T&C April/May - 22

Tech Guide 2023
Measuring Motion
Vanderbilt using motion capture tech to
assess movement patterns
By Vanderbilt University Athletics Department
I
t starts as persistent and irritating pain in the foot
or lower leg, then it gets more intense, maybe with
swelling, and soon a runner knows she's being
sidelined by one of the most common running injuries:
a stress fracture. These tiny cracks in the bone can halt
training for months or even end a sports season.
A segment of the multibillion-dollar wearables
industry aims to save potential victims from this fate.
Still, a Vanderbilt University engineering professor
found a significant problem: the devices are measuring
the wrong thing.
Working with a local running club, an orthopedic
specialist who advises the NFL Players Association and
a team of Vanderbilt engineers, Assistant Professor
of Mechanical Engineering Karl Zelik discovered that
22 | Training & Conditioning | April/May 2023
sensors only measure the impact of the foot hitting the
pavement - which is what virtually all of them do - tell
users little about the forces on bones that lead to stress
fractures.
His research confirmed that the vast majority of force
on the bone is actually from muscles contracting, not
from the foot's impact on the ground, a finding widely
overlooked by both the wearables industry and many
scientific studies.
Zelik's research, appearing in the peer-reviewed
journal PLOS One and titled " Ground reaction force
metrics are not strongly correlated with the tibial
bone load when running across speeds and slopes:
Implications for science, sport, and wearable tech, "
offers the clearest and simple demonstration of the

T&C April/May

Table of Contents for the Digital Edition of T&C April/May

Table of Contents
Editor's Letter
From Rehab to Robustness
Nutrition: Myth-Busting Nutrition Tips
Strength & Conditioning: Prioritizing Preseason Programs
2023 Tech Guide
Measuring Motion
Decreasing Injuries with Data
Tactical Transition
Developing a Strong & Powerful Base
Product Focus: NATA AT Expo Sneak Preview
Product Marketplace
Advertisers Index
T&C April/May - 1
T&C April/May - 2
T&C April/May - Table of Contents
T&C April/May - Editor's Letter
T&C April/May - 5
T&C April/May - From Rehab to Robustness
T&C April/May - 7
T&C April/May - 8
T&C April/May - 9
T&C April/May - Nutrition: Myth-Busting Nutrition Tips
T&C April/May - 11
T&C April/May - 12
T&C April/May - 13
T&C April/May - Strength & Conditioning: Prioritizing Preseason Programs
T&C April/May - 15
T&C April/May - 16
T&C April/May - 17
T&C April/May - 18
T&C April/May - 19
T&C April/May - 20
T&C April/May - 2023 Tech Guide
T&C April/May - Measuring Motion
T&C April/May - Decreasing Injuries with Data
T&C April/May - 24
T&C April/May - 25
T&C April/May - 26
T&C April/May - 27
T&C April/May - 28
T&C April/May - 29
T&C April/May - Tactical Transition
T&C April/May - 31
T&C April/May - Developing a Strong & Powerful Base
T&C April/May - 33
T&C April/May - 34
T&C April/May - 35
T&C April/May - 36
T&C April/May - 37
T&C April/May - Product Focus: NATA AT Expo Sneak Preview
T&C April/May - 39
T&C April/May - Product Marketplace
T&C April/May - 41
T&C April/May - Advertisers Index
T&C April/May - 43
T&C April/May - 44
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