Isometric vs Concentric Exercise: Which is Better for Strength and Rehabilitation?
When it comes to strength training, most people are familiar with dynamic movements such as lifting, pushing, or pulling. These are known as concentric exercises, where the muscle shortens under load. Less well known, but equally valuable, are isometric exercises, where the muscle contracts without movement. Both have a place in training and rehabilitation, but each offers distinct benefits.
What Are Isometric Exercises?
Isometric exercises involve holding a muscle contraction without changing the joint angle. Examples include a plank, wall sit, or pushing against an immovable object.
Key characteristic: maximum effort without movement.
What Are Concentric Exercises?
Concentric exercises are the more familiar “lifting” phase of strength training, where the muscle shortens while generating force. Examples include lifting a dumbbell during a bicep curl or rising from a squat.
Key characteristic: movement against resistance.
Benefits of Isometric Exercise
Joint-Friendly Strength Training
No movement means less shear force on the joints, making isometrics highly effective in rehabilitation and when pain limits motion.
High Muscle Activation
Isometric contractions can recruit a very high percentage of motor units, often comparable to heavy lifting, without external load.
Efficient Strength Gains
Holding contractions at 70–80% effort for 30–45 seconds builds measurable strength, especially at specific joint angles.
Safe in Sensitive Conditions
Useful in tendon rehabilitation and early post-injury phases, where dynamic loading could aggravate tissues.
Pain Reduction
Research suggests isometric exercise can reduce pain perception in tendon-related injuries by modulating neural inhibition.
Limitations of Isometric Training
Strength gains are angle-specific: benefits occur mainly at the joint position being trained, with limited carryover.
Less effective for improving dynamic movements compared to concentric and eccentric exercise.
Why Use Concentric Exercise?
Concentric training builds dynamic strength and functional capacity, essential for everyday activities and sport performance. It helps improve coordination, endurance, and muscle growth.
Choosing the Right Approach
Isometric exercise is ideal for:
Painful joints or tendon issues
Early-stage rehabilitation
People needing strength with minimal joint strain
Concentric exercise is ideal for:
Improving dynamic, functional movement
Building muscle mass and endurance
Long-term athletic performance
Conclusion
Both isometric and concentric exercises play important roles in strength training and rehabilitation. Isometric work provides a safe, joint-friendly way to build strength and reduce pain, especially when dynamic movement is limited. Concentric exercise, on the other hand, develops the dynamic strength required for daily function and athletic performance.
For the best outcomes, a tailored program that combines both approaches—guided by an experienced practitioner—delivers the most balanced and sustainable results.
References
American College of Sports Medicine (ACSM). (2009). Progression models in resistance training for healthy adults. Medicine & Science in Sports & Exercise, 41(3), 687–708.
Enoka, R. M., & Duchateau, J. (2016). Translating fatigue to human performance. Medicine & Science in Sports & Exercise, 48(11), 2228–2238.
Oranchuk, D. J., Storey, A. G., Nelson, A. R., & Cronin, J. B. (2019). Isometric training and long-term adaptations: Effects of muscle length, intensity, and intent: A systematic review. Scandinavian Journal of Medicine & Science in Sports, 29(4), 484–503.
Rio, E., Kidgell, D., Purdam, C., Gaida, J., Moseley, G. L., Pearce, A. J., & Cook, J. (2015). Isometric exercise induces analgesia and reduces inhibition in patellar tendinopathy. British Journal of Sports Medicine, 49(19), 1277–1283.
Schoenfeld, B. J. (2010). The mechanisms of muscle hypertrophy and their application to resistance training. Journal of Strength and Conditioning Research, 24(10), 2857–2872.
Suchomel, T. J., Nimphius, S., & Stone, M. H. (2016). The importance of muscular strength in athletic performance. Sports Medicine, 46(10), 1419–1449.