There is provided a contact force determination method comprising obtaining, at a computing device, at least one physiological signal indicative of at least one physiological parameter of a user, the at least one physiological signal obtained from at least one contact-based physiological sensor embedded in a wearable device secured to a body part of the user; determining, at the computing device, one or more statistical parameters of the at least one physiological signal; determining at the computing device, based on the one or more statistical parameters, a contact force between the wearable device and the body part; and outputting, at the computing device, the contact force as determined.