5 results on '"Brattebø, Jan-Magnus"'
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2. Performance-Determining Variables of a Simulated Sprint Cross-Country Skiing Competition.
- Author
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Talsnes, Rune Kjøsen, Brattebø, Jan-Magnus, Berdal, Tore, Seeberg, Trine, Skovereng, Knut, Losnegard, Thomas, Kocbach, Jan, and Sandbakk, Øyvind
- Subjects
EXERCISE tests ,OXYGEN consumption ,CARDIOPULMONARY system ,SIMULATION methods in education ,SNOW ,DESCRIPTIVE statistics ,MUSCLE strength ,HEART beat ,EXERCISE ,LACTATES ,EXERCISE intensity ,ATHLETIC ability ,SPORTS events ,SKIING ,SPRINTING - Abstract
Purpose: To investigate performance-determining variables of an on-snow sprint cross-country skiing competition and the evolvement in their relationship with performance as the competition progresses from the individual time trial (TT) to the final. Methods: Sixteen national-level male junior skiers (mean [SD] age, 18.6 [0.8] y; peak oxygen uptake [VO
2 peak], 67.6 [5.5] mL·min−1 ·kg−1 ) performed a simulated sprint competition (1.3 km) in the skating style, comprising a TT followed by 3 finals (quarterfinals, semifinals, and final) completed by all skiers. In addition, submaximal and incremental roller-ski treadmill tests, on-snow maximal speed tests, and strength/power tests were performed. Results: VO2 peak and peak treadmill speed during incremental testing and relative heart rate, rating of perceived exertion, blood lactate concentrations, and gross efficiency during submaximal testing were all significantly correlated with performance in the TT and subsequent finals (mean [range] r values:.67 [.53–.86], all P <.05). Relative VO2 peak and submaximal relative heart rate and blood lactate concentration were more strongly correlated with performance in the semifinals and final compared with the TT (r values:.74 [.60–.83] vs 0.55 [.51–.60], all P <.05). Maximal speed in uphill and flat terrain was significantly correlated with performance in the TT and subsequent finals (r values:.63 [.38–.70], all P <.05), while strength/power tests did not correlate significantly with sprint performance. Conclusions: VO2 peak and high-speed abilities were the most important determinants of sprint cross-country skiing performance, with an increased importance of VO2 peak as the competition format progressed toward the final. [ABSTRACT FROM AUTHOR]- Published
- 2024
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3. Comprehensive analysis of performance, physiological, and perceptual responses during an entire sprint cross-country skiing competition
- Author
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Talsnes, Rune Kjøsen, primary, Berdal, Tore, additional, Brattebø, Jan-Magnus, additional, Seeberg, Trine, additional, Losnegard, Thomas, additional, Kocbach, Jan, additional, and Sandbakk, Øyvind, additional
- Published
- 2023
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4. Field- and laboratory-derived determinants of performance in sprint cross-country skiing: time-trial versus final performance
- Author
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Brattebø, Jan-Magnus, Sandbakk, Øyvind, and Kocbach, Jan
- Abstract
Formål: Å undersøke felt- og laboratorie-baserte faktorer som påvirker utøvernes prestasjon i en sprintkonkurranse i langrenn. Siden prologen er godt undersøkt og det er mindre kunnskap om betydningen av prestasjonsbestemmende faktorer i knockout løpene, er et sekundært formål å sammenligne størrelsen på sammenhengen mellom de ulike faktorene og prestasjon i prologen og konkurransen helhetlig. Metode: Sytten mannlige junior utøvere (alder: 18.5 ± 0.8) som konkurrerer på nasjonalt nivå, gjennomførte en simulert sprintkonkurranse bestående av en prolog og fire knockout løp, i tillegg til andre tester; (1) 5-min submaksimale stadier og en gradvis økende test til utmattelse på mølle i G3-skøyting, for å fastslå høyeste målte oksygenopptak (V̇O2peak) og effektivitet (GE); (2) maksimal styrke (1RM) i nedtrekk og tricepspress, 1RM og maksimal effekt (PP) i benpress, og en 30-s Wingate test i staking; og (3) maksimal hastighet (Vmax) tester på snø i flatt terreng og oppoverbakke. Spearmans korrelasjon (rS) og multippel regresjonsanalyse ble benyttet for å bestemme forholdet mellom laboratorie- og felt-baserte prestasjonsbestemmende faktorer til prestasjon i prologen og finalen, målt gjennom plassering. Resultat: Det ble observert sterk korrelasjon for Vmax flat og V̇O2peak (L·min-1) med plassering både i prologen (rS= 0.75 og 0.70; begge p< 0.01) og i finalen (rS= 0.86 og 0.80; begge p< 0.01). Benpress PP, 1RM tricepspress and GE hadde også sterk og moderat korrelasjon med plassering i finalen (rS= 0.76, 0.60 og 0.54; alle p< 0.05). En sammenligning av størrelsen på korrelasjonene mellom faktorer og plassering i prolog og finale, viste at Vmax flat og 1RM tricepspress hadde en endring tilsvarende ΔrS > 1.5 SD (p= 0.07 and 0.06) hvorav effekten av endringen var moderat (q= 0.32 and 0.28). En kombinasjon av Vmax flat, GE og 1RM i tricepspress forklarte ~97% av all variasjon i plassering i finalen. Konklusjon: Vmax og V̇O2peak (L·min-1) er de to viktigste