Defintion for Energy return
The proportion of energy a running shoe's midsole or a surface gives back to the runner with each stride, rather than absorbing it.
Long Definition
Energy return refers to the efficiency with which a shoe or surface returns energy to the runner during each stride. It is crucial for minimizing fatigue and maximizing performance. For example, running on a well-cushioned shoe with high energy return can enhance speed and reduce the effort needed. This concept matters to runners as it influences comfort, speed, and overall running economy. Shoes with advanced materials, like those used by elite athletes, can provide significant energy return, helping them achieve faster times with less effort.
kaizen Insights
Higher energy-return shoes can make faster running feel easier. kaizen tracks the runs you do in them, and your pace and Fitness show how your training is progressing.
Category
Footwear & Gear
Questions and answers
What is Energy Return and why is it important?
Energy return is the proportion of energy a running shoe's midsole, or a running surface, gives back to the runner after compressing with each stride, rather than absorbing it. It is important because shoes with higher energy return, often using PEBA-based foams and carbon plates, can improve running economy, so a given pace feels easier and fatigue builds more slowly.
How is Energy Return measured?
Energy return is usually measured in laboratory tests on shoes and midsole foams. This can involve:
Compression tests that measure how much of the energy put into the foam is returned, expressed as a percentage.
Drop or rebound tests that record how high a weight bounces back from the material.
Biomechanical testing with runners, measuring oxygen cost at a set pace in different shoes.
How can I improve, manage, or optimise Energy Return?
Runners can make the most of energy return mainly through shoe choice and care. Here are some general strategies:
Save high-energy-return racing shoes for races and key sessions, and use durable trainers for everyday running.
Replace shoes when the midsole feels flat, typically after 500–800 km, as foam loses responsiveness over time.
Try shoes on a run before buying and choose a model that suits your gait and comfort.
