B. R. Krustrup

Recreational soccer is an effective health-promoting activity for untrained men

To examine the effects of regular participation in recreational soccer on health profile, 36 healthy untrained Danish men aged 20–43 years were randomised into a soccer group (SO; n = 13), a running group (RU; n = 12) and a control group (CO; n = 11). Training was performed for 1 h two or three times per week for 12 weeks; at an average heart rate of 82% (SEM 2%) and 82% (1%) of HRmax for SO and RU, respectively. During the 12 week period, maximal oxygen uptake increased (p<0.05) by 13% (3%) and 8% (3%) in SO and RU, respectively. In SO, systolic and diastolic blood pressure were reduced (p<0.05) from 130 (2) to 122 (2) mm Hg and from 77 (2) to 72 (2) mm Hg, respectively, after 12 weeks, with similar decreases observed for RU. After the 12 weeks of training, fat mass was 3.0% (2.7 (0.6) kg) and 1.8% (1.8 (0.4) kg) lower (p<0.05) for SO and RU, respectively. Only SO had an increase in lean body mass (1.7 (0.4) kg, p<0.05), an increase in lower extremity bone mass (41 (8) g, p<0.05), a decrease in LDL-cholesterol (2.7 (0.2) to 2.3 (0.2) mmol/l; p<0.05) and an increase (p<0.05) in fat oxidation during running at 9.5 km/h. The number of capillaries per muscle fibre was 23% (4%) and 16% (7%) higher (p<0.05) in SO and RU, respectively, after 12 weeks. No changes in any of the measured variables were observed for CO. In conclusion, participation in regular recreational soccer training, organised as small-sided drills, has significant beneficial effects on health profile and physical capacity for untrained men, and in some aspects it is superior to frequent moderate-intensity running.

Positive performance and health effects of a football training program over 12 weeks can be maintained over a 1-year period with reduced training frequency

We examined whether improvements in the performance and health profile of an intensive 12‐week football intervention could be maintained with a reduced training frequency. Seventeen healthy untrained males completed the study. Ten subjects trained 2.4 times/week for 12 weeks and another 52 weeks with 1.3 sessions/week [football group (FG)] and seven subjects acted as controls [control group (CG)]. For FG, fat mass (3.2 kg) and systolic blood pressure (8 mmHg) were lower (P<0.05) after 64 than 0 weeks, and VO2max (8%) and Yo‐Yo intermittent endurance level 2 test performance (49%) were higher (P<0.05), with no difference between 64 and 12 weeks. After 64 weeks, quadriceps muscle mass (11%), mean fiber area (10%) and citrate synthase activity (18%) were higher (P<0.05) than those at 0 weeks. Leg bone mass (3.5%) and density (2.0%) were higher (P<0.05) after 64 than 0 weeks, but not different between 12 and 0 weeks. Plantar jump force (17–18%), 30‐m sprinting velocity (1.3–3.0%) and muscle glycogen concentration (19–21%) were higher (P<0.05) and blood lactate during submaximal exercise was lower (27–72%, P<0.05) after 64 than after 12 and 0 weeks. The above‐mentioned variables were unaltered for CG. In conclusion, positive adaptations in cardiovascular fitness obtained over 12 weeks of regular recreational football training can be maintained over a 1‐year period with a reduced training frequency, with further development in musculo‐skeletal fitness.

The development of social capital through football and running: studying an intervention program for inactive women.

This article examines the development of social capital through the use and dynamics of different types of stories (“I,”“we” and “they”) as described by Robert D. Putnam. The data come from a research project in which inactive women participated in a 16‐week intervention program of physical exercise, either in the form of football or running. The study shows a positive development of social capital in the two different types of physical activity. The I‐stories show themselves to be central to bonding within the two groups and bridging outside the groups (developing and/or creating networks). The study also points to the importance of the activity itself for internal bonding illustrated through we‐ and they‐stories. Our data indicate that team sports, such as football, may have an advantage over individual sports in the development of social capital.

Performance enhancements and muscular adaptations of a 16‐week recreational football intervention for untrained women

The present study investigated the performance effects and physiological adaptations over 16 weeks of recreational football training and continuous running for healthy untrained premenopausal women in comparison with an inactive control group [Football group (FG): n=21; running group (RG): n=18; CO: n=14]. Two weekly 1‐h training sessions were performed in FG and RG. After 4 and 16 weeks of training VO2max was elevated (P<0.05) by 7% and 15%, respectively, in FG, and by 6% and 10%, respectively, in RG. After 16 weeks, Yo‐Yo intermittent endurance level 2 performance was 33% and 19% better (P<0.05) for FG and 29% and 21% better (P<0.05) for RG than after 4 and 0 weeks, respectively. Peak sprinting speed was 12% higher (21.0 ± 0.6 vs 18.8 ± 0.7 km/h; P<0.05) for FG after the training period, whereas no difference was observed for RG. After 4 weeks citrate synthase (CS) and 3‐hydroxyacyl‐CoA dehydrogenase (HAD) activity was 9% and 8%, respectively, higher (P<0.05) than before training in FG with no further changes during the last 12 weeks. In RG, CS increased (P<0.05) by 12% after 4 weeks and no significant increase was observed for HAD. In FG, the number of capillaries per fiber was 18% higher (P<0.05) after 16 weeks (2.44 ± 0.15 vs 2.07 ± 0.05 cap/fiber), with no significant difference for RG. No differences were observed between 0 and 16 weeks for CO. In conclusion, recreational womens football leads to significant increases in VO2max, performance and muscular adaptations throughout a 16‐week training period. Thus, football can be used as an activity to elevate the physical capacity of untrained women.

The "Football is Medicine" platform-scientific evidence, large-scale implementation of evidence-based concepts and future perspectives

Krustrup, Peter; Williams, C A; Mohr, Magni; Hansen, Peter Riis; Helge, Eva Wulff; Elbe, Anne-Marie; de Sousa, M; Dvorak, J; Junge, A; Hammami, A; Holtermann, Andreas; Larsen, Malte Nejst; Kirkendall, D; Schmidt, Jakob Friis; Andersen, Thomas Rostgaard; Buono, P; Rørth, M; Parnell, D; Ottesen, Laila; Bennike, Søren; Nielsen, Jens Jung; Mendham, A E; Zar, A; Uth, Jacob; Hornstrup, Therese; Brasso, Klaus; Nybo, Lars; Krustrup, Birgitte Rejkjær; Meyer, T; Aagaard, Per; Andersen, J L; Hubball, H; Reddy, P A; Ryom, Knud; Lobelo, F; Barene, S; Helge, Jørn Wulff; Fatouros, I G; Nassis, G P; Xu, J C; Pettersen, S A; Calbet, J A; Seabra, A; Rebelo, A N; Figueiredo, P; Póvoas, S; Castagna, C; Milanovic, Z; Bangsbo, Jens; Randers, Morten B; Brito, J