Development and Evaluation of a Powered Artificial Gastrocnemius for Transtibial Amputee Gait

Table 5

Metabolic cost of transport using the artificial gastrocnemius. Values given represent the net metabolic power, above that of basal metabolic rate. Positive values for percent change indicate that the participant required less metabolic power with the neuromuscular controller, compared to the control condition of zero-torque at the knee. Theoretical metabolic reduction, based on the change in knee orthosis and ankle-foot prosthesis applied average power from the ZERO condition to the OPT condition, and assuming 25% muscle efficiency, is also shown for comparison.

	S1	S2	S3	S4	S5	S6
ZERO Condition Net Metabolic Power (W/kg)	2.95	3.51	3.60	5.06	3.34	3.52
OPT Condition Net Metabolic Power (W/kg)	3.13	3.08	3.87	4.95	2.97	3.38
Percent change in metabolic power from ZERO condition to OPT condition	5.8		7.4
Theoretical percent change in metabolic power