Vibration-induced Behavioral Responses and Response Threshold in Female C57BL/6 Mice

Area of Science:

• Laboratory animal science
• Animal behavior
• Biomedical research

Background:

• Established limits for rodent vibration exposure in laboratory animal facilities are lacking.
• Documented adverse effects of vibration on rodents necessitate establishing exposure guidelines.

Purpose of the Study:

• Determine vibration frequencies most sensitive to behavioral changes in mice.
• Identify the highest vibration magnitude that does not induce behavioral changes.
• Characterize behavioral responses to vibration and assess habituation.

Main Methods:

• Female C57BL/6 mice were exposed to vibration frequencies from 20 to 190 Hz.
• Accelerations ranged from 0.05 to 1.0 m/s², with behavioral responses videorecorded and scored.
• Specific frequencies and accelerations were tested to identify sensitivity thresholds and response patterns.

Main Results:

• Mice exhibited the most significant behavioral responses at 1.0 m/s² acceleration.
• Peak sensitivity to vibration occurred between 70 and 100 Hz at intermediate accelerations (0.5 and 0.75 m/s²).
• No discernible behavioral responses were observed at the lowest acceleration (0.05 m/s²); responses were transient (2-10 seconds) and habituation was noted with repeated exposure.

Conclusions:

• Mice are particularly sensitive to vibrations within the 70-100 Hz range.
• A vibration acceleration of 0.05 m/s² appears to be a safe threshold, eliciting no behavioral response.
• Understanding these vibration parameters is essential for maintaining rodent welfare and ensuring reliable experimental outcomes in laboratory settings.