03/23/2026
Looking at this result caused by minor re-injurys... with a "4 years later" time-gap in-between for the inflammation to fester. These knots or "lactic acid buildup" will effect the surrounding muscle groups that pull around the tension spot in a dysfunctional way, instead of this muscle group just contracting & generating force in unison.
An emphatic response tends to follow pain relief and lets you-as a therpist- know you're on the right track. Overall client will benefit tremendously when you consider their actual trouble spots.
๐๐ต๐ฟ๐ผ๐ป๐ถ๐ฐ ๐๐ต๐ฎ๐ป๐ด๐ฒ๐ ๐๐ณ๐๐ฒ๐ฟ ๐ฎ ๐๐ฎ๐น๐ณ ๐ ๐๐๐ฐ๐น๐ฒ ๐ฆ๐๐ฟ๐ฎ๐ถ๐ป: ๐ ๐๐ฒ๐ฒ๐ฝ ๐๐ถ๐๐ฒ ๐ถ๐ป๐๐ผ ๐ ๐๐๐ฐ๐น๐ฒ ๐๐ฟ๐ฐ๐ต๐ถ๐๐ฒ๐ฐ๐๐๐ฟ๐ฒ ๐ฎ๐ป๐ฑ ๐๐ผ๐ป๐ป๐ฒ๐ฐ๐๐ถ๐๐ฒ ๐ง๐ถ๐๐๐๐ฒ
โฌ Calf muscle strain injuries are incredibly common in sports that involve sudden acceleration and high-speed running, and unfortunately, they are notoriously associated with a high reinjury rate.
โฌ These injuries almost exclusively occur at the delicate interface between the muscle and the aponeurosis, the sheet-like tendinous connective tissue.
โฌ Despite their high prevalence, the long-term structural and functional consequences of gastrocnemius calf strains have received very little attention.
โฌ A 2023 study published in the Scandinavian Journal of Medicine & Science in Sports, titled "Chronic changes in muscle architecture and aponeurosis structure following calf muscle strain injuries," aimed to uncover exactly how the muscle and aponeurosis adaptโor fail to adaptโlong after the initial injury.
โฌ Here is a thorough breakdown of the study's methods, key findings, and implications.
๐ช๐ต๐ฎ๐ ๐๐ถ๐ฑ ๐๐ต๐ฒ ๐ฅ๐ฒ๐๐ฒ๐ฎ๐ฟ๐ฐ๐ต๐ฒ๐ฟ๐ ๐๐ผ?
โฌ The researchers investigated the structural and functional differences between the injured and uninjured calves of 10 participants who had previously suffered a chronic strain in the medial head of the gastrocnemius GM muscle.
โฌ On average, these individuals were 47 months past their initial injury onset.
โฌ Using advanced dynamic and static ultrasound imaging, the researchers measured muscle fascicle length, pennation angle, the angle at which muscle fibers attach to the connective tissue, and the thickness of the deep aponeurosis.
โฌ Measurements were taken at rest in various ankle positions and dynamically while participants performed a unilateral heel-rise exercise.
โฌ Additionally, electromyography EMG was used to assess the neuromuscular activation of the GM and the soleus muscles during the heel rise.
๐๐ฒ๐ ๐๐ถ๐ป๐ฑ๐ถ๐ป๐ด๐
โฌ The study revealed striking, long-lasting differences between the previously injured calves and the healthy counterparts.
Muscle Fascicle Changes ๐งฌ
โฌ Fascicles are shorter and inactive.
โฌ The muscle fascicles in the most distal portion of the injured GM were significantly shorter than those in the uninjured leg.
โฌ Ultrasound videos showed that the distal fascicles on the injured side rolled inward and took on a pronounced curvilinear shape during muscle contraction, rather than pulling taut.
โฌ The researchers hypothesize that these curved fascicles are essentially inactive and are simply being pulled by the aponeurosis instead of actively contracting and generating force.
Pennation Angle Changes ๐
โฌ While resting pennation angles were similar between sides, the pennation angle of the injured distal GM became significantly steeper during contraction compared to the healthy calf.
Connective Tissue Adaptations ๐งต
โฌ The aponeurosis was significantly enlarged thickened in the injured calf compared to the healthy calf, both at rest and during muscle contraction.
โฌ On the healthy side, parts of the aponeurosis naturally thinned during contraction as it stretched.
โฌ The injured aponeurosis actually thickened further during contraction.
โฌ This indicates substantial and long-lasting involvement of the connective tissue during the repair process.
Altered Muscle Activation ๐ง
โฌ EMG data revealed that the neuromuscular activation pattern was changed.
โฌ The injured calf displayed significantly higher relative soleus muscle activity compared to the GM during the heel rise.
โฌ This suggests a compensatory or protective strategy where the body relies more heavily on the soleus to perform the movement.
โฌ This may occur due to reduced motor unit recruitment in the injured GM.
๐ช๐ต๐ ๐๐ผ๐ฒ๐ ๐ง๐ต๐ถ๐ ๐ ๐ฎ๐๐๐ฒ๐ฟ?
โฌ The results of this study suggest that a calf muscle strain causes long-term, and likely permanent, changes to both the muscle architecture and the neuromuscular system.
โฌ If the muscle fascicles at the distal GM do not actively contract during voluntary movement, the muscle and the aponeurosis are deprived of the essential mechanical tension needed to maintain their strength.
โฌ The researchers propose that this failure to restore a firm, functional connection between the muscle and the connective tissue could be a key reason why calf strains have such a high rate of reinjury.
โฌ These findings encourage a rethinking of current rehabilitation protocols.
โฌ In hamstring injuries, eccentric exercises have been proven to increase fascicle length and reduce reinjury risk.
โฌ However, it is still unknown whether targeted eccentric training for the calf could help lengthen these distal fascicles and restore functional muscle contraction to the injured area.
