title: Cardiorespiratory and perceptual responses to arm crank and wheelchair exercise using various handrims in male paraplegics.
abstract: The purpose of the present study was to determine the effects of 10-in [0.25-m] versus 16-in [0.41-m] wheelchair handrims on cardiorespiratory and psychophysiological exercise responses during wheelchair propulsion at selected velocities. Fifteen male paraplegics (27.0 +/- 5.5 yrs) performed three discontinuous exercise tests (ACE = arm crank ergometer; WERG = wheelchair roller ergometer) and two 1600-m performance-based track trials (TRACK) under simulated race conditions. There were no significant differences in HR, VO2, VE, HLa, or category-ratio ratings of perceived exertion (RPE) using different handrims during wheelchair propulsion at 4 km.h-1. In contrast, at 8 km.h-1 subjects demonstrated a 13% lower steady state VO2 (p less than .05) using the 10-in handrims, coincident with a 23% lower VE. Steady state HR during WERG at 8 km.h-1 using the 10-in (124.4 +/- 3.9 b.min-1) or 16-in (130.6 +/- 4.6 b.min-1) handrims were not significantly different. There were also no significant differences between ACE or WERG conditions during maximal effort for VO2 or VE. However, HRpeak during ACE was 7% higher than HRpeak during WERG16 (183 +/- 15 b.min-1 vs. 171 +/- 12 b.min-1, p less than .05), and whole blood HLa during ACE was also significantly higher (by 2.3-2.5 mmol; p less than .05) compared to WERG. There were no significant differences for HR, performance time, or RPE between trials using different handrim diameters during the 1600-m event.(ABSTRACT TRUNCATED AT 250 WORDS)
authors.affiliation: Wright State University.
authors.forename: G W
authors.initials: GW
authors.lastname: Gayle
authors.forename: R L
authors.initials: RL
authors.lastname: Pohlman
authors.forename: R M
authors.initials: RM
authors.lastname: Glaser
authors.forename: G M
authors.initials: GM
authors.lastname: Davis
mesh_terms: D000328:Adult; D001696:Biomechanical Phenomena; D015444:Exercise / Q000502:physiology*; D006801:Humans; D008297:Male; D010264:Paraplegia / Q000503:physiopathology* / Q000523:psychology; D010465:Perception; D011603:Psychophysiology; D015656:Respiratory Mechanics; D014481:United States; D014910:Wheelchairs