Ola Eriksrud

• Petway, Adam J.; Harper, Damian; Cohen, Daniel & Eriksrud, Ola (2026). Factors differentiating change of direction performance in NCAA power 4 male basketball athletes. International journal of sports science & coaching. ISSN 1747-9541. 21(1), s. 321–328. doi: 10.1177/17479541251360509. Fulltekst i vitenarkiv
• Petway, Adam J.; Harper, Damian; Cohen, Daniel & Eriksrud, Ola (2026). Influence of maximal linear deceleration on lateral deceleration and shuffle performance in NCAA power 4 basketball athletes. International journal of sports science & coaching. ISSN 1747-9541. doi: 10.1177/17479541261432362. Fulltekst i vitenarkiv
• Müller-Kühnle, Julian; Bill, Kevin; Thun, Patrik; Mai, Patrick; Bagehorn, Timo & Kamatsuki, Yusuke [Vis alle 18 forfattere av denne artikkelen] (2025). A Novel Cutting Technique and Resistance Training Intervention to Improve Movement Patterns in Youth Female Handball Players. Journal of Orthopaedic & Sports Physical Therapy Open (JOSPT Open). 3(4), s. 473–482. doi: 10.2519/josptopen.2025.0144. Fulltekst i vitenarkiv Vis sammendrag

  OBJECTIVE: To assess whether a 9-week intervention combining cutting technique retraining and hip/calf resistance exercises reduced knee abduction moment (KAM) in young female handball players. STUDY DESIGN: Controlled laboratory study. METHODS: Forty female players (aged 15-18 years) were assigned to an intervention group (IG; n = 20) or control group (CG; n = 20). KAM during sidestep cutting and isometric strength were assessed preintervention and postintervention. The IG completed a twice-weekly program integrated into team practice. RESULTS: Group × time interaction was not significant for KAM ( P = .366) or foot strike angle (FSA; P = .171). Both groups reduced KAM ( P = .002; IG: 0.68 ± 0.16 to 0.59 ± 0.21 Nm/kg*m; CG: 0.68 ± 0.31 to 0.53 ± 0.22 Nm/kg*m) and increased FSA ( P = .040). Knee valgus angle showed no significant interaction ( P = .462) or main effects ( P = .148, P = .080). There was no interaction for hip external rotation, hip abduction, or ankle plantarflexion strength ( P≥.05). Hip abduction strength increased over time ( P = .046) without group differences. CONCLUSION: The intervention did not significantly improve KAM or strength versus standard training, though trends suggest possible effects on cutting mechanics. JOSPT Open 2025;3(4):473-482. Epub 20 August 2025. doi:10.2519/josptopen.2025.0144

• Harper, Damian J.; Philipp, Nicolas M.; Eriksrud, Ola; Jones, Paul A.; Graham-Smith, Philip & Dos’Santos, Thomas (2025). Assessing Deceleration Performance: Methodological and Practical Considerations. Sports Medicine. ISSN 0112-1642. 56. doi: 10.1007/s40279-025-02339-7. Fulltekst i vitenarkiv
• Bill, Kevin; Bartsch, Julia; Willwacher, Steffen; Eriksrud, Ola; Mausehund, Lasse & Kersting, Uwe [Vis alle 8 forfattere av denne artikkelen] (2025). Same Same but Different: Why Both Sport-Specific Cutting Tasks and Generic Change-of-Direction Tasks Might Need to Be Considered to Prevent ACL Injury. Journal of Orthopaedic & Sports Physical Therapy Open (JOSPT Open). 3(2), s. 162–170. doi: 10.2519/josptopen.2024.0076. Fulltekst i vitenarkiv Vis sammendrag

