Neuromuscular and metabolic comparisons between ramp and step incremental cycle ergometer tests

Area of Science:

• Exercise Physiology
• Sports Science
• Biomechanics

Background:

• Incremental exercise tests are crucial for assessing physiological responses.
• Comparing ramp and step protocols is essential for understanding their distinct effects on neuromuscular and metabolic parameters.

Purpose of the Study:

• To compare peak and submaximal neuromuscular and metabolic responses between ramp and step incremental cycle ergometer tests.
• To determine if different incremental test protocols elicit varying physiological demands.

Main Methods:

• Thirteen healthy adults (7 men, 6 women; age 23.4 ± 3.3 years) participated.
• Participants randomly underwent both ramp (15 W·min⁻¹) and step (30 W every 2 min) incremental tests.
• Two-way repeated measures ANOVA analyzed neuromuscular (EMG, MMG) and metabolic (O2, HR) data.

Main Results:

• The ramp test yielded lower mean EMG amplitude, oxygen consumption (O2), and heart rate (HR) at common power outputs.
• No significant differences were observed in mean MMG amplitude between the two protocols.

Conclusions:

• The greater total work produced during the step test (75.83 kJ) versus the ramp test (65.60 kJ) may explain the higher physiological strain.
• This suggests the step protocol might lead to greater fatigue-induced increases in muscle recruitment, oxygen consumption, and heart rate.