Caffeinated Gum Use and Volleyball Performance
15 maj 2026 uppdaterad av: Gülbin Rudarlı, Ege University
Acute Effects of Caffeinated Gum Use on Volleyball Performance: A Randomized, Placebo-Controlled Crossover Trial
This study examined the acute effects of caffeinated chewing gum on volleyball performance in trained female volleyball players. Caffeine is commonly used by athletes to improve performance, but less is known about whether caffeinated gum is useful during volleyball-specific activity.
Participants completed three testing sessions in a randomized crossover design. In one session, they chewed placebo gum. In another session, they chewed caffeinated gum containing a single 300 mg dose of caffeine. In the third session, they received the same total amount of caffeine as three separate 100 mg doses given at 30-minute intervals.
The study assessed volleyball-specific skill performance, including attack, block, and defense efficiency, during a volleyball-specific skill game. Vertical jump height, heart rate, perceived exertion, side effects, and condition guessing were also recorded.
Studieöversikt
Status
Avslutad
Betingelser
Intervention / Behandling
Detaljerad beskrivning
This randomized, placebo-controlled, crossover study investigated whether the pattern of caffeinated gum administration affects volleyball-specific performance in trained female volleyball players. Participants completed one familiarization session and three experimental sessions separated by one week. The experimental conditions were placebo gum, single-dose caffeinated gum, and partial-dose caffeinated gum.
In the single-dose condition, participants chewed three pieces of caffeinated gum containing a total of 300 mg caffeine for 5 minutes. In the partial-dose condition, participants chewed one piece of caffeinated gum containing 100 mg caffeine at three different time points, with 30-minute intervals between doses. In the placebo condition, participants chewed caffeine-free gum for 5 minutes.
Each testing session included volleyball-specific activities and a 30-minute volleyball-specific skill game. Attack, block, and defense efficiency were assessed using video recordings and Data Volley software. Vertical jump height was measured before and after the volleyball-specific activity. Heart rate was recorded during the session, and rating of perceived exertion was assessed before and after the session. Participants were also asked to report side effects and to guess which condition they had received after each session.
Studietyp
Interventionell
Inskrivning (Faktisk)
11
Fas
- Inte tillämpbar
Kontakter och platser
Det här avsnittet innehåller kontaktuppgifter för dem som genomför studien och information om var denna studie genomförs.
Studieorter
-
-
Bornova
-
Izmir, Bornova, Turkiet (Türkiye), 35040
- Ege University, Faculty of Sport Sciences
-
-
Deltagandekriterier
Forskare letar efter personer som passar en viss beskrivning, så kallade behörighetskriterier. Några exempel på dessa kriterier är en persons allmänna hälsotillstånd eller tidigare behandlingar.
Urvalskriterier
Åldrar som är berättigade till studier
- Vuxen
Tar emot friska volontärer
Ja
Beskrivning
Inclusion Criteria:
- Female volleyball players aged 18 to 35 years.
- Apparently healthy.
- Daily caffeine intake ≤300 mg.
- Minimum of 5 years of regular volleyball training experience.
- Training for at least 120 minutes at least 3 days per week.
- Competing in national or international volleyball matches.
- Provided written informed consent before participation.
Exclusion Criteria:
- Serious injury or trauma within the past 6 months that could affect volleyball performance.
- Illness or inability to continue the study protocol during the research period.
- Development of side effects during caffeinated gum administration that prevented continuation.
- Regular alcohol or drug use that could affect the study outcomes.
Studieplan
Det här avsnittet ger detaljer om studieplanen, inklusive hur studien är utformad och vad studien mäter.
Hur är studien utformad?
Designdetaljer
- Primärt syfte: Övrig
- Tilldelning: Randomiserad
- Interventionsmodell: Crossover tilldelning
- Maskning: Dubbel
Vapen och interventioner
Deltagargrupp / Arm |
Intervention / Behandling |
|---|---|
|
Experimentell: Placebo, Single-Dose Caffeine, Partial-Dose Caffeine Arm Type: Experimental
Participants received placebo gum in the first session, single-dose caffeinated gum in the second session, and partial-dose caffeinated gum in the third session.
Sessions were separated by one week.
|
Participants chewed three pieces of caffeinated gum containing 100 mg caffeine per piece, providing a total dose of 300 mg caffeine.
