ORIGINAL ARTICLE  EXERCISE PHYSIOLOGY AND BIOMECHANICS 

The Journal of Sports Medicine and Physical Fitness 2022 May;62(5):626-32

DOI: 10.23736/S0022-4707.21.12285-6

Copyright © 2021 EDIZIONI MINERVA MEDICA

lingua: Inglese

Relationship between functional threshold power, ventilatory threshold and respiratory compensation point in road cycling

Sebastian SITKO ¹ ✉, Rafel CIRER-SASTRE ², Francisco CORBI ², Isaac LÓPEZ-LAVAL ¹

¹ Section of Physical Education and Sports, Department of Physiatry and Nursery, Faculty of Health and Sport Sciences, University of Zaragoza, Huesca, Spain; ² National Institute of Physical Education of Catalonia - INEFC, University of Lleida - UdL, Lleida, Spain

BACKGROUND: The purpose of this study was to assess the relationship between power output and relative power output at the functional threshold power, ventilatory threshold and respiratory compensation point in road cyclists.
METHODS: Forty-six road cyclists (age 38±9 years; height 177±9 cm; body mass 71.4±8.6 kg; Body Mass Index 22.7±2.2 kg·m^-1; fat mass 7.8±4%, V̇O2max 61.1±9.1 mL·min^-1·kg^-1) performed a graded exercise test in which power output and relative power output at the ventilatory landmarks were identified. Functional threshold power was established as 95% of the power output during a 20-minute test.
RESULTS: Power output and relative power output at the functional threshold power were higher than at the ventilatory threshold (P<0.001). There were very large to near perfect correlations for power output (95% CI for r from 0.71 to 0.9) and relative power output (95% CI for r from 0.79 to 0.93) at the functional threshold power and respiratory compensation point. Mean bias in power output and relative power output measured at RCP compared with FTP was not significant (mean bias 95% CI from -7 to 10 W and -0.1 to 0.1 W/kg, respectively).
CONCLUSIONS: Power output and relative power output at the functional threshold power are higher than at the ventilatory threshold. Power output and relative power output at the functional threshold power and respiratory compensation point are strongly related, but caution is required when using both concepts indistinctly.

KEY WORDS: Physical endurance; Education; Athletic performance