Monitoring stress and allostatic load in first responders and tactical operators using heart rate variability: a systematic review

Corrigan, Sean L.; Roberts, Spencer; Warmington, Stuart; Drain, Jace; Main, Luana C.

doi:10.1186/s12889-021-11595-x

Table 4 HRV responses in repeat stressor environments and associated findings

From: Monitoring stress and allostatic load in first responders and tactical operators using heart rate variability: a systematic review

				HRV measure
Supine Assessment				Time Domain				Frequency Domain							Non-Linear		Other results
Study	Notes	N=	Timepoint of comparison	RRi	RMSSD	SDNN	PNN50	TP	VLF	LF	HF	LF n.u.	HF n.u.	LF/HF	SD1	SD2	Other results
Grant et al. [32]	20-week military training	154	12 weeks to baseline	↑	↑	↑	↑			↔	↑	↓	↑	↓	↑	↑	↑ in predicted Vo2 Max
Grant et al. [32]	20-week military training	154	20 weeks to 12 weeks	↑	↑	↑	↔			↔	↑	↔	↔	↔	↑	↔	↔ in predicted Vo2 Max
George et al. [31]	9-month basic police training	60	Post to pre	↔	↑	↑	↑	↔†		↔†	↑†			↓	↑	↔
Huovinen et al. [80]	First week of basic recruit training	24	Day 7 to day 1	↑*		↑				↑	↑	↓	↑	↔			No correlations with T:C relationship for any HRV metrics
Jouanin et al. [81]	Ranger training course	23	Post to pre	↑	↑	↑	↑	↑				↓	↑	↓			↓ plasma testosterone and body weight post course ↔ in BMI
Jouanin et al. [82]	Military mountainous training	12	Nocturnal – night 3 to night 1	↓										↓			↑ altitude sickness score on evening of day 2 compared to evening on day 1, 3 and morning on day 3 and 4
Jouanin et al. [82]	Military mountainous training	12	Post effort – control to day 2 to day 3		↔ fb ↑		↓ fb ↑	↔				↑ fb ↔	↓ fb ↔	↑ fb ↔
Nikolova et al. [83]	6-month peacekeeping mission and control group	133	Redeployment to pre-deployment	↔		↓			↔	↓	↓
			Redeployment to control	↔		↓			↓	↓	↓
			Pre-deployment to control	↔		↔			↓	↔	↔
Standing Assessment
Grant et al. [32]	20-week military training	154	12 weeks to baseline	↑	↑	↑	↑			↑	↑	↔	↔	↔	↑	↑	↑ in predicted Vo2 Max
Grant et al. [32]	20-week military training	154	20 weeks to 12 weeks	↑	↑	↑	↑			↔	↑	↔	↔	↔	↑	↔	↔ in predicted Vo2 Max
Huovinen et al. [80]	First week of basic recruit training	24	Day 7 to day 1	↑*		↔				↑	↔	↔	↔	↔			HR (r = −0.42), SDNN (r = 0.50), HF (r = 0.45) and HF n.u. (r = 0.47) correlated with T:C at day 7
Jouanin et al. [81]	Ranger training course	23	Post to pre	↑	↔	↑	↔	↔				↓	↑	↔			↓ plasma testosterone and body weight post course ↔ in BMI
Jouanin et al. [82]	Military mountainous training	12	Post effort – control to day 2 to day 3		↔		↔	↔				↔	↔	↔			↑ altitude sickness score on evening of day 2 compared to evening on day 1, 3 and morning on day 3 and 4

Participants included (n=), HRV heart rate variability, RRi R-R interval, RMSSD root mean square of successive differences, SDNN standard deviation of R-R intervals, PNN50 percentage of R-R intervals greater than 50 ms, TP total power, VLF very low frequency power, LF low frequency power, HF high frequency power, LF n.u. low frequency normative units, HF n.u. high frequency normative units, LF/HF low frequency to high frequency ratio, SD1 standard deviation of the distance of data from the line of identity on a poincairé plot, SD2 standard deviation of the distance of data perpendicular to the line of identity at the average RRi length on a poincairé plot, T:C testosterone to cortisol, BMI body mass index, heart rate (HR), derived from heart rate (*), natural log of variable (†), followed by (fb)

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ISSN: 1471-2458

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