Search Results

You are looking at 1 - 10 of 46 items for :

  • "biomechanical load" x
  • Refine by Access: All Content x
Clear All
Restricted access

Does Delivery Length Impact Measures of Whole-Body Biomechanical Load During Pace Bowling?

Samuel J. Callaghan, Robert G. Lockie, Walter Yu, Warren A. Andrews, Robert F. Chipchase, and Sophia Nimphius

Cricket pace bowlers report a greater injury risk in comparison with other playing activities in cricket. 1 – 3 The increased injury risk has been linked to the potential for the adoption of more injury-susceptible techniques and high biomechanical loading experienced during the delivery stride

Open access

Construct Validity and Test–Retest Reliability of Hip Load Compared With Playerload During Football-Specific Running, Kicking, and Jumping Tasks

Erik Wilmes, Bram J.C. Bastiaansen, Cornelis J. de Ruiter, Riemer J.K. Vegter, Michel S. Brink, Hidde Weersma, Edwin A. Goedhart, Koen A.P.M. Lemmink, and Geert J.P. Savelsbergh

. When assessing physical loads endured by players, a distinction can be made between external and internal loads and between physiological loads and biomechanical loads. 2 In football, external loads are defined by player activities on the field, whereas internal loads consider the individual

Restricted access

Comparative Study of Plantar Pressure during Step Exercise in Different Floor Conditions

Rita Santos-Rocha and António Veloso

Mechanical load has been estimated during step exercise based on ground reaction force (GRF) obtained by force platforms. It is not yet accurately known whether these measures reflect foot contact forces once the latter depend on footwear and are potentially modified by the compliant properties of the step bench. The aim of the study was to compare maximal and mean plantar pressure (PP), and maximal GRF obtained by pressure insoles after performing seven movements both over two metal force platforms and over the step bench. Fifteen step-experienced females performed the movements at the cadences of 130 and 140 beats per minute. PP and GRF (estimated from PP) obtained for each floor condition were compared. Maximal PP ranged from 29.27 ± 9.94 to 47.07 ± 12.88 N/cm2 as for metal platforms, and from 28.20 ± 9.32 to 43.00 ± 13.80 N/cm2 as for the step bench. Mean PP ranged from 11.09 ± 1.62 to 14.32 ± 2.06 N/cm2 (platforms) and from 10.71 ± 1.54 to 14.22 ± 1.77 N/cm2 (step bench). GRF (normalized body weight) ranged from 1.43 ± 0.14 to 2.41 ± 0.24 BW (platforms) and from 1.38 ± 0.14 to 2.36 ± 0.19 BW (step bench). No significant statistical differences were obtained for most of the comparisons between the two conditions tested. The results suggest that metal force platform surfaces are suitable to assess mechanical load during this physical activity. The forces applied to the foot are similar to the softer step bench and the hard force platform surface. This may reflect the ability of the performers to adapt their movement patterns to normalize the impact forces in different floor conditions.

Restricted access

The Physiological, Physical, and Biomechanical Demands of Walking Football: Implications for Exercise Prescription and Future Research in Older Adults

Liam D. Harper, Adam Field, Liam D. Corr, and Robert J. Naughton

important to account for potential differences in the biomechanical load of walking football sessions when prescribing walking football as an exercise intervention. Nonetheless, the HR response to the sessions demonstrated relatively low variability (CV < 7.5%) and so it would appear that walking football

Restricted access

Inverse Dynamic Analysis of the Lower Extremities during Nordic Walking, Walking, and Running

Felix Stief, Frank I. Kleindienst, Josef Wiemeyer, Florian Wedel, Sebastian Campe, and Berthold Krabbe

Compared with walking (W), Nordic walking (NW) exhibits greater cardiopulmonary and cardiovascular benefits. Some authors conjecture that compared with W or running (R), NW imposes smaller mechanical loads on the musculoskeletal system. The purpose of the current study was to quantify any differences in joint loading of the lower extremities among NW, W, and R. Fifteen experienced adults participated. Kinematic and force measurements were combined using an inverse dynamics approach to yield joint moments. The results showed no biomechanical benefit of NW. Instead, NW involved greater knee joint loading just after heel strike compared with W. This was due to the longer steps and the higher sole angle during the first part of the stance phase. The sagittal and frontal plane moments were smaller for NW compared with R, but in the transverse plane, the ankle moments were greater in NW than in W or R. Based on these results, NW is not recommended as an exercise for persons who seek to reduce biomechanical loading of the lower extremities.

