A public dataset of treadmill walking kinematics and kinetics at steady speeds in healthy individuals.

Human motion analysis is widely used in clinical practice to characterise motor function, gait impairments, and fall risk. However, available gait datasets are predominantly acquired at self-selected walking speeds and rarely include standardised slower speeds, despite their relevance for clinical populations. This article describes a publicly available dataset of three-dimensional gait kinematics and kinetics collected in healthy adults under controlled treadmill conditions. Forty-five participants, including young and older adults, performed walking trials at six predefined speeds ranging from 0.6 to 1.6 m·s⁻¹. Data acquisition was conducted using an optoelectronic motion capture system combined with an instrumented treadmill. The dataset includes three-dimensional marker trajectories, pelvis and lower limb joint kinematics in the sagittal, frontal, and transverse planes, as well as ground reaction forces, joint moments, and joint power. Raw data are provided in C3D format, and processed data are available as MATLAB-compatible files containing time-normalised gait cycles with associated mean values and variability metrics. The dataset is structured to allow comparisons across walking speeds and age groups, with consistent acquisition protocols and standardised processing pipelines. Supplementary files include statistical descriptors and detailed biomechanical variables across the gait cycle. In addition, a composite metric derived from gait kinematic data across multiple speeds is provided to support integrative analyses of gait patterns. This dataset can be reused for methodological development, validation of biomechanical models, and comparative analyses in both research and clinical contexts. The inclusion of standardised slow walking speeds and age-stratified data enables its use as a reference framework for evaluating gait patterns under conditions commonly encountered in clinical populations, including longitudinal assessments and comparisons with altered locomotor function.