All-out intermittent exercise on a one-leg knee extension ergometer: mechanical and physiological responses to different resistance forces

Author(s)

Norberto, Matheus Silva ; Putti, Germano Marcolino ; Torini, Joao Victor Gatto ; Figueira, Tiago Rezende ; Papoti, Marcelo

• Document type: Journal article
• Source: ERGONOMICS; v. N/A, p. 12-pg., 2025-03-03.

Abstract

This study aimed to evaluate mechanical and physiological responses to all-out high-intensity interval training (HIIT) sessions (10 maximal efforts of 30 seconds each with 4 min of rest) performed against different resistance forces on a one-leg knee extension ergometer. Eighteen men conducted an incremental test to determine the resistance associated with its maximal power (R-max), followed by all-out HIIT sessions at 120%, 160%, and 200% of R-max, while oxygen consumption and neuromuscular function were measured. Mechanical power output was higher during the session at 200% of R-max compared to the other sessions (p < 0.001), but its absolute anaerobic energy contribution was similar to that at 160% of R-max. Notably, the all-out efforts at 200% R-max led to inconsistent kicking cadence and some participants were unable to complete the session. Therefore, 160% R-max was the highest suitable resistance force for a consistent all-out HIIT session on a knee extension ergometer. (AU)

• FAPESP's process: 21/02403-1 - Effects of intermittent recovery hypoxia on molecular, metabolic and neuromuscular responses
• Grantee: Matheus Silva Norberto
• Support Opportunities: Scholarships in Brazil - Doctorate