title: Longitudinal assessment of the effects of field-hockey training on repeated sprint ability.
abstract: Repeated-sprint ability is thought to be an important fitness component of team sports. However, little is known about the effect sport-specific training has on this fitness component. Therefore, the purpose of this study was to investigate the effects of field-hockey specific training on repeated-sprint ability, plasma hypoxanthine (Hx) concentration and other blood parameters in 18 elite female field-hockey players. All subjects performed a repeated-sprint ability test on a cycle ergometer (5 x 6-sec maximal sprints every 30 secs) before and after seven weeks of training, designed to improve repeated-sprint ability. Following training, there was a significant (P< 0.05) increase in absolute total work (20.73+/-2.00 to 21.15+/-2.07 kJ, mean+/-SD). However, there was no significant change in total work when expressed per kg of body mass (341.3+/-16.4 to 345.5+/-18.8 J x kg(-1)). In addition, training resulted in a significant (P< 0.05) decrease in change values (peak-rest values) for Hx (8.2+/-3.8 to 5.5+/-2.7 micromol x L(-1)) and hydrogen ion concentration (22.8+/-5.2 to 19.1+/-5.1 nmol x L(-1)). The significant increase in absolute total work following seven weeks of field-hockey specific training was most likely due to an increase in lean muscle mass. The significant decrease in plasma Hx concentration (post-test minus rest values) following seven weeks of field hockey-specific training provides evidence that Hx production and/or efflux from the muscle are reduced. Therefore, one adaptation of sport-specific repeated-sprint training may be to conserve the purine nucleotide pool.
authors.affiliation: Team Sport Research Centre Group, School of Human Movement and Exercise Science, The University of Western Australia, Crawley, Western Australia, Australia.
authors.forename: M
authors.initials: M
authors.lastname: Spencer
authors.forename: D
authors.initials: D
authors.lastname: Bishop
authors.forename: S
authors.initials: S
authors.lastname: Lawrence
mesh_terms: D000222:Adaptation, Physiological; D000328:Adult; D015992:Body Mass Index; D005080:Exercise Test; D005260:Female; D006688:Hockey / Q000502:physiology*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D019271:Hypoxanthine / Q000097:blood; D019344:Lactic Acid / Q000097:blood; D008137:Longitudinal Studies; D010806:Physical Education and Training / Q000379:methods*; D012420:Running / Q000502:physiology*; D012885:Skinfold Thickness
chemical_list: D019271:Hypoxanthine; D019344:Lactic Acid