Calculation of approximate heart rate variability indicators based on low-resolution heart rate data provided by widely used commercially available wearable devices. - Xue Li; Goh Onoguchi; Hiroshi Komatsu; Chiaki Ono; Noriko Warita; Zhiqian Yu; Atsuko Nagaoka; Sho Horikoshi; Kenji Iwabuchi; Kohei Fuji; Mizuki Hino; Yuta Takahashi; et al. (Biomed. Signal Process. Control., 2026)