Per Thomas Byrkjedal

• Byrkjedal, Per Thomas (2024). Assessing the individual relationships between physical test improvements and external load match parameters in male professional football players—a brief report. Frontiers in Sports and Active Living. ISSN 2624-9367. 6. doi: 10.3389/fspor.2024.1367894. Fulltekst i vitenarkiv
• Byrkjedal, Per Thomas; Thunshelle, Atle; Spencer, Matthew; Luteberget, Live Steinnes; Ivarsson, Andreas & Vårvik, Fredrik Tonstad [Vis alle 8 forfattere av denne artikkelen] (2023). In-season autoregulation of one weekly strength training session maintains physical and external load match performance in professional male football players. Journal of Sports Sciences. ISSN 0264-0414. 41(6), s. 536–546. doi: 10.1080/02640414.2023.2227536. Fulltekst i vitenarkiv Vis sammendrag

  The aim of this study was to compare the effects of autoregulating strength training volume based on an objective (external load match performance) versus a subjective (self-selected) method in professional male football players. Sixteen players completed a 10-week strength training programme where the number of sets was regulated based on football match high-intensity running distance (HIR >19.8 km/h, AUTO, n = 7), or self-selected (SELF, n = 9). In addition to traditional physical performance assessments (30-m sprint, countermovement jump, leg-strength, and body composition), external load match performance was assessed with five matches in the beginning and in the end of the study period. Both groups performed ~ 1 weekly bout of ~ 6 sets in leg extensor exercises during the 10-week period, and maintained physical performance during the competitive season, with no group differences detected after the training period. Non-overlap of all pairs (NAP) analysis showed weak-to-moderate effects in external load match performance from before to after the study period, suggesting that players maintained or improved their performance. In conclusion, no group differences were observed, suggesting that both external load autoregulated and self-selected, low-volume in-season strength training maintained physical, and external load match performance in professional male football players.

• Byrkjedal, Per Thomas; Bjørnsen, Thomas; Luteberget, Live; Lindberg, Kolbjørn Andreas; Ivarsson, Andreas & Haukali, Eirik [Vis alle 7 forfattere av denne artikkelen] (2023). Association Between Physical Performance Tests and External Load During Scrimmages in Highly Trained Youth Ice Hockey Players. International Journal of Sports Physiology and Performance (IJSPP). ISSN 1555-0265. 18(1), s. 47–54. doi: 10.1123/ijspp.2022-0225. Fulltekst i vitenarkiv Vis sammendrag

  Purpose: To investigate the relationship between physical performance tests and on-ice external load from simulated games (scrimmages) in ice hockey. Methods: A total of 14 players completed a physical performance test battery consisting of 30-m sprint test—run and 30-m sprint test—skate (including 10-m split times and maximum speed), countermovement jump, standing long jump, bench press, pull-ups, and trap bar deadlift and participated in 4 scrimmages. External load variables from scrimmages included total distance; peak speed; slow (< 11.0 km/h), moderate (11.0–16.9 km/h), high (17.0–23.9 km/h), and sprint (> 24.0 km/h) speed skating distance; number of sprints; PlayerLoad™; number of high-intensity events (> 2.5 m/s); accelerations; decelerations; and changes of direction. Bayesian pairwise correlation analyses were performed to assess the relationship between physical performance tests and external load performance variables. Results: The results showed strong evidence (Bayes factor > 10) for associations between pull-ups and high-intensity events (τ = .61) and between maximum speed skate and peak speed (τ = .55). There was moderate evidence (Bayes factor >3 to <10) for 6 associations: both maximum speed skate (τ = .44) and countermovement jump (τ = .44) with sprint speed skating distance, countermovement jump with number of sprints (τ = .46), pull-ups with changes of direction (τ = .50), trap bar with peak speed (τ = .45), and body mass with total distance (τ = .49). Conclusion: This study found physical performance tests to be associated with some of the external load variables from scrimmages. Nevertheless, the majority of correlations did not display meaningful associations, possibly being influenced by the selection of physical performance tests.

