Refine
Year of publication
Document Type
- Article (178)
- Postprint (92)
- Review (14)
- Other (7)
- Conference Proceeding (1)
Language
- English (292) (remove)
Keywords
- football (26)
- resistance training (18)
- adolescents (17)
- youth (15)
- balance (13)
- exercise (13)
- performance (11)
- stretch-shortening cycle (11)
- training (11)
- athletic performance (10)
- children (10)
- monitoring (10)
- muscle strength (10)
- strength training (10)
- training load (10)
- postural control (9)
- Exercise (8)
- Gait (8)
- elite athletes (8)
- gait (8)
- injury risk (8)
- power (8)
- strength (8)
- young athletes (8)
- electromyography (7)
- Stretch-shortening cycle (6)
- aging (6)
- muscle power (6)
- physical fitness (6)
- physiology (6)
- plyometric training (6)
- postural stability (6)
- Electromyography (5)
- Ground reaction force (5)
- force (5)
- injury (5)
- jumping (5)
- movement (5)
- periodization (5)
- plyometric exercise (5)
- recovery (5)
- sport-specific performance (5)
- striking combat sports (5)
- working memory (5)
- youth sports (5)
- Aging (4)
- Balance (4)
- EMG (4)
- Performance (4)
- Resistance training (4)
- Team sports (4)
- agility (4)
- change of direction (4)
- elderly (4)
- global positioning system (4)
- ground reaction force (4)
- human physical conditioning (4)
- inertial measurement unit (4)
- loading rate (4)
- muscle (4)
- physical performance (4)
- postural sway (4)
- rate of perceived exertion (4)
- rolling averages (4)
- running (4)
- sensitivity (4)
- soccer (4)
- speed (4)
- validity (4)
- weighted moving averages (4)
- Body composition (3)
- COVID-19 (3)
- EEG (3)
- Fatigue (3)
- Postural stability (3)
- Power (3)
- RPE (3)
- Seniors (3)
- Trunk muscle strength (3)
- Walking (3)
- Youth (3)
- adolescent (3)
- attentional demand (3)
- balance training (3)
- biomechanics (3)
- cardiorespiratory fitness (3)
- child (3)
- cognitive performance (3)
- cognitive-postural dual task (3)
- fatigue (3)
- gait analysis (3)
- ground reaction forces (3)
- hospitalization (3)
- maturation (3)
- maturity (3)
- modality compatibility (3)
- motor skills (3)
- musculoskeletal and neural physiological phenomena (3)
- oarsmen (3)
- on-water performance (3)
- overreaching (3)
- overtraining (3)
- peak height velocity (3)
- physical conditioning human (3)
- plyometrics (3)
- range of motion (3)
- rate of torque development (3)
- reliability (3)
- running mechanics (3)
- somatic variables (3)
- talent (3)
- youth soccer (3)
- ACWR (2)
- Acceleration (2)
- Acute Recovery and Stress Scale (ARSS) (2)
- Children (2)
- Cognitive fatigue (2)
- Cognitive interference (2)
- Cognitive/motor interference (2)
- Computer Software (2)
- Conditioning activity (2)
- Countermovement jump (2)
- Crossover (2)
- DXA (2)
- Daily life (2)
- Detraining (2)
- Exertion (2)
- Flat feet (2)
- Football (2)
- Footwear (2)
- Ginkgo biloba extract (2)
- Healthy aging (2)
- Injury risk (2)
- Jugendliche (2)
- Jump height (2)
- Kinder (2)
- Kinematics (2)
- Linear regression analysis (2)
- Maximalkraft (2)
- Mobility (2)
- Motion (2)
- Muscle (2)
- Muscle mass (2)
- Muscle strength (2)
- OptoGait (2)
- Overhead athletes (2)
- Physical fitness (2)
- Postural control (2)
- Principal component analysis (2)
- Proactive/reactive balance (2)
- RGB-D cameras (2)
- Recovery (2)
- Repeated sprint (2)
- Scanning electron microscopy (2)
- Schnellkraft (2)
- Short‐term effect (2)
- Shoulder (2)
- Single/dual tasking (2)
- Speed (2)
- Sport-specific performance (2)
- Steady-state balance (2)
- Stress levels (2)
- Sway (2)
- Swimming performance (2)
- Tiredness (2)
