## 4 Discussion  
The current study is the first to examine the between-session reliability of the FysioMe-ter C-station when evaluating the IMTP. It is also the first study to explore the concurrent validity of the FysioMeter C-station compared to AMTI force plates for IMTP assessment. A number of important findings were revealed. First, good relative reliability was demonstrated for CS\({}_{\text{RIGHT}}\) (ICC = 0.85), CS\({}_{\text{LEFT}}\) (ICC = 0.84) and AMTI\({}_{\text{RIGHT}}\) (ICC = 0.82), while AMTI\({}_{\text{LEFT}}\) showed an excellent relative reliability (ICC = 0.91). Second, absolute reliability was acceptable for all the measurements (CV = 6.2-7.7%). Third, when comparing the validity of the C-station to the AMTI force plates, the C-station showed a strong correlation for both right leg and left leg on day 1 and day 2 (PCC = 0.82-0.87). Fourth, the peak force was significantly higher when tested on the AMTI force plates compared to the C-station for all the conditions. The excellent reliability observed for both the AMTI platform and the C-station is consistent with the existing literature featuring the performance of unilateral (ICC = 0.95, CV = 4.91) and bilateral IMTPs (ICC = 0.96, CV = 4.61) [7, 8]. In addition, a previous study investigated the between-session reliability of the WBB when testing the isometric maximal force of the plantar flexors in a similar population, which reported excellent reliability (ICC = 0.91, SEM = 52.8 N) [28] Another study investigated the between-session reliability of the WBB when performing an isometric hamstring strength test, as well as an isometric quadriceps strength test, in a similar population, and found an excellent reliability (ICC = 0.91, CV = 7.2-8.8%) [29]. Interpreting these data together, the ICC, CV, SEM, and MDC values of the IMTP performed on the C-station in the current study appear to be in  
Figure 3: Bland–Altman plot displaying concurrent validity for (**A**) AMTI\({}_{\text{RIGHT}}\) and CS\({}_{\text{RIGHT}}\) on day 1, (**B**) AMTI\({}_{\text{LEFT}}\) and CS\({}_{\text{LEFT}}\) on day 1, (**C**) AMTI\({}_{\text{RIGHT}}\) and CS\({}_{\text{RIGHT}}\) on day 2, (**D**) AMTI\({}_{\text{LEFT}}\) and CS\({}_{\text{LEFT}}\) on day 2. PF = peak force. Dotted gray lines represent the LOA, which is \(\pm\)1.96 SD, and solid black lines represent the mean difference between peak force for C-station and peak force for AMTI force plates. accordance with several previous studies [7; 8; 28; 29], which indicates that the use of the IMTP and C-station is a reliable tool to measure lower limb isometric peak force. A significantly higher value for AMTI\({}_{\text{RIGHT}}\) on day 2 compared to day 1 was observed in the current study, which is contrary to previous research [7]. This could be attributed to a potential learning effect, given that none of the participants had any prior experience performing the IMTP [23]. However, no significant differences were observed for the other tests, which could indicate that a learning effect was not the cause of a significant increase in peak force. A way to minimize the potential learning effect that could occur is to include familiarization sessions. A study investigated the effect of familiarization sessions a minimum of 48 h before an isometric squat test. They found a significant increase in peak force production from familiarization sessions 1 and 2 to session 3, before stabilizing [30]. Based on these findings and data from the current study, we recommend that future studies should implement a familiarization session. Strong concurrent validity was observed when comparing the C-station to the AMTI force plates with a PCC analysis. Furthermore, when comparing the C-station values for CV, SEM, and MDC with the AMTI force plate values, these findings support the strong concurrent validity. This is consistent with a previous study, in which the concurrent validity of the WBB compared to an isokinetic dynamometer during the execution of isometric plantar flexion was examined in healthy university students.