrate-Depleted Beetroot Juice)
Nitrate-depleted beetroot juice (Beet It, James White Drinks Ltd., Ipswich, UK) administered as a 70 mL shot. This placebo is identical in taste, smell, appearance, packaging, and viscosity to the active concentrated shot, but has been selectively filtered to contain negligible nitrate levels (<0.4 mmol / ~25 mg of nitrates). It is ingested exactly 3 hours prior to the exercise test.
アクティブコンパレータ：PLCAF + BJ (Placebo CAF + Beetroot Juice)
Participants ingest a concentrated beetroot juice shot (~6.4 mmol / 400 mg nitrates) 3 hours before exercise, and a placebo capsule (maltodextrin) 60 minutes before exercise.
ダイエットサプリメント：Dietary Nitrate (Beetroot Juice)
Concentrated beetroot juice (BJ) administered as a single, acute organic shot of 70 mL (Beet It Sport, James White Drinks Ltd., Ipswich, UK). Each active shot contains approximately 400 mg (equivalent to ~6.4 mmol) of inorganic nitrate. In contrast to chronic loading designs, this study evaluates purely acute effects; the shot is ingested exactly 3 hours (180 minutes) prior to the physical performance test to align with peak systemic concentration of plasma nitrite.
ダイエットサプリメント：Placebo (Maltodextrin Capsule)
Placebo capsule containing inert maltodextrin powder. The capsule is identical in size, shape, weight, color (opaque), and texture to the active caffeine capsule to ensure robust blinding. It is administered at the exact same time point (60 minutes pre-exercise) according to the identical body-mass-adjusted dosing scheme (simulating either 3 mg/kg or 6 mg/kg).
プラセボコンパレーター：PLCAF + PLBJ (Double Placebo Control)
Participants ingest a nitrate-depleted beetroot juice shot (~0.04 mmol nitrates) 3 hours before exercise, and a placebo capsule (maltodextrin) 60 minutes before exercise.
ダイエットサプリメント：Placebo (Nitrate-Depleted Beetroot Juice)
Nitrate-depleted beetroot juice (Beet It, James White Drinks Ltd., Ipswich, UK) administered as a 70 mL shot. This placebo is identical in taste, smell, appearance, packaging, and viscosity to the active concentrated shot, but has been selectively filtered to contain negligible nitrate levels (<0.4 mmol / ~25 mg of nitrates). It is ingested exactly 3 hours prior to the exercise test.
ダイエットサプリメント：Placebo (Maltodextrin Capsule)
Placebo capsule containing inert maltodextrin powder. The capsule is identical in size, shape, weight, color (opaque), and texture to the active caffeine capsule to ensure robust blinding. It is administered at the exact same time point (60 minutes pre-exercise) according to the identical body-mass-adjusted dosing scheme (simulating either 3 mg/kg or 6 mg/kg).

この研究は何を測定していますか？

主要な結果の測定

主要な結果の測定

臨床研究のプロトコルにおいて、介入/治療の効果を評価するために最も重要な、計画された結果の尺度。ほとんどの臨床研究には 1 つの主要な結果の測定値がありますが、複数の測定値を持つものもあります。
結果測定
メジャーの説明
時間枠
Exercise Performance Time (minutes and seconds, Cohort A - Hyrox P'F'T)
時間枠：At each experimental visit (Visits T1-T4), with visits conducted at 7-day intervals following the baseline/familiarization visit (T0).
Total time (in minutes and seconds) required to complete the standardized HYROX Physical Fitness Test (P'F'T) consisting of 6 specific functional exercises.
At each experimental visit (Visits T1-T4), with visits conducted at 7-day intervals following the baseline/familiarization visit (T0).
Swimming Performance (minutes and seconds, Cohort B - 8x100m Step-Test)
時間枠：At each experimental visit (Visits T1-T4), with visits conducted at 7-day intervals following the baseline/familiarization visit (T0).
Swimming performance will be assessed using the completion time (seconds and milliseconds) for each 100-m repetition of the standardized 8 × 100-m step test, including the maximal-effort repetition performed during the fifth stage.
At each experimental visit (Visits T1-T4), with visits conducted at 7-day intervals following the baseline/familiarization visit (T0).

