Table 2—

The frequency of oscillation of the physiotherapy interventions as determined by frequency spectral analysis

InterventionFrequency Hz
Vibration8.4±0.4 (7.3–10.0)
Percussion7.3±0.3 (6.5–8.0)
Flutter®11.3±1.5 (7.5–13.7)***
Acapella®13.5±1.7 (10.0–18.3)***
  • Data are presented as mean±sd of means of each subject. p-value is significantly different from vibration. ***: p<0.001.