Achilles Tendinopathy in Runners: What It Is and How Physical Therapy Helps
Achilles pain is one of the most common reasons runners end up sidelined, and it is also one of the most mismanaged. Rest helps for a few days. You head back out. The stiffness returns on the first mile. The cycle frustrates most runners into either pushing through pain or stopping altogether. Neither approach actually works.
At Victory Performance and Physical Therapy in Mar Vista, we see Achilles tendinopathy often in local runners, and the treatment approach that actually gets lasting results looks very different from simply resting and stretching.
What Is Achilles Tendinopathy?
The Achilles tendon connects your calf muscles to your heel bone. It is the thickest and strongest tendon in your body, and it handles enormous loads during running. Every time your foot strikes the ground, your Achilles absorbs and releases energy at a rate that can reach several times your body weight.
Achilles tendinopathy (ten-din-OP-uh-thee) is a condition involving pain, stiffness, and reduced function in the tendon. It is not the same as a rupture. In tendinopathy, the tendon structure has become disorganized at a cellular level due to repeated overload without adequate recovery. The fibers that normally run in parallel start to break down, collagen quality drops, and the tendon loses some of its capacity to handle load.
There are two primary locations where Achilles tendinopathy shows up in runners:
Mid-portion tendinopathy appears two to six centimeters above the heel bone. This is the most common form in runners and responds very well to physical therapy.
Insertional tendinopathy occurs where the tendon attaches to the heel bone. This type is more complex and requires a slightly different treatment approach.
Why Achilles Tendinopathy Is Not Just a Tightness Problem
Most runners assume Achilles pain means the calf is too tight. They stretch it. They massage it. They apply ice and rest. These strategies can manage symptoms temporarily, but they often make the underlying problem worse over time, particularly passive stretching, which can irritate an already compromised tendon insertion.
The research tells a different story. The Achilles tendon does not respond to passive treatment. It responds to load. Gradual, progressive loading is what drives tendon remodeling, rebuilds collagen quality, and restores the tendon's capacity to handle the demands of running.
A foundational study by Alfredson and colleagues published in the American Journal of Sports Medicine demonstrated that a structured program of heavy-load eccentric calf training produced significant improvements in chronic Achilles tendinopathy in runners who had been symptomatic for an average of over a year. (Alfredson et al., 1998, Am J Sports Med. View on PubMed)
This study helped shift how the entire physical therapy and sports medicine field approaches tendon rehabilitation.
What Makes Achilles Tendinopathy Worse
Knowing what aggravates the tendon helps you manage load smarter during recovery. Common irritants include:
Rapid increases in training volume or intensity. The Achilles adapts more slowly than your cardiovascular system. Your lungs might be ready for more mileage before your tendon is.
Too much hill work. Uphill running increases Achilles loading significantly. Downhill running, while easier on the calf, changes the tendon mechanics in ways that can also cause irritation.
Changing footwear suddenly. Moving from a cushioned shoe with heel drop to a minimal shoe dramatically increases Achilles demand. That transition needs to be gradual.
Running on hard surfaces without adequate variation. Concrete and asphalt are unforgiving on tendons. Mixing in softer surfaces like the grass sections of Kenneth Hahn State Recreation Area can reduce cumulative loading during recovery.
Too much passive stretching. For insertional tendinopathy especially, aggressive calf stretching into dorsiflexion (pulling the toe up) compresses the tendon at its attachment point and can worsen symptoms.
How Physical Therapy Treats Achilles Tendinopathy
Physical therapy for Achilles tendinopathy is built around progressive tendon loading. The goal is to guide the tendon through a rehabilitation process that systematically increases its capacity to absorb and generate force.
Phase 1: Isometric Loading
Isometric exercises involve holding a contraction without movement. These are used early in rehabilitation because they can reduce tendon pain quickly while maintaining some load through the tissue. A common example is a sustained calf raise hold on a step.
This phase does not build much tendon capacity, but it reduces sensitivity and helps you stay active during the early weeks.
Phase 2: Isotonic Loading (Eccentric and Heavy Slow Resistance)
This is the core of Achilles rehab. Eccentric loading, particularly slow heel drops off a step, has decades of research supporting its effectiveness.
A randomized controlled trial published in the American Journal of Sports Medicine compared eccentric training to heavy slow resistance training for Achilles tendinopathy and found both approaches produced significant and comparable improvements in pain and function. (Beyer et al., 2015, Am J Sports Med. View on PubMed)
The key with both approaches is that the load must be heavy enough to stimulate tendon adaptation. Lightweight, high-rep calf raises do not generate enough stress to drive meaningful change. Your physical therapist will help you calibrate the right resistance.