二次結果の測定

二次結果の測定

臨床研究のプロトコルにおいて、介入の効果を評価するための主要な結果測定ほど重要ではないが、依然として重要な計画された結果測定。ほとんどの臨床研究には、複数の副次的アウトカム指標があります。
結果測定
メジャーの説明
時間枠
Blood Lactate Kinetics (mmol/L)
時間枠：Before supplementation (baseline), pre-exercise (3 hours after beetroot juice supplementation and 30 minutes after caffeine supplementation), and 3 and 7 minutes after exercise at each experimental visit (Visits T1-T4; 7-day intervals).
Blood lactate concentration, including peak concentration, accumulation kinetics, and clearance rate, will be assessed from fingertip capillary blood collected before supplementation (baseline), pre-exercise (3 hours after beetroot juice supplementation and 30 minutes after caffeine supplementation), and post-exercise (3 and 7 minutes after exercise) at each experimental visit.
Before supplementation (baseline), pre-exercise (3 hours after beetroot juice supplementation and 30 minutes after caffeine supplementation), and 3 and 7 minutes after exercise at each experimental visit (Visits T1-T4; 7-day intervals).
Heart Rate (HR, bpm)
時間枠：Continuously monitored during exercise at each experimental visit (Visits T1-T4; 7-day intervals).
Real-time heart rate (beats per minute) will be continuously monitored throughout each exercise test using a telemetry-based heart rate monitoring system.
Continuously monitored during exercise at each experimental visit (Visits T1-T4; 7-day intervals).
Rating of Perceived Exertion (RPE, points)
時間枠：Immediately after exercise at each experimental visit (Visits T1-T4; 7-day intervals).
Subjective rating of perceived exertion will be assessed using the validated Borg Scale (6-20).
Immediately after exercise at each experimental visit (Visits T1-T4; 7-day intervals).
Blood Pressure (mmHg)
時間枠：Measured 2.5 hours after beetroot juice supplementation and 30 minutes after caffeine supplementation (pre-exercise) at each experimental visit (Visits T1-T4; 7-day intervals).
Systolic and diastolic blood pressure will be measured using an automated oscillometric blood pressure monitor.
Measured 2.5 hours after beetroot juice supplementation and 30 minutes after caffeine supplementation (pre-exercise) at each experimental visit (Visits T1-T4; 7-day intervals).
Gastrointestinal Tolerance Profile (mVAS, points)
時間枠：Measured 30 minutes after supplementation and immediately after exercise at each experimental visit (Visits T1-T4; 7-day intervals).
Gastrointestinal symptoms will be assessed using the modified Visual Analog Scale (mVAS; 0-10, where 0 = no symptoms and 10 = extremely severe symptoms).
Measured 30 minutes after supplementation and immediately after exercise at each experimental visit (Visits T1-T4; 7-day intervals).
White blood cells count and differential (count/L)
時間枠：Before supplementation (baseline) and 3 minutes after exercise at each experimental visit (Visits T1-T4; 7-day intervals).
Assessment of the hematological parameter will be performed from fingertip capillary blood collected before supplementation (baseline) and 3 minutes after exercise at each experimental visit.
Before supplementation (baseline) and 3 minutes after exercise at each experimental visit (Visits T1-T4; 7-day intervals).
White blood cells count and differential (%)
時間枠：Before supplementation (baseline) and 3 minutes after exercise at each experimental visit (Visits T1-T4; 7-day intervals).
Assessment of the hematological parameter will be performed from fingertip capillary blood collected before supplementation (baseline) and 3 minutes after exercise at each experimental visit.
Before supplementation (baseline) and 3 minutes after exercise at each experimental visit (Visits T1-T4; 7-day intervals).
Hematological indices (red blood cells, RBC) (count/L)
時間枠：Before supplementation (baseline) and 3 minutes after exercise at each experimental visit (Visits T1-T4; 7-day intervals).
Assessment of the hematological parameter will be performed from fingertip capillary blood collected before supplementation (baseline) and 3 minutes after exercise at each experimental visit.
Before supplementation (baseline) and 3 minutes after exercise at each experimental visit (Visits T1-T4; 7-day intervals).
Hematological indices (hemoglobin concentration, HGB) (mmol/L)
時間枠：Before supplementation (baseline) and 3 minutes after exercise at each experimental visit (Visits T1-T4; 7-day intervals).
Assessment of the hematological parameter will be performed from fingertip capillary blood collected before supplementation (baseline) and 3 minutes after exercise at each experimental visit.
Before supplementation (baseline) and 3 minutes after exercise at each experimental visit (Visits T1-T4; 7-day intervals).
Hematological indices (hematocrit, HCT) (L/L)
