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.
- 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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PI: Justine Renziehausen
IRB Expiration August 19, 2023
March 7, 2023
4000 Central Florida Blvd.
174 (POWER lab)
Orlando, FL 32816
Number of visits: 5
Expected time per visit: 45 minutes
Exercise Physiology & Rehabilitation Science
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