There were no differences in mean LH ( normal : 3.2 0.4 vs disrupted : 3.2 0.5 IU/L ) , LH pulse frequency ( 0.6 0.06 vs 0.6 0.07 pulses/h ) , or LH pulse amplitude ( 2.8 0.4 vs 2.8 0.4 IU/L ) between the two nights .