時間枠：Before supplementation (baseline) and 3 minutes after exercise at each experimental visit (Visits T1-T4; 7-day intervals).
Assessment of the hematological parameter will be performed from fingertip capillary blood collected before supplementation (baseline) and 3 minutes after exercise at each experimental visit.
Before supplementation (baseline) and 3 minutes after exercise at each experimental visit (Visits T1-T4; 7-day intervals).
Hematological indices (mean corpuscular volume, MCV; mean platelet volume, MPV) (fL)
時間枠：Before supplementation (baseline) and 3 minutes after exercise at each experimental visit (Visits T1-T4; 7-day intervals).
Assessment of the hematological parameter will be performed from fingertip capillary blood collected before supplementation (baseline) and 3 minutes after exercise at each experimental visit.
Before supplementation (baseline) and 3 minutes after exercise at each experimental visit (Visits T1-T4; 7-day intervals).
Hematological indices (mean corpuscular hemoglobin mass, MCH) (fmol)
時間枠：Before supplementation (baseline) and 3 minutes after exercise at each experimental visit (Visits T1-T4; 7-day intervals).
Assessment of the hematological parameter will be performed from fingertip capillary blood collected before supplementation (baseline) and 3 minutes after exercise at each experimental visit.
Before supplementation (baseline) and 3 minutes after exercise at each experimental visit (Visits T1-T4; 7-day intervals).
Hematological indices (mean corpuscular hemoglobin concentration, MCHC) (mmol/L)
時間枠：Before supplementation (baseline) and 3 minutes after exercise at each experimental visit (Visits T1-T4; 7-day intervals).
Assessment of the hematological parameter will be performed from fingertip capillary blood collected before supplementation (baseline) and 3 minutes after exercise at each experimental visit.
Before supplementation (baseline) and 3 minutes after exercise at each experimental visit (Visits T1-T4; 7-day intervals).
Hematological indices (platelet count, PLT) (count/L)
時間枠：Before supplementation (baseline) and 3 minutes after exercise at each experimental visit (Visits T1-T4; 7-day intervals).
Assessment of the hematological parameter will be performed from fingertip capillary blood collected before supplementation (baseline) and 3 minutes after exercise at each experimental visit.
Before supplementation (baseline) and 3 minutes after exercise at each experimental visit (Visits T1-T4; 7-day intervals).
Hematological indices (platelet hematocrit, PCT) (cL/L)
時間枠：Before supplementation (baseline) and 3 minutes after exercise at each experimental visit (Visits T1-T4; 7-day intervals).
Assessment of the hematological parameter will be performed from fingertip capillary blood collected before supplementation (baseline) and 3 minutes after exercise at each experimental visit.
Before supplementation (baseline) and 3 minutes after exercise at each experimental visit (Visits T1-T4; 7-day intervals).
Hematological indices (platelet distribution width, PDW; platelet large cell ratio, PLCR; red blood cells distribution width - coefficient of variation, RDW-C) (%)
時間枠：Before supplementation (baseline) and 3 minutes after exercise at each experimental visit (Visits T1-T4; 7-day intervals).
Assessment of the hematological parameter will be performed from fingertip capillary blood collected before supplementation (baseline) and 3 minutes after exercise at each experimental visit.
Before supplementation (baseline) and 3 minutes after exercise at each experimental visit (Visits T1-T4; 7-day intervals).
Hematological indices (red blood cells distribution width - standard deviation, RDW-S) (fL)
時間枠：Before supplementation (baseline) and 3 minutes after exercise at each experimental visit (Visits T1-T4; 7-day intervals).
Assessment of the hematological parameter will be performed from fingertip capillary blood collected before supplementation (baseline) and 3 minutes after exercise at each experimental visit.
Before supplementation (baseline) and 3 minutes after exercise at each experimental visit (Visits T1-T4; 7-day intervals).
Nutritional status indices (concentration of urea) (mmol/L)
時間枠：Before supplementation (baseline) at each experimental visit (Visits T1-T4; 7-day intervals).
Urea concentration will be assessed from fingertip capillary blood collected before supplementation (baseline).
Before supplementation (baseline) at each experimental visit (Visits T1-T4; 7-day intervals).
Creatinine Concentration (μmol/L)
時間枠：Before supplementation (baseline) at each experimental visit (Visits T1-T4; 7-day intervals).
Creatinine concentration will be assessed from fingertip capillary blood collected before supplementation (baseline).
Before supplementation (baseline) at each experimental visit (Visits T1-T4; 7-day intervals).
