Browsing NTNU Open by Author "Øvretveit, Karsten"
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Achievement goal profiles, and perceptions of motivational climate and physical ability in male Brazilian jiu-jitsu practitioners
Øvretveit, Karsten; Sæther, Stig Arve; Mehus, Ingar (Journal article; Peer reviewed, 2018)Background and Study Aim: Brazilian jiu-jitsu (BJJ) is a martial art with high rates of attrition. At present, little is known about the achievement goals of martial arts practitioners, particularly in BJJ. Thus, our aim ... -
Achievement goal profiles, and perceptions of motivational climate and physical ability in male Brazilian jiu-jitsu practitioners
Øvretveit, Karsten; Sæther, Stig Arve; Mehus, Ingar (Journal article; Peer reviewed, 2018)Background and Study Aim: Brazilian jiu-jitsu (BJJ) is a martial art with high rates of attrition. At present, little is known about the achievement goals of martial arts practitioners, particularly in BJJ. Thus, our aim ... -
Acute physiological and perceptual responses to Brazilian jiu-jitsu sparring: the role of maximal oxygen uptake
Øvretveit, Karsten (Journal article; Peer reviewed, 2018)Sparring is a training form in combat sports designed to simulate fighting. This study sought to assess physiological and perceptual responses to Brazilian jiu-jitsu (BJJ) sparring and their relationship with maximal oxygen ... -
Aerobic interval training improves maximal oxygen uptake and reduces body fat in grapplers
Øvretveit, Karsten (Journal article; Peer reviewed, 2019)BACKGROUND: Despite regularly engaging in high-intensity grappling, Brazilian jiu-jitsu (BJJ) athletes have a moderate maximal oxygen uptake (V̇O2max). The aim of this study was to evaluate the efficacy and feasibility of ... -
Anthropometric and Physiological Characteristics of Brazilian Jiu-Jitsu Athletes
Øvretveit, Karsten (Journal article; Peer reviewed, 2018)Øvretveit, K. Anthropometric and physiological characteristics of Brazilian jiu-jitsu athletes. J Strength Cond Res 32(4): 997–1004, 2018—The aim of this study was to describe anthropometric and physiological characteristics ... -
Anthropometric, physiological, and psychological characteristics of Brazilian jiu-jitsu athletes - A cross-sectional study
Øvretveit, Karsten (Master thesis, 2018)Brazilian jiu-jitsu (BJJ) is a modern martial art with roots in Japan and Brazil. Despite growing popularity, there is a paucity of studies on the sport and its athletes. Thus, the aim of this study was to determine ... -
Can there be two speeds in a clean peloton? Performance strategies in modern road cycling
Øvretveit, Karsten (Journal article; Peer reviewed, 2024) -
Capacity and confidence: What can be gleaned from the link between perceived and actual physical ability in Brazilian jiu-jitsu practitioners?
Øvretveit, Karsten (Peer reviewed; Journal article, 2020)Among the many modern iterations of grappling-based combat sports, Brazilian jiu-jitsu (BJJ) has emerged as one of the most popular. In addition to its well-established effectiveness in competition, it is considered to be ... -
Evolusjonær eller epistemisk diskordans? Steinalderdiettens mange ansikt
Øvretveit, Karsten (Peer reviewed; Journal article, 2022)Steinalderdietten er en populær alternativ diett inspirert av teorier om hva våre forfedre spiste før neolittisk tid. Den baserer seg på en antatt uoverensstemmelse mellom menneskets gener og våre moderne omgivelser, noe ... -
Evolutionary or epistemic discordance? Analyzing the Paleolithic diet through the lens of the quantified self
Øvretveit, Karsten (Master thesis, 2022)Bakgrunn: Næringsinntak er en viktig og vedvarende eksponering i menneskers liv og spiller en sentral rolle i helse og sykdom. Økt forståelse for de betydelige fysiologiske effektene kostholdsendringer kan føre til har ... -
Exiting the Cave: Exploring the Transition From Paleolithic to Omnivorous Dieting
