Anpassungen durch Krafttraining und Koffeinkonsum
Studie zu verschiedenen Koffein-Supplementierungsstrategien bei Widerstandstraining-induzierten Anpassungen
Studienübersicht
Status
Status
Bedingungen
Bedingungen
Intervention / Behandlung
Intervention / Behandlung
Detaillierte Beschreibung
Studientyp
Studientyp
Einschreibung (Tatsächlich)
Einschreibung
Phase
Phase
- Unzutreffend
Kontakte und Standorte
Studienkontakt
Studienkontakt
- Name: Abdullah Demirli, PhD
- Telefonnummer: +90 545 259 22 25
- E-Mail: abdullah.demirli@iuc.edu.tr
Studieren Sie die Kontaktsicherung
- Name: Kaan Kaya, PhD
- Telefonnummer: +90 546 876 0049
- E-Mail: kaan.kaya@yeniyuzyil.edu.tr
Studienorte
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Avcilar
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Istanbul, Avcilar, Türkei (türkiye), 34010
- Istanbul University-Cerrahpasa, Faculty of Sport Sciences Performance Laboratory
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Teilnahmekriterien
Zulassungskriterien
Zulassungskriterien
Studienberechtigtes Alter
- Erwachsene
Akzeptiert gesunde Freiwillige
Beschreibung
Einschlusskriterien:
- Männliches Geschlecht und Alter zwischen 18-30 Jahren
- Keine Vorgeschichte von Koffeinkonsum oder sehr niedrige gewohnheitsmäßige Aufnahme (<50 mg/Tag)
- Keine Teilnahme an einem regelmäßigen Krafttrainingsprogramm in den letzten 6 Monaten
- Body-Mass-Index (BMI) zwischen 18,5-30 kg/m2
- Bereitschaft, alle Trainings- und Testtermine regelmäßig wahrzunehmen
- Abgabe einer schriftlichen Einwilligungserklärung nach vollständiger Aufklärung über die Studie
Ausschlusskriterien:
- Vorliegen von Herz-Kreislauf-, Stoffwechsel-, Nieren-, Leber- oder anderen schwerwiegenden chronischen Erkrankungen
- Diagnostizierte psychiatrische Störungen oder schwere Koffeinunverträglichkeit/Allergie
- Einnahme von Medikamenten, die den Koffeinstoffwechsel oder den Muskelanabolismus beeinflussen (z.B. Betablocker, Antidepressiva, anabole Steroide)
- Muskuloskelettale Verletzungen, die ein sicheres Krafttraining verhindern
- Rauchen oder Alkoholkonsum in Mengen, die die Studienergebnisse beeinflussen könnten
- Gleichzeitige Teilnahme an einer anderen Trainingsinterventionsstudie
- Unfähigkeit, DXA-Scanning, Blutentnahme oder D2O-Einnahmeverfahren zu tolerieren
Studienplan
Wie ist die Studie aufgebaut?
Designdetails
- Hauptzweck: Grundlegende Wissenschaft
- Zuteilung: Zufällig
- Interventionsmodell: Parallele Zuordnung
- Maskierung: Verdreifachen
Anzahl der Arme
Waffen und Interventionen
Teilnehmergruppe / ArmTeilnehmergruppe / Arm |
Intervention / BehandlungIntervention / Behandlung |
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Experimental: Strategy 1: Constant Daily Dose
Participants receive caffeine at a constant daily dose of 4 mg/kg/day for 10 weeks.
Supervised resistance training is performed 3 times per week for 10 weeks.
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Oral caffeine capsule at 4 mg/kg body weight, consumed daily approximately 60 minutes before training sessions (on training days) or at the same time of day (on rest days).
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Experimental: Strategy 2: Escalating Dose
Participants receive caffeine at a gradually escalating dose, starting at 2 mg/kg/day in week 1 and increasing to 6 mg/kg/day by week 10 (1 mg/kg every 2 weeks).
Supervised resistance training is performed 3 times per week for 10 weeks.
