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Table 3 Results of the systematic research

From: Objective assessment of mental stress in individuals with different levels of effort reward imbalance or overcommitment using heart rate variability: a systematic review

Author, year

Country, profession

Characteristics of subjects

Method

Outcome and measurement of HRV

STARD HRV

   

ERI/OC

HRV

  

Using ERI

 Borchini, 2015 [26]

Italy, nurses

n=53

SLS n=36, RHS n=7, PHS n=10

Women: SLS 79%, RHS 86%, PHS 90%

Age: SLS 37.2±1.9 years, RHS 40.3±2.8 years, PHS 41.0±4.1 years

Healthy

SLS=ERI 0.5±0.2

RHS=ERI 1.1±0.4

PHS=ERI 1.7±0.6

24-h ECG

Holter

Between

WD, RD

Day, night

WD: SDNN: SLS>RHS>PHS*; SDNN_Index: SLS>RHS>PHS*; SDANN: SLS>RHS>PHS; RMSSD: SLS>RHS>PHS; pNN50: SLS>RHS>PHS.

RD: SDNN: SLS>RHS>PHS; SDNN_Index: SLS>RHS>PHS; SDANN: SLS>RHS>PHS; RMSSD: RHS>SLS>PHS; pNN50: SLS>RHS>PHS

16

 Borchini, 2018 [27]

Italy, nurses

WD_working: HF: SLS>RHS>PHS*; LF: SLS>RHS>PHS*, LF/HF: RHS>SLS>PHS.

WD_non-working: HF: SLS>RHS>PHS; LF: SLS>RHS>PHS*; LF/HF: SLS=RHS>PHS.

WD_night: HF: SLS>RHS>PHS; LF: SLS>PHS>RHS; LF/HF: PHS>SLS>RHS.

RD_day: HF: SLS>RHS>PHS; LF: SLS>RHS>PHS*, LF/HF: SLS>RHS>PHS.

RD_night: HF: SLS>RHS>PHS; LF: SLS>RHS>PHS; LF/HF: SLS=PHS>RHS

19.5

 Jarczok, 2016 [28]

Germany, employees (sec./tert. sector)

n = 9.937 (women: 18.2%)

Age 41.2 ±10.6 years

Not reported for diseases, medication, online questionnaire

ERI 1.2±0.5

Distinct mediation models

Structural equation

24-h ECG

Chest belt

Between

ERI neg. associated RMSSD (↓) at day and night

15

 Loerbroks, 2010 [29]

Germany, employees (airplane manufacturer)

N=581 (women 11.5%)

AG I n=159, AG II n=158, AG III n=183, AG IV n=81

Age range [years]: AGI I 17–34, II 35–44, III 45–54, IV 55–65

Age groups

ERI as coefficient

24-h ECG

Holter

Between

ERI neg. associated with RMSSD (↓) over WD, not during sleep

Most pronounced in workers aged 35–44 years

Effect of age

17

Using OC

 Darius, 2021 [25]

Germany, kindergarten teachers

n = 163 (100% women)

Age 45.5±12.4 years

healthy

OC high/low

Cut off ≥ 18

24-h ECG (Holter)

24 h, 6 h day, 6 h night

Between

24h: OC high: ↓ RMSSD*, pNN50*, SDNN, HF; ↑ LF, LF/HF

Day: OC high: ↓ pNN50, SDNN, HF; ↔ RMSSD, LF/HF, ↑ LF

Night: OC high: ↓ RMSSD*, pNN50*, SDNN*, HF; ↑ LF, LF/HF

Effect of age: LF, HF in night, not effect of work experience

16

  1. HRV parameter time domain—SDNN (standard deviation of all normal-to-normal R-R intervals), SDNN_ Index (mean of the 5-min standard deviation of the NN interval), SDANN (standard deviation of the average of NN intervals in 5-min segments), RMSSD (root mean square of successive differences of R-R intervals, pNN50 (percentage of successive NN intervals that differ by more than 50 ms); frequency domain—LF (low frequency power, 0.04–0.15 Hz), HF (high frequency power, 0.15–0.4 Hz), LF/HF-ratio
  2. Between between-subject design, ERI effort reward imbalance ratio, OC overcommitment. Significant p values are marked with asterisks (* for p<0.05). SLS stable low strain, RHS recently high strain, PHS prolonged high strain, WD working day, RD resting day, AG age groups