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Placebo Effect in Field-Based Physical Performance

2026년 7월 31일 업데이트: Poznan University of Physical Education

Psychophysiological Mechanisms of the Placebo Effect on Physical Performance in Field Settings

This study aims to investigate the placebo (PLA) effect on physical performance across different sports disciplines in real-world, field-based settings. The study investigates how participant expectations and beliefs regarding caffeine (CAF) intake influence physical performance and psychomotor function outside the controlled laboratory environment. Healthy, physically active adults (n = 120) from diverse sports backgrounds will be randomly assigned to receive caffeine, placebo, or no intervention. Participants will perform discipline-specific field exercise tests (e.g., running-based protocols or repeated sprint protocols) while physiological responses are monitored using wearable technology. Physical performance outcomes and psychomotor responses will be analyzed to evaluate the real-world impact of the placebo effect and to distinguish the pharmacological effects of caffeine from those driven by psychological expectations across different athletic settings.

연구 개요

상태

아직 모집하지 않음

정황

개입 / 치료

상세 설명

This study employs a cross-sectional design conducted in diverse field settings to investigate the placebo (PLA) effect across different sports disciplines. Participants (n = 120, aged 20-35 years) representing different training profiles (endurance and mixed) will be randomly assigned to one of three parallel groups: Caffeine, Placebo, or Control. Each participant will complete a single experimental session lasting approximately 35 minutes, consisting of: (1) baseline psychomotor assessment using the Simple Reaction Time test, (2) a discipline-specific exercise protocol (e.g., the Cooper test performed on an athletics track or a Repeated Sprint Ability protocol), and (3) post-exercise recovery monitoring. Physiological parameters, including heart rate (HR), heart rate variability (HRV), and respiratory rate (RR), together with postural stability, will be continuously monitored using wearable technology. The study will evaluate how psychological expectations influence physical performance, psychomotor function, and physiological responses during sport-specific exercise, providing evidence for the role of the placebo effect under real-world athletic conditions.

연구 유형

중재적

등록 (추정된)

120

단계

  • 해당 없음

연락처 및 위치

이 섹션에서는 연구를 수행하는 사람들의 연락처 정보와 이 연구가 수행되는 장소에 대한 정보를 제공합니다.

연구 연락처

연구 장소

  • 폴란드
    • Greater Poland Voivodeship
      • Poznan, Greater Poland Voivodeship, 폴란드
        • Poznań University of Physical Education
        • 연락하다:

참여기준

연구원은 적격성 기준이라는 특정 설명에 맞는 사람을 찾습니다. 이러한 기준의 몇 가지 예는 개인의 일반적인 건강 상태 또는 이전 치료입니다.

자격 기준

공부할 수 있는 나이

  • 성인

건강한 자원 봉사자를 받아들입니다

예

설명

Inclusion Criteria:

  • Age between 20 and 35 years,
  • Healthy adults,
  • Regular physical activity,
  • Normal or corrected-to-normal vision,
  • Habitual caffeine consumption.

Exclusion Criteria:

  • History of neurological, psychiatric, cardiovascular, or metabolic disorders,
  • Current use of medication or supplements affecting the central nervous system,
  • Musculoskeletal injuries that would impair physical performance,
  • No habitual caffeine consumption or severe negative side effects of caffeine,
  • Diagnosed sleep disorders or chronic fatigue,
  • Diagnosed major depressive disorder or other severe psychiatric conditions,
  • Presence of any menstrual disorders,
  • Inability to attend all experimental study visits.

공부 계획

이 섹션에서는 연구 설계 방법과 연구가 측정하는 내용을 포함하여 연구 계획에 대한 세부 정보를 제공합니다.

연구는 어떻게 설계됩니까?

디자인 세부사항

  • 주 목적: 기초 과학
  • 할당: 무작위
  • 중재 모델: 병렬 할당
  • 마스킹: 네 배로

무기와 개입

참가자 그룹 / 팔
개입 / 치료
실험적: Caffeine Group
Participants ingest a single dose of caffeine (6mg/kg body mass) prior to a field-based exercise protocol (e.g., Cooper test or Repeated Sprint Ability).
의약품: Caffeine (6mg/kg)
Anhydrous caffeine administered in an encapsulated form at a dosage of 6mg per kilogram of body mass, 30-60 minutes before the exercise protocol.
활성 비교기: Placebo Group
Participants ingest a single dose of placebo (corn starch) in an identical capsule prior to a field-based exercise protocol.
다른: Placebo (Starch capsule)
Corn starch administered in an identical encapsulated form as the active caffeine, 30-60 minutes before the exercise protocol.
가짜 비교기: Control Group
Participants perform the same field-based exercise protocol without ingesting any capsule or active substance.
다른: Sham (No Treatment)
Participants perform the same exercise protocols without any capsule or substance administration.

