2 RESEARCH ARTICLES + 8 GRAPHICS – CLICK ON IMAGE TO ENLARGE
Beattie, Kris; Kenny, Ian C. et al;
– Running economy (RE) and velocity at maximal oxygen uptake (VVO2max) are considered to be the best physiological performance indicators in elite distance runners.
– In addition to cardiovascular function, RE and VVO2max are partly dictated by neuromuscular factors.
– One technique to improve neuromuscular function in athletes is through strength training.
– Investigate the effect of a 40-week strength training intervention on strength (maximal and reactive strength), VVO2max, economy, and body composition (body mass, fat, and lean mass) in competitive distance runners.
– 20 competitive distance runners were divided into an intervention group (n = 11; 29.5 ± 10.0 years; 72.8 ± 6.6 kg; 1.83 ± 0.08 m) and a control group (n = 9; 27.4 ± 7.2 years; 70.2 ± 6.4 kg; 1.77 ± 0.04 m).
– During week 0, 20, and 40, each subject completed 3 assessments: physiology (V2 mmol·L−1 BLa, V2 mmol·L−1 BLa [blood lactate], V4 mmol·L−1 BLa, RE, VV[Combining Dot Above]O2max, V[Combining Dot Above]O2max), strength (1 repetition maximum back squat; countermovement jump and 0.3 m drop jump), and body composition (body mass, fat mass, overall lean, and leg lean). RESULTS
1. The intervention group showed significant improvements in maximal and reactive strength qualities, RE, and VVO2max, at weeks 20 and 40
2. The control group showed no significant changes at either time point.
3. There were no significant changes in body composition variables between or within groups.
– This study demonstrates that 40 weeks of strength training can significantly improve maximal and reactive strength qualities, RE, and VVO2max, without concomitant hypertrophy, in competitive distance runners.
– Several strategies have been used to improve running economy (RE).
– Defined as the oxygen uptake required at a given submaximal running velocity, it has been considered a key aerobic parameter related to endurance running performance.
– In this context, concurrent strength and endurance training has been considered an effective method, although conclusions on the optimal concurrent training cannot yet be drawn.
– To evaluate the effect of concurrent training on RE in endurance running athletes and identify the effects of subject characteristics and concurrent training variables on the magnitude of RE improvement.
– We conducted a computerized search of the PubMed and Web of Science databases, and references of original studies were searched for further relevant studies. The analysis comprised 20 effects in 16 relevant studies published up to August 2015. The outcomes were calculated as the difference in percentage change between control and experimental groups (% change) and data were presented as mean ± 95 % confidence limit. Meta-analyses were performed using a random-effects model and, in addition, simple and multiple meta-regression analyses were used to identify effects of age, training status, number of sessions per week, training duration, type of strength training, and neuromuscular performance on % change in RE.
1. The concurrent training program had a small beneficial effect on RE
2. In addition, explosive and heavy weight training programs produced similar improvements in RE, while isometric training in selected studies did not induce a significant effect.
3. The multiple linear meta-regression analysis showed that all the differences between % changes could be explained by including the above-mentioned characteristics of subjects and weight training program elements.
4. This model showed that the magnitude of the % change in RE was larger for longer training duration
– Explosive training and heavy weight training are effective concurrent training methods aiming to improve RE within a few weeks.
– However, long-term training programs seem to be necessary when the largest possible improvement in RE is desired.