• Affective Valence and Enjoyment in High- and Moderate-High Intensity Interval Exercise. The Tromsø Exercise Enjoyment Study 

      Hammer, Tord Markussen; Pedersen, Sigurd; Pettersen, Svein Arne; Rognmo, Kamilla; Sagelv, Edvard Hamnvik (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-03-22)
      Introduction: Exercise at high intensity may cause lower affective responses toward exercise compared with moderate intensity exercise. We aimed to elucidate affective valence and enjoyment in high- and moderate-high interval exercise.<p> <p>Methods: Twenty recreationally active participants (9 females, 11 males, age range: 20–51 years) underwent three different treadmill running exercise sessions ...
    • Associations between maximal strength, sprint, and jump height and match physical performance in high‐level female football players 

      Pedersen, Sigurd; Welde, Boye; Sagelv, Edvard Hamnvik; Heitmann, Kim Arne; Randers, Morten B.; Johansen, Dag; Pettersen, Svein Arne (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-08-06)
      Studies on females’ decisive physical components to physical match-play performance are sparse and only emphasize endurance tests. Thus, the influence of maximal strength and power on physical performance during match-play is currently unknown. The aim of this study was to assess the association between one repetition maximum (1RM) half squat strength, 5-, 10-, and 15-m sprint times, countermovement ...
    • Complex lifestyle intervention among inactive older adults with elevated cardiovascular disease risk and obesity: a mixed-method, single-arm feasibility study for RESTART—a randomized controlled trial 

      Deraas, Trygve Sigvart; Hopstock, Laila Arnesdatter; Henriksen, André; Morseth, Bente; Sand, Anne-Sofie; Njølstad, Inger; Pedersen, Sigurd; Sagelv, Edvard Hamnvik; Johansson, Jonas; Grimsgaard, Sameline (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-10-27)
      Background - Physical inactivity and obesity are global public health challenges. Older adults are important to target for prevention and management of disease and chronic conditions. However, many individuals struggle with maintaining increased physical activity (PA) and improved diet. This feasibility study provides the foundation for the RESTART trial, a randomized controlled trial (RCT) to test ...
    • Effects of Linear Versus Changes of Direction Repeated Sprints on Intermittent High Intensity Running Performance in High-level Junior Football Players over an Entire Season: A Randomized Trial 

      Sagelv, Edvard Hamnvik; Selnæs, Ivar; Pedersen, Sigurd; Pettersen, Svein Arne; Randers, Morten B.; Welde, Boye (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-08-06)
      <i>Abstract</i>: Background: Changes of direction (COD) repeated sprints (RSs) might have greater relevance to football than linear RSs. We aimed to compare the effects of linear and COD RSs on intermittent high intensity running (HIR) over an entire season. <p> <p><i>Methods</i>: In total, 19 high-level male football players (16–19 years) randomly performed linear RSs or COD RSs twice a week ...
    • Effects of Linear Versus Changes of Direction Repeated Sprints on Intermittent High Intensity Running Performance in High-level Junior Football Players over an Entire Season: A Randomized Trial 

      Sagelv, Edvard H.; Selnæs, Ivar; Pedersen, Sigurd; Pettersen, Svein Arne; Randers, Morten B.; Welde, Boye (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-08-06)
      <i>Background</i>: Changes of direction (COD) repeated sprints (RSs) might have greater relevance to football than linear RSs. We aimed to compare the effects of linear and COD RSs on intermittent high intensity running (HIR) over an entire season. <p> <p><i>Methods</i>: In total, 19 high-level male football players (16–19 years) randomly performed linear RSs or COD RSs twice a week during their ...
    • Females display lower risk of myocardial infarction from higher estimated cardiorespiratory fitness than males. The Tromsø Study 1994-2014 

