η2 = 0.080 ), whereas no significant difference was detected in the pairwise comparison . The HH revealed a significant main effect on amplitude scaling in SBT ( F ( 3 , 38 ) = 7.004 , p < 0.001 , η2 = 0.163 ), MBT ( F ( 3 , 38 ) = 3.630 , p = 0.015 , η2 = 0.092 ), SFT ( F ( 3 , 38 ) = 15.604 , p < 0.001 , η2 = 0.302 ), MFT ( F ( 3 , 38 ) = 24.919 , p < 0.001 , η2 = 0.409 ), and LFT ( F ( 3 , 38 ) = 9.522 , p < 0.001 , η2 = 0.209 ). No significant main effect was investigated for HHS wearing experience on amplitude scaling in six perturbing conditions . In MFT , the amplitude scaling was significantly higher when HH increased to seven cm compared with flat shoes among experienced wearers ( p = 0.013 , 95 % CI [ −2.193 – 0.207 ]). table 5

Notes . COG : center of gravity

*

Inexperienced vs . experienced HHS wearers , p < 0.05 .

LOS

As shown in Table 5 , no statistically significant interaction was found between the HH and HHS wearing experience on COG movement velocity , whereas the two-way interaction was significant on directional control ( F ( 3 , 38 ) = 7.790 , p < 0.001 , η2 = 0.166 ). The main effect of HH was significant for COG movement velocity ( F ( 3 , 38 ) = 20.770 , p < 0.001 , η2 = 0.347 ) and directional control ( F ( 3 , 38 ) = 75.478 , p < 0.001 , η2 = 0.659 ). The significant main effect of wearing experience was also determined for directional control ( F ( 1 , 40 ) = 5.114 , p = 0.029 , η2 = 0.116 ). The results of post hoc analysis showed that COG movement velocity decreased significantly when wearing 3.9 cm HHS compared with 10.1 cm HHS among experienced wearers ( p = 0.001 , 95 % CI [ 0.310 °/ s – 1.480 °/ s ]). Experienced HHS wearers exhibited significantly higher COG directional control than inexperienced wearers when wearing 10.1 cm HHS ( t = -3.391 , p = 0.002 ).

Functional mobility

Table 6 illustrates that the two-way interaction ( HH * wearing experience ) was significant for FRT distance ( F ( 3 , 38 ) = 3.858 , p = 0.016 , η2 = 0.090 ) and TUGT time ( F ( 3 , 38 ) = 9.883 , p < 0.001 , η2 = 0.202 ). The main effect of HH was significant for FRT distance ( F ( 3 , 38 ) = 94.859 , p < 0.001 , η2 = 0.709 ) and TUGT time ( F ( 3 , 38 ) = 127.372 , p < 0.001 , η2 = 0.766 ). Significant main effect of wearing experience was also determined for FRT distance ( F ( 1 , 40 ) = 10.840 , p = 0.002 , η2 = 0.217 ) and TUGT time ( F ( 1 , 40 ) = 10.639 , p = 0.0021 , η2 = 0.214 ). With respect to the results of the pairwise comparison , generally , functional mobility decreased as HH increased . FRT distance was significantly shorter in 10.1 HHS than in flat shoes ( p < 0.001 , 95 % CI = 3.170 – 8.973 cm ), 3.9 cm ( p < 0.001 , 95 % CI [ 4.254 – 8.146 ] cm ), and seven cm HHS ( p < 0.001 , 95 % CI [ 2.675 – 6.225 ] cm ) among

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