Table 2 Descriptive measures (mean ± standard deviation, median; 95% confidence interval) and the difference between students and office workers concerning time per day of activities ≥50% heart rate reserve, the percentage of time compared to total waking wearing time in heart rate reserve zones ≥50%, and the percentage of assigned incidental lifestyle physical activity compared to assigned structured PA in heart rate reserve zones ≥50%

Daily time in Zone 50–100% HRR [min]

31.86 ± 27.1

27.1

[20.14; 43.58]

22.84 ± 14.05

23

[13.40; 32.38]

40.13 ± 33.66

28.36

[18.74; 61.51]

−.92

.38

Daily time in Zone 50–60% HRR [min]

21.87 ± 17.15

15.57

[14.45; 29.28]

16.85 ± 10.93

15.57

[9.51; 24.19]

26.47 ± 20.76

16.47

[13.28; 39.66]

−.86

.41

Daily time in Zone 60–70% HRR [min]

5.08 ± 5.21

4.58

[2.82; 7.33]

3.80 ± 2.95

4.58

[1.82; 5.78]

6.24 ± 6.58

4.66

[2.07; 10.42]

−.86

.41

Daily time in Zone 70–80% HRR [min]

2.79 ± 5.71

0.78

[0.32; 5.26]

1.73 ± 2.17

0.74

[0.28; 3.19]

3.77 ± 7.67

1.25

[− 1.10; 8.64]

−.59

.57

Daily time in Zone 80–90% HRR [min]

1.21 ± 1.97

0.4

[0.35; 2.06]

0.43 ± 0.90

0

[− 0.17; 1.04]

1.91 ± 2.43

1.04

[0.37; 3.46]

−2.2

.03

Daily time in Zone 90–100% HRR [min]

0.92 ± 2.0

0

[0.05; 1.78]

0.03 ± 0.61

0

[− 0.02; 0.07]

1.73 ± 2.54

0.22

[0.12; 3.35]

−2.69

.01*

Percentage of waking time per day in Zone 50–100% HRR [%]

3.87 ± 3.22

3.34

[2.48; 5.26]

2.91 ± 1.71

3.33

[1.76; 4.06]

4.74 ± 4.03

3.34

[2.18; 7.31]

−.62

.57

Percentage of time per day in Zone 50–60% HRR [%]

2.67 ± 2.05

1.94

[1.78; 3.56]

2.17 ± 1.36

1.94

[1.25; 3.08]

3.13 ± 2.5

1.98

[1.54; 4.72]

−.55

.61

Percentage of time per day in Zone 60–70% HRR [%]

0.62 ± 0.62

0.58

[0.35; 0.89]

0.48 ± 0.36

.58

[0.24; 0.72]

0.74 ± 0.79

0.55

[0.24; 1.24]

−.68

.53

Percentage of time per day in Zone 70–80% HRR [%]

0.33 ± 0.68

0.11

[0.04; 0.63]

0.21 ± 0.25

.09

[0.04; 0.38]

0.45 ± 0.91

0.15

[− 0.13; 1.02]

−.59

.57

Percentage of time per day in Zone 80–90% HRR [%]

0.14 ± 0.23

0.05

[0.04;0.24]

0.05 ± 0.11

0

[− 0.02; 0.12]

0.23 ± 0.29

0.12

[0.04; 0.41]

−2.2

.03

Percentage of time per day in Zone 90–100% HRR [%]

0.11 ± 0.23

0

[0.01; 0.21]

0.003 ± 0.007

0

[− 0.002; 0.01]

0.20 ± 0.29

0.03

[0.02; 0.39]

−2.69

.01*

Percentage of incidental PA compared to structured PA in Zone ≥50% HRR [%]

76.89 ± 22.51 (n = 23)

77.37

[67.15; 86.62]

70.27 ± 24.18 (n = 11)

73.15

[54.02; 86.51]

82.96 ± 19.96 (n = 12)

93.50

[70.28; 95.64]

− 1.51

.15

Percentage of incidental PA compared to structured PA in Zone 50–60% HRR [%]

87.53 ± 16.58 (n = 23)

94.26

[80.36; 94.70]

77.59 ± 19.44 (n = 11)

76.93

[64.51; 90.63]

96.66 ± 4.0 (n = 12)

98.33

[94.12; 99.20]

−2.39

.02

Percentage of incidental PA compared to structured PA in Zone 60–70% HRR [%]

70.50 ± 29.90 (n = 23)

74.11

[57.57; 83.43]

60.12 ± 33.15 (n = 11)

67.11

[37.85; 82.39]

80.01 ± 24.14 (n = 12)

87.87

[64.68; 95.35]

− 1.52

.15

Percentage of incidental PA compared to structured PA in Zone 70–80% HRR [%]

47.88 ± 44.78 (n = 19)

29.76

[26.30; 69.47]

43.17 ± 43.82 (n = 8)

27.91

[6.54; 79.80]

51.31 ± 47.27 (n = 11)

30.21

[19.55; 83.07]

−.68

.55

Percentage of incidental PA compared to structured PA in Zone 80–90% HRR [%]

36.29 ± 47.12 (n = 15)

4.44

[10.20; 62.38]

20.00 ± 44.72 (n = 5)

0

[− 35.53; 75.53]

44.43 ± 48.41 (n = 10)

19.95

[9.80; 79.07]

− 1.45

.21

Percentage of incidental PA compared to structured PA in Zone 90–100% HRR [%]

30.32 ± 45.70 (n = 11)

0

[− 0.38; 61.03]

0 ± 0 (n = 2)

0

37.07 ± 48.27 (n = 9)

1.97

[− 0.04; 74.17]

−1.30

.33