• Byrkjedal, Per Thomas; Luteberget, Live; Bjørnsen, Thomas; Ivarsson, Andreas & Spencer, Matthew (2022). Simulated Game-Based Ice Hockey Match Design (Scrimmage) Elicits Greater Intensity in External Load Parameters Compared With Official Matches. Frontiers in Sports and Active Living. ISSN 2624-9367. 4. doi: 10.3389/fspor.2022.822127. Fulltekst i vitenarkiv Vis sammendrag

  Objective: A limited number of studies have explored the external load experienced in indoor sports such as ice hockey, and few the link between training and match performance. As a paucity exists within this topic, this study explored whether a simulated match design (i.e., scrimmage) could be representative of official match demands and elicit similar external loads as in official matches in a group of elite youth male ice hockey players. Methods: A total of 26 players were monitored during eight official and four simulation matches using a Local Positioning System. Total distance, max velocity, slow (0–10.9 km/h), moderate (11–16.9 km/h), high (17.0–23.9 km/h), and sprint (>24 km/h) speed skating distance, distance per min, PlayerLoadTM, PlayerLoadTM per min, high-intensity events (HIEs) (>2.5 m/s−2), acceleration (ACCs), decelerations (DECs), and change of directions (CODs) were extracted from the tracking devices. A two-level regression analysis was conducted to compare the difference between match types when controlling for time on ice, match day, and position. Results: Between match-type results showed a credible difference in all variables except max velocity and ACCs. Distance per min was 27.3% higher during simulation matches and was explained by a 21.3, 24.1, and 14.8% higher distance in sprint-, high-, and moderate speed skating distance, while slow speed-skating distance was 49.2% lower and total distance only trivially different from official to simulation matches. Total PlayerLoadTM was 11.2% lower, while PlayerLoadTM per min was 8.5% higher during simulation matches. HIEs, CODs, and DECs were 10.0, 11.9, and 22.3% higher during simulation matches. Conclusion: The simulated match design is related to official match demands with comparable match-time, playing time, number of shifts, and shift duration. However, simulation matches provoked a higher external load output compared with official matches, possibly explained by a more continuous movement design. A game-based simulation match design can therefore be utilized when match-related actions at high intensity are warranted.

• Almquist, Nicki Winfield; Løvlien, Ine; Byrkjedal, Per Thomas; Spencer, Matthew; Kristoffersen, Morten & Skovereng, Knut [Vis alle 8 forfattere av denne artikkelen] (2020). Effects of Including Sprints in One Weekly Low-Intensity Training Session During the Transition Period of Elite Cyclists. Frontiers in Physiology. ISSN 1664-042X. 11. doi: 10.3389/fphys.2020.01000. Fulltekst i vitenarkiv Vis sammendrag

  The purpose of this study was to investigate the effects of including 30-s sprints in one weekly low-intensity training (LIT) session during a 3-week transition period in elite cyclists. Sixteen male elite cyclists (maximal oxygen uptake, VO2max: 72 ± 5 ml·kg−1·min−1) reduced their training load by ~60% for 3 weeks from the end of competitive season and performed only LIT or included 30-s sprints (SPR) in one weekly LIT-session. Performance and physiological capacities were evaluated during a prolonged (~2.5 h) test-session, including a strength test, a submaximal blood lactate profile test, an incremental test to exhaustion to determine VO2max, 1 h continuous cycling including four maximal 30-s sprints, and a 20-min all-out test. In addition, mental recovery was evaluated using the Athlete Burnout Questionnaire (ARQ). The only significant between-group change during the transition period was an 8 ± 11% larger improvement in 30-s sprint performance in SPR compared to control (CON; SPR: 4 ± 5%, CON: −4 ± 5%, p = 0.01). Although not different from CON, SPR maintained 20-min all-out performance (−1 ± 5%, p = 0.37) and fractional utilization of VO2max (1.9 ± 6.1%-points, p = 0.18) during the 20-min all-out test, whereas corresponding declines were observed in CON (−3 ± 5%, p = 0.04, and −2.5 ± 2.9%-points, p = 0.02, respectively). Power output at 4 mmol·L−1 blood lactate concentration decreased similarly in SPR (−4 ± 4%, p = 0.02) and CON (−5 ± 5%, p = 0.01), while VO2max, maximal aerobic power (Wmax), and total burnout score were unaffected in both groups. Including sprints in one weekly LIT-session in the transition period improves sprint performance and maintains 20-min all-out power and fractional utilization of VO2max without compromising mental recovery. Inclusion of sprints in LIT-sessions may therefore be a plausible, time-efficient strategy during short periods of reduced training.