연구는 무엇을 측정합니까?

주요 결과 측정

결과 측정
측정값 설명
기간
Physical Performance Capacity (total distance in running, metres)
기간: Measured during the exercise protocol immediately following administration of the study intervention.
Total physical work capacity measured as the total running distance (metres) completed during the standardized exercise protocol.
Measured during the exercise protocol immediately following administration of the study intervention.
Physical Performance Capacity (total work in Joules for cycling)
기간: Measured during the exercise protocol immediately following administration of the study intervention.
Total physical work capacity measured as the total mechanical work (Joules) completed during the standardized cycling exercise protocol.
Measured during the exercise protocol immediately following administration of the study intervention.
Physical Performance Capacity (exercise duration until exhaustion, minutes)
기간: Measured during the exercise protocol immediately following administration of the study intervention.
Total physical work capacity measured as exercise duration until volitional exhaustion during the standardized exercise protocol.
Measured during the exercise protocol immediately following administration of the study intervention.

2차 결과 측정

결과 측정
측정값 설명
기간
Exercise Heart Rate (bpm)
기간: Continuously monitored during the exercise protocol immediately following administration of the study intervention.
Heart rate (beats per minute) recorded continuously throughout the standardized exercise protocol.
Continuously monitored during the exercise protocol immediately following administration of the study intervention.
Cognitive Heart Rate (bpm)
기간: Measured during cognitive testing immediately before and immediately after the exercise protocol.
Heart rate recorded during standardized cognitive performance tasks.
Measured during cognitive testing immediately before and immediately after the exercise protocol.
Post-Exercise Heart Rate Recovery (bpm)
기간: Continuously monitored during the first 5 minutes immediately following completion of the exercise protocol.
Heart rate recorded during the post-exercise recovery period.
Continuously monitored during the first 5 minutes immediately following completion of the exercise protocol.
Cognitive Reaction Time (ms)
기간: Measured immediately before and immediately after the exercise protocol.
Reaction time measured during standardized cognitive tasks (e.g., Psychomotor Vigilance Test, Stroop Test, Flanker Test).
Measured immediately before and immediately after the exercise protocol.
Rating of Perceived Exertion (Borg Scale, points)
기간: Measured immediately after completion of the exercise protocol.
Perceived exertion assessed using the Borg Rating of Perceived Exertion Scale (6-20).
Measured immediately after completion of the exercise protocol.
Biomechanical Kinematic Profile (cm)
기간: Continuously monitored during the exercise protocol immediately following administration of the study intervention.
Continuous recording of kinematic parameters derived from wearable sensors, including step length and vertical oscillation.
Continuously monitored during the exercise protocol immediately following administration of the study intervention.
Biomechanical Kinematic Profile (ms)
기간: Continuously monitored during the exercise protocol immediately following administration of the study intervention.
Continuous recording of stance time derived from wearable sensor data.
Continuously monitored during the exercise protocol immediately following administration of the study intervention.
Biomechanical Kinematic Profile (steps/min)
기간: Continuously monitored during the exercise protocol immediately following administration of the study intervention.
Continuous recording of cadence derived from wearable sensor data.
Continuously monitored during the exercise protocol immediately following administration of the study intervention.
Anthropometric Indices (kg)
기간: Measured at the start of the protocol.
Body mass expressed in kilograms.
Measured at the start of the protocol.
Anthropometric Indices (m)
기간: Measured at the start of the protocol.
Height expressed in metres.
Measured at the start of the protocol.
Body composition (fat-free mass, fat mass) (kg)
기간: Measured at the start of the protocol.
Assessment of body composition (fat-free mass, fat mass) (kg) will be performed at the start of the protocol.
Measured at the start of the protocol.
Body composition (fat-free mass, fat mass) (%)
기간: Measured at the start of the protocol.
Assessment of body composition (fat-free mass, fat mass) (%) will be performed at the start of the protocol.
Measured at the start of the protocol.
Body composition (total body water) (L)
기간: Measured at the start of the protocol.
Assessment of body composition (total body water) (L) will be performed at baseline at the start of the protocol.
Measured at the start of the protocol.
Body composition (total body water) (%)
기간: Measured at the start of the protocol.
Assessment of body composition (total body water) (%) will be performed at baseline at the start of the protocol.
Measured at the start of the protocol.
Exercise Heart Rate Variability (ms)
기간: Continuously monitored during the exercise protocol immediately following administration of the study intervention.
Heart rate variability recorded continuously throughout the standardized exercise protocol to assess autonomic regulation.
Continuously monitored during the exercise protocol immediately following administration of the study intervention.
Cognitive Heart Rate Variability (ms)
기간: Measured during cognitive testing immediately before and immediately after the exercise protocol.
Heart rate variability recorded during standardized cognitive performance tasks.
Measured during cognitive testing immediately before and immediately after the exercise protocol.
Post-Exercise Heart Rate Variability Recovery (ms)
기간: Continuously monitored during the first 5 minutes immediately following completion of the exercise protocol.
Heart rate variability recorded during the post-exercise recovery period.
Continuously monitored during the first 5 minutes immediately following completion of the exercise protocol.
Cognitive Accuracy (%)
기간: Measured immediately before and immediately after the exercise protocol.
Accuracy measured during standardized cognitive tasks (e.g., Psychomotor Vigilance Test, Stroop Test, Flanker Test).
Measured immediately before and immediately after the exercise protocol.
Performance Expectancy (points)
기간: Measured immediately after completion of the exercise protocol.
Measured immediately before the exercise protocol following administration of the study intervention.
Measured immediately after completion of the exercise protocol.

