Beyond the eccentric exercise

I am wary of rehabilitation arguments organised around a favourite contraction type. Eccentric exercise, isometric holds and heavy slow resistance are often presented as competing solutions. A more useful question is what capacity a person needs to regain, and whether the programme progressively exposes them to it. That question leaves room for several methods without pretending that all methods are interchangeable.

What the research supports

A randomised trial by Breda and colleagues compared progressive tendon-loading exercise therapy with eccentric exercise therapy in people with patellar tendinopathy. At 24 weeks, the progressive programme produced a greater improvement in the primary pain-and-function outcome, the VISA-P score. The study supports that particular programme in that population; it does not establish one universal protocol for every painful tendon.

The distinction matters. Patellar and Achilles tendons face different tasks, and insertional symptoms can require different considerations from mid-portion symptoms. A result in established patellar tendinopathy cannot simply be transferred to an acute rupture, postoperative repair or undiagnosed pain. My interpretation is that progression deserves more attention than exercise branding—not that diagnosis has become optional.

Isometrics: useful, not compulsory magic

Rio and colleagues reported immediate pain relief after isometric exercise in a small study of athletes with patellar tendinopathy. That finding helped popularise sustained holds. However, an immediate response is not proof of long-term recovery, and a small study cannot establish that everyone will experience the same analgesic effect.

Isometrics can provide a controllable way to produce force with little joint movement. Their practical limitation is equally clear: holding a position does not reproduce repeated accelerations, landings or rapid stretch-shortening actions. I would treat symptom relief as potentially useful information, not as evidence that the tendon is ready for a competitive workload.

Resistance work and the missing bridge

Progressive resistance allows load, range, tempo and volume to be adjusted separately. Machines can simplify execution and measurement; free weights may be more accessible but introduce additional balance and technique demands. Neither choice is inherently more evidence-based. Equipment availability, exercise tolerance and the ability to document progression are meaningful trade-offs.

Sport also asks tendons to store and release energy rapidly. Slower strength work does not fully represent that demand. Jumping, hopping and running exposures therefore belong in the discussion of later rehabilitation, when appropriate to the diagnosis and the treating professional’s assessment. The bridge is a change in loading characteristics, not merely another week of the same exercise.

Pain is a signal, not a complete dashboard

A pain rating can help describe the response to an exposure, especially when compared with the following morning and the person’s usual baseline. It cannot directly measure tissue capacity. Low pain may coexist with substantial weakness; persistent pain does not automatically demonstrate fresh structural damage. Both errors can distort decisions.

Some rehabilitation studies permit symptoms within specified limits. Those limits belong to a monitored protocol and should not be repackaged as a universal permission slip. I would want reporting to include symptom behaviour, functional performance and completed training, rather than reducing progress to a single number collected during exercise.

What I would ask of a programme

A credible programme should explain its target: restoring force, increasing tolerated volume, introducing faster loading or rehearsing sport demands. It should also explain how progress is judged and what prompts reassessment. Without those details, “progressive loading” can become a reassuring label attached to an unchanged routine.

The practical attraction of loading-based rehabilitation is that it can often use ordinary gym equipment rather than proprietary technology. Its cost is sustained time, supervision where needed and access to suitable progression. This is not a personal exercise prescription. New severe pain, a sudden loss of function or concern about rupture warrants clinical assessment rather than experimentation with an online loading ladder.