TY - JOUR
T1 - Energy demands of walking in persons with postpoliomyelitis syndrome: relationship with muscle strength and reproducibility
AU - Brehm, Merel-Anne
AU - Nollet, Frans
AU - Harlaar, Jaap
PY - 2006
Y1 - 2006
N2 - OBJECTIVES: To describe the energy demands of walking in subjects with postpoliomyelitis syndrome (PPS) in comparison with the demands in healthy subjects, and to assess the reproducibility of walking energy measurements. DESIGN: Four repeated measurements with a 1-week interval between each measurement. SETTING: Outpatient clinic of a university hospital. PARTICIPANTS: Fourteen subjects with PPS and 14 age- and sex-matched healthy subjects. INTERVENTIONS: Not applicable. MAIN OUTCOME MEASURES: Walking speed and energy cost of walking. The correlation parameter was lower-extremity muscle strength sum (MSS). The reproducibility parameters were standard error (SE) of measurement and smallest detectable difference (SDD). RESULTS: Walking speed in subjects with PPS (61.8 m/min) was significantly lower (-28%) and energy cost (4.8 J.kg(-1).m(-1)) was significantly higher (40%) than in healthy subjects. MSS correlated strongly with energy cost (r=-.84, P=.000), explaining 71% of the variance. The SE of measurement of energy cost measurements ranged between 1.7% and 3.4% for PPS subjects and between 1.2% and 2.4% for healthy subjects. The SDD ranged between 4.6% and 9.4% for PPS subjects and between 3.3% and 6.6% for healthy subjects, depending on the number of repeated measurements that were considered. CONCLUSIONS: Energy cost of walking in subjects with PPS is strongly related to the extent of muscle weakness in the lower extremities. Although variability was greater for PPS subjects than for healthy subjects, reproducibility of energy cost measurements was high. Therefore, metabolic assessment of energy cost of walking is a sensitive tool that can reveal clinically relevant changes even in the condition of a person with PPS
AB - OBJECTIVES: To describe the energy demands of walking in subjects with postpoliomyelitis syndrome (PPS) in comparison with the demands in healthy subjects, and to assess the reproducibility of walking energy measurements. DESIGN: Four repeated measurements with a 1-week interval between each measurement. SETTING: Outpatient clinic of a university hospital. PARTICIPANTS: Fourteen subjects with PPS and 14 age- and sex-matched healthy subjects. INTERVENTIONS: Not applicable. MAIN OUTCOME MEASURES: Walking speed and energy cost of walking. The correlation parameter was lower-extremity muscle strength sum (MSS). The reproducibility parameters were standard error (SE) of measurement and smallest detectable difference (SDD). RESULTS: Walking speed in subjects with PPS (61.8 m/min) was significantly lower (-28%) and energy cost (4.8 J.kg(-1).m(-1)) was significantly higher (40%) than in healthy subjects. MSS correlated strongly with energy cost (r=-.84, P=.000), explaining 71% of the variance. The SE of measurement of energy cost measurements ranged between 1.7% and 3.4% for PPS subjects and between 1.2% and 2.4% for healthy subjects. The SDD ranged between 4.6% and 9.4% for PPS subjects and between 3.3% and 6.6% for healthy subjects, depending on the number of repeated measurements that were considered. CONCLUSIONS: Energy cost of walking in subjects with PPS is strongly related to the extent of muscle weakness in the lower extremities. Although variability was greater for PPS subjects than for healthy subjects, reproducibility of energy cost measurements was high. Therefore, metabolic assessment of energy cost of walking is a sensitive tool that can reveal clinically relevant changes even in the condition of a person with PPS
U2 - https://doi.org/10.1016/j.apmr.2005.08.123
DO - https://doi.org/10.1016/j.apmr.2005.08.123
M3 - Article
C2 - 16401452
SN - 0003-9993
VL - 87
SP - 136
EP - 140
JO - Archives of physical medicine and rehabilitation
JF - Archives of physical medicine and rehabilitation
IS - 1
ER -