12 Participants Needed

Eccentric Resistance Exercise for Skeletal Muscle Response

SM
Overseen ByStephen M Cornish, PhD
Age: 18 - 65
Sex: Any
Trial Phase: Academic
Sponsor: University of Manitoba
No Placebo GroupAll trial participants will receive the active study treatment (no placebo)

What You Need to Know Before You Apply

What is the purpose of this trial?

This trial aims to understand how thigh muscles react to eccentric resistance exercise, which involves lengthening the muscle while it contracts. Researchers measure certain biomarkers in the muscle to assess how this exercise affects muscle inflammation. Individuals aged 18-35 who are healthy and engage in regular moderate to vigorous exercise may be suitable for this study.

As an unphased study, this trial offers a unique opportunity to contribute to the scientific understanding of muscle health and exercise.

Will I have to stop taking my current medications?

The trial information does not specify whether you need to stop taking your current medications.

What prior data suggests that this exercise protocol is safe?

Research has shown that eccentric resistance exercise is generally safe. However, incorrect execution can lead to muscle soreness and even muscle damage. This exercise involves stretching the muscle while it is working, which can challenge the muscles. Some studies have found that after just one session, participants might feel more tired or experience temporary muscle weakness. Despite these effects, eccentric exercise is known to improve strength and some heart health markers over time. Following the exercise instructions carefully can reduce potential discomfort.12345

Why are researchers excited about this trial?

Researchers are excited about eccentric resistance exercise for muscle response because it focuses on the lengthening phase of muscle contraction, which is different from traditional resistance exercises that emphasize muscle shortening. This method uses an isokinetic dynamometer to perform 300 eccentric knee extensions, potentially offering a more efficient way to build muscle strength and mass. Unlike typical resistance exercises that can lead to quicker fatigue, eccentric training might allow for greater muscle overload with less energy expenditure, making it a promising alternative for improving muscle health and rehabilitation outcomes.

What evidence suggests that eccentric resistance-exercise is effective for skeletal muscle response?

Research shows that eccentric resistance exercise, which participants in this trial will perform, can increase muscle strength and function. This type of exercise has improved strength in various groups, including stroke patients. Eccentric exercise involves muscles lengthening as they contract, leading to better strength gains compared to traditional exercises. Studies have found that it can also benefit heart health. Overall, eccentric resistance training effectively boosts muscle performance and strength.14567

Who Is on the Research Team?

SM

Stephen M Cornish, PhD

Principal Investigator

University of Manitoba

Are You a Good Fit for This Trial?

This trial is for individuals who are interested in participating in a study to understand how their thigh muscles respond after doing specific resistance exercises that involve muscle lengthening during contraction. The details about who can join or reasons why someone might not be able to participate are not provided.

Inclusion Criteria

Healthy
Recreationally active (≥ 150 minutes of moderate to vigorous physical activity per week for at least the past three months)

Exclusion Criteria

Answered 'yes' to the Get Active Questionnaire which screens for health conditions that may affect exercise ability

Timeline for a Trial Participant

Screening

Participants are screened for eligibility to participate in the trial

1 week

Pre-Exercise Rest

Participants rest for 30 minutes before exercise and provide a baseline muscle biopsy

30 minutes
1 visit (in-person)

Exercise

Participants perform 300 repetitions of maximal isokinetic eccentric knee extensions

1 session
1 visit (in-person)

Post-Exercise Rest

Participants rest for 3 hours post-exercise before a second muscle biopsy is taken

3 hours
1 visit (in-person)

Follow-up

Participants are monitored for safety and effectiveness after the exercise intervention

1 week

What Are the Treatments Tested in This Trial?

Interventions

  • Eccentric resistance-exercise
Trial Overview The study is testing the body's response, specifically looking at inflammation markers called myokines, released by thigh muscles after a session of eccentric resistance-exercise using specialized gym equipment known as an isokinetic dynamometer.
How Is the Trial Designed?
1Treatment groups
Experimental Treatment
Group I: Eccentric ExerciseExperimental Treatment1 Intervention

Find a Clinic Near You

Who Is Running the Clinical Trial?

University of Manitoba

Lead Sponsor

Trials
628
Recruited
209,000+

Published Research Related to This Trial

Unilateral eccentric-only training significantly increased eccentric strength in both the trained limb (29% increase) and the untrained limb (17% increase) after eight weeks of training, indicating a cross-training effect.
The gains in eccentric strength were maintained even after eight weeks of detraining, suggesting that this type of training can lead to lasting improvements in muscle strength.
Effects of eccentric-only resistance training and detraining.Housh, TJ., Housh, DJ., Weir, JP., et al.[2004]
Isokinetic dynamometers, like the Biodex, can effectively measure increased muscle stiffness after eccentric exercises, as shown by a 52% increase in passive resistive torque (PRT) in a study of nine young women.
This method provides a promising way to assess group changes in muscle stiffness due to eccentric exercise, but further research is needed to confirm its reliability for individual assessments.
Passive resistive torque of the plantar flexors following eccentric loading as assessed by isokinetic dynamometry.Porter, MM., Andersson, M., Hellström, U., et al.[2013]
In a study involving 22 young men, both isoload (IL) and isokinetic (IK) eccentric exercises resulted in similar levels of muscle damage and neuromuscular function changes, indicating that the type of resistance exercise may not significantly affect acute muscle responses.
Both exercise modalities led to comparable decreases in voluntary isometric peak torque, muscle soreness, and creatine kinase activity, suggesting that either method can be effectively used without major differences in immediate muscle recovery outcomes.
Neuromuscular Changes and Damage after Isoload versus Isokinetic Eccentric Exercise.Doguet, V., Nosaka, K., Plautard, M., et al.[2018]

Citations

Eccentric Resistance Exercise for Skeletal Muscle ResponseResearch shows that eccentric resistance exercise can increase muscle strength and function, as seen in studies with stroke patients and other training programs ...
effect of isokinetic eccentric resistance training on strength ...Eccentric strength training for the shoulder shows significant improvements in muscle strength and muscle architecture, without decreasing the shoulder ...
The Health and Functional Benefits of Eccentric versus ...Eccentric exercise is effective for improving strength and some markers of cardiovascular health compared to traditional exercise modalities.
Eccentric-Only Versus Concentric-Only Isokinetic Strength ...A meta-analysis of 11 studies with 20 comparisons did not show statistically significantly different effects between eccentric and concentric ...
Eccentric Resistance Training: A Methodological Proposal ...This review presents a methodological proposal for classifying eccentric exercises based on complexity, objectives, methods, and intensity.
Effects of once- versus twice-weekly eccentric resistance ...One weekly submaximal eccentric resistance training session over 12 weeks elicits similar improvements in neuromuscular function compared to the currently ...
Symptomatic and Functional Responses to Concentric- ...Our results indicated more pronounced functional deficits occurred after a single bout of ECC isotonic exercise than with a CON-ECC isokinetic exercise protocol ...
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