Energy consumption during prosthetic walking and physical fitness in older hip disarticulation amputees Takaaki Chin, MD; Ryosuke Kuroda, MD; Toshihiro Akisue, MD; Tetsuhiro Iguchi, MD; Masahiro Kurosaka, MD
Aim • Investigate energy consumption during prosthetic walking and physical fitness in older hip disarticulation (HD) subjects. • Relevance • Increased energy consumption during prosthetic walking with high amputation is extreme and unavoidable. • Older HD subjects usually have difficulties recovering from a deconditioned state and maintaining physical fitness required to walk with a prosthesis.
Method • Subjects: 7 unilateral HD amputees (average age 68). • Portable telemetric system was used to measure energy consumption during prosthetic walking at each individual’s comfortable walking speed (CWS). • Incremental exercise test was performed to evaluate fitness.
Results • Average CWS: 30.5 ± 9.6 m/min. • Average O2 consumption rate: 18.3 ± 2.4 mL/kg/min. • Average O2 cost: 0.639 ± 0.165 mL/kg/m. • Maximum O2 uptake as proportion of predicted maximum O2 uptake (%VO2max): 57.2 ± 11.1. • Community outcomes: • 5 subjects continued prosthetic walking. • %VO2max : 55.8 to 72.0. • 2 subjects abandoned prosthetic walking. • Lower %VO2max of 43.3 and 44.2.
Conclusion • Energy consumption during prosthetic walking at CWS seemed not to be excessive. • Older HD amputees in good physical condition successfully walked with prosthesis in community setting. • Lower level of fitness appears to make community walking prohibitive.