      Sagelv, Edvard Hamnvik; Casolo, Andrea; Eggen, Anne Elise; Heitmann, Kim Arne; Johansen, Kristoffer Robin; Løchen, Maja-Lisa; Mathiesen, Ellisiv B.; Morseth, Bente; Njølstad, Inger; Osborne, John Owen; Hagerupsen, Karianne; Pedersen, Sigurd; Wilsgaard, Tom (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-01-06)
      Objective - To examine the dose-response association between estimated cardiorespiratory fitness (eCRF) and risk of myocardial infarction (MI).<p> <p>Patients and Methods - Adults who attended Tromsø Study surveys 4-6 (Janurary 1,1994-December 20, 2008) with no previous cardiovascular disease were followed up through December 31, 2014 for incident MI. Associations were examined using restricted ...
    • Flywheel squats versus free weight high load squats for improving high velocity movements in football. A randomized controlled trial 

      Sagelv, Edvard Hamnvik; Pedersen, Sigurd; Nilsen, Lars Petter R.; Casolo, Andrea; Welde, Boye; Randers, Morten B.; Pettersen, Svein Arne (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-10-02)
      <i>Background</i> - High load (HL: > 85% of one repetition maximum (1RM)) squats with maximal intended velocity contractions (MIVC) combined with football sessions can be considered a relevant and time-efficient practice for maintaining and improving high velocity movements in football. Flywheel (FW) resistance exercise (RE) have recently emerged with promising results on physical parameters associated ...
    • High intensity long interval sets provides similar enjoyment as continuous moderate intensity exercise. The Tromsø Exercise Enjoyment Study 

      Sagelv, Edvard Hamnvik; Hammer, Tord; Hamsund, Tommy; Rognmo, Kamilla; Pettersen, Svein Arne; Pedersen, Sigurd (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-08-06)
      <i>Objective</i>: High intensity interval exercise sessions with interval sets over 3 min may provide superior cardiorespiratory fitness benefits. To our knowledge, the exercise enjoyment of interval sets over 3 min is not yet elucidated. The aim of this study was to examine exercise enjoyment following one session with four intervals of 4 min high intensity exercise (HIIE) versus one session ...
    • Improved maximal strength is not associated with improvements in sprint time or jump height in high-level female football players: a clusterrendomized controlled trial 

      Pedersen, Sigurd; Heitmann, Kim Arne; Sagelv, Edvard Hamnvik; Johansen, Dag; Pettersen, Svein Arne (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-09-17)
      <i>Background</i> - Maximal strength increments are reported to result in improvements in sprint speed and jump height in elite male football players. Although similar effects are expected in females, this is yet to be elucidated. The aim of this study was to examine the effect of maximal strength training on sprint speed and jump height in high-level female football players.<p> <p><i>Methods</i> ...
    • The influence of age on the match-to-match variability of physical performance in women’s elite football 

      Winther, Andreas Kjæreng; Pedersen, Sigurd; Johansen, Dag; Pettersen, Svein Arne (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-05-15)
      Introduction: The fluctuation of external match load throughout a season is influenced by several contextual factors. While some, have been deeply analysed in men’s football literature, information is lacking on how other contextual elements, such as player’s age or experience, may affect the match-to-match variability of locomotor activities. In fact, aging has been described as a multifactorial ...
    • Maximal Strength, Sprint, and Jump Performance in High-Level Female Football Players Are Maintained With a Customized Training Program During the COVID-19 Lockdown 

      Pedersen, Sigurd; Johansen, Dag; Pettersen, Svein Arne; Sagelv, Edvard Hamnvik; Welde, Boye; Winther, Andreas Kjæreng; Casolo, Andrea; Randers, Morten B. (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-02-26)
      Introduction: The COVID-19 outbreak with partial lockdown has inevitably led to an alteration in training routines for football players worldwide. Thus, coaches had to face with the novel challenge of minimizing the potential decline in fitness during this period of training disruption.<p> <p>Methods: In this observational pre- to posttest study involving Norwegian female football players (18.8 ...
    • Physical activity levels in adults and elderly from triaxial and uniaxial accelerometry. The Tromsø Study 

      Sagelv, Edvard Hamnvik; Ekelund, Ulf; Pedersen, Sigurd; Brage, Søren; Hansen, Bjørge Hermann; Johansson, Jonas; Grimsgaard, Sameline; Nordström, Anna; Horsch, Alexander; Hopstock, Laila Arnesdatter; Morseth, Bente (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-12-03)
      <i>Introduction</i> - Surveillance of physical activity at the population level increases the knowledge on levels and trends of physical activity, which may support public health initiatives to promote physical activity. Physical activity assessed by accelerometry is challenged by varying data processing procedures, which influences the outcome. We aimed to describe the levels and prevalence estimates ...
    • Physiological Comparisons of Elite Male Visma Ski Classics and National Level Cross-Country Skiers During Uphill Treadmill Roller Skiing 