Phase 3: Energy Storage and Return
Tendons are like springs. They store energy and release it. Running demands this capacity. Phase three introduces plyometric loading, double-leg hopping, then single-leg work, and finally running-specific drills that challenge the tendon's ability to function under dynamic load.
This phase is where most runners become tempted to rush. The tendon may feel good, but it takes time to rebuild the structural quality that supports sustained running. Returning to full training too quickly is the most common reason Achilles tendinopathy recurs.
Shockwave Therapy as an Additional Option
For cases that have been present for several months or are not progressing at the expected rate, Victory offers shockwave therapy, a non-invasive treatment that delivers acoustic energy to the tendon to stimulate healing and break up disorganized tissue. Shockwave can be a useful adjunct to loading-based rehabilitation for chronic tendinopathy.
Dealing with Achilles stiffness or pain that is limiting your training? Our Mar Vista team can assess your tendon health and build a structured loading program around your specific situation.
Call today: 424-543-4336
Understanding the Tendon Continuum
Researcher Jill Cook published a model in the British Journal of Sports Medicine that explains tendinopathy as a continuum, ranging from reactive tendinopathy (an acute overload response) to tendon disrepair (structural breakdown) to degenerative tendinopathy (significant tissue loss). (Cook and Purdam, 2009, Br J Sports Med. View on PubMed)
This model matters because treatment needs to match the stage. A runner in the early reactive phase needs load management and relative rest. A runner with degenerative changes needs progressive loading to stimulate what remodeling is still possible.
Guessing where you are on that continuum without an evaluation leads to the wrong approach at the wrong time, which is why so many runners end up in the frustrating rest-return-hurt cycle.
What to Expect With Recovery
Achilles tendinopathy does not resolve in a few weeks. The tendon heals and adapts more slowly than muscle. A reasonable recovery timeline for mid-portion tendinopathy with consistent physical therapy is three to six months of progressive work before returning to full unrestricted running.
That sounds long, but the alternative is repeated cycles of partial recovery and re-injury that can extend into years.
Progress is typically measured by:
Reduced morning stiffness (one of the most consistent early markers of improvement)
Ability to complete loading exercises without increased pain or latent symptoms
Gradual return to running with appropriate load monitoring
The goal is not just to get you to the start line of your next race. It is to build a tendon that holds up through months of training and beyond.
A Runner Who Made It to Race Day
Will M. came to Victory Performance with a lingering calf and tendon injury while training for a marathon. He was not sure he would make it to the start line.
"CJ created a plan that not only addressed my pain but focused on long-term strength and mobility to improve my performance overall. The combination of expert manual therapy, thoughtful progressions, and genuine care made a huge difference in my recovery."
Will made it to race day strong and ready to run. That is what a systematic, load-based approach to tendon rehabilitation can produce.
People Also Ask About Achilles Tendinopathy
Should I stop running with Achilles tendinopathy?
Not necessarily. A physical therapist can help you identify a training volume that allows the tendon to continue adapting without being overloaded. Complete rest is often counterproductive because it reduces tendon loading and can actually slow recovery. Load modification is usually more effective than full rest.
Is massage good for Achilles tendinopathy?
Soft tissue work and massage can help reduce calf muscle tension and improve blood flow to the area, which supports recovery. It should be part of a broader rehabilitation plan, not the primary treatment.
How do I know if my Achilles is getting better?
A reliable marker is reduced morning stiffness after sleep. Tendons are characteristically stiff in the morning and loosen up as you move. As tendinopathy improves, that stiffness decreases. You should also be able to complete progressive loading exercises with less pain and no worsening of symptoms in the hours after.
Can I run the LA Marathon with Achilles tendinopathy?
This depends on the severity of the condition and how much runway you have before the race. With an appropriate rehabilitation program, load management, and the right guidance, many runners are able to train through Achilles issues and reach race day. An early evaluation gives you the best chance of making that happen safely.
Ready to Tackle Your Achilles Problem for Good
If Achilles pain keeps interrupting your training, the solution is a structured loading program, not more rest. Victory Performance and Physical Therapy in Mar Vista works with runners at every stage of tendon rehabilitation, from early reactive cases to chronic tendinopathy that has been hanging around for months.
If you are in Mar Vista, Culver City, or anywhere on the Westside of Los Angeles, schedule an evaluation and get a clear picture of where your tendon is and what it needs.
Book your evaluation today.
📞 Call: 424-543-4336