Pohlman et al. (1997) found a
non-significant tendency for decreased peak force and total work to
shear beef samples after 5 min of US treatment (20 kHz, 22W cm−2);
however, there was no additional effect after 10 min of treatment. Got
et al. (1999) demonstrated that ultra-structural changes can occur in
meat due to US (2.6 MHz, 10W cm−2, 15 s × 2) but this did not affect
the rate of post-mortem tenderisation.