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. 2021 Apr 20;7(4):e06844. doi: 10.1016/j.heliyon.2021.e06844

Figure 1.

Figure 1

Examples of the time-series HR data during one match. A match consisted of 5–9 games and continued for 11–30 min. The longest match consisted of 9 games and continued for 30 min (A) and the shortest match consisted of 5 games and continued for 11 min (B). A game consisted of 2 or 3 rounds and continued for 3–5 min. The blue and orange lines show examples of normalized HR signals from two opponents. The vertical axis indicates the HR [BPM]. We calculated the normalized mean HR for each of the 1st and final rounds for the 1st, 2nd, middle, and final games. For example, the middle games consisted of the 3rd to 8th (A) and 3rd to 4th games (B). The final game was the 9th game (A) and the 5th game (B). Then, we calculated the correlation of the normalized HR.