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Table 1 Characteristics of exercise-trained men

From: Effect of betaine supplementation on plasma nitrate/nitrite in exercise-trained men

Variable

Study 1

N = 8

Study 2

N = 13

Study 3

N = 10

Age (yrs)

25 ± 6

23 ± 3

27 ± 5

Height (cm)

178 ± 6

178 ± 8

178 ± 3

Weight (kg)

86 ± 15

82 ± 12

81 ± 7

BMI (kg∙m-2)

27 ± 4

26 ± 4

26 ± 3

Body fat (%)

17 ± 5

15 ± 7

13 ± 6

Waist:Hip

0.81 ± 0.05

0.84 ± 0.04

0.82 ± 0.04

Resting heart rate (bpm)

66 ± 5

68 ± 5

62 ± 10

Resting SBP (mmHg)

117 ± 6

114 ± 11

111 ± 11

Resting DBP (mmHg)

74 ± 8

73 ± 9

61 ± 8

Years resistance exercise training

7 ± 8

4 ± 3

7 ± 6

Hours per week resistance exercise

4 ± 3

4 ± 1

4 ± 1

Years aerobic exercise training

4 ± 4

3 ± 3

5 ± 4

Hours per week aerobic exercise

2 ± 1

2 ± 2

2 ± 1

  1. Data are mean ± SD.
  2. Study 1: cross-over design with subjects consuming either 1.25 or 5.00 grams of betaine in a single ingestion.
  3. Study 2: cross-over design with subjects consuming 2.5 grams of betaine or a placebo daily for 14 days; 21 day washout period between each condition.
  4. Study 3: subjects consumed 6 grams of betaine daily for 7 days.