Sallé H J, Verberk M M, Kemper C M
Am Ind Hyg Assoc J. 1986 Sep;47(9):563-6. doi: 10.1080/15298668691390241.
The effect of three kinds of moderate physical loads on the tremor of the middle finger was studied in eight males: cycling 15 min on an ergometer at a heart rate of 140 beats/min (general dynamic load); lifting a mass of 1 kg by the middle finger at a rate of 30 times/min for 5 min (local dynamic load); and carrying in each hand a 15 kg mass for 5 min. Few effects were observed: 10% decrease of RMS acceleration after local dynamic load and some changes in the power spectrum after general dynamic load. It is concluded that the effect of recent, short time physical load of moderate extent can be neglected as a disturbing factor in the study of the effects of toxic exposure on postural tremor. The inter- and intra-individual variation (over 4 weeks) in nine males and nine females also was studied. The intra-individual variation ranged from 4% for the mean frequency to 35% for the 0-4 Hz band of the power spectrum. The inter-individual variation ranged from 8% for the mean frequency to more than 60% for some frequency bands of the power spectrum. It is concluded that the mean frequency possibly is a sensitive parameter in epidemiologic studies on effects of external toxic exposure on tremor.
在测力计上以每分钟140次心跳的速度骑行15分钟（一般动态负荷）；用中指以每分钟30次的速度提起1千克重物，持续5分钟（局部动态负荷）；以及双手各提15千克重物，持续5分钟。观察到的影响很小：局部动态负荷后均方根加速度下降10%，一般动态负荷后功率谱有一些变化。得出结论，在研究有毒暴露对姿势性震颤的影响时，近期、短时间的适度体力负荷作为干扰因素的影响可以忽略不计。还研究了九名男性和九名女性在四周内的个体间和个体内差异。个体内差异范围从平均频率的4%到功率谱0 - 4Hz频段的35%。个体间差异范围从平均频率的8%到功率谱某些频段的6%以上。得出结论，平均频率可能是关于外部有毒暴露对震颤影响的流行病学研究中的一个敏感参数。