The gum was chewed for 5 minutes and then discarded.
Andra namn:
Participants received three separate pieces of caffeinated gum containing 100 mg caffeine per piece.
One piece was chewed for 5 minutes at each administration time point, with doses given at 30-minute intervals, providing a total dose of 300 mg caffeine.
Andra namn:
Participants chewed caffeine-free placebo gum for 5 minutes.
The placebo gum was selected to be similar in shape and color to the caffeinated gum.
Andra namn:
|
|
Experimentell: Placebo, Partial-Dose Caffeine, Single-Dose Caffeine
Participants received placebo gum in the first session, partial-dose caffeinated gum in the second session, and single-dose caffeinated gum in the third session.
Sessions were separated by one week.
|
Participants chewed three pieces of caffeinated gum containing 100 mg caffeine per piece, providing a total dose of 300 mg caffeine.
The gum was chewed for 5 minutes and then discarded.
Andra namn:
Participants received three separate pieces of caffeinated gum containing 100 mg caffeine per piece.
One piece was chewed for 5 minutes at each administration time point, with doses given at 30-minute intervals, providing a total dose of 300 mg caffeine.
Andra namn:
Participants chewed caffeine-free placebo gum for 5 minutes.
The placebo gum was selected to be similar in shape and color to the caffeinated gum.
Andra namn:
|
|
Experimentell: Single-Dose Caffeine, Placebo, Partial-Dose Caffeine
Participants received single-dose caffeinated gum in the first session, placebo gum in the second session, and partial-dose caffeinated gum in the third session.
Sessions were separated by one week.
|
Participants chewed three pieces of caffeinated gum containing 100 mg caffeine per piece, providing a total dose of 300 mg caffeine.
The gum was chewed for 5 minutes and then discarded.
Andra namn:
Participants received three separate pieces of caffeinated gum containing 100 mg caffeine per piece.
One piece was chewed for 5 minutes at each administration time point, with doses given at 30-minute intervals, providing a total dose of 300 mg caffeine.
Andra namn:
Participants chewed caffeine-free placebo gum for 5 minutes.
The placebo gum was selected to be similar in shape and color to the caffeinated gum.
Andra namn:
|
|
Experimentell: Single-Dose Caffeine, Partial-Dose Caffeine, Placebo
Participants received single-dose caffeinated gum in the first session, partial-dose caffeinated gum in the second session, and placebo gum in the third session.
Sessions were separated by one week.
|
Participants chewed three pieces of caffeinated gum containing 100 mg caffeine per piece, providing a total dose of 300 mg caffeine.
The gum was chewed for 5 minutes and then discarded.
Andra namn:
Participants received three separate pieces of caffeinated gum containing 100 mg caffeine per piece.
One piece was chewed for 5 minutes at each administration time point, with doses given at 30-minute intervals, providing a total dose of 300 mg caffeine.
Andra namn:
Participants chewed caffeine-free placebo gum for 5 minutes.
The placebo gum was selected to be similar in shape and color to the caffeinated gum.
Andra namn:
|
|
Experimentell: Partial-Dose Caffeine, Placebo, Single-Dose Caffeine
Participants received partial-dose caffeinated gum in the first session, placebo gum in the second session, and single-dose caffeinated gum in the third session.
Sessions were separated by one week.
|
Participants chewed three pieces of caffeinated gum containing 100 mg caffeine per piece, providing a total dose of 300 mg caffeine.
The gum was chewed for 5 minutes and then discarded.
Andra namn:
Participants received three separate pieces of caffeinated gum containing 100 mg caffeine per piece.
One piece was chewed for 5 minutes at each administration time point, with doses given at 30-minute intervals, providing a total dose of 300 mg caffeine.
Andra namn:
Participants chewed caffeine-free placebo gum for 5 minutes.
The placebo gum was selected to be similar in shape and color to the caffeinated gum.
Andra namn:
|
|
Experimentell: Partial-Dose Caffeine, Single-Dose Caffeine, Placebo
Participants received partial-dose caffeinated gum in the first session, single-dose caffeinated gum in the second session, and placebo gum in the third session.
Sessions were separated by one week.
|
Participants chewed three pieces of caffeinated gum containing 100 mg caffeine per piece, providing a total dose of 300 mg caffeine.
The gum was chewed for 5 minutes and then discarded.
