3.2. STAI value
The average STAI values were examined to assess anxiety based on the appraisal standard and there was no difference between two groups(Table 1). However, a positive correlation was observed between the values of STAI and pre-practice sAA in the placebo-group (R = 0.742,
p = 0.014; Fig. 3a). Participants with high STAI value exhibited the high level of pre-practice sAA. In the theanine-group, a positive correlation between STAI and pre-practice sAA was similarly observed (R = 0.560, p = 0.092; Fig. 3b). The correlation coefficients between STAI
value and post-practice sAA were low in both the placebo-group