Energy return from the achilles and calf muscles in those with intermittent claudication

NewsBot · May 4, 2016

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Gastrocnemius muscle architecture and achilles tendon properties influence walking distance in claudicants with peripheral arterial disease
Stephanie Louise King et al
Muscle & Nerve; Volume 53, Issue 5, pages 733?741, May 2016

Introduction
The extent to which gastrocnemius muscle and Achilles tendon properties contribute to the impaired walking endurance of claudicants is not known.

Methods
Ultrasound images quantified muscle architecture of the lateral and medial gastrocnemius (GL and GM) and were combined with dynamometry during plantarflexor contractions to calculate tendon stress, strain, stiffness, the Young modulus, and hysteresis. Key parameters were entered into multiple regression models to explain walking endurance.

Results
Worse disease severity was significantly associated with longer fascicle: tendon length ratios (GL R = -0.789 and GM R = -0.828) and increased tendon hysteresis (R = -0.740). Walking endurance could be explained by GL and GM pennation angle, maximum tendon force, tendon hysteresis, and disease severity (R2 = ∼0.6).

Conclusions
Peripheral arterial disease was associated with functionally important changes in muscle and tendon properties, including the usage of stored elastic energy. Interventions known to target these characteristics should be adopted as a means to improve walking endurance. Muscle Nerve 53: 733?741, 2016
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Admin2 · May 4, 2016

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