D-22: Free Communication/Poster – Clinical Exercise Testing: THURSDAY, JUNE 2, 2005 2:00 PM - 5:00 PM ROOM: Ryman C2
The aim of this study was to determine if measures of performance and cardiorespiratory stress observed during unsupported arm exercise (UAE) were reproducible in subjects with Multiple Sclerosis (MS). Seventeen ambulatory subjects, clinically diagnosed with MS volunteered to participate. Patients had mild to moderate MS (EDSS 2.5–6.5).
Subjects were screened for contraindications to exercise and ability to walk for 6 minutes. The UAE test (Takahasi et al, 2003) was employed using loads of 0.5, 1.0, 1.5 and 2.0 kg to maximal reach among 8 increments of .15m in height. Subjects performed the lifting test with two hands at a rate of 30 beats per minute set by a metronome and continued until they could go no further. Total time (TT) to exhaustion was recorded in seconds. Subjects returned within 10 days and repeated the test. Resting and peak exercise heart rate(PKHR) were measured with a heart rate monitor. Percent of age predicted maximum heart rate achieved at peak (%AAMHR) was calculated for each subject. Borg Scale (6–20) ratings of perceived exertion (RPE) were taken at rest and peak exercise (PKRPE). Peak workload (PKWK) in kg-m was calculated by multiplying the final weight by the height achieved for at least 30 seconds at the end of the test. The intraclass correlation coeeficient was determined for each cardiorespiratory variable from a repeated measures analysis of variance. The reproducibility of RPE and PKRPE was analyzed using Spearman rank correlation coefficient and a Friedman ANOVA. Level of significance was set at p < .05.
Comparing the two trials produced significant correlations for resting HR (ICC=.79, p < .00: mean difference = .41 +/− 7.07 bpm), PKHR (ICC= .82, p < .00; mean difference = 2.0 +/− 7.81bpm), %AAMHR (ICC =.72, p < .00, mean difference = .008+/−.055%), PKWK (ICC=.78, p < .00; mean difference=.046+/− .267kg-m) and TT (ICC=.84, p < .00; mean difference =13.94+/− 28.94 seconds). The ratings of perceived exertion were only significantly correlated; resting RPE (rs=.50, p=.04: mean difference =1.1+/− 2.5); PKRPE (rs=.76, p < .00; mean difference=0.2+/− 1.8).
The UAE test is reproducible between trials for high functioning individuals who are clinically diagnosed with MS. This test may be useful for documenting the impact of upper extremeity exercise training in this population.