Effects of Whole-Body Vibration on Heart Rate Variability During Post-Exercise Recovery (WBV-HRV)

Participants assigned to Sequence AB will undergo whole-body vibration (WBV) recovery during the first experimental period, followed by passive recovery during the second period. A seven-day washout period will separate the two sessions. Both recovery interventions will last 15 minutes and will be performed in a seated position following the Yo-Yo Intermittent Recovery Test Level 1. During WBV recovery, participants will remain seated with their feet placed on the vibration platform, operating at 35 Hz and 2 mm peak-to-peak amplitude.

Participants assigned to the whole-body vibration (WBV) intervention will undergo a 15-minute recovery session immediately following the Yo-Yo Intermittent Recovery Test Level 1. During the intervention, participants will remain seated on a chair with their knees flexed at approximately 90 degrees and their bare feet placed on a vertical vibration platform. The platform will operate at a frequency of 35 Hz and a peak-to-peak amplitude of 2 mm. Heart rate variability will be continuously recorded throughout the 15-minute recovery period to evaluate autonomic nervous system responses.

Participants assigned to the passive recovery intervention will undergo a 15-minute seated recovery session immediately following the Yo-Yo Intermittent Recovery Test Level 1. During this period, participants will remain seated on a chair with their feet resting on the floor, without receiving whole-body vibration or any other active recovery intervention. Heart rate variability will be continuously recorded throughout the 15-minute recovery period to evaluate autonomic nervous system responses.

Participants assigned to Sequence BA will undergo passive recovery during the first experimental period, followed by whole-body vibration (WBV) recovery during the second period. A seven-day washout period will separate the two sessions. Both recovery interventions will last 15 minutes and will be performed in a seated position following the Yo-Yo Intermittent Recovery Test Level 1. During passive recovery, participants will remain seated with their feet resting on the floor. During WBV recovery, participants will remain seated with their feet placed on the vibration platform, operating at 35 Hz and 2 mm peak-to-peak amplitude.

Participants assigned to the whole-body vibration (WBV) intervention will undergo a 15-minute recovery session immediately following the Yo-Yo Intermittent Recovery Test Level 1. During the intervention, participants will remain seated on a chair with their knees flexed at approximately 90 degrees and their bare feet placed on a vertical vibration platform. The platform will operate at a frequency of 35 Hz and a peak-to-peak amplitude of 2 mm. Heart rate variability will be continuously recorded throughout the 15-minute recovery period to evaluate autonomic nervous system responses.

Participants assigned to the passive recovery intervention will undergo a 15-minute seated recovery session immediately following the Yo-Yo Intermittent Recovery Test Level 1. During this period, participants will remain seated on a chair with their feet resting on the floor, without receiving whole-body vibration or any other active recovery intervention. Heart rate variability will be continuously recorded throughout the 15-minute recovery period to evaluate autonomic nervous system responses.

Very low frequency (VLF) power is a frequency-domain parameter of heart rate variability (HRV), expressed in ms². HRV will be continuously recorded using a Polar H10 chest strap during the entire exercise test and the 15-minute recovery period. VLF power will be analyzed using Kubios HRV software to assess autonomic responses under whole-body vibration and passive recovery conditions.

Low frequency (LF) power is a frequency-domain parameter of heart rate variability (HRV), expressed in ms². HRV will be continuously recorded using a Polar H10 chest strap during the entire exercise test and the 15-minute recovery period. LF power will be analyzed using Kubios HRV software to evaluate autonomic responses under whole-body vibration and passive recovery conditions.

High frequency (HF) power is a frequency-domain parameter of heart rate variability (HRV), expressed in ms², and is commonly used as an indicator of cardiac parasympathetic modulation. HRV will be continuously recorded using a Polar H10 chest strap during the entire exercise test and the 15-minute recovery period. HF power will be analyzed using Kubios HRV software to compare responses between whole-body vibration and passive recovery conditions.