Article

Studies of the maximal oxygen uptake (VO(2max)) of transfemoral
amputees have mostly used protocols that activate a relatively small muscle mass.
Consequently, transfemoral amputee VO(2max) may be systematically underestimated,
and the validity of these test protocols is questionable. OBJECTIVES: (1)
Investigate validity and reliability of a VO(2max) walking protocol and (2)
compare the VO(2max) of a transfemoral amputee group with a group of matching
controls. STUDY DESIGN: (1) Randomized crossover study: walking versus running
VO(2max) for the control group and (2) case-control study: transfemoral amputees
versus control group VO(2max). METHODS: Twelve transfemoral amputees and control
participants performed a walking VO(2max) test with increasing treadmill
inclinations to voluntary exhaustion. The control group also completed a running
("gold-standard") VO(2max) test. RESULTS: Mean (standard deviation) control group
VO(2max) following walking and running was similar, that is, 2.99 (0.6) L min(-1)
and 3.09 (0.7) L min(-1), respectively. Mean (standard deviation) transfemoral
amputee walking VO(2max) was 2.14 (0.8) L min(-1) (compared to CON; p < 0.01).
Mean intraclass correlation coefficient of repeated VO(2) measurements was 0.97,
and within-subjects standard deviation was 60 mL min(-1). CONCLUSIONS: The walk
protocol is valid. Walking VO(2max) of transfemoral amputees was 40% lower
compared to control group. Reliability of the walking protocol is comparable to
other walking protocols. Clinical relevance The design, alignment, and materials
of prostheses are important for effective ambulation. Cardio-respiratory fitness
is, however, also important in this regard, and a low fitness may compromise
health and independent living. Hence, transfemoral amputees with low physical
fitness should engage in regular physical activity to improve health, gait
capacity, and independency.

Langue : ANGLAIS