Restricted access

The Effect of a Knee Support on the Biomechanical Response of the Low Back

Yu Shu, Zongliang Jiang, Xu Xu, and Gary A. Mirka

Stooping and squatting postures are seen in a number of industries (e.g., agriculture, construction) where workers must work near ground level for extended periods of time. The focus of the current research was to evaluate a knee support device designed to reduce the biomechanical loading of these postures. Ten participants performed a series of sudden loading tasks while in a semisquat posture under two conditions of knee support (no support and fully supported) and two conditions of torso flexion (45 and 60°). A weight was released into the hands of the participants who then came to steady state while maintaining the designated posture. As they performed this task, the EMG responses of the trunk extensors (multifidus and erector spinae) were collected, both during the “sudden loading” phase of the trial as well as the steady weight-holding phase of the trial. As expected, the effects of torso flexion angle showed significant decreases in the activation of the multifidus muscles with greater torso angle (indicating the initiation of the flexion–relaxation response). Interestingly, the results showed that the knee support device had no effect on the activation levels of the sampled muscles, indicating that the loss of the degree of freedom from the ankle joint during the knee support condition had no impact on trunk extensor muscle response. The a priori concern with regard to these supports was that they would tend to focus loading on the low back and therefore would not serve as a potential ergonomic solution for these stooping/semisquatting tasks. Because the results of this study did not support this concern, further development of such an intervention is underway.

Restricted access

An Evaluation of Training Load Measures for Drills in Women’s Collegiate Lacrosse

Jennifer A. Bunn, Bradley J. Myers, and Mary K. Reagor

surveys related to athlete readiness, recovery, and difficulty of training. Objective measures provide information regarding physiological and biomechanical load taken on during a training session, whereas the subjective measures provide insight into the athlete’s psychological and physiological loading

Restricted access

Hamstring and Quadriceps Muscle Strength in Youth to Senior Elite Soccer: A Cross-Sectional Study Including 125 Players

Lasse Ishøi, Kasper Krommes, Mathias F. Nielsen, Kasper B. Thornton, Per Hölmich, Per Aagaard, Juan J.J. Penalver, and Kristian Thorborg

the transition from youth- to senior-level soccer may be particularly problematic in relation to hamstring muscle strain injuries. The physiological and biomechanical load demands, such as sprint running distance covered during matches, are known to increase gradually from the U-13 (260 m of sprinting

Restricted access

Seasonal Training Load and Wellness Monitoring in a Professional Soccer Goalkeeper

James J. Malone, Arne Jaspers, Werner Helsen, Brenda Merks, Wouter G.P. Frencken, and Michel S. Brink

high biomechanical loading may be missing from current monitoring strategies for practitioners 16 ; thus, future work should focus on creating and validating GK-specific loading variables. As this is a single-participant case study, it is difficult to generalize the findings of this study. Because the

Restricted access

High Match Load’s Relation to Decreased Well-Being During an Elite Women’s Rugby Sevens Tournament

Steven H. Doeven, Michel S. Brink, Barbara C.H. Huijgen, Johan de Jong, and Koen A.P.M. Lemmink

impact of HIR and PC on fatigue and general muscle soreness, respectively. This is crucial in the prevention of underperformance. Limitations and Future Research Limitation of the present study is that next to total distance, intensity, and match load, no biomechanical load indicators were measured. 28