Øvretveit, Karsten; Mehus, Ingar (Peer reviewed; Journal article, 2022)This is a follow-up of a recent case study of the Paleolithic diet that investigates dietary changes, including energy intake, food sources, and macronutrient and micronutrient distribution, associated with a transition ... -
Helsetjenestekostnader ved overvekt og fedme på individnivå versus populasjonsnivå – en HUNT-studie
Edwards, Christina Hansen; Bjørnelv, Gudrun Maria Waaler; Øvretveit, Karsten; Hveem, Kristian; Bjørngaard, Johan Håkon (Peer reviewed; Journal article, 2023)BAKGRUNN Måten forskningsresultater blir presentert på, påvirker hvordan resultatene blir tolket. Vi viser betydningen av å presentere sammenhengen mellom kroppsmasseindeks (BMI) og helsetjenestekostnader både fra et ... -
Mastery goals are associated with training effort in Brazilian jiu-jitsu
Øvretveit, Karsten; Sæther, Stig Arve; Mehus, Ingar (Journal article; Peer reviewed, 2019)Problem statement: Brazilian jiu-jitsu (BJJ) is a grappling-based combat sport with a high attrition rate. Central to BJJ training is simulated competition in the form of sparring, which may have implications for athlete ... -
Maximal strength training improves strength performance in grapplers
Øvretveit, Karsten; Tøien, Tiril (Journal article; Peer reviewed, 2018)The aim of this study was to assess the short-term effects of maximal strength training (MST) as an accessory to grappling training on strength performance in competitive Brazilian Jiu-Jitsu (BJJ) athletes. Fourteen male ... -
Mechanisms and trainability of peripheral fatigue in grappling
Øvretveit, Karsten; Laginestra, Fabio Giuseppe (Journal article, 2021)Grappling is an ancient form of unarmed combat that has evolved into several distinct combat sports, such as wrestling, judo, and Brazilian jiu-jitsu. Despite different styles and rulesets, these sports share several ... -
Metabolske og moralske effekter av eksogene ketoner
Øvretveit, Karsten (Peer reviewed; Journal article, 2023)Ketoner, eller ketonlegemer, omtales vanligvis i forbindelse med ketogene dietter og blir av enkelte beskrevet som et fjerde makronæringsstoff på bakgrunn av sine energigivende egenskaper. De siste årene har ketoner i ... -
Polygenic risk scores associate with blood pressure traits across the lifespan
Øvretveit, Karsten; Ingeström, Emma Maria Lovisa; Spitieris, Michail; Tragante, Vinicius; Wade, Kaitlin Hazel; Thomas, Laurent Francois; Wolford, Brooke Nichole; Wisløff, Ulrik; Gudbjartsson, Daníel Fannar; Hólm, Hilma Asbjørn; Stefánsson, Kári; Brumpton, Ben Michael; Hveem, Kristian (Peer reviewed; Journal article, 2023)Aims Hypertension is a major modifiable cause of morbidity and mortality that affects over 1 billion people worldwide. Blood pressure (BP) traits have a strong genetic component that can be quantified with polygenic risk ... -
Position before submission? Techniques and tactics in competitive no-gi Brazilian jiu-jitsu
Spanias, Charalampos; Kirk, Christopher; Øvretveit, Karsten (Peer reviewed; Journal article, 2022)Brazilian jiu-jitsu (BJJ) is a grappling-based combat sport performed either with a traditional uniform, the gi, or without, known as no-gi. Differences between the two when it comes to gripping, pace, and ruleset can ... -
Post-Exercise Hypotension in Brazilian Jiu-Jitsu
Belo, Wesley Rodrigues; de Castro, Lucas Fenta; Palmieri, Diego Cesar; dos Santos, Luiz Gustavo Dias; Herrera-Valenzuela, Tomás; dos Santos, Marco Antonio Ferreira; Øvretveit, Karsten; Simão, Roberto (Peer reviewed; Journal article, 2020)Hypertension is a leading preventable cause of morbidity and mortality worldwide. Exercise is a widely recommended treatment strategy that has been shown to cause both acute and chronic reductions in blood pressure. This ... -
The Quantified Caveman: A Yearlong Case Study of the Paleolithic Diet
Øvretveit, Karsten (Peer reviewed; Journal article, 2022)This is a detailed study of nutritional and lifestyle data on a single individual who adhered to the Paleolithic diet (PD) for a full year. The dietary intake was compared with evidence-based guidelines and various PD ...