공동 작업자 및 조사자

여기에서 이 연구와 관련된 사람과 조직을 찾을 수 있습니다.

스폰서

Poznan University of Physical Education

수사관

  • 수석 연구원: Jakub Malik, PhD, Poznan University of Physical Education, Department of Sports Psychology

연구 기록 날짜

이 날짜는 ClinicalTrials.gov에 대한 연구 기록 및 요약 결과 제출의 진행 상황을 추적합니다. 연구 기록 및 보고된 결과는 공개 웹사이트에 게시되기 전에 특정 품질 관리 기준을 충족하는지 확인하기 위해 국립 의학 도서관(NLM)에서 검토합니다.

연구 주요 날짜

연구 시작 (추정된)

2026년 9월 1일

기본 완료 (추정된)

2028년 3월 31일

연구 완료 (추정된)

2029년 3월 31일

연구 등록 날짜

최초 제출

2026년 7월 21일

QC 기준을 충족하는 최초 제출

2026년 7월 31일

처음 게시됨 (실제)

2026년 8월 3일

연구 기록 업데이트

마지막 업데이트 게시됨 (실제)

2026년 8월 3일

QC 기준을 충족하는 마지막 업데이트 제출

2026년 7월 31일

마지막으로 확인됨

2026년 7월 1일

추가 정보

이 연구와 관련된 용어

키워드

추가 관련 MeSH 약관

기타 연구 ID 번호

  • 152-1-26
  • 2025/57/N/NZ4/04470 (기타 보조금/기금 번호: National Science Centre)

개별 참가자 데이터(IPD) 계획

개별 참가자 데이터(IPD)를 공유할 계획입니까?

미정

IPD 계획 설명

The decision regarding the sharing of individual participant data has not yet been finalized. We are currently evaluating the feasibility, ethical considerations, and data privacy requirements for potential data sharing. A formal plan will be developed and implemented in accordance with institutional policies and regulatory standards upon the completion of the study.

약물 및 장치 정보, 연구 문서

미국 FDA 규제 의약품 연구

아니

미국 FDA 규제 기기 제품 연구

아니

이 정보는 변경 없이 clinicaltrials.gov 웹사이트에서 직접 가져온 것입니다. 귀하의 연구 세부 정보를 변경, 제거 또는 업데이트하도록 요청하는 경우 register@clinicaltrials.gov. 문의하십시오. 변경 사항이 clinicaltrials.gov에 구현되는 즉시 저희 웹사이트에도 자동으로 업데이트됩니다. .

구독하다