# Eccentric Cycling in the Real Life: A Case Report Exploring Riding Downhill with a Brakeless Bicycle

## TL;DR

This case study examines how a cyclist controls speed downhill using a brakeless bicycle, revealing unique muscle activation patterns.

## Contribution

The study identifies distinct neuromuscular strategies for downhill cycling without brakes, offering insights for both safety and rehabilitation.

## Key findings

- Eccentric cycling uses short, low-intensity muscle contractions to control speed.
- Isometric pedaling is more efficient for deceleration with longer, intensive contractions.
- Isometric activation was significantly higher than eccentric for several lower limb muscles.

## Abstract

This case study aimed to explore neuromuscular strategies used by a cyclist to control the speed while riding downhill a mountain with a brakeless, fixed-gear bicycle. Accelerations of the pedals and electromyographic activity of four lower limb muscles were registered to determine muscle activation during two decelerating strategies. Eccentric cycling was mostly used to control the bicycle speed with short (536 ± 51 ms) and low-intensity contractions. Isometric pedaling cycles were more efficient for decelerations with long (1,092 ± 281 ms) and intensive contractions. Isometric muscle activation was 122, 31, 25 and 44% greater than eccentric for vastus lateralis, biceps femoris, gastrocnemius lateralis and tibialis anterior muscle, respectively. This study suggests specific activation patterns to help the practitioner for safety rides, but that could have implications for rehabilitation purposes.