  OBJECTIVES: To compare knee abduction moment (KAM) magnitudes between a generic 180° pivot turn (modified 505 change-of-direction test [m505]) and a handball-specific sidestep cut, to assess ranking consistency, and to examine the resultant ground reaction force (GRF) and its frontal plane moment arm to the knee to comprehend their contributions to KAM. STUDY DESIGN: Observational laboratory study. METHODS: High-level female handball players (n = 45) performed the m505 and the handball-specific sidestep cut. The resultant GRF and its frontal plane moment arm to the knee as well as KAM were obtained and subsequently compared between tasks. Rank correlation coefficients were employed to assess if the variables of both tasks were related. RESULTS: Peak KAM was similar for the m505 and the sidestep cut (median [range], 1.79 [0.95-3.53] Nm/kg vs 1.64 [0.34-3.60] Nm/kg; r b = .25; P = .14). The ranking of the players’ peak KAM differed substantially ( r s = .26; P = .084), suggesting that different tasks could classify the same player with different injury risk. The m505 generated lower resultant GRFs (24 ± 4 N/kg, 95% CI [23, 24] vs 33 ± 9 N/kg, 95% CI [31, 35]; d = 1.30; P<.001) but longer frontal plane moment arms (7.8 ± 1.8 cm, 95% CI [7.3, 8.4] vs 5.4 ± 1.5 cm, 95% CI [5.0, 5.8]; d = 1.36; P<.001) compared to those generated by the sidestep cut. CONCLUSION: A difference in individual anterior cruciate ligament injury risk assessment depending on movement type was revealed. While KAM magnitudes were similar across direction-change tasks, player rankings differed. The contributions of resultant GRF and frontal plane moment arms to peak KAM varied between tasks, underscoring the importance of task-specific and individualized injury prevention. JOSPT Open 2025;3(2):162-170. Epub 4 December 2024. doi:10.2519/josptopen.2024.0076

• Paulsen, Gøran; Lindberg, Kolbjørn Andreas; Eriksrud, Ola; Solberg, Paul Andre; Bjørnsen, Thomas & Seynnes, Olivier R. [Vis alle 9 forfattere av denne artikkelen] (2025). Is the Classification of Athletes Based on Force-Velocity Profiling from Countermovement Jumps Influenced by the Choice of Method? Medicine & Science in Sports & Exercise. ISSN 0195-9131. 57(9), s. 1968–1978. doi: 10.1249/MSS.0000000000003732. Fulltekst i vitenarkiv Vis sammendrag

  Purpose Force–velocity (FV) profiling is a tool for classifying athletes as force- or velocity-deficient, allowing for tailored training prescriptions. However, profiling classification may vary depending on the measurement method used. This study compared FV profile variables derived from countermovement jumps (CMJs) using four approaches: the Flight-time method, a Kinetic method, and two kinematic methods. Methods Sixteen National-level female handball players completed CMJs with 0, 20, 40, 50, and 70 kg of additional mass. All jumps were recorded by a force plate and 3D motion capture system. For each jump, jump height, height of push-off (HPO), average force, and average velocity were estimated, and FV profiles were derived using each of the four methods. The two kinematic methods represented displacement of the center of mass of 1) the body and 2) the whole system (i.e., body + additional mass). A pre-measured HPO (Flight-time method) overestimated the HPO derived from kinetic and kinematic methods at low values and underestimated it at high values. Results The Flight-time method underestimated average force by 7% compared to the Kinetic method and overestimated it by 1–3% compared to the kinematic methods. Average velocity during push-off was lower when derived from the Flight-time method than all other methods, particularly at the highest velocities (~20%). The resultant FV profiles (slopes) differed systematically by 30–39% between methods, such that >80% of participants were classified differently (i.e., force-deficient, velocity-deficient, or balanced) depending on the method applied. Conclusions We question the practical use of the FV profiles based on the Flight-time method, as it could result in the misclassification of athletes.

