###### Abstract  
This study aimed to assess the validity and reliability of a commercially available inertial measurement unit (Enode) for measuring barbell kinematics and kinetics during a snatch. In order to assess validity and within- and between-session reliability, thirteen competitive weightlifters conducted two snatches on two separate occasions at 85% of their one-repetition maximum. The Enode sensor was attached to the barbell, with each lift recorded via the device's native application concurrently with an 11-camera motion capture system. Passing-Bablok regression indicated fixed and proportional bias in some horizontal measures of barbell mechanics but showed no bias in all but one vertical variable. Collectively, this suggests that the Enode is a valid tool in the measurement of vertically derived, but not horizontally derived, variables from barbell kinematics. Within- and between-session reliability showed moderate to excellent ICCs, with trivial to small differences between repetitions and between sessions. However, between-session reliability showed lower levels of variability and, thus, may help coaches identify changes in technique over time (between sessions) with good accuracy. Overall the Enode offers a practical and affordable option for coaches seeking to monitor weightlifting technique in training environments.  
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Footnote †: journal: Applied sciences  
article  
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The assessment of barbell mechanics is frequently realized using video analysis, with a large proportion of research using this as their primary method [1; 11; 12; 13; 14]. While this method of data capture is highly applicable it may require multiple cameras or specialist software, often reducing accessibility to coaches. It is for this reason, along with the enhancement of technology, that alternative devices (e.g., inertial measurement units [IMU]) have become increasingly popular. For application within weightlifting, the over-the-counter IMU-based Enode (formerly known as VmaxPro) (Blaumann & Meyer, Sports Technology UG, Magdeburg, Germany) is an easy-to-administer system to measure time series barbell kinematics instantaneously, providing clear, accessible information for the coach and lifter. Additionally, it is also able to synchronize the sensor data to a hand-held tablet, providing the user with simultaneous video feedback. The Enode system has previously been investigated for its validity in various strength-based exercises when assessing measures of average velocity, showing high levels of agreement with a three-dimensional (3D) motion capture (mean difference: \(-\)0.014 [95% CI \(-\)0.057-0.029], r\({}^{2}\) = 0.99) [20]. This is further supported by [PERSON], [PERSON], and [PERSON] [21], who found near perfect correlations between the Vmax Pro and 3D motion capture for mean and peak velocity, with a standard error of estimates between 2.4 and 6.8% (\(r\) = 0.99 [0.94-0.96] and 0.99 [0.92-0.99], respectively) across five different exercises, including both strength and ballistic type movements. While this provides some insight into the utility of the Enode to measure mean and peak velocity during general training exercises, its usefulness to analyze barbell mechanics in weightlifting has not yet been investigated. Therefore, the aim of this investigation is two-fold; (1) to assess the validity of the Enode relative to 3D motion capture criterion, and (2) to identify the within and between day reliability of various vertical and horizontal kinematic and kinetic barbell measures. It was hypothesized that the Enode would show good level of concurrent validity for barbell kinematic and kinetic data relative to the 3D motion capture system. Additionally, we also hypothesized that the Enode system would show acceptable within and between session reliability of barbell kinematic data.