. 2025 Jan 10;13(1):161. doi: 10.3390/biomedicines13010161

Table 1.

Relationship between heart rate variability and stress resistance.

Functional Metabolic Reserve	HRV Parameters				Changes in Response to Challenges	TP_ortho/ TP_sup
Functional Metabolic Reserve	TP, ms²	VLF, %	LF, %	HF, %	Changes in Response to Challenges	TP_ortho/ TP_sup
Good (preserved resistance to oxidative stress)	>3000	<20	25–35	>45	↑TP (↓ VLF, ↑↓ LF, ↑ HF)	0.5–1.5
Moderate strain (slightly reduced resistance to oxidative stress)	1700–3000	20–40	25–35	35–45	↑TP (↓ VLF, ↑↓ LF, ↑ HF)	0.5–1.5
Overstrain (low resistance to oxidative stress)	900–1500	30–65	25–35	20–30	↑↓TP (↑ VLF,↓ LF, ↓ HF)	<0.5 or >1.5
Exhaustion (very low resistance to oxidative stress)	<900	40–80	15–25	6–25	↑↓TP (↑ VLF,↓ LF, ↓ HF)	<0.5 or >1.5

Note: HF—high frequency; LF—low frequency; TP—total power; TP_ortho/TP_sup—a ratio of values of TP during the orthostatic test to the values in supine position; VLF—very low frequency; light green indicates beneficial responses; light grey indicates potentially hazardous responses.