Fig 1.
Oxygen uptake response to the 6-minute walk test.
Oxygen uptake raw data measured breath-by-breath from a sixty-two-year-old woman with stroke and severe motor function impairment. The vertical three dashed lines indicate the sit-to-stand, stand-to-test, and test-to-sit phases, in sequence. Each data point indicates breath-by-breath values averaged every 3 seconds. 6MWT, six-minute walk test; mL/kg/min, milliliter per kilogram per minute; MRTOFF, mean response time of oxygen uptake off-kinetics; MRTON, mean response time of oxygen uptake on-kinetics; s, second; , oxygen uptake;
, oxygen uptake during the recovery period;
, oxygen uptake at rest;
, oxygen uptake during effort at steady-state level.
Fig 2.
Oxygen uptake on- (A and C) and off-kinetics (B and D) response to the 6-minute walk test. Oxygen uptake raw data (A and B) measured breath-by-breath from a sixty-two-year-old woman with stroke and severe motor function impairment. The outliers (values above 3 standard deviations) were removed and a moving average filter was used by averaging the values over consecutive periods of 8 breaths (C and D). The vertical two dashed lines in each panel indicate the beginning and the end of the posture transition, in sequence. mL/kg/min, milliliter per kilogram per minute; s, second; , oxygen uptake;
, oxygen uptake at rest;
, oxygen uptake during the recovery period;
, oxygen uptake during effort at steady-state level;
, oxygen uptake on-kinetics magnitude of response (
-
);
, oxygen uptake off-kinetics magnitude of response (
-
).
Fig 3.
Flow chart for selecting the participants for this correlational, cross-sectional pilot study.
6MWT, six-minute walk test; FAC, functional ambulation category; MMSE, Mini-Mental State Examination.
Table 1.
Participant demographic and clinical characteristics (n = 24).
Table 2.
Metabolic and kinetics response to the six-minute walk test (n = 24).
Table 3.
Relationship between the oxygen uptake kinetics and the underlying mechanisms (n = 24).