Force-velocity multiplier

Normalised Hill force-velocity relation. Velocity is normalised fiber velocity with negative = shortening (concentric), positive = lengthening (eccentric).

Usage

forceVelocity(norm_vel, af = 0.25, f_ecc = 1.8, k_ecc = 0.15)

Arguments

norm_vel

Normalised fiber velocity (concentric < 0).

af

Hill shape parameter for shortening (default 0.25).

f_ecc

Eccentric force asymptote (default 1.8).

k_ecc

Eccentric saturation constant (default 0.15).

Value

Multiplier (0 at max shortening, 1 at isometric, up to f_ecc).

Examples

forceVelocity(c(-0.5, 0, 0.5))
#> [1] 0.1666667 1.0000000 1.6153846