- Velocity (2)
- Widerstandstraining (2)
- Young swimmers (2)
- Zebris (2)
- academy (2)
- acute chronic workload ratio (2)
- aerobic metabolism (2)
- aerobic power (2)
- allometry (2)
- alpha-2 (2)
- ankles (2)
- anterior cruciate ligament (2)
- anthropometry (2)
- anxiety (2)
- apoptosis (2)
- balance strategy (2)
- barbell velocity (2)
- biological age (2)
- biological maturation (2)
- blood (2)
- blood sample (2)
- body density (2)
- body limbs (2)
- body shape (2)
- calcaneal eversion (2)
- canoe racing (2)
- cardiomyopathy (2)
- change of direction speed (2)
- change-of-direction speed (2)
- cognitive interference (2)
- cognitive/muscular fatigue (2)
- comparison of devices (2)
- concurrent training (2)
- conditioning activity (2)
- conditioning exercise (2)
- core strength (2)
- cross-education (2)
- data pipeline (2)
- depression (2)
- diabetes (2)
- diabetes mellitus (2)
- diabetic (2)
- digital health (2)
- drop jump (2)
- dual task (2)
- dual-task costs (2)
- early sport specialization (2)
- eccentric-plyometric (2)
- endurance performance (2)
- evaluation (2)
- exercise intervention (2)
- exercise test (2)
- exercise training (2)
- external load (2)
- external training load (2)
- eyedness (2)
- fMRI (2)
- feet (2)
- fitness tests (2)
- flat feet (2)
- footedness (2)
- force production (2)
- functional performance (2)
- gait analysis algorithm (2)
- gait speed (2)
- gender differences (2)
- hamstring muscles (2)
- heart rate (2)
- hematocrit (2)
- high-intensity-interval training (2)
- hip (2)
- hormones (2)
- human motion (2)
- immune system (2)
- internal load (2)
- jump performance (2)
- jump training (2)
- jumps (2)
- kinetics (2)
- knee joint angle (2)
- knee osteoarthritis (2)
- knees (2)
- late childhood (2)
- latency (2)
- laterality (2)
- limb overuse conditions (2)
- linear sprint (2)
- long-term (2)
- low-back-pain (2)
- lower limb mechanics (2)
- lower-extremity kinematics (2)
- martial arts (2)
- matched time (2)
- material fatigue (2)
- medial longitudinal arch (2)
- mental imagery (2)
- meta-analysis (2)
- methodological quality (2)
- miRNAs (2)
- mitochondrial adaptation (2)
- mobility disability (2)
- motion capture (2)
- motor-performance (2)
- muscle activation (2)
- muscle coactivation (2)
- muscle fitness (2)
- muscle metabolism (2)
- muscular endurance (2)
- muscular strength (2)
- of-direction speed (2)
- oxygen consumption (2)
- passive stretching (2)
- peak torque (2)
- pelvic alignment (2)
- pervasive healthcare (2)
- physical fitness expertise (2)
- physiological strain (2)
- postural balance (2)
- power training (2)
- prevention (2)
- public dataset (2)
- race time (2)
- randomized controlled-trial (2)
- responses (2)
- return-to-sport (2)
- rotation (2)
- rugby league players (2)
- schedule (2)
- scholastic demands (2)
- school baseball players (2)
- sensorimotor training (2)
- sex-differences (2)
- skeletal joints (2)
- specific assessment (2)
- specificity (2)
- sports (2)
- sprint (2)
- sprinting (2)
- sprints (2)
- stability (2)
- standing position (2)
- taekwondo electronic scoring system (2)
- taekwondo-specific testing (2)
- tasks (2)
- team sport (2)
- theta (2)
- time-efficient exercise (2)
- track and field (2)
- training adaptation (2)
- training intensity (2)
- twitch torque (2)
- unstable walkway (2)
- virus infection (2)
- water sports (2)
- weight lifting (2)
- weight loss (2)
- weight training (2)
- weightlifting (2)
- whole-body vibratoin (2)
- women (2)
- young soccer players (2)
- youth athletes (2)
- youth sport (2)
- Accelerometer (1)
- Alpha-2 (1)
- Association (1)