      Sagelv, Edvard Hamnvik; Engseth, Tina; Pedersen, Sigurd; Pettersen, Svein Arne; Mathisen, Gunnar; Heitmann, Kim Arne; Welde, Boye; Thomassen, Tor Oskar; Stoggl, Thomas Leonhard (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-11-16)
      Longer distance cross-country ski (14–220 km) races such as the Visma Ski Classics (VSC) has recently gained attention in addition to the traditional Olympic distances (5–50 km) associated with cross-country (XC) skiing. These long-distance races are characterized by extensive use of the upper body while double poling (DP). While there is a substantial amount of research on Olympic distance XC skiing, ...
    • Position specific physical performance and running intensity fluctuations in elite women's football 

      Winther, Andreas Kjæreng; Matias Do Vale Baptista, Ivan Andre; Pedersen, Sigurd; Thomsen, Morten Brendsgaard Randers; Krustrup, Peter; Johansen, Dag; Pettersen, Svein Arne (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-11-26)
      The purpose of the present study was to investigate the physical performance of elite female football players during match play along with transient alterations in running performance following 1- and 5-min univariate peak periods. 54 elite female players from four top-level Norwegian teams were monitored for one season (n = 393 match observations), and physical performance data collected using ...
    • Position specific physical performance and running intensity fluctuations in elite women’s football 

      Winther, Andreas Kjæreng; Matias Do Vale Baptista, Ivan Andre; Pedersen, Sigurd; Randers, Morten Bredsgaard; Johansen, Dag; Krustrup, Peter; Pettersen, Svein Arne (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-11-26)
      The purpose of the present study was to investigate the physical performance of elite female football players during match play along with transient alterations in running performance following 1- and 5-min univariate peak periods. 54 elite female players from four top-level Norwegian teams were monitored for one season (n = 393 match observations), and physical performance data collected ...
    • Ski Skating Race Technique—Effect of Long Distance Cross-Country Ski Racing on Choice of Skating Technique in Moderate Uphill Terrain 

      Ardigò, Luca Paolo; Stöggl, Thomas Leonhard; Thomassen, Tor Oskar; Winther, Andreas Kjæreng; Sagelv, Edvard Hamnvik; Pedersen, Sigurd; Hammer, Tord; Heitmann, Kim Arne; Olsen, Odd-Egil; Welde, Boye (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-07-14)
      The aim of this study was to investigate the effect of prolonged ski racing using skating style on technique choice in a transition section among female and male high-level skiers. Fifty three national-to-elite level skiers (20 females: 26.7 ± 4.8 years, 167.0 ± 6.5 m, 61.0 ± 5.1 kg, and 75.5 ± 68.8 FIS points; 33 males: 25.2 ± 3.5 years, 179.0 ± 5.2 cm, 73.1 ± 5.7 kg, and 73.7 ± 63.2 FIS points) ...
    • Training and influence of maximal strength in football players - With specific emphasis on females 

      Pedersen, Sigurd (Doctoral thesis; Doktorgradsavhandling, 2021-11-26)
      Participation and interest in female football is rising. Football is considered a complex sport, where technical, tactical, and physiological traits are suggested to impact the players´ ability to perform. However, most research on physical testing and training prescription derives from males. Although research is emerging on the match demands of female football, how underlying physiological or ...
    • The variability of physical match demands in elite women's football 

      Matias Do Vale Baptista, Ivan Andre; Winther, Andreas Kjæreng; Johansen, Dag; Bredsgaard Randers Thomsen, Morten; Pedersen, Sigurd; Pettersen, Svein Arne (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-01-21)
      Peak locomotor demands are considered as key metrics for conditioning drills prescription and training monitoring. However, research in female football has focused on absolute values when reporting match demands, leading to sparse information being provided regarding the degrees of variability of such metrics. Thus, the aims of this study were to investigate the sources of variability of match ...