比較加速度強度指標間在不同運動下之差異

Abstract

近年來，運動時強度的界定已成為大眾關心的議題，準確的監控強度不只能提升運動表現，也可能降低運動傷害發生之機率。利用加速規計算強度指標的演算法有非常多種，如：Player Load、MAD (Mean Amplitude Deviation)等，以上指標在特定運動對於強度指標間的關係已有研究證實。然而，在指標間的差異與適用運動尚未有統整性的討論。目的：在不同運動下，利用加速規不同方法計算運動強度，比較指標間的差異。方法：招募15位受試者，配戴胸帶式心率帶於胸前與九軸IMU (Naxsen 9X, SIPPLink, Taiwan)放置於左手手腕、軀幹及右腳脛骨。收取羽球操（米字步）、跑步、籃球操（防守動作、投籃、跳耀等）三項運動試驗下的心率與加速度數據，加速度以10Hz低通濾波後，計算Player Load、MAD。以重複量數單因子變異數分析 比較不同強度下心率之差異，再以皮爾森積差相關分析加速度指標與心率間的相關性。結果：羽球試驗中兩項指標皆為放置於手部的加速度與心率有較高的相關性，跑步放置於手部的PL數值與心率有較高的相關性，籃球試驗中，兩種指標在三種放置位置下與心率都有高度的相關。結論：羽球與跑步兩種運動的加速規最佳放置位置為手部，籃球運動則不論部位，兩種指標皆適合使用。本實驗也發現，不管是Player Load或是MAD都需要放置於加速規數據變化較明顯之位置，才能使強度監控上有更準確的數據，未來在監控運動的選擇上，若要使用Player Load或MAD，該運動包含更多樣且動作較大的動作會是較適合之選擇。In recent years, the definition of intensity during exercise has become a high attention. Accurate monitoring of intensity not only improves sport performance but also reduces the probability of sport injuries. There are many methods for calculating the intensity index by the accelerator, such as Player Load and MAD (Mean Amplitude Deviation). The relation between these indexes in specific exercises and the exercise intensity has been confirmed by several reports. However, the differences between indexes and the applicable exercises have not been systematically discussed. Object: Different methods of accelerometer signal were used to calculate exercise intensity for different sports and compare the differences between indexes. Methods: Fifteen subjects were recruited, wearing a chest strap heart rate monitor on the chest and placing nine-axis IMUs (Naxsen 9X, SIPPLink, Taiwan) on the left wrist, trunk and right tibia. The heart rate and acceleration data under running, basketball exercises (shuttle running, and jumping) and badminton exercises (six-point footwork) were collected. After filtering the acceleration by 10Hz low-pass filter, the Player Load and the MAD were calculated. The difference of heart rate was analyzed under different exercise intensities test via repeated measured ANOVA, and the correlation coefficient between the heart rate and the acceleration intensity indexes were found out by using the Pearson product difference correlation. Results: In the badminton test, both indicators show that the accelerometer, which placed on hands, has a higher correlation with the heart rate; in the running test, the Player Load value placed on the hand has a higher correlation with the heart rate; in the basketball test, the two indicators for all the three placements are highly correlated with heart rate. Conclusion: The best placement of the acceleration for both badminton and running are on hands. Both indicators for basketball are suitable no matter where the accelerometer place. In this study, it also found that whether Player Load or MAD needs to be placed in a position with higher acceleration value to make more accurate intensity monitoring. In the future, choosing sport with more diverse and larger movement would be better in case of using PL or MAD as monitoring indicators.