Rotarod
Overview
The rotarod test is the most widely used assay for motor coordination, balance, and fatigue resistance in rodents. Animals are placed on a rotating cylinder that accelerates from a slow starting speed (typically 4 RPM) to a maximum speed (40 RPM) over a defined ramp period. The primary endpoint is latency to fall — the time at which the animal can no longer maintain its position on the accelerating rod.
The accelerating rotarod variant is preferred over fixed-speed protocols because it provides a continuous measure of motor capability across a range of coordination demands. It is sensitive to cerebellar lesions, dopaminergic depletion (Parkinson models), muscle weakness, sedation, and motor learning — making it a core phenotyping tool in neuroscience and drug development.
ConductMaze controls the rotarod motor speed profile, detects falls via the trip plate sensor, and records latency and RPM at fall for each subject simultaneously across multiple lanes. The software supports custom acceleration profiles, repeated-trial protocols with inter-trial rest periods, and multi-day motor learning paradigms.
Trial Flow
Place Subjects
Place animals on rod at starting speed
Acceleration
Rod accelerates from start to max RPM
Fall Detection
Trip plate sensor triggers on fall
Record Data
Log latency, RPM at fall, lane ID
Rest Period
Inter-trial rest (if multiple trials)
Next Trial/End
Repeat or end session
Parameters
| Parameter | Type | Default | Description |
|---|---|---|---|
| Start Speed | RPM | 4 | Initial rotation speed |
| Max Speed | RPM | 40 | Maximum rotation speed at end of acceleration |
| Ramp Duration | seconds | 300 | Time over which speed increases from start to max |
| Max Trial Time | seconds | 300 | Maximum time on rod before automatic trial end |
| Number of Trials | integer | 3 | Trials per session (mean latency computed) |
| Inter-Trial Rest | seconds | 300 | Rest period between consecutive trials |
| Number of Lanes | integer | 4 | Simultaneous subjects on multi-lane rotarod |
| Direction | enum | Forward | Rotation direction (Forward, Reverse, Alternating) |
Metrics
| Metric | Unit | Description |
|---|---|---|
| Latency to Fall | seconds | Time from trial start to fall — primary motor coordination index |
| RPM at Fall | RPM | Rotation speed at the moment of fall |
| Mean Latency | seconds | Average latency across all trials in the session |
| Best Latency | seconds | Maximum latency achieved across trials |
| Learning Slope | s/trial | Improvement rate across multi-day sessions |
| Passive Rotations | count | Number of times animal rides the rod without active walking |
Sample Data
| Subject | Day | Trial | Latency_s | RPM_at_Fall | Lane |
|---|
Representative data for illustration purposes. Actual values will vary by species, strain, and experimental conditions.
Applications
- 1Parkinson disease models — motor deficit quantification after 6-OHDA or MPTP lesions
- 2Drug sedation profiling — dose-dependent motor impairment from benzodiazepines, antipsychotics
- 3Cerebellar ataxia research — balance and coordination deficits in genetic models
- 4Motor learning — acquisition curves across multi-day training protocols
- 5Neuromuscular disease — progressive motor decline in ALS, SMA, and muscular dystrophy models
Related Protocols
Compatible Products
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