Blood Lactate’s Relationship with Step Kinematic Asymmetry, Stance-Phase Biomechanics, and Spring–Mass Model Variables at the Transition from Curve to Straight Sprinting in the 200 m Dash: A Cross-Sectional Study

Kyprianou, E, Saraslanidis, P, Tsalis, G ORCID: 0000-0003-3912-9082 and Panoutsakopoulos, V ORCID: 0000-0002-9832-0314 (2026) Blood Lactate’s Relationship with Step Kinematic Asymmetry, Stance-Phase Biomechanics, and Spring–Mass Model Variables at the Transition from Curve to Straight Sprinting in the 200 m Dash: A Cross-Sectional Study. Journal of Functional Morphology and Kinesiology, 11 (3). p. 335. ISSN 2411-5142

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Abstract

Background: Curve sprinting in the 200 m dash entails distinct biomechanical requirements under strenuous anaerobic conditions that differ from sprinting on the straightway. This study aimed to examine possible relationships between anaerobic biomarkers (specifically, peak post-test blood lactate concentration; BLa) and step kinematic asymmetry, stance-phase biomechanics, and spring–mass model (SMM) variables at the curve-to-straight transition during a 200 m sprint. Methods: Sixteen adult male club- and national-level sprinters performed a maximal 200 m sprint test in this exploratory cross-sectional study. Kinematical data were recorded for the first step immediately after the geometric end of the curve, and peak BLa was measured at 3, 5, and 7 min post-test. Based on data normality, differences in inter-limb step parameters were examined using a paired t-test or Wilcoxon signed-rank test. Pearson’s and Kendall’s correlation coefficients evaluated the relationships between BLa and the biomechanical variables (significance level: a = 0.05). Results: Peak BLa was 16.16 ± 2.61 mmol/L and demonstrated no significant correlation (p > 0.05) with sprint time (24.89 ± 1.24 s). Only stride and step frequency during the outer-to-inner leg step was correlated (p < 0.05) with BLa. Furthermore, the step initiated by the outer leg had a larger length (p < 0.05) compared to the step length generated from the inner leg. Conclusions: These findings stem from the different roles between legs while handling the centripetal force requirements during curve sprinting. The outer leg generated a longer step to facilitate curve-to-straight transition, whereas the inner leg functioned primarily to stabilize and steer the body.

Item Type:	Article
Uncontrolled Keywords:	angular kinematics; biomechanical analysis; fatigue; neuromuscular system; speed; sport performance; spring–mass model; stiffness; track and field; work physiology; 32 Biomedical and Clinical Sciences; 42 Health Sciences; 4207 Sports Science and Exercise; 3209 Neurosciences; 4201 Allied health and rehabilitation science; 4207 Sports science and exercise
Subjects:	R Medicine > RC Internal medicine > RC1200 Sports Medicine
Divisions:	Sport and Exercise Sciences
Publisher:	MDPI AG
Date of acceptance:	24 August 2026
Date of first compliant Open Access:	9 October 2026
Date Deposited:	09 Oct 2026 09:48
Last Modified:	09 Oct 2026 09:48
DOI or ID number:	10.3390/jfmk11030335
URI:	https://researchonline.ljmu.ac.uk/id/eprint/29637

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