Investigation of the Effects of Chronotype Differences on Balance and Muscle Strength in Young Adults (Chronotype)

The aim of this study is to investigate the effects of chronotype differences on balance and muscle strength in young adults. Chronotypes of all participants will be determined using the Morningness-Eveningness Questionnaire. All assessment measurements determined for young adult individuals will be performed first at 09:00 in the morning and then again at 19:00 in the evening.

Study Overview

• Status: Active, not recruiting
• Conditions: Chronotype
• Intervention / Treatment: Other: Morning chronotype; Other: Evening chronotype

Detailed Description

The aim of this study is to investigate the effects of chronotype differences on balance and muscle strength in young adults. Inclusion criteria are being between 45-65 years old, not having any neurological or orthopedic disorders, not having a vestibular disease that causes balance problems. Exclusion criteria are trauma history, anatomical deformities and skeletal system fractures, having a previous injury, and the presence of pain that will prevent participation in the tests. Chronotypes of all participants will be determined using the Morningness-Eveningness Questionnaire. All assessment measurements determined for young adult individuals will be performed first at 09:00 in the morning and then again at 19:00 in the evening. Muscle strength and balance assessments made in the morning and evening will be compared. Chronotypes of the participants will be evaluated with the Morningness-Eveningness Questionnaire, their balance will be evaluated with the One-Legged Standing Test, lower extremity muscle strength with a myometer, and their functionality will be evaluated with the Timed Stand-Up-Sit Test and the 30-Second Sit-Up Test.

• Study Type: Interventional
• Enrollment (Estimated): 40
• Phase: Not Applicable

Contacts and Locations

Study Locations

• Turkey
  • Istanbul, Turkey
    • İstanbul Medipol University

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult; Older Adult
• Accepts Healthy Volunteers: Yes

Description

Inclusion Criteria:

• being between 45-65,
• not having any neurological or orthopedic disorder,
• not having a vestibular disease that causes balance problems.

Exclusion Criteria:

• trauma history,
• anatomical deformities and skeletal system fractures,
• having a previous injury and the presence of pain that would prevent participation in the tests.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: Single

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Morning chronotype group; All assessment measurements determined for individuals with morning chronotype will be performed first at 09:00 in the morning and then again at 19:00 in the evening.	Other: Morning chronotype; All assessment measurements determined for individuals with morning chronotype will be performed first at 09:00 in the morning and then again at 19:00 in the evening. Muscle strength balance assessments performed in the morning and evening will be compared.
Experimental: Evening chronotype group; All assessment measurements determined for individuals with evening chronotype will be performed first at 09:00 in the morning and then again at 19:00 in the evening.	Other: Evening chronotype; All assessment measurements determined for individuals with evening chronotype will be performed first at 09:00 in the morning and then again at 19:00 in the evening. Muscle strength balance assessments performed in the morning and evening will be compared.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Morningness-Eveningness Questionnaire	A questionnaire form that determines morningness and eveningness types will be used to subjectively evaluate circadian rhythm. defi - nitely morning type (70-86), moderately morning type (59-69), neither type (42-58), moderately evening type (31-41), and defi nitely evening type (16-30).	20 minutes
Single-leg standing test	This test measures a person's standing ability and balance.	20 minutes
Muscle strength test	Myometry will be used to objectively measure the strength of the quadriceps and hamstring muscles. Myometry is an evaluation method that objectively evaluates muscle strength and provides more sensitive results than manual muscle testing.	20 minutes
Timed up and go testTest:	A simple screening test that provides a sensitive and specific measure of fall risk and balance in older adults.	20 minutes
30 Second Sit-to-Stand Test	A test that evaluates the participant's sit-to-stand activity, lower extremity muscle strength and balance status.	20 minutes

Collaborators and Investigators

• Sponsor: Istanbul Medipol University Hospital
• Investigators: Principal Investigator: MERVE YILMAZ MENEK, Assoc. Prof., Medipol University

Publications and helpful links

General Publications

• Facer-Childs ER, Boiling S, Balanos GM. The effects of time of day and chronotype on cognitive and physical performance in healthy volunteers. Sports Med Open. 2018 Oct 24;4(1):47. doi: 10.1186/s40798-018-0162-z.

Helpful Links

• The effects of time of day and chronotype on cognitive and physical performance in healthy volunteers

Study record dates

Study Major Dates

• Study Start (Actual): April 22, 2025
• Primary Completion (Estimated): June 10, 2025
• Study Completion (Estimated): July 10, 2025

Study Registration Dates

• First Submitted: April 22, 2025
• First Submitted That Met QC Criteria: April 22, 2025
• First Posted (Actual): April 29, 2025

Study Record Updates

• Last Update Posted (Actual): May 30, 2025
• Last Update Submitted That Met QC Criteria: May 26, 2025
• Last Verified: May 1, 2025

More Information

Terms related to this study

• Keywords: muscle strength; functionality; balance; Chronotype
• Other Study ID Numbers: E-10840098-772.02-7691; Istanbul Medipol University (Other Identifier: Istanbul Medipol University Ethics Committee Decision No: 855/2021)

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO
• IPD Plan Description: We can share IPD when it isi necessary.

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No