RT - Journal Article T1 - Pilot Application of Biofeedback Training Program for Racket Sports Players JF - Ann.-Appl.-Sport-Sci. YR - 2020 JO - Ann.-Appl.-Sport-Sci. VO - 8 IS - 4 UR - http://aassjournal.com/article-1-898-en.html SP - 0 EP - 0 K1 - Heart Rate Variability K1 - Biofeedback Training K1 - Sport Performance AB - Background. A biofeedback program receives attention as an intervention program for athletes to regulate their psychological state. Objectives. The purpose was to apply for a heart rate variability (HRV) biofeedback training program and validate its effectiveness for racket sports players. Methods. The participants were eight elite sport athletes (three men and five women): five squash players and three tennis players. The HRV biofeedback training program consisted of ten sessions in which the participants performed paced breathing for 10 minutes (e.g., 5-second inspiration and 5-second expiration). The means and standard deviations of the collected data were calculated, and the Wilcoxon signed-rank test was performed using SPSS windows 18.0. Results. Changes in HRV by the biofeedback training were significant. Standard Deviation of Normal to Normal (SDNN; Z = -2.38, p = 0.017) in time domain and Low Frequency (LF, Z = -2.52, p = 0.12) and the ratio of LF to High Frequency (HF; Z = -2.52, p = 0.12) in frequency domain were increased. Conclusion. The present study provides empirical results needed to expand HRV biofeedback training research for the performance enhancement program of athletes. LA eng UL http://aassjournal.com/article-1-898-en.html M3 10.29252/aassjournal.898 ER -