Key Takeaways
- Isometric holds are a useful first step for an irritable tendon, letting it take real load without flaring, but they do not fix tendon pain on their own
- The study that made them popular found a 6.8-point drop in patellar tendon pain, in a sample of six volleyball players
- A 2020 meta-analysis of ten studies found isometrics no better than isotonic exercise for chronic tendon pain, immediately or over 12 weeks
- In 91 patients with Achilles tendinopathy, isometric holds gave no immediate pain relief compared with isotonic exercise or rest
- The 2024 JOSPT Achilles guideline makes loading as heavy as tolerated, at least three times a week, the first-line treatment
Isometrics for tendon pain work best as a starting point. They let an irritable tendon take meaningful load without moving through a painful range, so heavier strengthening can follow. They are not a cure, and the instant pain relief they became famous for has not held up consistently in larger studies. What resolves tendon pain is progressive loading, first heavy and then fast, because a tendon adapts to the load it is asked to carry. Holding positions alone never asks enough of it. At True Sports we use isometric holds to open a loading program in running rehab and in Achilles and heel pain cases. This article covers what the research shows, what isometrics actually do, how to program them for each tendon, and what comes next.
Do Isometrics Relieve Tendon Pain?
Sometimes, and less reliably than their reputation suggests. A 2015 study of six volleyball players found isometric holds cut patellar tendon pain by 6.8 points out of 10, with relief lasting at least 45 minutes. Larger studies since have found smaller or no immediate effects, so isometrics are best treated as one way to calm a painful tendon.
The original patellar tendon study, published in BJSM, compared isometric and isotonic quadriceps work. Isometrics dropped pain on a single-leg decline squat from 7.0 to 0.17, against 6.33 to 3.75 for isotonic work. Strength also rose rather than fell after the holds.
The follow-up research is less striking. A 2020 Achilles trial of 91 patients found no significant change in pain on a 10-hop test after isometric holds, isotonic exercise or rest, and no difference between them. Response varies by athlete, so the practical test is simple. Hold, then retest the painful movement, and keep the hold if the movement eases.
What Do Isometrics Actually Do for a Tendon?
They load the tendon without movement, which lets an irritable tendon tolerate real force. That makes them a bridge into strengthening rather than a separate treatment. A 2020 meta-analysis found isometric exercise no better than isotonic exercise for chronic tendon pain, immediately or over 12 weeks, so the value is tolerance, not a special healing effect.
That meta-analysis of ten studies, in BMJ Open Sport and Exercise Medicine, covered patellar, rotator cuff, elbow, Achilles and gluteal tendons. Its authors noted that the large pain reductions from the six-player study had not been replicated.
Not every isometric is the same. Dr. Justin Farnsworth, DPT, founder of Rebuilt Strength in Rochester, New York, separated the two kinds on the True Sports Podcast:
So you got two types of isos, right? You've got yielding isos. I'm gonna lose my position. That's great for tendon loading.
A yielding isometric holds a position against a load that is trying to move you, such as a wall sit with weight. The other kind, an overcoming isometric, is an all-out push against something that will not move. He uses that one to prime fast work, not to treat a tendon.
How Do You Program Isometrics for Tendon Pain?
Most protocols use five holds of about 40 to 45 seconds with two minutes of rest, at a load that is heavy but tolerable. Pain during the hold should stay at or below 5 out of 10 and settle by the next morning. Because the load stays fixed, holds can run daily, including before practice in season.
The position decides which tendon is loaded:
- Patellar tendon: a weighted wall sit or Spanish squat at a tolerable knee angle
- Achilles tendon: a calf raise held at mid-range, done with the knee bent and then straight
- Rotator cuff: an external rotation hold against a band or wall
- Proximal hamstring tendon: a bridge or hamstring hold with the hip kept out of deep flexion
- Gluteal tendon: hip abduction holds that keep the leg from crossing the midline
The hamstring and gluteal positions avoid compressing the tendon against bone, which aggravates both. The same principle applies to shoulder tendinopathy, where positions that pinch the cuff are held back until strength improves.
What Comes After Isometrics in Tendon Rehab?
Heavy, slow strengthening, then energy-storage work. The 2024 JOSPT Achilles guideline recommends tendon loading as heavy as tolerated, at least three times a week, as first-line treatment. Isometrics open that program and do not replace it. A tendon that only ever holds positions is not ready to sprint, jump or cut.
The JOSPT guideline, published in November 2024, gives tendon loading its strongest grade and limits it only for tendons with presumed structural frailty. The progression runs in stages:
- Isometric holds until the painful movement tolerates load
- Heavy slow resistance, three to four sets of 6 to 15 slow reps
- Energy-storage work such as pogo hops, skipping and bounding
- Sport-specific loading at game speed and volume
An athlete moves on when strength is within 10% of the other side and the pain stays inside the 5 out of 10 rule. Each stage can take weeks, and moving on early is the most common reason a tendon flares again. When a tendon cannot yet tolerate heavy weights, blood flow rehab builds strength at light loads in the meantime.
Nutrition That Supports a Tendon Loading Program
Tendon tissue adapts slowly, so nutrition supports the loading rather than speeding it up. Collagen at 5 to 10g with vitamin C, taken around an hour before an isometric or heavy loading session, is worth considering. The idea is to have collagen building blocks available while the tendon is under load, and vitamin C is required for the body to form new collagen.
Protein at 1.6 to 2.2g per kilogram of body weight daily, spread across meals of 20 to 40g, supports the muscle strength that protects a tendon. Many tendon problems in athletes follow a jump in training volume, and the muscle around the tendon has to grow to absorb that load. An athlete who loads hard but under-eats protein limits the strength gains the program depends on. Creatine monohydrate at 5g daily is a reasonable addition for athletes in the heavy strengthening stage, because it supports the training volume that stage demands.
Bottom Line
- Isometric holds help an irritable tendon tolerate load, but a 2020 meta-analysis found them no better than isotonic exercise for tendon pain
- The 6.8-point pain drop that made isometrics popular came from six volleyball players and has not been replicated in larger studies
- Tendon loading as heavy as tolerated, at least three times a week, is the first-line treatment, and isometrics are the way into it
Frequently Asked Questions
Do isometrics help tendinopathy? They help an irritable tendon tolerate load and can reduce pain for some athletes. Research shows they are no better than isotonic exercise overall, so they work best as the first stage of a progressive loading program.
How long should you hold an isometric for tendon pain? Most protocols use holds of about 40 to 45 seconds, repeated five times with two minutes of rest. The load should feel heavy, with pain during the hold staying at or below 5 out of 10.
Can you do isometrics every day? Yes. Because the load stays fixed and the tendon does not move through a painful range, most athletes tolerate daily holds, including before practice. Heavy strengthening sessions still need rest days between them.
Are isometrics enough to fix tendon pain? No. Tendons need progressive, heavier loading and then fast, springy work before an athlete returns to sprinting or jumping. Isometrics are the entry point to that program, not the whole of it.
Conclusion
Isometrics for tendon pain earn their place as a starting point. They let an irritable tendon accept load, and some athletes get real short-term relief, but the research does not support them as a treatment on their own. The work that resolves tendon pain is progressive loading, heavy and then fast, done at least three times a week. We move athletes through those stages on measured strength and pain response, not on a calendar. The same measures decide when a tendon is ready for sprinting, jumping and cutting again. If a sore tendon has stopped improving on holds alone, book your evaluation.
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