研究目的：探讨分析GT3X＋测量成年男、女走、跑运动能耗时加速度计基本参数的特征及其与能耗之间的相关性。研究方法：采用K4b2便携式气体代谢分析仪和ActiGraPh GT3X＋同步监测51名20～30岁成年受试者（男25名，女26名），依次完成3．0km／h、4．5km／h、4．5km／h加10％坡度、6．0km／h和7．5km／h跑台走、跑运动。结果：1）无论男、女，随着走、跑速度的增加，VM、VT活动计数均逐渐增大；AP活动计数在3～6km／h之间逐渐增大，至7．5km／h时出现明显下降。2）与VT、AP不同，4．5km／h加10％坡度行走时，ML活动计数大于6．0km／h快走。3）无论男、女，在3km／h慢走时，HV活动计数明显大于VT，而其他速度下，VT活动计数均大于HV（P＜0．01）。4）女性AP活动计数明显大于男性，VT、ML（3km／h除外）、VM男、女之间无明显差异。5）VM与其他参数的相关性由高到低依次为VT、HV、ML和AP，特别是VM与VT高度相关（r＝0．983，P＜0．01）。6）EE（k4b2）与VT、VM相关性较高，而与AP、ML相关性很低。结论：在跑台走、跑运动时（3km／h除外），3个轴加速度活动计数变化最明显的是VT。由快走转至跑步运动形式时VT增幅最大，AP出现下降；ML是感应跑台是否有坡度的主要参数之一；一定速度范围内，VT和VM均为推算走、跑运动能耗的最佳自变量，但以VT为自变量的能耗方程预测水平基本可以满足无坡度走跑运动能耗测量的需要。%Objective :To investigate the characteristic of GT 3X+ accelerometer’s basic parame‐ters and the correlation between the parameters and energy expenditure during treadmill walk‐ing and running in adult men and women .Methods :A total of 51 participants (25 men, 26 women, ages at 20~30 yrs ) performed five 5‐min treadmill walking/running tests (3 .0 km/h, 4 .5km/h, 4 .5km/h at 10% grade, 6km/h, 7 .5km/h ) .Results :1 ) In both subject groups, along with the increase of speed, VM, VT activity counts gradually increased .AP ac‐tivity counts increased gradually from 3km/h to 6km/h, but decreased significantly in 7 .5km/h .2) Unlike other parameters, ML activity counts in 4 .5km/h plus 10% grade walking were greater than 6km/h walking .3) VT activity counts were greater than HV In all speed except 3 km/h (P< 0 .01) .4) AP activity counts were greater in female than in male, but there was no significant difference about VM, VT, ML (except 3 km/h) between the two subject groups . 5) The correlation of VM and other parameters from high to low were VT, HV, ML, AP, and VM was highly correlated with VT (r=0 .983, P<0 .01) .6) EE(k4b2) were highly correla‐ted with VT and VM, but lowly with AP and ML .Conclusions :During walking and running on the treadmill (except 3 .0 km/h), VT activity count was the maximum in the three accelerate vector .From walking to running, the largest increase occurred in VT, but AP decreased .ML was one of the main parameters to induce whether the slope existed on the treadmill .In a cer‐tain speed range, VT and VM were both the best argument for the calculation of energy ex‐penditure on the treadmill, but VT could meet the need to predict energy expenditure .
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