The first morning steps that reveal the problem

The pattern is unmistakable: on getting out of bed, the Achilles tendon is stiff and painful. The first steps are taken cautiously, almost limping. After a few minutes of walking, stiffness eases and pain decreases — the só-called "warm-up phenomenon." But if you walk longer or climb stairs, the pain returns. This morning pattern is the calling card of Achilles tendinopathy, a condition that affects not only athletes, but anyone who subjects the tendon to load beyond its recovery capacity.

What many patients and even professionals do not perceive is that pain in the tendon frequently has a significant muscular component: trigger points in the soleus and gastrocnemii generate excessive tension on the Achilles, reducing the tendon's capacity to absorb load. Electroacupuncture combined with calf dry needling addresses both the tendon and the musculature that tensions it \u2014 an integrated approach that conventional treatment frequently ignores.

How the tense calf sickens the tendon

  1. Soleus as a tension generator

    The soleus is the deepest muscle of the calf and the main force generator during walking. Trigger points in the soleus increase the basal tone of the muscle, generating excessive and constant traction on the Achilles tendon — even at rest. This chronic tension exceeds the tendon’s repair capacity and initiates the degenerative process.

  2. Gastrocnemii and biarticular load

    The gastrocnemii cross both the knee and the ankle. In people who spend a lot of time sitting, these muscles shorten and generate additional traction on the Achilles when the patient stands. Trigger points in the gastrocnemii refer pain to the calf and the posterior heel region.

  3. Reactive and degenerative tendinopathy

    The overloaded tendon goes through phases: first reactive tendinopathy (swelling, acute pain, potentially reversible), then tendinous disrepair, and finally degenerative tendinopathy (structural change with neovascularization and collagen disorganization). Early intervention with reduction of muscular tension can reverse the reactive phase.

  4. Warm-up phenomenon

    Morning stiffness occurs because the tendon shortens during the night in plantar flexion. The first steps suddenly stretch the tendon, generating pain. After minutes of walking, blood flow increases and the tendon temporarily adapts — the "warm-up." This temporary improvement frequently leads the patient to underestimate the severity.

  5. Cycle of overload-insufficient repair

    Each day of activity without adequate recovery deepens the tendinous injury. The tendon has limited vascularization in the midportion (the "watershed" zone), which makes healing slower than in well-perfused tissues. Electroacupuncture 2 Hz stimulates local angiogenesis, improving perfusion of this critical zone.

Clinical data on Achilles tendinopathy

6%
OF THE GENERAL POPULATION
develops Achilles tendinopathy at some point in life — it is one of the most prevalent tendinopathies
55%
OF PATIENTS
with Achilles tendinopathy have clinically significant trigger points in the soleus and gastrocnemii contributing to tension on the tendon
2 Hz
ELECTROACUPUNCTURE FREQUENCY
stimulates endorphin release and promotes local angiogenesis — mechanisms especially relevant for tendinous tissue with limited vascularization
75%
OF FUNCTIONAL IMPROVEMENT
in 8-12 weeks with a protocol that combines electroacupuncture, calf dry needling, and progressive eccentric exercises

Recognizing Achilles tendinopathy

Critérios clínicos
07 itens

Typical pattern of Achilles tendinopathy

  1. 01

    Stiffness and pain in the Achilles tendon in the first minutes after getting out of bed

  2. 02

    Pain that improves with warm-up and worsens after prolonged activity

  3. 03

    Palpable tendon thickening compared to the opposite side

  4. 04

    Pain on climbing stairs or standing on tiptoe

  5. 05

    Tense and tender calf on palpation on the same side

  6. 06

    Pain that appeared gradually, without specific trauma

  7. 07

    Worsening of pain after periods of sitting followed by walking

Myths and facts about Achilles tendon pain

Myth vs. Fact

MYTH

Achilles tendinopathy is an athlete’s problem — sedentary people do not develop it

FACT

Although more common in runners and athletes, Achilles tendinopathy also affects sedentary and overweight people. A sedentary lifestyle weakens the tendon and the calf musculature, making them vulnerable even to everyday loads such as walking and climbing stairs. A sudden increase in activity in deconditioned people is a classic trigger.

