Ryan Alcantara

• MS, PhD Biomechanics
• Postdoctoral Research Fellow at Stanford University

The measurement of rearfoot kinematics by placing reflective markers on the shoe heel assumes its motion is identical to the foot’s motion. Studies have compared foot and shoe kinematics during running but with conflicting results. The primary purpose of this study was to compare shoe and calcaneus three-dimensional range of motion during running....

Preliminary data on the effect of running-specific prosthesis mass on running economy

Previous work has found that bending stiffness affects athletic performance and running economy. While the mechanisms responsible for these results are not completely understood, they suggest differences in muscle activity requirements. The objective of this study was to investigate the influence of running shoe bending stiffness on triceps surae m...

Objective Running with a stroller provides an opportunity for parents to exercise near their child and counteract health declines experienced during early parenthood. Understanding biomechanical and physiological changes that occur when stroller running is needed to evaluate its health impact, yet the effects of stroller running have not been clear...

Humans attain slower maximum velocity (vmax) on curves versus straightaways, potentially due to centripetal ground reaction force (GRF) production and depends on curve radius. Previous studies found GRF production differences between an athlete's inside versus outside leg relative to the center of the curve. Further, sprinting clockwise (CW) versus...

Background Ground reaction forces (GRFs) are important for understanding human movement, but their measurement is generally limited to a laboratory environment. Previous studies have used neural networks to predict GRF waveforms during running from wearable device data, but these predictions are limited to the stance phase of level-ground running....

Background Stress fractures are injuries caused by repetitive loading during activities such as running. The application of advanced analytical methods such as machine learning to data from multiple wearable sensors has allowed for predictions of biomechanical variables associated with running-related injuries like stress fractures. However, it is...

Ground reaction forces (GRFs) are important for understanding human movement, but their measurement is generally limited to a laboratory. Previous studies used neural networks to predict GRF waveforms during running from wearable device data, but these predictions are limited to the stance phase of level-ground running. We sought to develop a recur...

Background. Stress fractures are injuries caused by repetitive loading during activities such as running. The application of advanced analytical methods such as machine learning to data from multiple wearable sensors has allowed for predictions of biomechanical variables associated with running-related injuries like stress fractures. However, it is...

Inertial measurement units (IMUs) are popular tools for estimating biomechanical variables such as peak vertical ground reaction force (GRFv) and foot-ground contact time (tc), often by using multiple sensors or predictive models. Despite their growing use, little is known about the effects of varying low-pass filter cutoff frequency, which can aff...

Purpose: we determined the metabolic and biomechanical effects of adding mass to the running-specific prosthesis (RSP) and biological foot of individuals with a unilateral transtibial amputation (TTA) during running. Methods: 10 individuals (8 males, 2 females) with a TTA ran on a force-measuring treadmill at 2.5 m/s with 100 g and 300 g added t...

Purpose: We determined the metabolic and biomechanical effects of adding mass to the running-specific prosthesis (RSP) and biological foot of individuals with a unilateral transtibial amputation (TTA) during running.Methods: 10 individuals (8 males, 2 females) with a TTA ran on a force-measuring treadmill at 2.5 m/s with 100 g and 300 g added to th...

Following the transition to parenthood, people often initiate Stroller Running (SR) as it provides an opportunity for physical activity within proximity of their child. While the benefits of physical activity are well established, limited literature exists surrounding the potential disruption in gait and energetic cost caused by SR. Given that ther...

Limited primary literature exists surrounding the topic of Stroller Running and energetic cost. Here we investigate the effects of stroller running on energetic cost and the influence different pushing methods have on cost.

Here we test the hypothesis that running with a stroller is more energetically costly than running independently and that various pushing methods influence energetic cost.