First, we consider the power and skill assist effects with respect to energy.
Hence, an operator obtains both the power and the skill assist effects simultaneously.
Next, we must verify that the power assist effects of our system are retained, because the skill assist method is an extension of the power assist method.
The detailed analysis of the power assist effects will be discussed in another paper; here, we merely establish that the results of the skill assist method demonstrate a significant load reduction effect similar to the power assist method (Figs. 6, 7).
Though in travel, humans have never been on a spacecraft that has flown to Mars partly because the "gravitational assist" effects on the human body are not fully understood yet.
Fig. 2 Concept image of the relation between the power assist effect and the skill assist effect.
Hence, the skill assist method should have a power assist effect related to Fig. 2.
The skill assist effect is significant for subject D. Subject E also clearly shows the effect.
Finally, we can summarize the power assist effect described by (cos psi) and the skill assist effect described by (sin psi) through the phase difference (psi), as shown in Fig. 2. Specifically, for the phase difference (psi), the power assist effect- Eq. (10) is changed by (cos psi), and the skill assist effect- Eq. (11) is changed by (sin psi).
The skill assist effect is significant at (p = 0.008, (p<0.01)) with a statistical power of (83%).
The proposed skill assist method is implemented using our previous power assist device; therefore, the device provides not only a power assist effect but also a skill assist effect to correct the motion.
