Eccentric strength training is gaining increased attention among active adults and fitness professionals due to its unique physiological effects and its potential to support strength and muscle development. Eccentric training involves lengthening the muscle under tension, such as when you slowly lower a dumbbell during a biceps curl. This guide explores how eccentric exercise differs from concentric training, its potential advantages, appropriate training methods, and key safety considerations—all based on recent peer-reviewed evidence.
What Is Eccentric Training?
Eccentric training focuses on the phase of muscle contraction where the muscle lengthens under load. Classic examples include the downward phase of a squat, the lowering phase of a pull-up, or the return phase after extending your leg on a leg press. In resistance training, this is also known as the 'negative' phase, with some practitioners referring to eccentric reps simply as "negative reps." Unlike traditional lifting where both raising (concentric) and lowering (eccentric) are given equal emphasis, eccentric strength training can place additional emphasis on the lowering phase, while specialised methods may overload it.
Research has demonstrated that programs emphasizing eccentric phases—especially when using loads beyond what can be lifted concentrically—can provide distinct training stimuli (Douglas et al., 2017). The findings depend on the exercises, participants and loading methods studied; they do not establish that every slower repetition is superior to conventional training.
Eccentric vs Concentric Contractions
The main difference between eccentric and concentric contractions lies in muscle action direction. Concentric contractions occur when a muscle shortens, as in curling a weight upward. Eccentric contractions see the muscle lengthen as it resists a force, such as lowering the weight back down. Eccentric actions can tolerate higher forces than concentric actions, but this does not make supramaximal loading an appropriate starting point for an inexperienced lifter (Douglas et al., 2017).
A 2026 review of eight randomised trials found improvements in strength and hypertrophy favouring eccentric training in the included comparisons, with substantial variation between trials (Maia et al., 2026). The populations included clinical groups and older adults, so the results should not be treated as a guarantee for every healthy gym-goer. Comparisons with concentric-only protocols are also different from comparing two complete programmes that already include both phases.
Potential Benefits
The primary documented benefits of eccentric strength training include:
- Greater strength gains – The 2026 meta-analysis reported strength and rate-of-force-development improvements in the comparisons studied (Maia et al., 2026).
- Muscle hypertrophy – While both eccentric and concentric training lead to increases in muscle size, the 2017 review found eccentric training at least as effective for increasing muscle cross-sectional area, with differences in the pattern of adaptation (Douglas et al., 2017).
- Enhanced functional fitness – The 2017 review reported improvements in power and stretch-shortening-cycle performance in some studies. Exercise selection and the testing task matter; effects are not automatically transferable to every sport.
- Blood pressure reduction – A 2023 review reported blood-pressure reductions in a small subset of participants, while the 2026 review found minimal cardiovascular effects. This mixed evidence does not justify using eccentric training as a substitute for blood-pressure treatment (Ansari et al., 2023).
Despite these advantages, glucose handling and broader metabolic health responses do not show a clear additional benefit for eccentric over concentric alone (Ansari et al., 2023).
Training Methods
Start by noticing the lowering phase of exercises you already perform, rather than adding an entirely new high-load session. For illustration, control the descent of a familiar dumbbell curl or bodyweight squat without deliberately making it exhausting. This is a practical example, not a validated optimal tempo prescription.
Eccentric training may be implemented using several practical strategies:
- Tempo training: Lengthen the eccentric phase (e.g., taking 3–5 seconds to lower a weight) to increase time under tension.
- Negative-only reps: Use a heavier load for the lowering phase—sometimes with a partner's assistance to return the weight for each rep.
- Plyometrics: Exercises such as depth jumps or drop landings place a strong accent on the active lengthening of muscle groups.
- Specialized equipment: Use of flywheel devices or eccentric-overload machines specifically designed to maximize the eccentric portion.
Regardless of method, ensure the selected approach matches your current strength and mobility capacity. Progressively increasing eccentric loads can offer significant returns, but unfamiliar high loads or volumes may produce substantial soreness and temporary strength loss.
Managing Muscle Soreness
Eccentric exercise is well known for causing substantial delayed-onset muscle soreness (DOMS), especially in those unfamiliar with this type of activity. This soreness typically peaks 24–72 hours after a session and may be more intense than what you experience after conventional strength training. A review of eccentric exercise risks and benefits discusses soreness after unfamiliar loading and adaptation with repeated exposure. Soreness is not a measure of how much muscle you will gain.
Strategies to manage and minimize DOMS from eccentric sessions include:
- Start with lighter loads and gradually progress intensity.
- Limit overall eccentric training volume for the first few weeks.
- Use comfortable light activity if desired; do not assume that stretching will prevent soreness.
- Allow sufficient rest between targeted muscle group eccentric sessions.
Some soreness is expected, but if pain limits daily movement or persists for a week or more, reduce load or frequency and review technique.
Progression and Load
The progression of eccentric loads should be gradual, as maximal or supramaximal work is not a sensible entry point for someone without experience and supervision. Start with a familiar exercise and a resistance you can control comfortably through its normal range of motion. The reviewed papers do not establish one starting percentage suitable for every beginner. More advanced trainees, or those using assistance, may progress to loads exceeding concentric maximums—but this requires caution and should be well supervised.
Load increases can be achieved by:
- Increasing external resistance
- Slowing the eccentric tempo
- Adding reps or sets with a focus on muscle control
Regularly assess recovery and performance, and only increase load when prior sessions do not elicit excessive soreness or technique breakdown.
Safety and Considerations
Suitability depends on the exercise, load, supervision and individual circumstances. However, due to the higher mechanical tension and muscle damage potential, unfamiliar sessions can produce marked soreness or temporary reductions in function, particularly when loading is excessive. Beginners should use conservative loading, practice good exercise technique, and allow ample recovery between sessions targeting the same muscle groups (Douglas et al., 2017).
Certain populations, such as older adults and those with chronic conditions (e.g., COPD), have seen beneficial adaptations from eccentric-focused protocols when loads are appropriately tailored (Maia et al., 2026). Always consult a qualified professional before significantly modifying your regimen. Watch for persistent muscle pain, significant weakness, or swelling—possible signs to scale back intensity or seek medical advice.
FAQs
What is eccentric training in simple terms?
Eccentric training means focusing on the part of an exercise where your muscles lengthen under tension—for example, when slowly lowering a weight or controlling your descent in a squat or push-up.
How does eccentric exercise benefit muscle growth and strength?
Research supports eccentric exercise as a useful strength-training stimulus. Some comparisons favour it for strength or muscle size, but results vary with the programme and population. More soreness or muscle damage does not guarantee better growth.
How should I progress eccentric loads safely?
Begin with a familiar exercise and a load you can control comfortably. Adjust one factor at a time, such as repetitions or resistance, and monitor form, recovery and how the next session feels.
When should I use eccentric-focused training?
It can be included as part of a balanced strength programme when it fits your goal and experience. Injury rehabilitation needs an individual professional plan; a general article cannot prescribe tendon treatment.