- Athlete testing (1)
- Attention (1)
- Balance Tests (1)
- Biomechanics (1)
- Bow leg (1)
- Central activation (1)
- Cognition motor (1)
- Cognitive enhancer (1)
- Cognitive skills (1)
- Core stability (1)
- Core strength (1)
- Cross-over fatigue (1)
- Crossover fatigue (1)
- Developmental gains (1)
- Dual tasks (1)
- EMOTIKON (1)
- EXERCISE (1)
- Elderly (1)
- Electric stimulation (1)
- Electroencephalography (EEG) (1)
- Electromyography (EMG) (1)
- Elite sports (1)
- Endocrine (1)
- Endurance (1)
- Executive function (1)
- Exhaustion (1)
- Explosive force production (1)
- Fall risk assessment (1)
- Falls (1)
- Field test (1)
- Flexibility (1)
- Force (1)
- Force production (1)
- Free moment (1)
- Functional magnetic resonance imaging (fMRI) (1)
- Gait biomechanics (1)
- Gait kinematics (1)
- Gait kinetics (1)
- Gym-based/home-based training (1)
- ICA (1)
- Instability (1)
- Intensity Dose -response relationship (1)
- Isokinetic (1)
- Judo-specific pulling movement (1)
- Jumping height (1)
- Keyage children (1)
- Kindergarten (1)
- Knee valgus (1)
- Knee valgus motion (1)
- Lateral jumps (1)
- Linear Mixed Models (1)
- Loading rate (1)
- Lower-extremity muscle power (1)
- MUSCLE (1)
- Maturation (1)
- Maximal isometric force (1)
- Maximal voluntary contraction (MVC) (1)
- Mental fatigue (1)
- Metabolism (1)
- Mild cognitive impairment (1)
- Motor function (1)
- Motor performance (1)
- Motor skills (1)
- Movement velocity (1)
- Multiple sclerosis (1)
- Muscle contraction (1)
- Muscle power (1)
- Muscle torque (1)
- Neural inhibition (1)
- Older-than-keyage children (1)
- Optojump system (1)
- Parkinson's disease (1)
- Pediatric gait (1)
- Performance gains (1)
- Physical Fitness (1)
- Physical performance (1)
- Plyometric exercise (1)
- Plyometrics (1)
- Post-activation potentiation (1)
- Postactivation potentiation (1)
- Postural Control (1)
- Postural balance (1)
- Power training (1)
- Primary school (1)
- Primary school children (1)
- Quadriceps muscle (1)
- Quadriceps strength (1)
- Quarantine (1)
- Reactive movement (1)
- Reflex (1)
- Sensorimotor training (1)
- Skill (1)
- Squat jump (1)
- Strength training (1)
- Stress (1)
- Theraband training (1)
- Theta (1)
- Transcranial magnetic brain stimulation (TMS) (1)
- Vertec device (1)
- WALKING (1)
- Walking speed (1)
- Work ability (1)
- activities (1)
- adolescent athletes (1)
- aerobic exercise (1)
- age (1)
- annual training (1)
- assessment (1)
- athlete testing (1)
- athlete. (1)
- athletes (1)
- athletic (1)
- attention (1)
- ball speed (1)
- ballistic training (1)
- blood lactate (1)
- bone (1)
- boys (1)
- causal mediation analysis (1)
- cognitive enhancer (1)
- cognitive function (1)
- cognitive skills (1)
- cognitive/motor interference (1)
- combat sports (1)
- congested calendar (1)
- core (1)
- deconditioning (1)
- detraining (1)
- directed acyclic graphs (1)
- dominant limb (1)
- dose response (1)
- electroencephalography (1)
- elite (1)
- endocrine (1)
- endurance (1)
- energetic systems (1)
- executive function (1)
- exercise prescription (1)
- exhaustion (1)
- explosive force production (1)
- fall risk assessment (1)
- field test (1)
- fitness (1)
- flat foot (1)
- flexibility (1)
- footwear (1)
- free moment (1)
- function (1)
- fundamental movement skill (1)
- gender (1)
- girls (1)
- hearing loss (1)
- high effect size (1)
- high-intensity interval training (1)
- impact loading (1)
- infection (1)
- injury prevention (1)
- instability resistance training (1)
- intermittent sport (1)
- intervention (1)
- jump (1)
- jump height (1)
- jump height/power (1)
