WWH is a wearable gravity-compensating HKA exoskeleton
developed to assist the locomotion activities of disabled and
elderly people [50]. The assistive torques provided by WWH are
proportional to the torques calculated based on an approximated
human body model, accounting user’s postures and motions.
Experiments with a subject standing up and sitting down showed a
reduction of EMG activities at the rectus femoris, thus proving the
WWHefficacy as an antigravity exoskeleton. In [51], pace changing
and climbing/descending stair experiments were implemented
with the same assistive strategy: heart rates were recorded
and showed a reduction when the subject’s movements were
supported by WWH.