Medicine and Health Sciences Commons^™

Eccentric Loading Of Triceps Surae Modulates Stretch Shortening Cycle Behaviour - A Possible Therapeutic Mechanism, J Debenham, W Gibson, M Travers, A Campbell, G Allison

Physiotherapy Papers and Journal Articles

Context: Eccentric exercises are increasingly being used to treat lower limb musculoskeletal conditions such as Achilles tendinopathy. Despite widespread clinical application and documented efficacy, mechanisms underpinning clinical benefit remain unclear. Positive adaptations in motor performance are one potential mechanism.

Objective: To investigate how an eccentric loading intervention influences measures of stretch-shortening cycle (SSC) behaviour during a hopping task.

Design: Within subjects repeated measures observational study.

Setting: University motion analysis laboratory.

Participants: Healthy adults. Interventions: A single intervention of 5 sets of 10 eccentric plantarflexion contractions at 6 RM using a commercial seated calf raise machine.

Main outcome measures: Lower limb …

Achilles Tendinopathy Alters Stretch Shortening Cycle Behaviour During A Sub-Maximal Hopping Task, James R. Debenham, Mervyn J. Travers, William Gibson, Amity Campbell, Garry T. Allison

Physiotherapy Papers and Journal Articles

Objectives

To describe stretch shortening cycle behaviour of the ankle and lower limb in patients with Achilles tendinopathy (AT) and establish differences with healthy volunteers.

Design

Between-subjects case-controlled.

Methods

Fifteen patients with AT (mean age 41.2 ± 12.7 years) and 11 healthy volunteers (CON) (mean age 23.2 ± 6.7 years) performed sub-maximal single-limb hopping on a custom built sledge-jump system. Using 3D motion analysis and surface EMG, temporal kinematic (lower limb stiffness, ankle angle at 80 ms pre-contact, ankle angle at contact, peak ankle angle, ankle stretch amplitude) and EMG measures (onset, offset and peak times relative to contact) were …