Acute influence of a nutritional ergogenic aid on endurance performance – a placebo controlled double blind trial

Acute influence of a nutritional ergogenic aid on endurance performance – a placebo controlled double blind trial - NEP

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

DRKS

Registry ID

DRKS00005802

Enrollment

Registered

2014-02-24

Start date

2014-02-25

Completion date

Unknown

Last updated

2025-10-06

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Healthy ambitious bicyclists or triathletes

Interventions

Group 1: FS (food supplement) - 4.3g BCAA (Branched Chain Amino Acids) in pudding

one-time application 30 min before a 45 min time trial on an isokinetic bicycle ergometer. Group 2: CS (capsule supplement) - 4.3g BCAA (Branched Chain Amino Acids) in capsules

one-time application 30 min before a 45 min time trial on an isokinetic bicycle ergometer. Group 3: FP (food placebo) - pudding without BCAA (Branched Chain Amino Acids)

one-time application 30 min before a 45 min time trial on an isokinetic bicycle ergometer. Group 4: CP (capsule placebo) - capsules without BCAA (Branched Chain Amino Acids)

one-time application 30 min before a 45 min time trial on an isokinetic bicycle ergometer. Group 5: C (control) - no intervention before a 45 min time trial on an isokinetic bicycle ergometer.

Eligibility

Sex/Gender

Male

Age

18 Years to 45 Years

Inclusion criteria

Inclusion criteria: min. 3 bike training sessions during season and regular participation in competitions

Exclusion criteria

Exclusion criteria: There should be no serious illness or use of medication during the time of the study. Also, no complete training pause in the 4 weeks immediately prior to the study.

Design outcomes

Primary

Measure	Time frame
VO2 max, lactate threshold, power output and lactate values over 45min (isokinetic at 95 rpm), ratings of perceived exertion (RPE)	—

Secondary

Measure	Time frame
T1: German questionnaire determining expectations and experiences, current knowledge about supplements, demographic data, training schedule and nutrition. T2: HOSP (Beckmann, 2003) German questionnaire about action orientation in sports. AMS-Sport (Elbe, Wenhold & Müller, 2005) German questionnaire of performance motivation in sports. T3: SOQ (Elbe, 2001) Sport Orientiation Questionnaire by Gill und Deeter (1988). VKS (Wenhold et al., 2008) Volitional components in sports. T4: Interview regarding expectations, self-perception, performance perception, experience with the intervention.	—

Measure

Time frame

T1: German questionnaire determining expectations and experiences, current knowledge about supplements, demographic data, training schedule and nutrition. T2: HOSP (Beckmann, 2003) German questionnaire about action orientation in sports. AMS-Sport (Elbe, Wenhold & Müller, 2005) German questionnaire of performance motivation in sports. T3: SOQ (Elbe, 2001) Sport Orientiation Questionnaire by Gill und Deeter (1988). VKS (Wenhold et al., 2008) Volitional components in sports. T4: Interview regarding expectations, self-perception, performance perception, experience with the intervention.

—

Countries

Germany

Contacts

Public ContactEllen Kristina Broelz

Universitätsklinikum Tübingen, Abt. Innere Medizin VI - Psychosomatische Medizin und Psychotherapie

ellen.broelz@med.uni-tuebingen.de07071 29-89116

Outcome results

None listed

Source: DRKS (via WHO ICTRP) · Data processed: Feb 4, 2026