Table 2.

Ontology definitions and detailed description of the activity labels found in the dataset.

Label	Ontology Definition	Description
Ambulation
a_ascend	ascending stairs	Ascending stairs
a_descend	descending stairs	Descending stairs
a_jump	jumping	A standing vertical jump
a_walk	walking	Walking without objects in one’s hands
a_loadwalk	Walking with load	walking whilst holding objects (e.g. a bowl).
Posture
p_bent	bend over	Static stand with the torso bent forward at any angle.
p_kneel	kneeling	Crouching with knees bent, resting on the knees.
p_lie	lying	Lying down in any position (e.g. supine, prone)
p_sit	sitting on chair/bed/sofa	Any seated posture other than those defined elsewhere.
p_squat	squating	Crouching with knees bent and balancing on the feet
p_stand	standing	Any standing posture.
Transition
t_bend	bending	Bending the torso forward, defined to include partial rotation.
t_straighten	straightening	Straightening the torso.
t_turn	turning/pivoting	A turn or pivot of the torso, defined to include partial rotation.
t_stand_kneel	stand to kneel	Transition from a standing position to a kneeling position.
t_kneel_stand	kneel to stand	Transition from a kneeling position to a standing position.
t_lie_sit	lying to sit	Transition from lying down (typically in a supine position) to a standing position
t_sit_lie	sit to lying	Transition from a seated position to lying down.
t_sit_stand	sit to stand	Transition from a seated position to a standing position.
t_stand_sit	stand to sit	Transition from a standing position to a seated position.