Browsing Norges idrettshøgskole by Subject "biomechanics"
Now showing items 1-20 of 26
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50 m freestyle in 21, 22 and 23 s: What differentiates the speed curve of world-class and elite male swimmers?
(Peer reviewed; Journal article, 2021)We examined the association between 50 m freestyle performance (50FS) and average speed (AS), peak speed (PS), minimum speed (MS) and intracyclic speed variation (ISV) and compared the speed curves from swimmers with ... -
Altered hip control during a standing knee‐lift test is associated with increased risk of knee injuries
(Peer reviewed; Journal article, 2020)A few prospective studies have investigated hip and pelvic control as a risk factor for lower extremity (LE) injuries. The purpose of this study was to investigate whether deficits in hip and lumbopelvic control during ... -
Analysis of a severe head injury in world cup alpine skiing
(Journal article; Peer reviewed, 2015-06)Traumatic brain injury (TBI) is the leading cause of death in alpine skiing. It has been found that helmet use can reduce the incidence of head injuries between 15% and 60%. However, knowledge on optimal helmet performance ... -
Analysis of ball carrier head motion during a rugby union tackle without direct head contact: A case study
(Peer reviewed; Journal article, 2019)Rugby union players can be involved in many tackles per game. However, little is known of the regular head loadingenvironment associated with tackling in rugby union. In particular, the magnitude and influencing factors ... -
Arm–leg coordination during the underwater pull-out sequence in the 50, 100 and 200 m breaststroke start
(Peer reviewed; Journal article, 2022)Objectives: To investigate the arm–leg coordination from different perspectives of motor control during the underwater start sequence to understand whether differences exist between the three competitive breaststroke ... -
Arm–Leg coordination profiling during the dolphin kick and the arm pull-out in elite breaststrokers
(Peer reviewed; Journal article, 2021)In breaststroke races, the dolphin kick could finish before, at the same time, or during the arm pull-out, but it is unclear how swimmers perform this technique. The aim of this study was to investigate whether swimmers ... -
Athletes with high knee abduction moments show increased vertical center of mass excursions and knee valgus angles across sport-specific fake-and-cut tasks of different complexities
(Peer reviewed; Journal article, 2022)Young female handball players represent a high-risk population for anterior cruciate ligament (ACL) injuries. While the external knee abduction moment (KAM) is known to be a risk factor, it is unclear how cutting technique ... -
Between-limb symmetry in ACL and tibiofemoral contact forces in athletes after ACL reconstruction and clearance for return to sport
(Peer reviewed; Journal article, 2022)Background: Current return-to-sport (RTS) criteria after anterior cruciate ligament (ACL) reconstruction (ACLR) include demonstrating symmetry in functional and strength tests. It remains unknown if at the time that athletes ... -
Body roll amplitude and timing in backstroke swimming and their differences from front crawl at the same swimming intensities
(Peer reviewed; Journal article, 2021)The current study investigated body roll amplitude and timing of its peak in backstroke and compared them with front crawl swimming. Nineteen anatomical landmarks were digitised using 80 swimming trial videos (ten ... -
Change of direction biomechanics in a 180-degree pivot turn and the risk for noncontact knee injuries in youth basketball and floorball players
(Peer reviewed; Journal article, 2021)Background: Studies investigating biomechanical risk factors for knee injuries in sport-specific tasks are needed.Purpose:To investigate the association between change of direction (COD) biomechanics in a 180-degree pivot ... -
Comparing active, passive, and combined warm-ups among junior alpine skiers in -7°C
(Peer reviewed; Journal article, 2021)Context: Warming up in very cold climates and maintaining an elevated body temperature prior to a race is challenging for snow-sport athletes. Purpose: To investigate the effects of active (ACT), passive (PAS), and a ... -
Differential contributions of ankle plantarflexors during submaximal isometric muscle action: a PET and EMG study
(Journal article; Peer reviewed, 2014-06)The objective of this study was to investigate the relative contributions of superficial and deep ankle plantarflexors during repetitive submaximal isometric contractions using surface electromyography (SEMG) and positron ... -
Enhancing digital video analysis of bar kinematics in weightlifting: a case study
(Journal article; Peer reviewed, 2017)Weightlifting technique can be objectively assessed from two-dimensional video recordings. Despite its importance, participants’ bar trajectories in research involving the snatch or clean exercises are often not reported, ... -
Filtering affects the calculation of the largest Lyapunov exponent
(Peer reviewed; Journal article, 2020)The calculation of the largest Lyapunov exponent (LyE) requires the reconstruction of the time series in an N-dimensional state space. For this, the time delay (Tau) and embedding dimension (EmD) are estimated using the ... -
The gold rush in para swimming: changes in the speed curve of a visually impaired world and paralympic champion–a case study
(Peer reviewed; Journal article, 2023)This case study examined the association between 50 m freestyle and speed curve parameters of a world-class Paralympic swimmer and analysed the changes in speed curves and their frequency components across her performance ... -
Lower patellofemoral joint contact force during side-step cutting after return-to-sports clearance following anterior cruciate ligament reconstruction
(Peer reviewed; Journal article, 2023)Background: Low patellofemoral joint (PFJ) contact force has been associated with PFJ osteoarthritis. Quadriceps force and knee flexion angles, which are typically altered after an anterior cruciate ligament reconstruction ... -
Muscle coordination, activation and kinematics of world-class and elite breaststroke swimmers during submaximal and maximal efforts
(Journal article; Peer reviewed, 2016-07-25)The aims of this study were to describe muscular activation patterns and kinematic variables during the complete stroke cycle (SC) and the different phases of breaststroke swimming at submaximal and maximal efforts. Surface ... -
No effects of a 12-week supervised exercise therapy program on gait in patients with mild tomoderate osteoarthritis: a secondary analysis of a randomized trial
(Journal article; Peer reviewed, 2015-03-05)Background: It is unknown whether gait biomechanics in hip osteoarthritis patients with mild to moderate symptoms change following exercise therapy interventions. The aim of the present study was to compare stance phase ... -
Plantarflexor muscle function in healthy and chronic Achilles tendon pain subjects evaluated by the use of EMG and PET imaging
(Journal article; Peer reviewed, 2014-05)Achilles tendon pathologies may alter the coordinative strategies of synergistic calf muscles. We hypothesized that both surface electromyography and positron emission tomography would reveal differences between symptomatic ... -
Rehabilitation after anterior cruciate ligament injury influences joint loading during walking but not hopping
(Journal article; Peer reviewed, 2009-03-08)Objective: The purpose of this study was to identify changes in clinical outcome and lower extremity biomechanics during walking and hopping in ACL-injured subjects before and after a 20-session neuromuscular and strength ...