Parallel-limb exoskeletons have also been advanced to
augment the load-carrying capacity of humans [17-32].
This type of leg exoskeleton could benefit people who
engage in load carrying by increasing load capacity, lessening
the likelihood of leg or back injury, improving metabolic
locomotory economy, and/or reducing the
perceived level of difficulty. One such exoskeletal design
is shown in Figure 2c, or the Berkeley Lower Extremity
Exoskeleton (BLEEX) developed by Professor Kazerooni.
One of the distinguishing features of this exoskeleton is
that it is energetically autonomous, or carries its own
power source. Indeed, its developers claim it as the first
"load-bearing and energetically autonomous" exoskeleton
[17].