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Fig. 5. The average Achilles tendon (AT) length change measured directly using the
projected MTJ measurement and the corresponding estimates of series elastic
element (SEE) length change during walking (A) and running (B) for downhill
(-10%; blue), level (0%; green) and uphill (10%; red) conditions. The AT slack
length is estimated from the average length of AT during walking on the level
at the average time of toe-off. The estimated aponeurosis length change (which
includes the proximal GM tendon) is calculated as the difference between the
AT length change (relative to the slack length) and the SEE length change. The
shaded areas mark the average stance time across each condition.