Work

Validation of muscle oxygenation kinetics to predict aerobic fitness and exercise transition thresholds

Year: 2025

Type: article

Abstract: The aim of this study was to validate previously developed equations to predict maximal oxygen uptake () from near‐infrared spectroscopy (NIRS) during and after a period of limb ischaemia. Moreover, NIRS recovery kinetics after steady‐state exercise (SSE) could be used to monitor and exercise intensity thresholds. Seventeen healthy adults completed a 3 min 300 mmHg pressure cuff occlusion to measure the occlusion slope, relative rate of muscle reoxygenation at 10 s (Rep 10s), baseline ( R bl ), peak ( R peak ) and area under the curve (AUC 2min ). SSE was performed at 100 W (SSE1) and 150 W (SSE2) to determine the relative rate of muscle reoxygenation ( R 1 bl and R 2 bl ). Thereafter, incremental maximal cycling was used to determine , ventilatory thresholds (VTs) and gross efficiencies (GEs). The values of Rep 10s ( r = 0.61, p = 0.02), R bl ( r = 0.53, p = 0.04), R peak ( r = 0.60, p = 0.02), AUC 2min ( r = 0.67, p < 0.01) and occlusion slope ( r = −0.68, p = 0.005) were correlated with absolute . After steady‐state cycling, SSE1 R bl was correlated with absolute ( r = 0.67, p = 0.01) and relative ( r = 0.60, p = 0.02), in addition to absolute VT1 ( r = 0.66, p = 0.01) and relative VT1 ( r = 0.61 p = 0.02). The SSE2 R bl was correlated with absolute ( r = 0.58, p = 0.02), relative ( r = 0.63, p = 0.02), absolute VT2 ( r = 0.56, p = 0.03), relative VT2 ( r = 0.62, p = 0.01) and GE2 ( r = 0.56, p = 0.03). Using previously defined prediction equations, could be predicted with a modest degree of typical error (Rep 10s, 521 mL min −1 ; R peak , 525 mL min −1 ; slope, 393 mL min −1 ). NIRS kinetic profiles during or after a period of ischaemia or after SSE are related to and exercise intensity thresholds. Nonetheless, their predictive validity is limited to a broad estimate of the aerobic fitness of an individual.

Source: Experimental Physiology

DOI: 10.1113/ep092908

Authors: Heru Syarli Lesmana, Ben Schroeder, Kyohei Marume, Patrick Rodrigues, Justin S. Lawley

Institutions: Universität Innsbruck, State University of Padang, National Cerebral and Cardiovascular Center, University of Waikato

Language: English

Topic: Cardiovascular and exercise physiology

Subfield: Complementary and alternative medicine

Field: Medicine

Domain: Health Sciences

SDG: Good health and well-being

Open Access status: gold

Estimated APC paid: $2,940