C A Leicht1, K E Griggs, J Lavin, K Tolfrey, V L Goosey-Tolfrey. 1. School of Sport, Exercise, and Health Sciences, The Peter Harrison Centre for Disability Sport, Loughborough University, Loughborough, LE11 3TU, UK, c.a.leicht@lboro.ac.uk.
Abstract
PURPOSE: The purpose of this study was to analyse the influence of spinal cord injury level on blood lactate (BLa) and ventilatory thresholds. METHODS: Ten athletes with tetraplegia (TETRA) and nine athletes with paraplegia (PARA) performed a graded wheelchair propulsion treadmill exercise step test to exhaustion. The aerobic and anaerobic BLa thresholds, the ventilatory threshold and the respiratory compensation point (RCP) were determined. RESULTS: The BLa thresholds were determined in 34 of 38 cases, ventilatory thresholds and RCPs in 31 of 38 cases. The anaerobic BLa threshold (76 ± 7 % [Formula: see text]) and the RCP (77 ± 8 % [Formula: see text]) did not differ significantly from each other (P = 0.92), with a coefficient of variation of 4.8 ± 3.4 % between thresholds. All other thresholds differed significantly from each other (P < 0.05). Thresholds expressed as the percentage of peak oxygen uptake did not differ between TETRA and PARA (P > 0.05) despite altered breathing in TETRA, which included a higher ventilatory equivalent for oxygen and a lower tidal volume. CONCLUSION: Measuring BLa leads to a higher threshold determination rate compared with ventilatory data and the anaerobic BLa threshold can be used to predict the RCP. The altered breathing in TETRA does not seem to have a pronounced effect on the ventilatory threshold or the RCP.
PURPOSE: The purpose of this study was to analyse the influence of spinal cord injury level on blood lactate (BLa) and ventilatory thresholds. METHODS: Ten athletes with tetraplegia (TETRA) and nine athletes with paraplegia (PARA) performed a graded wheelchair propulsion treadmill exercise step test to exhaustion. The aerobic and anaerobic BLa thresholds, the ventilatory threshold and the respiratory compensation point (RCP) were determined. RESULTS: The BLa thresholds were determined in 34 of 38 cases, ventilatory thresholds and RCPs in 31 of 38 cases. The anaerobic BLa threshold (76 ± 7 % [Formula: see text]) and the RCP (77 ± 8 % [Formula: see text]) did not differ significantly from each other (P = 0.92), with a coefficient of variation of 4.8 ± 3.4 % between thresholds. All other thresholds differed significantly from each other (P < 0.05). Thresholds expressed as the percentage of peak oxygen uptake did not differ between TETRA and PARA (P > 0.05) despite altered breathing in TETRA, which included a higher ventilatory equivalent for oxygen and a lower tidal volume. CONCLUSION: Measuring BLa leads to a higher threshold determination rate compared with ventilatory data and the anaerobic BLa threshold can be used to predict the RCP. The altered breathing in TETRA does not seem to have a pronounced effect on the ventilatory threshold or the RCP.
Authors: Ingrid Kouwijzer; Rachel E Cowan; Jennifer L Maher; Floor P Groot; Feikje Riedstra; Linda J M Valent; Lucas H V van der Woude; Sonja de Groot Journal: Spinal Cord Date: 2019-02-28 Impact factor: 2.772
Authors: Ingrid Kouwijzer; Mitch Valize; Linda J M Valent; Paul Grandjean Perrenod Comtesse; Lucas H V van der Woude; Sonja de Groot Journal: Eur J Appl Physiol Date: 2019-08-21 Impact factor: 3.078