- jump performances (1)
- jumping ability (1)
- kindergarten (1)
- knee (1)
- knee flexion angle (1)
- knee valgus angle (1)
- knee valgus motion (1)
- load carriage (1)
- load-velocity (1)
- load–velocity relationship (1)
- locomotor skill (1)
- maximal isometric contraction (1)
- maximal isometric torque (1)
- maximum voluntary contraction (1)
- metabolism (1)
- mild cognitive impairment (1)
- motivational climate (1)
- motor performance (1)
- motor skill (1)
- muscle activity (1)
- muscular power (1)
- myofascial (1)
- neuromuscular rolling (1)
- non-dominant limb (1)
- of daily living (1)
- optimal load (1)
- patients (1)
- performance gains (1)
- physical activity (1)
- physical activity program (1)
- physical fitness test (1)
- post-activation potentiation (1)
- preactivation (1)
- pressure (1)
- primary school (1)
- proactive/reactive balance (1)
- progression (1)
- proprioception (1)
- race (1)
- rate of force development (1)
- reactive movement (1)
- reflex (1)
- region/point elastic gym floor (1)
- relationship (1)
- relationships (1)
- running velocity (1)
- sedentary (1)
- self massage (1)
- self-massage therapy (1)
- self-myofascial release (1)
- seniors (1)
- sensory input (1)
- shoe (1)
- short latency response (1)
- shoulder strength (1)
- single/dual tasking (1)
- ski jumping (1)
- skill (1)
- soccer players (1)
- sport profile (1)
- static/dynamic postural control (1)
- steady-state balance (1)
- stroke (1)
- structured (1)
- task difficulty (1)
- tendon stiffness (1)
- test-retest reliability (1)
- time (1)
- torque (1)
- training intervention (1)
- training specificity (1)
- vertical jump height (1)
- vestibular (1)
- virus (1)
- walking (1)
- walking capacity (1)
- walking speed (1)
- work (1)
- work-rate distribution (1)
- young (1)
- young adults (1)
Institute
- Department Sport- und Gesundheitswissenschaften (129)
- Strukturbereich Kognitionswissenschaften (104)
- Humanwissenschaftliche Fakultät (22)
- Extern (17)
- Department Psychologie (9)
- Hasso-Plattner-Institut für Digital Engineering GmbH (6)
- Fakultät für Gesundheitswissenschaften (3)
- Mathematisch-Naturwissenschaftliche Fakultät (3)
- Fachgruppe Soziologie (1)
Purpose
The objective of the investigation was to determine the concomitant effects of upper arm blood flow restriction (BFR) and inversion on elbow flexors neuromuscular responses.
Methods
Randomly allocated, 13 volunteers performed four conditions in a within-subject design: rest (control, 1-min upright position without BFR), control (1-min upright with BFR), 1-min inverted (without BFR), and 1-min inverted with BFR. Evoked and voluntary contractile properties, before, during and after a 30-s maximum voluntary contraction (MVC) exercise intervention were examined as well as pain scale.
Results
Inversion induced significant pre-exercise intervention decreases in elbow flexors MVC (21.1%, Z2p = 0.48, p = 0.02) and resting evoked twitch forces (29.4%, Z2p = 0.34, p = 0.03). The 30-s MVC induced significantly greater pre- to post-test decreases in potentiated twitch force (Z2p = 0.61, p = 0.0009) during inversion (75%) than upright (65.3%) conditions. Overall, BFR decreased MVC force 4.8% (Z2p = 0.37, p = 0.05). For upright position, BFR induced 21.0% reductions in M-wave amplitude (Z2p = 0.44, p = 0.04). There were no significant differences for electromyographic activity or voluntary activation as measured with the interpolated twitch technique. For all conditions, there was a significant increase in pain scale between the 40-60 s intervals and post-30-s MVC (upright< inversion, and without BFR< BFR).
