Cristin-prosjekt-ID: 315060
Sist endret: 8. mai 2013 10:49
Cristin-prosjekt-ID: 315060
Sist endret: 8. mai 2013 10:49
Prosjekt

Energy expenditure of transfemoral amputees walking on a horizontal and tilted treadmill simulating different outdoor walking conditions

prosjektleder

Inger-Marie Starholm
ved Institutt for ergoterapi og ortopediingeniørfag ved OsloMet - storbyuniversitetet

prosjekteier / koordinerende forskningsansvarlig enhet

  • Institutt for ergoterapi og ortopediingeniørfag ved OsloMet - storbyuniversitetet

Tidsramme

Avsluttet
Start: 1. mars 2007 Slutt: 1. juni 2010

Beskrivelse Beskrivelse

Tittel

Energy expenditure of transfemoral amputees walking on a horizontal and tilted treadmill simulating different outdoor walking conditions

Vitenskapelig sammendrag

Abstract Background and aim: Transfemoral amputees often report that walking on tilted pavements or in terrain with the prosthesis on the highest side is quite strenuous. This study investigates the energy expenditure of transfemoral amputees (n=8) walking on altered treadmill positions simulating different outdoor walking conditions. Method: Oxygen uptake at self selected speed of gait was measured during walking at three different treadmill positions: (I) Horizontal treadmill, (II) 3 % tilt in the sagittal plane and (III) 3 % tilt in both the sagittal and frontal plane of the treadmill. Results: The difference in oxygen uptake between position l and ll was in median 4,3%, and 16,4% between position II and III (p≤ 0, 05 for all comparisons). The subjects utilized about 50% of their VO2 max when walking in position I and ll while energy expenditure increased to about 60% of the amputees VO2max when walking in position lll. Conclusion: Transfemoral amputees use significantly more energy when walking on a moderately tilted surface in the frontal plane compared to walking with a tilt in the sagittal plane only. The prosthetic leg becomes functionally too long when the walking surface is tilted sideways, and the transfemoral amputees adopt a more energy consuming gait pattern.

Metode

An experimental design was chosen for the study, where each subjects responses to three different walking positions of a motorized treadmill The sequence of testing started for all the subjects by measuring their maximal aerobic capacity (VO2max) by a modified Naughton protocol (11). In short: The subjects started by walking on a horizontal treadmill at their self-selected speed for 10 minutes. Following this warm-up procedure, the inclination of the treadmill was increased by 3 % every 3 rd minute until exhaustion, while the speed was kept constant. In general, VO2max was reached within 10-15 minutes following this protocol. After the VO2max test, the subjects rested for a minimum of 30 minutes before the experiments in treadmill position I – ll and III started. These tests were performed in a randomized order. In walking position I the subjects were walking on a horizontal treadmill. Position ll was walking on a treadmill with 3 % inclination in the sagittal plane, and in position lll the subjects were walking on a treadmill with 3 % inclination in the sagittal plane and 3 % tilt in the frontal plane with the prosthesis at the highest side.

Utstyr

An experimental design was chosen for the study, where each subjects responses to three different walking positions of a motorized treadmill (Woodway ELG70, Woodway, Germany), were compared in a random order Ventilatory (VE) and respiratory (VO2,VCO2) data during treadmill walking was collected during the last five minutes (steady state) of each experiment by a stationary ergospirometer (Sensor Medics Vmax229n, CA, USA). Heart rate was monitored by a Polar heart rate monitor (Polar Electro, Finland) and the Borg CR10 Scale was utilized to investigate the subjects’ perceived exertion during the experiments

prosjektdeltakere

prosjektleder

Inger-Marie Starholm

  • Tilknyttet:
    Prosjektleder
    ved Institutt for ergoterapi og ortopediingeniørfag ved OsloMet - storbyuniversitetet

Terje Gjøvaag

  • Tilknyttet:
    Prosjektdeltaker
    ved Institutt for fysioterapi ved OsloMet - storbyuniversitetet

Anne Marit Mengshoel

  • Tilknyttet:
    Prosjektdeltaker
    ved Avdeling for tverrfaglig helsevitenskap ved Universitetet i Oslo
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