Patterns of responses for neuromuscular and metabolic parameters for ramp versus step incremental cycle ergometer tests.

摘要

The purposes of the present study were twofold: (1) to examine the patterns of electrical (EMG), mechanical (MMG), metabolic (V˙O 2 and HR), and RPE responses for ramp (15 W·min-1 ) versus step (30 W increments every two min) incremental cycle ergometer tests; and (2) to examine the effects of the ramp and step incremental tests on the EMG and MMG signals (amplitude and MPF) from electrodes and accelerometers placed over the innervation zone (Over IZ) and proximal to the IZ (Prox IZ). Fourteen subjects (mean age and body weight +/- SD = 23.36 +/- 3.34 years and 71.65 +/- 11.10 kg) visited the laboratory on three separate occasions. The initial visit was an orientation session and the next two visits were randomly ordered ramp or step incremental tests. Three-way and two-way repeated measures ANOVAs with appropriate follow-ups procedures, as well as paired t-tests were used to analyze the data. In addition, polynomial regression analyses were used to determine the patterns of responses for each dependent variable for the ramp and step incremental tests. The polynomial regression analyses showed that most subjects had the same patterns of responses for the ramp and step incremental tests for EMG amplitude (79%), HR (86%), and RPE (93%), but different patterns for EMG MPF (70%), MMG amplitude (57%), MMG MPF (50%), and 2 (71%). Furthermore, most subjects had the same patterns of responses for the Prox IZ and Over IZ locations for EMG amplitude (86 to 93%), but different patterns for EMG MPF (50 to 57%), MMG amplitude (47 to 57%), and MMG MPF (43 to 57%). The ramp incremental test resulted in lower mean EMG amplitude, V˙O2, and HR values at the common power outputs, but greater peak power output than the step incremental test. The Prox IZ location had greater mean EMG and MMG MPF values than Over IZ, but no significant differences were found for EMG and MMG amplitude values.