prestasjonsbestemmende faktorene i junior sprint langrenn. De samme faktorene som var assosiert med prestasjon i prologen, hadde en enda større betydning i finalen. Noen faktorer som ikke påvirket plassering i prologen, gjorde dette i finalen, hvorav effekten på endringen varierte fra moderat til liten. Betydningen av prestasjonsbestemmende faktorer ser ut til å være ulik i prologen vs konkurransen samlet sett, mens aerob og anaerob effekt ser ut til å være essensiell for å oppnå en høy plassering i en sprintkonkurranse i langrenn. Purpose: To investigate field- and laboratory-derived determinants of performance in a sprint cross-country skiing (XCS) competition. Since the time-trial (TT) in sprint XCS has previously been well researched and there is limited knowledge of the knockout heats, a secondary aim was to compare the magnitude of the associations between determinants and performance in the time-trial and overall competition. Methods: Seventeen male junior athletes (age: 18.5 ± 0.8) competing on a national level performed a simulated sprint XCS competition, including a TT and four knockout heats, followed by the tests; (1) 5-min submaximal stages and an incremental test to exhaustion while treadmill G3 skating to determine peak oxygen uptake (V̇O2peak) and gross efficiency (GE); (2) maximal strength (1RM) in pulldown and triceps press, 1RM and peak power (PP) in leg press, and a 30-s Wingate double poling test; and (3) maximal velocity (Vmax) tests in flat and uphill terrain on snow. Spearman’s rank-order correlation (rS) and multiple regression analysis explored the relationship between TT-rank and final rank in the XCS competition versus laboratory-, and field-based test-results. Results: Strong correlations were found between Vmax flat and V̇O2peak (L·min-1) and both TT-rank (rS= 0.75 and 0.70; both p< 0.01) and final rank (rS= 0.86 and 0.80; both p< 0.01). Leg press PP, 1RM triceps press and GE also showed strong and moderate correlations to the final rank (rS= 0.76, 0.60 and 0.54; all p< 0.05). Comparing the magnitude of associations between determinants and rank in the TT and final, found Vmax flat and 1RM triceps press to be ΔrS > 1.5 SD (p= 0.07 and 0.06), with moderate effect size (q= 0.32 and 0.28). Together, Vmax flat, GE and 1RM triceps press explained ~97% of variance in final rank. Conclusion: Vmax and V̇O2peak (L·min-1) are the two greatest determinants of performance in junior sprint XCS. The same determinants that were associated with TT-rank were more strongly associated with final rank. Furthermore, determinants that were not found to be significantly associated with TT-rank, were so with the final rank, in which the effect of the changes ranged from moderate to small. The influence of known determinants of performance appears to be different in a single time-trial vs a competition event and aerobic and anaerobic power seem to be essential in achieving a high rank in a sprint XCS competition
- Published
- 2022
5. Performance-Determining Variables of a Simulated Sprint Cross-Country Skiing Competition.
- Author
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Talsnes RK, Brattebø JM, Berdal T, Seeberg T, Skovereng K, Losnegard T, Kocbach J, and Sandbakk Ø
- Subjects
- Humans, Male, Adolescent, Oxygen Consumption physiology, Exercise Test, Lactic Acid, Skiing physiology, Skating
- Abstract
Purpose: To investigate performance-determining variables of an on-snow sprint cross-country skiing competition and the evolvement in their relationship with performance as the competition progresses from the individual time trial (TT) to the final., Methods: Sixteen national-level male junior skiers (mean [SD] age, 18.6 [0.8] y; peak oxygen uptake [VO2peak], 67.6 [5.5] mL·min-1·kg-1) performed a simulated sprint competition (1.3 km) in the skating style, comprising a TT followed by 3 finals (quarterfinals, semifinals, and final) completed by all skiers. In addition, submaximal and incremental roller-ski treadmill tests, on-snow maximal speed tests, and strength/power tests were performed., Results: VO2peak and peak treadmill speed during incremental testing and relative heart rate, rating of perceived exertion, blood lactate concentrations, and gross efficiency during submaximal testing were all significantly correlated with performance in the TT and subsequent finals (mean [range] r values: .67 [.53-.86], all P < .05). Relative VO2peak and submaximal relative heart rate and blood lactate concentration were more strongly correlated with performance in the semifinals and final compared with the TT (r values: .74 [.60-.83] vs 0.55 [.51-.60], all P < .05). Maximal speed in uphill and flat terrain was significantly correlated with performance in the TT and subsequent finals (r values: .63 [.38-.70], all P < .05), while strength/power tests did not correlate significantly with sprint performance., Conclusions: VO2peak and high-speed abilities were the most important determinants of sprint cross-country skiing performance, with an increased importance of VO2peak as the competition format progressed toward the final.
- Published
- 2023
- Full Text
- View/download PDF
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