Fig 1.
Ultrasonographic (longitudinal) image for measuring muscle thickness, pennation angle and fascicle length in vastus lateralis.
Fig 2.
Running velocity, force and power as a function of running time in a typical sprinter.
Running velocity (black line); modelled running velocity (red line); force (green line) and power (blue line).
Table 1.
Architectural characteristics of the analysed muscles.
Data are means ± SD. For plantar flexor (PF) and knee extensor (KE) muscles, thickness is the sum of all muscles, while pennation angle and absolute/relative fascicle length are the average of all muscles.
Table 2.
Correlation coefficients (R) and P values (in brackets) between muscle-tendon parameters and running variables for the investigated muscles and for the Achilles tendon.
Fig 3.
Running velocity as a function of the Achilles tendon cross sectional area (CSA).
Mean (full circles) and peak (open circles) running velocity.