Damji Faraz, MacDonald Kerry, Hunt Michael A, Taunton Jack, Scott Alex
Centre for Hip Health and Mobility, Vancouver Coastal Health Research Institute, Vancouver, British Columbia, Canada.
Department of Physical Therapy, Faculty of Medicine, University of British Columbia, Vancouver, British Columbia, Canada.
PLoS One. 2021 Jan 22;16(1):e0245299. doi: 10.1371/journal.pone.0245299. eCollection 2021.
Sport is becoming increasingly competitive and athletes are being exposed to greater physical demands, leaving them prone to injuries. Monitoring athletes with the use of wearable technology could provide a way to potentially manage training and competition loads and reduce injuries. One such technology is the VERT inertial measurement unit, a commercially available discrete wearable device containing a 3-axis accelerometer, 3-axis gyroscope and 3-axis magnetometer. Some of the main measurement outputs include jump count, jump height and landing impacts. While several studies have examined the accuracy of the VERT's measures of jump height and jump count, landing impact force has not yet been investigated. The objective of this research study was to explore the validity of the VERT landing impact values. We hypothesized that the absolute peak VERT acceleration values during a jump-land cycle would fall within 10% of the peak acceleration values derived simultaneously from a research-grade accelerometer (Shimmer). Fourteen elite university-level volleyball players each performed 10 jumps while wearing both devices simultaneously. The results showed that VERT peak accelerations were variable (limits of agreement of -84.13% and 52.37%) and had a propensity to be lower (mean bias of -15.88%) when compared to the Shimmer. In conclusion, the validity of the VERT device's landing impact values are generally poor, when compared to the Shimmer.
体育竞技性日益增强，运动员面临着更大的身体负荷，因而更容易受伤。利用可穿戴技术对运动员进行监测，可能为管理训练和比赛负荷以及减少受伤提供一种方法。VERT惯性测量单元就是这样一种技术，它是一种市售的独立可穿戴设备，包含一个三轴加速度计、一个三轴陀螺仪和一个三轴磁力计。一些主要的测量输出包括跳跃次数、跳跃高度和落地冲击力。虽然已有多项研究检验了VERT测量跳跃高度和跳跃次数的准确性，但落地冲击力尚未得到研究。本研究的目的是探讨VERT落地冲击值的有效性。我们假设在跳跃-落地周期中VERT的绝对峰值加速度值将落在同时由研究级加速度计（Shimmer）得出的峰值加速度值的10%以内。14名精英大学水平的排球运动员在同时佩戴这两种设备的情况下各进行了10次跳跃。结果显示，与Shimmer相比，VERT的峰值加速度具有变异性（一致性界限为-84.13%和52.37%），且有偏低的倾向（平均偏差为-15.88%）。总之，与Shimmer相比，VERT设备的落地冲击值的有效性总体较差。