Muscle Damage Markers (ALT, AST, CK, LDH) (U/L)
時間枠：Before supplementation (baseline) at each experimental visit (Visits T1-T4; 7-day intervals).
Activities of alanine aminotransferase (ALT), aspartate aminotransferase (AST), creatine kinase (CK), and lactate dehydrogenase (LDH) will be assessed from fingertip capillary blood collected before supplementation (baseline).
Before supplementation (baseline) at each experimental visit (Visits T1-T4; 7-day intervals).
Body composition (fat-free mass, fat mass) (kg)
時間枠：Before supplementation (baseline) at each experimental visit (Visits T1-T4; 7-day intervals).
Body composition will be assessed before supplementation (baseline) using bioelectrical impedance analysis.
Before supplementation (baseline) at each experimental visit (Visits T1-T4; 7-day intervals).
Body composition (fat-free mass, fat mass) (%)
時間枠：Before supplementation (baseline) at each experimental visit (Visits T1-T4; 7-day intervals).
Body composition will be assessed before supplementation (baseline) using bioelectrical impedance analysis.
Before supplementation (baseline) at each experimental visit (Visits T1-T4; 7-day intervals).
Body composition (total body water) (L)
時間枠：Before supplementation (baseline) at each experimental visit (Visits T1-T4; 7-day intervals).
Body composition will be assessed before supplementation (baseline) using bioelectrical impedance analysis.
Before supplementation (baseline) at each experimental visit (Visits T1-T4; 7-day intervals).
Body composition (total body water) (%)
時間枠：Before supplementation (baseline) at each experimental visit (Visits T1-T4; 7-day intervals).
Body composition will be assessed before supplementation (baseline) using bioelectrical impedance analysis.
Before supplementation (baseline) at each experimental visit (Visits T1-T4; 7-day intervals).
Iron Status (Iron, Ferritin, UIBC, TIBC) (μg/dL)
時間枠：Before supplementation (baseline) at each experimental visit (Visits T1-T4; 7-day intervals).
Serum iron concentration, ferritin concentration, unsaturated iron-binding capacity (UIBC), and total iron-binding capacity (TIBC) will be assessed from fingertip capillary blood collected before supplementation (baseline).
Before supplementation (baseline) at each experimental visit (Visits T1-T4; 7-day intervals).
Iron Status (Transferrin Concentration) (g/L)
時間枠：Before supplementation (baseline) at each experimental visit (Visits T1-T4; 7-day intervals).
Serum transferrin concentration will be assessed from fingertip capillary blood collected before supplementation (baseline).
Before supplementation (baseline) at each experimental visit (Visits T1-T4; 7-day intervals).
Sleep Quality (Visual Analog Scale, VAS; points)
時間枠：Before supplementation (baseline), pre-exercise, and immediately after exercise at each experimental visit (Visits T1-T4; 7-day intervals).
Subjective sleep quality will be assessed using a Visual Analog Scale (VAS).
Before supplementation (baseline), pre-exercise, and immediately after exercise at each experimental visit (Visits T1-T4; 7-day intervals).
Mood (Brunel Mood Scale, BRUMS; points)
時間枠：Before supplementation (baseline), pre-exercise, and immediately after exercise at each experimental visit (Visits T1-T4; 7-day intervals).
Mood state will be assessed using the Brunel Mood Scale (BRUMS).
Before supplementation (baseline), pre-exercise, and immediately after exercise at each experimental visit (Visits T1-T4; 7-day intervals).
Competitive State Anxiety (Revised Competitive State Anxiety Inventory-2, CSAI-2R; points)
時間枠：Before supplementation (baseline), pre-exercise, and immediately after exercise at each experimental visit (Visits T1-T4; 7-day intervals).
Competitive state anxiety will be assessed using the Revised Competitive State Anxiety Inventory-2 (CSAI-2R).
Before supplementation (baseline), pre-exercise, and immediately after exercise at each experimental visit (Visits T1-T4; 7-day intervals).
Felt Arousal (Felt Arousal Scale, FAS; points)
時間枠：Before supplementation (baseline), pre-exercise, and immediately after exercise at each experimental visit (Visits T1-T4; 7-day intervals).
Perceived arousal will be assessed using the Felt Arousal Scale (FAS).
Before supplementation (baseline), pre-exercise, and immediately after exercise at each experimental visit (Visits T1-T4; 7-day intervals).
Feeling Scale (FS; points)
時間枠：Before supplementation (baseline), pre-exercise, and immediately after exercise at each experimental visit (Visits T1-T4; 7-day intervals).
Affective valence will be assessed using the Feeling Scale (FS).
Before supplementation (baseline), pre-exercise, and immediately after exercise at each experimental visit (Visits T1-T4; 7-day intervals).

