This dataset contains gait data used to produce the results of the paper: 'Estimation of sagittal-plane whole-body angular momentum during perturbed and unperturbed gait using simplified body models. 10 healthy participants walked on a treadmill while receiving perturbations of the whole body angular momentum at the moment of toe off right. Meanwhile optical motion capture was recorded. The dataset contains the following measures: segmental angular momenta for each participant, gait events information, and evaluation metrics results used in the paper.