Eccentric Training: Why the Lowering Phase Matters and How to Use It

# Eccentric Training: Why the Lowering Phase Matters and How to Use It

Every rep has two phases: the concentric (lifting the weight, muscle shortening) and the eccentric (lowering the weight, muscle lengthening under tension). Most lifters focus almost entirely on the concentric — the press, the pull, the ascent from a squat. The eccentric is the afterthought, the part where the weight is brought back to start.

This is a significant oversight. Research consistently shows that the eccentric phase produces unique physiological effects, including greater force generation, superior hypertrophic stimulus in some contexts, and specific injury prevention and rehabilitation benefits. Understanding and deliberately training the eccentric is one of the most underutilized tools in resistance training.

Eccentric vs. Concentric Force Production

A fundamental principle of muscle physiology is that muscles can produce more force eccentrically than concentrically. The mechanical reason: during eccentric contractions, the sliding filaments of the sarcomere do not shorten — they lengthen while maintaining cross-bridge connections — creating more force per cross-bridge than occurs during concentric shortening. Additionally, the elastic components of connective tissue contribute to eccentric force, further increasing total output.

In practice, the eccentric maximum is approximately 20–40% higher than the concentric maximum. If your 1RM bench press is 100 kg, you could likely lower 120–140 kg under control eccentrically.

This force production difference has training implications:

• Supramaximal eccentric training (loading beyond concentric max) is a specialized technique used in strength sports and rehabilitation
• Standard resistance training only trains the concentric fully; the eccentric is often under-loaded relative to its capacity when lifters lower the weight rapidly

Eccentric Loading and Hypertrophy

Research consistently demonstrates that the eccentric phase contributes significantly to hypertrophy, potentially more so than the concentric phase at equivalent loads.

A 2012 study by Roig et al. in the *European Journal of Applied Physiology* found that eccentric-only training produced significantly greater muscle hypertrophy than concentric-only training in untrained individuals. The proposed mechanisms:

Greater mechanical tension: Because muscle can generate more force eccentrically, the tensile stress per fiber is higher during eccentric contractions, potentially creating a stronger mTORC1-mediated hypertrophic signal.

Greater muscle damage: Eccentric contractions produce more structural disruption to the sarcomere than concentric contractions — visible as Z-disc streaming under electron microscopy. This damage activates satellite cells and stimulates the repair process that contributes to muscle growth (though muscle damage is now understood to be a contributing factor, not the primary driver of hypertrophy).

Stretch-mediated hypertrophy: More recent research has focused on the relationship between muscle length and hypertrophy stimulus. A 2019 study by Oranchuk et al. in the *Scandinavian Journal of Medicine and Science in Sports* found that training at longer muscle lengths — which corresponds to the eccentric and stretched portion of movement — may produce hypertrophy specifically in the distal regions of muscle bellies. This "stretch-mediated hypertrophy" has been replicated in several subsequent studies and suggests that full eccentric range of motion, and potentially emphasizing the bottom of movements, is hypertrophically advantageous.

Practical Eccentric Training Methods

Tempo Training

The most accessible approach: deliberately control the eccentric phase with a specific tempo. Common prescriptions:

• 3-second eccentric: A 3-second lowering on every rep of squats, bench press, or rows. This roughly doubles typical eccentric duration for most lifters and significantly increases time under tension.
• 4–5 second eccentric: Used in more specific hypertrophy programs and rehabilitation contexts.

Research by Burd et al. (2012) in the *Journal of Physiology* found that slow-tempo contractions with time under tension >6 seconds per rep elevated muscle protein synthesis significantly more than very fast contractions at the same overall load, providing mechanistic support for tempo training as a hypertrophy tool.

How to implement: Choose a tempo, write it into your program, and time it. The most common mistake is thinking you're doing a 3-second eccentric when you're actually doing 1.5 seconds. A stopwatch or explicit counting eliminates this.

Eccentric Overload (Supramaximal Eccentric)

Loading the eccentric phase heavier than the concentric max using one of several methods:

• Partner-assisted eccentrics: A partner adds resistance during the lowering phase, removed for the concentric
• Eccentric hooks: Devices that attach to barbells and allow weight to be released after the concentric, increasing load for the eccentric
• Accommodating resistance (bands): Bands attached in specific orientations add resistance during the eccentric
• Accentuated eccentrics: Lowering a heavier load than you can concentrically lift, using a technique like lowering a barbell under control that required two hands to lift (applicable to some machine and cable setups)

These methods are more advanced and carry higher injury risk — the greater forces require excellent technique and connective tissue readiness.

Eccentric-Only Training

Training exclusively the eccentric phase has specific applications, particularly in rehabilitation (the Alfredson protocol for Achilles tendinopathy, for example). For healthy athletes, eccentric-only training is less practical as a primary method but can be incorporated as a specialization.

Slow Lowering on Compound Lifts

The simplest and most universally applicable approach: slow down the lowering phase on your main lifts. This requires no additional equipment, no spotter, and no programming complexity — just deliberate intention on every rep.

For squats: 3 seconds from standing to depth. For bench press: 3 seconds from lockout to chest. For deadlift: 3 seconds from lockout to floor.

This dramatically increases the eccentric volume in a typical training session and is applicable to any training goal — whether strength, hypertrophy, or rehabilitation.

Eccentric Training for Injury Prevention and Rehabilitation

The most clinically well-supported application of eccentric training is in tendinopathy rehabilitation, as discussed in the tendon health article. The Alfredson protocol for Achilles tendinopathy (heavy slow eccentric calf raises) produced remarkable results in early research and established the paradigm of eccentric loading as a tendon remodeling stimulus.

The principle extends to other tendons: eccentric hamstring training (Nordic curls) has strong evidence for preventing hamstring strains in football players. A 2016 systematic review by Al Attar et al. in the *British Journal of Sports Medicine* found that the Nordic curl program reduced hamstring injury rates by approximately 51% across studies — one of the strongest injury prevention effects in the literature.

For patellar tendinopathy, eccentric decline squats are the most studied intervention. For lateral epicondylalgia (tennis elbow), eccentric wrist extension work is supported by multiple trials.

The injury prevention value of eccentric training for healthy athletes: by regularly loading the muscle-tendon unit eccentrically, the connective tissue adapts to these forces and becomes more resilient to the sudden eccentric loading that characterizes many sports injuries (hamstring strain during sprinting, calf strain during jumping).

Common Mistakes

Dropping the weight on the eccentric: Losing control of the lowering phase negates the eccentric stimulus and creates injury risk. The eccentric is where you're doing the work — it deserves as much intention as the concentric.

Using too much tempo too soon: Dramatically slowing the eccentric at high loads significantly increases time under tension and muscle damage. This can be productive when accumulated gradually but causes excessive soreness when introduced rapidly. Start with a 2-second eccentric and progress to 3–4 seconds over several weeks.

Neglecting eccentric in warm-up sets: Warm-up sets are often performed quickly, losing the eccentric stimulus and the injury-prevention benefits of eccentric-loaded tissue preparation. Even at 60% of your working weight, a controlled eccentric in warm-up sets prepares the tendon for the eccentrics at working weight.

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*This article is for informational purposes only.*