Sprint performance is an important characteristic for success in many sports, including rugby union. Resistance training is used to increase muscular fitness (i.e. strength, endurance and power) and may also be effective for improving sprint and jump performances. The aims of this study were to examine the effects of resistance training using two different periodized programs (linear and daily undulating) on sprint and jump performance and explore relationships between performance measures. Sixteen male (16.9 ± 1.0 y) adolescent rugby union players participated in 12 weeks of resistance training. A further 10 male (15.5 ± 1.0 y) participants were recruited as a control group. Assessments of strength (box squat), 10 and 20 m sprint (electronically timed), and jump height (maximal unloaded (body mass only) and loaded (body mass + 10 kg) countermovement jumps) were conducted before and after 12 weeks training. Large to very large increases in 1RM box squat (linear: 33.9%; p < 0.001; ES = 1.64; daily undulating: 44.5%; p < 0.001; ES = 2.33) were observed after training. Small decreases were seen in 10 (linear: -1.6%; p = 0.171; ES = -0.84; daily undulating: -2.5%; p = 0.038; ES = -0.36) and 20 m (linear: -0.5%; p = 0.506; ES = -0.20; daily undulating: -1.7%; p = 0.047; ES = -0.27) sprint times. Small-to-moderate associations between changes in lower body strength and improvements in 10 and 20 m sprint times were found. Resistance training increases lower body strength in adolescent rugby union players and increases in lower body strength may transfer to improved sprinting performance with improvements following daily undulating periodized resistance training slightly superior.
1School of Biomedical Sciences and Pharmacy, Faculty of Health and Medicine, University of Newcastle, NSW, Australia, 2308
2Priority Research Centre in Physical Activity and Nutrition, The University of Newcastle, Callaghan, NSW, Australia 2308
3School of Education, Faculty of Education and Arts, University of Newcastle, NSW, Australia, 2308
4School of Health Sciences, Faculty of Health and Medicine, The University of Newcastle, Callaghan, NSW, Australia 2308
5Hunter New England Health, John Hunter Hospital, New Lambton, NSW, Australia, 2305
Corresponding Author: Simon Harries, B Teach/B Health & Physical Ed School of Biomedical Sciences and Pharmacy Faculty of Health and Medicine University of Newcastle University Drive Callaghan NSW 2308 Australia Tel + 61-421-978 664 Email Simon.Harries@uon.edu.au