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

スポンサー

研究を開始し、研究に対する権限と管理権を持つ組織または個人。
Poznan University of Physical Education

捜査官

捜査官

臨床研究に携わる研究者。関連用語には、施設主任研究者、施設副調査官、研究委員長、研究責任者、および研究主任研究者が含まれます。
  • 主任研究者：Natalia Główka, PhD、Poznan University of Physical Education, Department of Sports Dietetics

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)

研究開始

最初の参加者が臨床試験に登録された実際の日付。 「予想される」研究開始日は、研究者が研究開始日になると考える日付です。
2026年10月1日

一次修了 (推定)

一次修了

臨床研究の最後の参加者が検査された、または主要な結果測定のための最終データを収集するための介入を受けた日付。治験がプロトコルに従って終了したか終了したかは、この日付には影響しません。完了日が異なる複数の主要評価項目を含む臨床研究の場合、この用語は、すべての主要評価項目のデータ収集が完了した日付を指します。 「予想される」一次完了日は、研究者がその研究の一次完了日になると考える日付です。
2029年6月30日

研究の完了 (推定)

研究の完了

臨床研究の最後の参加者が検査された、または介入/治療を受けて、主要な結果の尺度、副次的な結果の尺度、および有害事象の最終データを収集した日付 (つまり、最後の参加者の最後の訪問)。 「予想される」研究完了日は、研究者が研究完了日になると考える日付です。
2029年6月30日