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• Oral caffeine starting at 2 mg/kg/day and increasing incrementally to reach 6 mg/kg/day by week 10.
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Experimental: Strategy 3: Training Days Only
Participants receive caffeine at 4 mg/kg only on training days (3 times per week) for 10 weeks.
Supervised resistance training is performed 3 times per week for 10 weeks.
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Oral caffeine capsule at 4 mg/kg body weight, consumed only on training days approximately 60 minutes before exercise.
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Placebo-Komparator: Placebo
Participants receive 250 mg/day cellulose for 10 weeks.
Supervised resistance training is performed 3 times per week for 10 weeks.
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Oral placebo capsule (250 mg cellulose), consumed daily approximately 60 minutes before training sessions (on training days) or at the same time of day (on rest days).
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Was misst die Studie?
Primäre Ergebnismessungen
Primäre Ergebnismessungen
Ergebnis Maßnahme |
Maßnahmenbeschreibung |
Zeitfenster |
|---|---|---|
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Change in Lean Body Mass Measured by DXA
Zeitfenster: Baseline and post-test (after completing 10 weeks of interventions)
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Change in total lean body mass measured using dual-energy X-ray absorptiometry (DXA), reported in kilograms.
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Baseline and post-test (after completing 10 weeks of interventions)
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Change in Fat Mass Measured by DXA
Zeitfenster: Baseline and post-test (after completing 10 weeks of interventions)
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Change in fat mass measured using DXA.
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Baseline and post-test (after completing 10 weeks of interventions)
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Maximal Strength
Zeitfenster: Baseline, and post-test (after completing 10 weeks of interventions)
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Measure by one-repetition maximum (1-RM) on a lower body (Smith machine Back Squat) and two upper body (Bench Press machine and Lat Pulldown machine) exercises.
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Baseline, and post-test (after completing 10 weeks of interventions)
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Total Training Volume Load
Zeitfenster: During the intervention period (all training sessions).
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Total training volume load calculated as the sum of lifted load using the formula (kilograms × repetitions × sets) accumulated during each intervention period.
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During the intervention period (all training sessions).
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Change in Skeletal Muscle Thickness
Zeitfenster: Baseline and post-test (after completing 10 weeks of interventions)
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Change in skeletal muscle thickness measured using B-mode ultrasound, reported in mm.
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Baseline and post-test (after completing 10 weeks of interventions)
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Sekundäre Ergebnismessungen
Sekundäre Ergebnismessungen
Ergebnis Maßnahme |
Maßnahmenbeschreibung |
Zeitfenster |
|---|---|---|
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Muscular endurance
Zeitfenster: Baseline, and post-test (after completing 10 weeks of interventions)
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It will be measured by a repetitions-to-failure test on the Smith machine back squat using a load corresponding to 60% of the current 1RM.
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Baseline, and post-test (after completing 10 weeks of interventions)
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Neuromuscular function
Zeitfenster: Baseline and post-test (after completing 10 weeks of interventions)
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It will be measured by the countermovement jump (CMJ) test on a force platform.
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Baseline and post-test (after completing 10 weeks of interventions)
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Resting concentrations of testosterone
Zeitfenster: Baseline, and post-test (after completing 10 weeks of interventions)
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They will be measured using standard biochemical analyses.
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Baseline, and post-test (after completing 10 weeks of interventions)
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Plasma epinephrine responses to exercise
Zeitfenster: During the first training session of Week 1 and the final training session of Week 10, at three time points: (1) pre-supplementation, (2) immediately before exercise and (3) immediately after exercise.
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They will be measured using standard biochemical analyses.
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During the first training session of Week 1 and the final training session of Week 10, at three time points: (1) pre-supplementation, (2) immediately before exercise and (3) immediately after exercise.
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Recovery
Zeitfenster: Before each of the 30 training sessions during the study.
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It will be assessed using the validated 0-10 Perceived Recovery Status Scale (0 to 2: very poorly recovered, 3 to 4: poorly recovered, 5 to 6: adequately recovered, 7 to 8: well recovered, and 9 to 10: fully recovered).