• Eriksrud, Ola & Westheim, Frederic (2025). Test-retest and intrasession reliability of assisted sprint outcome measurements using a motorized resistance device. Frontiers in Sports and Active Living. 7. doi: 10.3389/fspor.2025.1592707. Fulltekst i vitenarkiv Vis sammendrag

  The aim of this study was to determine reliability of assisted sprint outcome measurements using a motorized resistance device (MRD). A total of 21 participants (16 males and 5 females; age 22.3 ± 3.9 years, body mass 75.2 ± 6.9 kg, height 177.9 ± 6.8 cm) completed two assisted sprint tests on four different test sessions while exposed to an external load (3 kg) provided by the MRD. Outcome variables included time, top speed, maximum acceleration and 5 m split times and speeds. Intrasession and test-retest reliability was assessed using intraclass correlation coefficient (ICC), coefficient of variation (CV), typical error (TE), smallest worthwhile (SWC) and moderate worthwhile change (MDC). For test-retest reliability mostly high to extremely high ICC values (>0.77), and good (<5%) CV values were observed for all outcome measurements. Specifically, all outcome measurements showed high to extremely high relative reliability (ICC ≥ 0.95) except 0–5 m time (0.86) and maximum acceleration (0.77). Good absolute reliability was observed for all outcome measurements (CV range: 0.9–3.7) except maximum acceleration (8.7). Furthermore, most outcome variables were rated as good and ok for SWC. Similar findings were observed for intrasession reliability with very high ICC values for all outcome measurements except maximum acceleration (0.85–0.93) and 0–5 time for session 2–4 (0.88–0.92). Similarly, CV was good for all outcome measurements for all sessions except maximum acceleration (5.7–5.9%). In addition, all outcome measurements had good to ok SWC, except for maximum acceleration. In conclusion, the present study shows that the MRD can obtain reliable assisted sprint outcome measurements and thereby provide coaches and researchers with new opportunities to advance, monitor and evaluate sprint training.

• Westheim, Frederic; Gløersen, Øyvind; Harper, Damian; Laugsand, Håkon Nilsen & Eriksrud, Ola (2023). Reliability of phase-specific outcome measurements in change-of-direction tests using a motorized resistance device. Frontiers in Sports and Active Living. 5. doi: 10.3389/fspor.2023.1212414. Fulltekst i vitenarkiv Vis sammendrag

  This study aims to determine test-retest reliability of phase-specific information during initial acceleration, deceleration, and re-acceleration phases of different change-of-direction (CoD) tests using a motorized resistance device (MRD). A total of 21 participants (16 males and five females, with mean age of 22.3 ± 3.9 years, body mass of 75.2 ± 6.9 kg, height of 177.9 ± 6.8 cm) completed the modified 505 (m505), 10-0-5, and 15-0-5 CoD tests on four different test sessions while exposed to an external load (3 kg) provided by the MRD. Outcome variables included overall and phase-specific kinetic (force, power, and impulse) and kinematic (time, distance, velocity, and acceleration/deceleration) data during the initial acceleration, deceleration, and re-acceleration phases. The deceleration and re-acceleration phases were further divided into two subphases, namely, early and late subphases, using 50% of maximum velocity. Reliability was assessed using an intraclass correlation coefficient (ICC), coefficient of variation (CV), typical error (TE), and minimal detectable change (MDC). Good to excellent ICC values (>0.75) and acceptable (<10%) to good (<5%) CV values were observed for most outcome measurements. Specifically, 80.1% (822 out of 1,026) of all variables showed good or better relative reliability (i.e., ICC ≥ 0.75), while 97.0% (995 out of 1,026) of all variables showed acceptable or better absolute reliability (i.e., CV < 10%). In conclusion, the present study demonstrates that the MRD can obtain reliable phase-specific outcome measurements across different CoD tests, providing coaches and researchers with new opportunities to advance our understanding of CoD ability and inform more advanced CoD training prescriptions.

Se alle arbeider i NVA

• Eriksrud, Ola; Krosshaug, Tron; Mai, Patrick; Glørsen, Øyvind & Westheim, Frederic (2024). Deceleration demands in change of direction tests: insights from measurements using a motorized resistance device. Fulltekst i vitenarkiv
• Mai, Patrick; Bill, Kevin; Kersting, Uwe; Willwacher, Steffen; Eriksrud, Ola & Krosshaug, Tron (2024). A nine-week ACL injury prevention program for female handball players: Effect on knee joint loading and cutting technique during a handball-specific fake-cut. Fulltekst i vitenarkiv

Se alle arbeider i NVA