身體不同位置加速度分析跑步機跑步身體活動量之硏究

Acceleration on different body positions toestimate energy expenditure during running on atreadmill

前言：許多體適能指標使用攝氧量、心跳來評估身體活動量，但這些測量方式需要昂貴的器材。本硏究利用跑步時身體不同位置產生之加速度與心跳作比較，証實一個更方便的身體活動量測量方法。方法：十五位男性實驗參與者將三個三軸加速規分別置於左手手腕、軀幹（下背）、左腳腳踝，然後依序在4、6、8、10、12、14、16km-hr-1的速度下進行跑步，實驗參與者在每個速度下心跳達穩定後繼續跑步30秒，比較不同部位各軸加速度、各平面加速度、總和加速度和心跳率之間的相關性，以及重覆量測單因子變異數分析不同部位各軸加速度、各平面加速度、總和加速度在不同跑步速度之差異性。結果：（一）跑步時手部擺動產生的加速度與心跳有顯著相關（r=817)。（二）三軸加速規所測得的手腕前後軸（Y)、矢狀面（Y-Z)加速度可預估跑步時的身體活動量。討論：手腕加速度積分値的高相關性，以及在前後軸（Y)、矢狀面（Y-Z)的顯著差異，證明了跑步時手臂前後擺動產生的加速度適合代表身體活動量。結論與建議：以上的訊息有助於未來發展一個方便又準確評估身體活動量的裝置，可以使用單軸加速規與手錶結合，降低生產成本。

Background: Many fitness index used VO2max and heart rate to estimate energy expenditure， butthese current methods require expensive equipment for the direct measurement. This study tried todetermine a more convenient way to estimate energy expenditure by comparing the relationship ofheart rate with acceleration on different positions while running on a treadmill. Method: Fifteenmales wore three tri-axial accelerometers， and the placements of accelerometers were left wrist，trunk (low back) and left ankle. Each participant ran 30 sec at 4， 6， 8， 10， 12， 14， 16 km·h-1 afterthey keep stable heart rate in these speeds. Comparing correlation of heart rate with acceleration ofdifferent axes， different planes and total acceleration by Pearson product-moment correlation.Comparing difference of different placements with acceleration of different axes， different planesand total acceleration by repeated measured one-way ANOVA. Results: (1) The total accelerationon wrist is significantly correlated with heart rate in this study. (2) The acceleration of Y-axis andsagittal plane of wrist indicated that wrist is a good placement to estimate energy expenditureduring running on a treadmill. As total acceleration of wrist have high correlation with heart rate，and significant difference in Y-axis and sagittal plane of wrist indicated that wrist is a goodplacement to estimate energy expenditure during running on a treadmill. Conclusion: Allinformation is very useful to develop a new device to accurately estimate energy expenditure usingwatch which is more convenient compare to current devices in the market.