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Before each of the 30 training sessions during the study.
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Adverse Events
Zeitfenster: From initiation of the 4-week caffeine abstinence period through completion of the post-intervention assessments, monitored throughout the study (approximately 16 weeks).
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Adverse events will be assessed using a standardized questionnaire administered throughout the study.
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From initiation of the 4-week caffeine abstinence period through completion of the post-intervention assessments, monitored throughout the study (approximately 16 weeks).
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Sleep quality
Zeitfenster: Baseline and post-test (after completing 10 weeks of interventions).
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It will be assessed by the Pittsburgh Sleep Quality Index (PSQI).
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Baseline and post-test (after completing 10 weeks of interventions).
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Rate of perceived exertion
Zeitfenster: After each supervised training session, participants were assessed throughout the 10-week intervention period (30 training sessions).
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Assessed using the Borg Category-Ratio (CR10) Scale, ranging from 0 ("nothing at all") to 10 ("maximal").
Participants will report their perceived exertion after each supervised training session.
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After each supervised training session, participants were assessed throughout the 10-week intervention period (30 training sessions).
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Resting concentrations of insulin-like growth factor-1 (IGF-1)
Zeitfenster: Baseline, and post-test (after completing 10 weeks of interventions)
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They will be measured using standard biochemical analyses.
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Baseline, and post-test (after completing 10 weeks of interventions)
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Resting concentrations of cortisol
Zeitfenster: Baseline, and post-test (after completing 10 weeks of interventions)
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They will be measured using standard biochemical analyses.
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Baseline, and post-test (after completing 10 weeks of interventions)
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Resting concentrations of creatine kinase
Zeitfenster: Baseline, and post-test (after completing 10 weeks of interventions)
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They will be measured using standard biochemical analyses.
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Baseline, and post-test (after completing 10 weeks of interventions)
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Serum cortisol responses to exercise
Zeitfenster: During the first training session of Week 1 and the final training session of Week 10, at three time points: (1) pre-supplementation, (2) immediately before exercise and (3) immediately after exercise.
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They will be measured using standard biochemical analyses.
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During the first training session of Week 1 and the final training session of Week 10, at three time points: (1) pre-supplementation, (2) immediately before exercise and (3) immediately after exercise.
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Plasma norepinephrine responses to exercise
Zeitfenster: During the first training session of Week 1 and the final training session of Week 10, at three time points: (1) pre-supplementation, (2) immediately before exercise and (3) immediately after exercise.
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They will be measured using standard biochemical analyses.
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During the first training session of Week 1 and the final training session of Week 10, at three time points: (1) pre-supplementation, (2) immediately before exercise and (3) immediately after exercise.
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Mitarbeiter und Ermittler
Sponsor
Sponsor
Mitarbeiter
Mitarbeiter
Publikationen und hilfreiche Links
Allgemeine Veröffentlichungen
- Guest NS, VanDusseldorp TA, Nelson MT, Grgic J, Schoenfeld BJ, Jenkins NDM, Arent SM, Antonio J, Stout JR, Trexler ET, Smith-Ryan AE, Goldstein ER, Kalman DS, Campbell BI. International society of sports nutrition position stand: caffeine and exercise performance. J Int Soc Sports Nutr. 2021 Jan 2;18(1):1. doi: 10.1186/s12970-020-00383-4.
- Lovallo WR, Whitsett TL, al'Absi M, Sung BH, Vincent AS, Wilson MF. Caffeine stimulation of cortisol secretion across the waking hours in relation to caffeine intake levels. Psychosom Med. 2005 Sep-Oct;67(5):734-9. doi: 10.1097/01.psy.0000181270.20036.06.
- Matsumura T, Takamura Y, Fukuzawa K, Nakagawa K, Nonoyama S, Tomoo K, Tsukamoto H, Shinohara Y, Iemitsu M, Nagano A, Isaka T, Hashimoto T. Ergogenic Effects of Very Low to Moderate Doses of Caffeine on Vertical Jump Performance. Int J Sport Nutr Exerc Metab. 2023 Jul 26;33(5):275-281. doi: 10.1123/ijsnem.2023-0061. Print 2023 Sep 1.
