Soga Toshiaki, Yamaguchi Shota, Inami Takayuki, Saito Hiromi, Hakariya Nadaka, Nakaichi Naoto, Shinohara Sho, Akiyama Kei, Hirose Norikazu
Graduate School of Sport Sciences Waseda University.
Institute of Physical Education Keio University.
Int J Sports Phys Ther. 2023 Aug 1;18(4):917-922. doi: 10.26603/001c.83936. eCollection 2023.
A recently developed smartphone application (Nordic Angle) allows the automatic calculation of the break-point angle (BPA) during Nordic hamstring exercise (NHE) without transferring the collected data to a computer. The BPA is the point at which the hamstrings are unable to withstand force. However, the validity of the BPA values obtained by this method has not been examined.
HYPOTHESIS/PURPOSE: This study aimed to evaluate the validity and reliability of the Nordic Angle by comparing the BPA values of the Nordic Angle with those of two-dimensional motion analysis software that can calculate the angles and angular velocities of various joints.
Cohort assessing Validity and Reliability.
The validity of the Nordic Angle BPA data was verified by Spearman's correlation test for consistency with the movement analysis data, and the magnitude of the correlation was indicated by rs. The agreement between these measurements was examined using the Bland-Altman analysis. The reliability of the Nordic Angle and motion analysis was examined using the intraclass correlation coefficient (ICC) (1,k) based on data from repeated trials within a day.
Although the spearman correlation between the Nordic angle and the angle determined using motion analysis did not reach statistical significance (p = 0.052), a very large correlation was present (rs = 0.75). The difference between the mean values of the Nordic Angle and motion analysis was 0.4 ± 2.1°, and the limits of agreement ranged from -3.9° to 4.6°. In two BPA measurements, the Nordic Angle showed perfect reliability (ICC = 1.00, p < 0.001), while motion analysis showed nearly perfect reliability (ICC = 0.97, p < 0.001).
The Nordic Angle, which has both validity and reliability, may be appropriate for field measurement because it allows immediate feedback of BPA and the measurement of many athletes.
3b©The Author(s).
最近开发的一款智能手机应用程序（北欧角度）可在北欧腿弯举练习（NHE）期间自动计算断点角度（BPA），且无需将收集的数据传输至计算机。断点角度是指腘绳肌无法承受力量的点。然而，通过这种方法获得的BPA值的有效性尚未得到检验。
假设/目的：本研究旨在通过比较北欧角度的BPA值与可计算各关节角度和角速度的二维运动分析软件的BPA值，评估北欧角度的有效性和可靠性。
评估有效性和可靠性的队列研究。
通过Spearman相关性检验验证北欧角度BPA数据与运动分析数据一致性的有效性，相关性大小用rs表示。使用Bland-Altman分析检查这些测量值之间的一致性。基于一天内重复试验的数据，使用组内相关系数（ICC）（1，k）检查北欧角度和运动分析的可靠性。
尽管北欧角度与使用运动分析确定的角度之间的Spearman相关性未达到统计学显著性（p = 0.052），但存在非常大的相关性（rs = 0.75）。北欧角度和运动分析平均值之间的差异为0.4±2.1°，一致性界限范围为-3.9°至4.6°。在两次BPA测量中，北欧角度显示出完美的可靠性（ICC = 1.00，p < 0.001），而运动分析显示出几乎完美的可靠性（ICC = 0.97，p < 0.001）。
北欧角度具有有效性和可靠性，可能适用于现场测量，因为它可提供BPA的即时反馈并能对众多运动员进行测量。
3b©作者。
