Time of Day Effects of Handgrip Fatiguing Protocol

Time of Day Effects of Handgrip Fatiguing Protocol

The purpose of this study is to examine the effects of time of day on an intermittent handgrip fatiguing protocol. This protocol consists of repeated maximal effort isometric contractions using a handgrip dynamometer.

This study will consist of five visits. The first visit will consist of informed consent, questionnaires, demographics, and ultrasound images of the forearm. The second visit will consist of anthropometrics (height, weight, and body composition), followed by familiarization with the study protocol. The third, fourth, and fifth visits will be testing visits and will consist of the brief mood introspection scale, maximal voluntary contractions (MVC) with the handgrip dynamometer, the intermittent handgrip fatiguing protocol, and three recovery MVCs. Temperature and muscle tissue oxygenation will also be assessed via a skin temperature probe and near infrared spectroscopy (NIRS).

Visits 3-5 must be completed at different times of the day in a pre-determined randomized order. This may look like:
A) 9:00am, 2:00pm, 7:00pm
B) 2:00pm, 7:00pm, 9:00am
C) 7:00pm, 9:00am, 2:00pm

All visits will be separated by at least 24-48 hours. Each visit will take approximately 30-45 minutes.

Inclusion Qualifications:

  • Male or female between the ages of 18-55 years old
  • Healthy as determined by the PAR-Q+
  • English speaking

Exclusion Qualifications:

You may not participate in this research opportunity if any of the following applies to you:
  • Physical limitations that prevent individuals from completing the maximal effort handgrip protocol.
  • Concerns regarding health status indicated on the PAR-Q+.
  • Traveling across any time zone in the past two weeks.
  • Non-binary gender identity or gender identity not consistent with biological sex
  • Use of hormone therapy within the past 6 months

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UCF IRB#: STUDY00004620
PI: Justine Renziehausen
IRB Expiration August 19, 2023
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Recruitment End Date:
March 7, 2023
Education Complex
4000 Central Florida Blvd.
174 (POWER lab)
Orlando, FL 32816
Time Commitment:
Number of visits: 5
Expected time per visit: 45 minutes
Point of Contact:
Justine Renziehausen
Faculty Advisors:
David Fukuda
Associated Units:
Exercise Physiology & Rehabilitation Science
Related Tags:
Short URL:

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