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The First-Night Effect and Sex Differences in Strength and Muscular Endurance Performance

NCT07758166 · Status: COMPLETED · Phase: NA · Type: INTERVENTIONAL · Enrollment: 32

Last updated 2026-08-11

No results posted yet for this study

Summary

Introduction: The first-night effect, characterized by disturbed sleep in an unfamiliar environment, may impair next-day physical performance. However, whether this response differs between men and women remains unclear. This study investigated sex differences in the effects of sleeping in an unfamiliar environment on strength and muscular endurance in resistance-trained individuals.

Methods: Thirty-two resistance-trained participants (16 women, 16 men; 23 ± 4 years) completed a randomized, counterbalanced crossover study involving two conditions: sleeping for 8 h at home or in the laboratory. The following morning, participants performed bench press and back squat strength tests across 25-90%1RM, followed by muscular endurance tests to failure at 65%1RM.

Conditions

  • Sleep

Interventions

BEHAVIORAL

First-Night Effect at the laboratory

Participants sleep 8h at the laboratory

BEHAVIORAL

first-night effect (at home)

Participants sleep 8h at home

Sponsors & Collaborators

  • University of Alcala

    lead OTHER

Study Design

Allocation
RANDOMIZED
Purpose
OTHER
Masking
SINGLE
Model
CROSSOVER

Eligibility

Min Age
18 Years
Max Age
40 Years
Sex
ALL
Healthy Volunteers
Yes

Timeline & Regulatory

Start
2024-02-07
Primary Completion
2025-12-20
Completion
2026-05-03

Countries

  • Spain

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT07758166 on ClinicalTrials.gov