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• Byrkjedal, Per Thomas (2023). Vintertrening og forberedelser mot neste sesong.
• Byrkjedal, Per Thomas (2023). Fysisk trening og testing for dommere .
• Byrkjedal, Per Thomas; Thunshelle, Atle; Spencer, Matthew; Luteberget, Live Steinnes; Ivarsson, Andreas & Vårvik, Fredrik Tonstad [Vis alle 8 forfattere av denne artikkelen] (2023). In-season autoregulation of one weekly strength training session maintains physical performance in professional male football players.
• Spencer, Matthew; Byrkjedal, Per Thomas; Luteberget, Live Steinnes; Ivarsson, Andreas & Bjørnsen, Thomas (2023). Assessing the individual relationship between physical fitness improvements and external load match performance in male professional football players – a case study.
• Byrkjedal, Per Thomas & Johansen, Bjørn Tore (2023). Vi er forberedt – er du? . Fædrelandsvennen. ISSN 0805-3790.
• Byrkjedal, Per Thomas (2022). Er de sterkeste og raskeste hockeyspillerne også de beste på isen? .
• Byrkjedal, Per Thomas; Bjørnsen, Thomas; Luteberget, Live Steinnes; Lindberg, Kolbjørn Andreas; Ivarsson, Andreas & Haukali, Eirik [Vis alle 7 forfattere av denne artikkelen] (2022). Relationship between external load from simulated ice-hockey games and physical test performance.
• Byrkjedal, Per Thomas (2022). Er de sterkeste og raskeste hockeyspillerne også de beste på isen? lokalavisen fedrelandsvennen.
• Byrkjedal, Per Thomas (2022). Forskning på ishockey. Dagsavisen. ISSN 1503-2892.
• Byrkjedal, Per Thomas (2022). Har forsket på Oilers. [Avis]. Dagsavisen.
• Byrkjedal, Per Thomas (2022). Har forsket på Oilers. Rogalands Avis.
• Byrkjedal, Per Thomas (2022). Forskning på Ishockey. Dagsavisen. ISSN 1503-2892.
• Byrkjedal, Per Thomas (2021). Hva gjør alle kampene med stjernespillernes kropper? Adresseavisen. ISSN 0805-3804.
• Byrkjedal, Per Thomas (2021). Hva gjør alle kampene med stjernespillernes kropper? . Romsdals Budstikke.. ISSN 0806-5160.
• Byrkjedal, Per Thomas (2021). Hva gjør alle kampene med stjernespillernes kropper? . Folkebladet.no.
• Byrkjedal, Per Thomas (2021). Hva gjør alle kampene med stjernespillernes kropper? . Stavanger Aftenblad. ISSN 0804-8991.
• Byrkjedal, Per Thomas (2021). Hva gjør alle kampene med stjernespillernes kropper? . Fædrelandsvennen. ISSN 0805-3790.
• Lohne-Seiler, Hilde; Torstveit, Monica Klungland; Johansen, Bjørn Tore; Pedersen, Andreas; Brynjulfsen, Trine & Byrkjedal, Per Thomas [Vis alle 7 forfattere av denne artikkelen] (2020). FROM UNTRAINED 55+ TO A TRIATHLETE. A PILOT STUDY.
• Byrkjedal, Per Thomas (2020). Hvorfor løper fotball­spil­lere rundt med en sports-bh? Og hvorfor bruker norske klubber flere millioner kroner på det? Utstyret gir enorme mengder informasjon, men blir kjøpt inn og tatt i bruk uten systematisk testing. Fædrelandsvennen. ISSN 0805-3790.
• Byrkjedal, Per Thomas (2020). Hvorfor løper fotballspillere rundt med en sport-bh? Og hvorfor bruker norske klubber flere millioner kroner på det? KRONIKK: Utstyret gir enorme mengder informasjon, men blir kjøpt inn og tatt i bruk uten systematisk testing. Forskning.no. ISSN 1891-635X.
• Byrkjedal, Per Thomas (2020). UiA-forskar sparkar i gang samspel med Start. [Internett]. uia.no/nyheter/uia-forskar-sparkar-i-gang-samspel-med-start.
• Byrkjedal, Per Thomas (2020). Kroppsskanning og lasermåling. Nytt samarbeid skal hjelpe Start på et viktig område. [Avis]. aftenposten.no & fvn.no.
• Byrkjedal, Per Thomas; Stenqvist, Thomas Birkedal; Torstveit, Monica Klungland; Bergsvik, Kristina & Spencer, Matthew (2020). No effect of a three-week post-season transition period on markers of RED-S in highly-trained male cyclists.
• Byrkjedal, Per Thomas (2024). Physical fitness and external load in icehockey and football An exploration of the relationships between physical test performance and external training and match load in highly trained players. Universitetet i Agder. ISSN 978-82-8427-178-1. Fulltekst i vitenarkiv

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