Motor Unit Activity During Fatiguing Low-Load Versus High-Load Resistance Training

Motor Unit Activity During Fatiguing Low-Load Versus High-Load Resistance Training

This study will utilize a repeated measures design in healthy adults between the ages of 18 and 35 years old. Following the determination of the participant’s 1RM during visit 1, EMG responses will be recorded during two conditions: 1) lifting weights with a light external load until exhaustion and 2) lifting weights with a very heavy external load until exhaustion. Each participant will undergo both conditions (i.e., one per visit) and the data will be compared. The order of experimental conditions will be randomized. All testing for each participant will be separated by at least 48 hours and will occur at the same time of day (± one hour). Individuals will be asked to refrain from upper-body exercise for 48 hours prior to each laboratory visit, avoid alcohol for 24 hours, and keep their caffeine, dietary, and sleep patterns consistent throughout the study.

Inclusion Qualifications:

  • Healthy men and women between 18 and 35 years of age will be recruited for this study.
  • Must have regularly participated in machine or barbell-based upper-body resistance training at least once per week over the previous six months.

Exclusion Qualifications:

You may not participate in this research opportunity if any of the following applies to you:
  • Do not meet the resistance training experience requirements (≥ one upper-body resistance training session per week over the previous six months)
  • Neuromuscular disease (e.g. Parkinson’s, MS, ALS)
  • Metabolic disease (e.g. diabetes, thyroid disorder, metabolic syndrome)
  • Injury or surgery to the upper-body within the previous year
  • Inability to perform upper-body exercises while standing
  • Tennis elbow (lateral epicondylitis)
  • Arthritis in the upper limbs (hands, arms, shoulders)
  • Trouble using or controlling one’s muscles
  • Use of anabolic steroids within the previous year
  • History of cancer
  • History of stroke
  • History of heart attack
  • Use of muscle relaxants or benzodiazepines
  • Allergy to rubbing alcohol
  • Any other health related illnesses that would prohibit a participant from physical performance testing
  • Lack of transportation to and from the laboratory

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UCF IRB#: STUDY00000730
PI: Matt Stock, PHD.
IRB Expiration August 8, 2020
Please consider subscribing to get notified about future research participation opportunities
Recruitment End Date:
October 3, 2021
UCF Partnership 1 Building
Room 221
Orlando, FL 32826
Time Commitment:
Number of visits: 3
Expected time per visit: 2 hours
Type: $10 Starbucks Card
Point of Contact:
Matt S. Stock
Faculty Advisors:
Matt Stock
Associated Units:
Exercise Physiology & Rehabilitation Science
Short URL:

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