Clinical Trial Radar

Identification of oxygen cost of walking in children with lower limb amputation

Oxygen cost of walking (mL.kg-1.m-1): ratio of oxygen flow rate (mL.kg-1.s-1) and walking speed (m.s-1) during 6-minute walking test. Oxygen flow rate is computed as the difference in oxygen concentration between inhaled and exhaled air during a breath. It is measured per breath and averaged over a 6-minute walking test.

Day 1

Identification of gait parameters in children with lower limb amputation

Gait parameters are defined by : * deviation from a healthy pediatric norm available in the gait analysis software averaged over the entire gait cycle, calculated for the trunk, pelvis, hips, knees and ankles in each plane of space * deviation of center of gravity position relative to theorical position at constant speed. Spatiotemporal parameters include : speed, cadence, step length (on both sides) and stride width.

Day 1

Identification of the determinants of oxygen cost of walking among clinical parameters of the children with lower limb amputation

Oxygen cost of walking (mL.kg-1.m-1) : ratio of oxygen flow rate (mL.kg-1.s-1) and walking speed (m.s-1) during 6-minute walking test. Oxygen flow rate is computed as the difference in oxygen concentration between inhaled and exhaled air during a breath. It is measured per breath and averaged over a 6-minute walking test. Clinical parameters : age, sex, height, weight, level and age of amputation.

Day 1

Perceived effort of the procedure for measuring oxygen consumption during the walking test assessed by the modified Borg scale

Modified Borg Rating of perceived exertion scales: the minimum score is 6 meaning very, very light effort, the maximum score is 10 indicating the maximum exertion.

Day 1

Acceptability of the procedure for measuring the children's oxygen consumption when walking assessed by a self-questionnaire

This self-questionnaire designed for the study consists of 4 questions with 5 answers to assess the degree of acceptability. The questions are : * During the test, did you find the sensations associated with the MASK unpleasant? * Did you find the sensations associated with the DEVICE (COSMED) unpleasant? * Did you feel comfortable and well supported by the examiner during the test? * Would you be willing to take this test again if we offered it to you?

Day 1

Usefulness of informations provided by the energy expenditure measurement and gait analysis assessed by a self-questionnaire

This self-questionnaire named "Assessment of the study's clinical impact" and specially designed for the study will be addressed to the child's physician, physiotherapist or/and orthoprosthetist of the children amputees to assess the impact of energy expenditure measurement and gait analysis in guiding medical decisions and rehabilitative care at three to six months post enrolment. This self-questionnaire does not have an associated score.

from 3 to 6 months post-inclusion

Validation of the Physiological Cost Index (PCI) for the energy expenditure analysis in clinical routine

PCI formula : "PCI (beat/m) = \[end Hearth Rate (HR) - Rest HR (beat/min)\] / walking speed at the last minute of the 6 minutes walking test (m/min)"

Day 1 / Session 1 and Session 2