MYTH

Stretching the tendon before walking resolves morning stiffness

FACT

Aggressive static stretching of an irritated tendon can worsen the tendinopathy, especially in the reactive phase. The safest approach in the morning is to begin with light dorsiflexion and plantar flexion movements before getting out of bed, progressing slowly. Eccentric exercises — not passive stretching — are the gold standard for tendinous rehabilitation, performed in a progressive and controlled manner.

MYTH

Anti-inflammatories are the best treatment for tendinopathy

FACT

Chronic tendinopathy is not primarily an inflammatory process — it is degenerative. Anti-inflammatories may relieve pain temporarily, but do not treat tendinous degeneration and may even impair tissue repair with chronic use. Electroacupuncture and eccentric exercises act on the biological repair mechanisms of the tendon — stimulating collagen and neovascularization.

The tendon that seems to age before its time

Treatment protocol

Assessment and classification of the tendinopathy
1st visit

Clinical exam: location of pain (insertional vs. midportion), tendinous thickening, Thompson test (to rule out rupture). Myofascial exam of the soleus and gastrocnemii. Diagnostic ultrasound when available to assess neovascularization and thickening. Classification of the phase (reactive, disrepair, degenerative).

Calf dry needling and electroacupuncture
Sessions 1-4

Dry needling of the soleus (medial and lateral portions) and gastrocnemii with search for twitch response to reduce tension on the Achilles. Electroacupuncture 2 Hz at the tendon (midportion or insertional according to location) for analgesia and stimulation of tissue repair. Initiation of isometric exercises for tendinous analgesia.

Progressive eccentrics and neuromodulation
Sessions 5-8

Progression to eccentric exercises (adapted Alfredson protocol): heel raises on a step with slow lowering. Maintenance of electroacupuncture sessions to support tendinous repair. Maintenance dry needling of the calf as needed.

Return to activity and prevention
Sessions 9-12

Progressive increase of functional load (walking, stairs, light running). Biweekly maintenance sessions. Preventive program: eccentric and concentric strengthening of the calf 3x/week. Guidance on calculation and risk of overload with increased activity.

Clinical pearl: the morning test

Frequently asked questions

FREQUENTLY ASKED QUESTIONS · 04

Frequently Asked Questions

Achilles tendon rupture generally occurs in previously degenerated tendons subjected to sudden effort (jump, sprint). Untreated chronic tendinopathy increases the risk of rupture, but progression is not inevitable. Appropriate treatment — which includes electroacupuncture, eccentric exercises, and load management — strengthens the tendon and reduces this risk. Warning signs for rupture: audible pop, inability to stand on tiptoe, palpable depression in the tendon.

It depends on the phase and severity. In the acute reactive phase (intense pain, swelling), temporary suspension of running is recommended. In the stable chronic phase, running can be maintained with reduced volume and load adjustment, provided pain during and after running is tolerable (up to 3-4/10) and does not progressively worsen. The sports physician guides safe and individual progression.

Mild to moderate pain during eccentric exercises (up to 4-5/10) is acceptable and even expected in the first weeks. This pain is part of the tendinous remodeling stimulus. If pain exceeds 5/10 during exercise or if morning stiffness worsens the next day, the load should be reduced. Progress is gradual — increase the load only when pain during exercise consistently decreases.

Electroacupuncture with thin needles (0.25-0.30 mm) and low-frequency current (2 Hz) is safe for tendinous tissue. Studies show it stimulates collagen production and neovascularization, favoring repair. The medical acupuncturist adjusts the intensity according to the phase of the tendinopathy — gentler in the reactive phase, with potential to intensify in the chronic degenerative phase.