Andra namn:
Participants received three separate pieces of caffeinated gum containing 100 mg caffeine per piece.
One piece was chewed for 5 minutes at each administration time point, with doses given at 30-minute intervals, providing a total dose of 300 mg caffeine.
Andra namn:
Participants chewed caffeine-free placebo gum for 5 minutes.
The placebo gum was selected to be similar in shape and color to the caffeinated gum.
Andra namn:
|
Vad mäter studien?
Primära resultatmått
Resultatmått |
Åtgärdsbeskrivning |
Tidsram |
|---|---|---|
|
Attack efficiency
Tidsram: During the 30-minute volleyball-specific skill game in each experimental trial
|
Attack efficiency was assessed during a 30-minute volleyball-specific skill game using video recordings and Data Volley software.
Values were expressed as percentages.
|
During the 30-minute volleyball-specific skill game in each experimental trial
|
|
Block efficiency
Tidsram: During the 30-minute volleyball-specific skill game in each experimental trial
|
Block efficiency was assessed during a 30-minute volleyball-specific skill game using video recordings and Data Volley software.
Values were expressed as percentages.
|
During the 30-minute volleyball-specific skill game in each experimental trial
|
|
Defense efficiency
Tidsram: During the 30-minute volleyball-specific skill game in each experimental trial
|
Defense efficiency was assessed during a 30-minute volleyball-specific skill game using video recordings and Data Volley software.
Values were expressed as percentages.
|
During the 30-minute volleyball-specific skill game in each experimental trial
|
Sekundära resultatmått
Resultatmått |
Åtgärdsbeskrivning |
Tidsram |
|---|---|---|
|
Change in vertical jump height
Tidsram: From immediately before to immediately after each experimental trial
|
Vertical jump height was measured before and after each experimental testing session using a photoelectric cell system.
Values were expressed in centimeters.
|
From immediately before to immediately after each experimental trial
|
|
Heart rate
Tidsram: Continuously during each experimental trial
|
Heart rate was recorded during each experimental testing session using a telemetric heart rate monitoring system.
Values were expressed as beats per minute.
|
Continuously during each experimental trial
|
|
Change in rating of perceived exertion
Tidsram: From immediately before to immediately after each experimental trial
|
Rating of perceived exertion was assessed before and after each experimental testing session using a 0-10 Borg scale.
|
From immediately before to immediately after each experimental trial
|
Andra resultatmått
Resultatmått |
Åtgärdsbeskrivning |
Tidsram |
|---|---|---|
|
Side effects
Tidsram: Immediately after each experimental trial
|
Participants were asked after each experimental testing session whether they experienced any side effects or discomfort related to the gum intervention.
Reported responses were recorded descriptively.
|
Immediately after each experimental trial
|
Samarbetspartners och utredare
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Sponsor
Studieavstämningsdatum
Dessa datum spårar framstegen för inlämningar av studieposter och sammanfattande resultat till ClinicalTrials.gov. Studieposter och rapporterade resultat granskas av National Library of Medicine (NLM) för att säkerställa att de uppfyller specifika kvalitetskontrollstandarder innan de publiceras på den offentliga webbplatsen.
Studera stora datum
Studiestart (Faktisk)
5 augusti 2025
Primärt slutförande (Faktisk)
23 april 2026
Avslutad studie (Faktisk)
23 april 2026
Studieregistreringsdatum
Först inskickad
11 maj 2026
Först inskickad som uppfyllde QC-kriterierna
15 maj 2026
Första postat (Faktisk)
19 maj 2026
Uppdateringar av studier
Senaste uppdatering publicerad (Faktisk)
19 maj 2026
Senaste inskickade uppdateringen som uppfyllde QC-kriterierna
15 maj 2026
Senast verifierad
1 maj 2026
Mer information
Termer relaterade till denna studie
Andra studie-ID-nummer
- EGE-25-9.1T-28
Plan för individuella deltagardata (IPD)
Planerar du att dela individuella deltagardata (IPD)?
NEJ
IPD-planbeskrivning
Individual participant data will not be shared because the dataset contains participant-level performance and physiological data from a small group of elite female volleyball players, which may increase the risk of participant identification.
Läkemedels- och apparatinformation, studiedokument
Studerar en amerikansk FDA-reglerad läkemedelsprodukt
Nej
Studerar en amerikansk FDA-reglerad produktprodukt
Nej
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