Related Experiment Video
Updated: May 11, 2026
14:10
Isometric and Eccentric Force Generation Assessment of Skeletal Muscles Isolated from Murine Models of Muscular Dystrophies
Published on: January 31, 2013
Isokinetic eccentric resistance training prevents loss in mechanical muscle function after running
Anderson Souza Oliveira1, Fabrizio Caputo, Per Aagaard
1Human Performance Laboratory, São Paulo State University, UNESP, Av. 24 A, 1515, Bela Vista, Rio Claro, SP, CEP-13506-900, Brazil.
European Journal of Applied Physiology
|May 18, 2013
Summary
Maximal isokinetic eccentric resistance training (IERT) reduces strength loss after high-intensity running. This training may protect against muscle fatigue and damage, allowing for more intense running workouts and better adaptation.
Area of Science:
- Sports Medicine
- Exercise Physiology
- Muscle Physiology
Background:
- High-intensity running causes significant muscle fatigue and force loss.
- Eccentric muscle actions are particularly vulnerable to exercise-induced damage.
- Resistance training may offer protective effects against exercise-induced fatigue and muscle damage.
Purpose of the Study:
- To investigate if 8 weeks of maximal isokinetic eccentric resistance training (IERT) reduces acute force loss after high-intensity treadmill running.
- To test the hypothesis that IERT induces protective effects against muscle fatigue and ultrastructural damage.
- To evaluate the impact of IERT on mechanical muscle function recovery post-running.
Main Methods:
- Subjects underwent isokinetic and isometric knee extensor strength testing before and after an IERT protocol.
- Participants performed high-intensity treadmill running, with strength measurements repeated immediately after.
- Subjects were randomized into a training group (24 IERT sessions) or a control group.
- Evaluated changes in peak torque and rate of force development (RFD) post-running and post-training.
Main Results:
- Before IERT, running caused an 8% loss in eccentric torque and an 11% loss in RFD at 180° s(-1).
- After IERT, running-induced eccentric torque loss was reduced (2% increase), significantly different from pre-training values (p < 0.05).
- RFD loss remained significant (-11%) post-running, even after the IERT intervention (p > 0.05).
Conclusions:
- IERT can mitigate strength decrements following high-intensity running exercise.
- This suggests IERT may provide protective benefits against running-induced fatigue and muscle damage.
- However, IERT does not prevent reductions in explosive muscle actions (RFD), potentially allowing for greater training loads and adaptations.
More Related Videos
Related Concept Videos
01:27Exercise and Muscle Performance
Exercise induces a range of adaptations in muscle tissue, depending on the type and duration of activity. Such physical training can be broadly categorized into two types: endurance exercises and resistance exercises.
Endurance exercises
Endurance exercises involve running, swimming, or cycling, which require repetitive movements with low force output. When a person engages in endurance exercise, a few noticeable changes occur in their skeletal muscles. For instance, the number of capillaries...
Endurance exercises
Endurance exercises involve running, swimming, or cycling, which require repetitive movements with low force output. When a person engages in endurance exercise, a few noticeable changes occur in their skeletal muscles. For instance, the number of capillaries...
01:22Isotonic and Isometric Muscle Contractions
Two primary types of muscle contractions are isotonic and isometric, each serving unique functions and involving distinct mechanisms. Both isotonic and isometric contractions are integral to the body's complex system of movement and stability. Isotonic exercises contribute significantly to functional strength and movement, while isometric contractions are crucial for maintaining posture and joint stability.
Isotonic contractions
Isotonic contractions occur when a muscle changes length while the...
Isotonic contractions
Isotonic contractions occur when a muscle changes length while the...
01:20Exercise and Cardiovascular Response
Exercise significantly impacts cardiovascular response, which is crucial for understanding patient health and designing effective treatment plans.
Light to moderate physical activity initiates a series of interconnected responses in the body. The heart rate modestly increases in anticipation of the workout, followed by widespread vasodilation as oxygen consumption by skeletal muscles increases. This results in decreased peripheral resistance, increased capillary blood flow, and accelerated...
Light to moderate physical activity initiates a series of interconnected responses in the body. The heart rate modestly increases in anticipation of the workout, followed by widespread vasodilation as oxygen consumption by skeletal muscles increases. This results in decreased peripheral resistance, increased capillary blood flow, and accelerated...
01:24Muscle Recovery and Fatigue
Muscle fatigue refers to the decline in a muscle's ability to maintain the force of contraction after prolonged activity. It primarily stems from changes within muscle fibers. Even before experiencing muscle fatigue, one may feel tired and have the urge to stop the activity. This response, known as central fatigue, occurs due to changes in the central nervous system, namely the brain and spinal cord. While there is no single mechanism that induces fatigue, it may serve as a protective response...