Table 2

	%SD_RR30-520	%CV_RR30-520	%TP_30-520	%VLFP_30-520	%LFP_30-520	%HFP_30-520	%nVLFP_30-520	%nLFP_30-520	%nHFP_30-520	%LHR_30-520
%HR30-520	0.009 R= -0387	0.241	0.071	0.82	0.323	<0.001 R= -0.636	0.258	0.313	0.004 R= -0.404	0.032 R=0.307
%SBP_30-520	0.326	0.293	0.362	0.8	0.217	0.901	0.737	0.25	0.18	0.149
%DBP_30-520	0.124	0.293	0.332	0.76	0.304	0.096	0.902	0.202	0.982	0.714
%MABP_30-520	0.12	0.21	0.266	0.73	0.185	0.231	0.84	0.132	0.503	0.624
%PP_30-520	0.9	0.831	0.827	0.99	0.734	0.432	0.637	0.796	0.405	0.272
%RH30-520	0.525	0.383	0.294	0.34	0.559	0.561	0.915	0.979	0.484	0.737

Table 2: The p values and Pearson correlation coefficients of linear regression between the percentage changes in heart rate, blood pressures and relative humidity of the environment and the percentage changes in HRV measures when the subjects ascended from 30 MASL to 520 MASL (n=49). HR: Heart rate; SBP: Systolic blood pressure; DBP: Diastolic blood pressure; MABP: Mean arterial blood pressure; PP: Pulse pressure; RH: Relative humidity; SD_RR: Standard deviation of RRI; CV_RR: Coefficient of variation of RRI; TP: Total power; VLFP: Very-low-frequency power; LFP: Low-frequency power; HFP: High-frequency power; nVLFP: Normalized VLFP; nLFP: Normalized LFP; nHFP: Normalized HFP; LHR: Low-/high-frequency power ratio.