試験登録日

最初に提出

最初に提出

治験依頼者または治験責任医師が初めて治験記録を ClinicalTrials.gov に提出した日付。通常、最初の提出日と ClinicalTrials.gov での記録の利用可能日 (最初の投稿日) の間には数日の遅延があります。
2026年7月17日

QC基準を満たした最初の提出物

QC基準を満たした最初の提出物

研究スポンサーまたは治験責任医師が、国立医学図書館 (NLM) の品質管理 (QC) 審査基準と一致する研究記録を最初に提出した日付。治験依頼者または研究者は、NLM の QC 審査基準が満たされるまでに、研究記録を 1 回または複数回修正して提出する必要がある場合があります。研究記録がNLM QC審査基準と一致していることを確認するのは、治験依頼者または治験責任医師の責任です。
2026年7月31日

最初の投稿 (実際)

最初の投稿

国立医学図書館 (NLM) の品質管理 (QC) レビューが終了した後、ClinicalTrials.gov で研究記録が最初に利用可能になった日付。通常、治験依頼者または治験責任医師が治験記録を提出した日と最初に投稿された日との間には数日の遅延があります。
2026年8月5日

学習記録の更新

投稿された最後の更新 (実際)

投稿された最後の更新

ClinicalTrials.gov で、研究記録が変更された最新の日付。研究のスポンサーまたは治験責任医師によって変更が ClinicalTrials.gov に提出されたとき (最終更新が提出された日) と最終更新が投稿された日との間に遅延が生じる場合があります。
2026年8月7日

QC基準を満たした最後の更新が送信されました

QC基準を満たした最後の更新が送信されました

治験依頼者または治験責任医師が、国立医学図書館（NLM）の品質管理（QC）審査基準と一致する治験記録の変更を提出した最新の日付。研究記録がNLM QC審査基準と一致していることを確認するのは、治験依頼者または治験責任医師の責任です。
2026年8月6日

最終確認日

最終確認日

治験依頼者または治験責任医師が、ClinicalTrials.gov で臨床治験に関する情報が正確かつ最新であることを確認した最新の日付。募集ステータスが募集中の研究の場合。まだ募集していません。過去 2 年以内に募集が確認されていない場合、研究の募集状況は不明として表示されます。
2026年7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

その他の研究ID番号

NCT 番号以外の識別子または ID 番号で、治験依頼者、資金提供者、その他によって臨床治験に割り当てられたもの。これらの番号には、他の治験登録機関や国立衛生研究所の助成金番号からの一意の識別子が含まれる場合があります。
  • ZDS2026_NG_001

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 プランの説明

The study protocol will be published as an open-access article. Upon completion of the study, de-identified individual participant data (IPD) and relevant analytic code will be deposited in an open-access repository such as Zenodo or OSF, following the FAIR principles.

IPD 共有時間枠

The study protocol will be available upon its publication. The IPD and analytic code will be available starting from the date of the primary study results publication and will remain accessible for at least 5 years.

IPD 共有アクセス基準

The study protocol will be published as an open-access article. Upon completion of the study, de-identified individual participant data (IPD) and relevant analytic code will be deposited in an open-access repository such as Zenodo or OSF, in accordance with FAIR principles.

IPD 共有サポート情報タイプ

  • STUDY_PROTOCOL

医薬品およびデバイス情報、研究文書

米国FDA規制医薬品の研究

いいえ

米国FDA規制機器製品の研究

いいえ

この情報は、Web サイト clinicaltrials.gov から変更なしで直接取得したものです。研究の詳細を変更、削除、または更新するリクエストがある場合は、register@clinicaltrials.gov。 までご連絡ください。 clinicaltrials.gov に変更が加えられるとすぐに、ウェブサイトでも自動的に更新されます。

クッキーの設定

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