- Brook MS, Wilkinson DJ, Mitchell WK, Lund JN, Szewczyk NJ, Greenhaff PL, Smith K, Atherton PJ. Skeletal muscle hypertrophy adaptations predominate in the early stages of resistance exercise training, matching deuterium oxide-derived measures of muscle protein synthesis and mechanistic target of rapamycin complex 1 signaling. FASEB J. 2015 Nov;29(11):4485-96. doi: 10.1096/fj.15-273755. Epub 2015 Jul 13.
- Pickering C, Kiely J. Are low doses of caffeine as ergogenic as higher doses? A critical review highlighting the need for comparison with current best practice in caffeine research. Nutrition. 2019 Nov-Dec;67-68:110535. doi: 10.1016/j.nut.2019.06.016. Epub 2019 Jun 26.
- Grgic J, Trexler ET, Lazinica B, Pedisic Z. Effects of caffeine intake on muscle strength and power: a systematic review and meta-analysis. J Int Soc Sports Nutr. 2018 Mar 5;15:11. doi: 10.1186/s12970-018-0216-0. eCollection 2018.
- Grgic J, Grgic I, Pickering C, Schoenfeld BJ, Bishop DJ, Pedisic Z. Wake up and smell the coffee: caffeine supplementation and exercise performance-an umbrella review of 21 published meta-analyses. Br J Sports Med. 2020 Jun;54(11):681-688. doi: 10.1136/bjsports-2018-100278. Epub 2019 Mar 29.
Studienaufzeichnungsdaten
Haupttermine studieren
Studienbeginn (Tatsächlich)
Studienbeginn
Primärer Abschluss (Tatsächlich)
Primärer Abschluss
Studienabschluss (Tatsächlich)
Studienabschluss
Studienanmeldedaten
Zuerst eingereicht
Zuerst eingereicht
Zuerst eingereicht, das die QC-Kriterien erfüllt hat
Zuerst eingereicht, das die QC-Kriterien erfüllt hat
Zuerst gepostet (Tatsächlich)
Zuerst gepostet
Studienaufzeichnungsaktualisierungen
Letztes Update gepostet (Tatsächlich)
Letztes Update gepostet
Letztes eingereichtes Update, das die QC-Kriterien erfüllt
Letztes eingereichtes Update, das die QC-Kriterien erfüllt
Zuletzt verifiziert
Zuletzt verifiziert
Mehr Informationen
Begriffe im Zusammenhang mit dieser Studie
Schlüsselwörter
Zusätzliche relevante MeSH-Bedingungen
- Neurologische Manifestationen
- Erkrankungen des Nervensystems
- Neuromuskuläre Manifestationen
- Pathologische Zustände, Anatomisch
- Atrophie
- Pathologische Zustände, Anzeichen und Symptome
- Anzeichen und Symptome
- Hypertrophie
- Muskelatrophie
- Heterocyclische Verbindungen
- Heterocyclische Verbindungen, 2-Ring
- Heterocyclische Verbindungen, Fusionsring
- Alkaloide
- Purinonen
- Purines
- Xanthine
- Koffein
Andere Studien-ID-Nummern
Andere Studien-ID-Nummern
- 2026/01-1792
Plan für individuelle Teilnehmerdaten (IPD)
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Beschreibung des IPD-Plans
IPD-Sharing-Zeitrahmen
IPD-Sharing-Zugriffskriterien
Art der unterstützenden IPD-Freigabeinformationen
- STUDIENPROTOKOLL
- SAFT
- ANALYTIC_CODE
Arzneimittel- und Geräteinformationen, Studienunterlagen
Studiert ein von der US-amerikanischen FDA reguliertes Arzneimittelprodukt
Studiert ein von der US-amerikanischen FDA reguliertes Geräteprodukt
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