S. L. Delp

Hamstrings are stretched more and faster during accelerative running compared to speed-matched constant speed running

This study compares hamstring mechanics during accelerative and constant speed running, finding greater muscle-tendon lengths and lengthening velocities during acceleration.

How Connecting the Legs with a Spring Improves Human Running Economy

This study uses simulations to show that a spring connecting legs reduces energy expenditure during running by decreasing mechanical work and heat production in multiple muscle groups.

Simulating the effect of ankle plantarflexion and inversion-eversion exoskeleton torques on center of mass kinematics during walking

This study simulates how ankle exoskeleton torques affect center of mass kinematics during walking, showing torque type and timing influence movement patterns.

Can static optimization detect changes in peak medial knee contact forces induced by gait modifications?

This study evaluates static optimization's ability to detect changes in medial knee contact forces from gait modifications using simulated data compared to instrumented knee replacement measurements.

OpenCap: 3D human movement dynamics from smartphone videos

OpenCap provides an open-source platform to compute human movement dynamics from smartphone videos, enabling accurate prediction of biomechanical metrics at lower cost and faster speed than traditional methods.

Coupled exoskeleton assistance simplifies control and maintains metabolic benefits: a simulation study

This study evaluates multi-joint exoskeleton assistance using simulations, finding that coupled control strategies achieve similar metabolic savings to independent control with simpler designs.

An open-source and wearable system for measuring 3D human motion in real-time

The paper introduces OpenSenseRT, an open-source wearable system for real-time 3D motion tracking, showing it is accurate and cost-effective compared to optical motion capture.

Biceps femoris long head sarcomere and fascicle length adaptations after three weeks of eccentric exercise training

This study investigates if three weeks of eccentric exercise increases Biceps femoris long head fascicle length through sarcomere addition, finding instead that sarcomere length increases without changes in sarcomere number.

Muscle coordination retraining inspired by musculoskeletal simulations: a study on reducing knee loading

This study uses musculoskeletal simulations to retrain muscle coordination via biofeedback, reducing knee loading in healthy individuals during walking.

OpenSim Moco: Musculoskeletal optimal control

The paper introduces OpenSim Moco, a software toolkit for musculoskeletal optimal control, demonstrating its ability to solve motion tracking, prediction, and device design problems.

Foot strike pattern during running alters muscle-tendon dynamics of the gastrocnemius and the soleus

This study compares muscle-tendon dynamics in the gastrocnemius and soleus during rearfoot and forefoot striking running patterns, finding differences in energy storage and fiber work.

Predicting gait adaptations due to ankle plantarflexor muscle weakness and contracture using physics-based musculoskeletal simulations

The paper uses physics-based musculoskeletal simulations to predict gait adaptations caused by ankle plantarflexor muscle weakness and contracture, revealing heel-walking and toe-walking patterns under severe deficits.

Rapid energy expenditure estimation for assisted and inclined loaded walking

This paper develops models to rapidly estimate energy expenditure during walking with assistive devices and loads, achieving average errors of 4.4-11.7% across three use cases.