Mohr, Magni4; Nordsborg, Nikolai Baastrup9; Lindenskov, Annika5; Steinholm, Hildigunn6; Nielsen, Hans Petur7; Mortensen, Jann10; Weihe, Pal8; Krustrup, Peter9
1 Integrated Physiology, Department of Nutrition, Exercise and Sports, Faculty of Science, Københavns Universitet2 Department of Clinical Medicine, Department of Clinical Medicine, Faculty of Health and Medical Sciences, Københavns Universitet3 Center for Holdspil og Sundhed, Department of Nutrition, Exercise and Sports, Faculty of Science, Københavns Universitet4 Department of Food and Nutrition, and Sport Sciences, University of Gothenburg, Gothenburg5 The Faroese Confederation of Sports and Olympic Committee, Torshavn6 Department of Nursing, Faculty of Natural and Health Sciences, University of the Faroe Islands, Torshavn7 Southern Hospital, The Faroese Hospital System8 Department of Occupational Medicine and Public Health, The Faroese Hospital System, Torshavn9 Integrated Physiology, Department of Nutrition, Exercise and Sports, Faculty of Science, Københavns Universitet10 Department of Clinical Medicine, Department of Clinical Medicine, Faculty of Health and Medical Sciences, Københavns Universitet
To test the hypothesis that high-intensity swim training improves cardiovascular health status in sedentary premenopausal women with mild hypertension, sixty-two women were randomized into high-intensity (n = 21; HIT), moderate-intensity (n = 21; MOD), and control groups (n = 20; CON). HIT performed 6-10 × 30 s all-out swimming interspersed by 2 min recovery and MOD swam continuously for 1 h at moderate intensity for a 15-week period completing in total 44 ± 1 and 43 ± 1 sessions, respectively. In CON, all measured variables were similar before and after the intervention period. Systolic BP decreased (P < 0.05) by 6 ± 1 and 4 ± 1 mmHg in HIT and MOD; respectively. Resting heart rate declined (P < 0.05) by 5 ± 1 bpm both in HIT and MOD, fat mass decreased (P < 0.05) by 1.1 ± 0.2 and 2.2 ± 0.3 kg, respectively, while the blood lipid profile was unaltered. In HIT and MOD, performance improved (P < 0.05) for a maximal 10 min swim (13 ± 3% and 22 ± 3%), interval swimming (23 ± 3% and 8 ± 3%), and Yo-Yo IE1 running performance (58 ± 5% and 45 ± 4%). In conclusion, high-intensity intermittent swimming is an effective training strategy to improve cardiovascular health and physical performance in sedentary women with mild hypertension. Adaptations are similar with high- and moderate-intensity training, despite markedly less total time spent and distance covered in the high-intensity group.