The Effect of Training Load Regulation Based on Heart Rate Variability Using Wearable Devices on Heart Rate Variability and Estimated Maximal Oxygen Uptake in Weightlifters

This study aimed to test the effectiveness of a training program according to regulated training load using heart rate variability readings (HRV) and estimated VO₂max in weightlifters. The researcher employed an experimental

Design: with two equivalent groups (experimental and control) using pre- and post-tests as this

Method: was appropriate for the nature of the problem and the research

Objectives: . The research population included of weightlifters at the Police Sports Club during the 2026 sports season totaling 12 athletes. The research sample comprised 10 athletes choose purposively and randomly assigned to two equivalent groups: five athletes in the experimental group and five in the control group. Two athletes were used for a pilot study. The research instruments included a Polar H10 device and the Kubios HRV software for measuring heart rate variabilit, as well as a 12-minute Cooper test for estimating VO₂max. The main trial lasted for eight weeks, comprising 24 training sessions. The experimental group adjusted their training load based on heart rate variability readings while the control group continued with the traditional training program. Statistical analysis using SPSS demonstrated improvements in both heart rate variability (from 34.80 to 48.60 ms) and the estimated maximum oxygen consumption (from 45.72 to 52.18 ml/kg/min) in the experimental group demonstrating statistically significant superiority over the control group (38.10 ms and 47.80 ml/kg/min, respectively) in the post-tests. The researcher determined that adjusting training load based on heart rate variability readings using wearable devices is an effective

method for developing recovery, functional adaptation and the development of important physiological indicators in weightlifters.