Conclusion
The concomitant application of inversion with elbow flexors BFR only amplified neuromuscular performance impairments to a small degree. Individuals who execute forceful contractions when inverted or with BFR should be cognizant that force output may be impaired.
Gait analysis is an important tool for the early detection of neurological diseases and for the assessment of risk of falling in elderly people. The availability of low-cost camera hardware on the market today and recent advances in Machine Learning enable a wide range of clinical and health-related applications, such as patient monitoring or exercise recognition at home. In this study, we evaluated the motion tracking performance of the latest generation of the Microsoft Kinect camera, Azure Kinect, compared to its predecessor Kinect v2 in terms of treadmill walking using a gold standard Vicon multi-camera motion capturing system and the 39 marker Plug-in Gait model. Five young and healthy subjects walked on a treadmill at three different velocities while data were recorded simultaneously with all three camera systems. An easy-to-administer camera calibration method developed here was used to spatially align the 3D skeleton data from both Kinect cameras and the Vicon system. With this calibration, the spatial agreement of joint positions between the two Kinect cameras and the reference system was evaluated. In addition, we compared the accuracy of certain spatio-temporal gait parameters, i.e., step length, step time, step width, and stride time calculated from the Kinect data, with the gold standard system. Our results showed that the improved hardware and the motion tracking algorithm of the Azure Kinect camera led to a significantly higher accuracy of the spatial gait parameters than the predecessor Kinect v2, while no significant differences were found between the temporal parameters. Furthermore, we explain in detail how this experimental setup could be used to continuously monitor the progress during gait rehabilitation in older people.
Gait analysis is an important tool for the early detection of neurological diseases and for the assessment of risk of falling in elderly people. The availability of low-cost camera hardware on the market today and recent advances in Machine Learning enable a wide range of clinical and health-related applications, such as patient monitoring or exercise recognition at home. In this study, we evaluated the motion tracking performance of the latest generation of the Microsoft Kinect camera, Azure Kinect, compared to its predecessor Kinect v2 in terms of treadmill walking using a gold standard Vicon multi-camera motion capturing system and the 39 marker Plug-in Gait model. Five young and healthy subjects walked on a treadmill at three different velocities while data were recorded simultaneously with all three camera systems. An easy-to-administer camera calibration method developed here was used to spatially align the 3D skeleton data from both Kinect cameras and the Vicon system. With this calibration, the spatial agreement of joint positions between the two Kinect cameras and the reference system was evaluated. In addition, we compared the accuracy of certain spatio-temporal gait parameters, i.e., step length, step time, step width, and stride time calculated from the Kinect data, with the gold standard system. Our results showed that the improved hardware and the motion tracking algorithm of the Azure Kinect camera led to a significantly higher accuracy of the spatial gait parameters than the predecessor Kinect v2, while no significant differences were found between the temporal parameters. Furthermore, we explain in detail how this experimental setup could be used to continuously monitor the progress during gait rehabilitation in older people.
The purpose of this study was to examine the test-retest reliability, and convergent and discriminative validity of a new taekwondo-specific change-of-direction (COD) speed test with striking techniques (TST) in elite taekwondo athletes. Twenty (10 males and 10 females) elite (athletes who compete at national level) and top-elite (athletes who compete at national and international level) taekwondo athletes with an average training background of 8.9 ± 1.3 years of systematic taekwondo training participated in this study. During the two-week test-retest period, various generic performance tests measuring COD speed, balance, speed, and jump performance were carried out during the first week and as a retest during the second week. Three TST trials were conducted with each athlete and the best trial was used for further analyses. The relevant performance measure derived from the TST was the time with striking penalty (TST-TSP). TST-TSP performances amounted to 10.57 ± 1.08 s for males and 11.74 ± 1.34 s for females. The reliability analysis of the TST performance was conducted after logarithmic transformation, in order to address the problem of heteroscedasticity. In both groups, the TST demonstrated a high relative test-retest reliability (intraclass correlation coefficients and 90% compatibility limits were 0.80 and 0.47 to 0.93, respectively). For absolute reliability, the TST’s typical error of measurement (TEM), 90% compatibility limits, and magnitudes were 4.6%, 3.4 to 7.7, for males, and 5.4%, 3.9 to 9.0, for females. The homogeneous sample of taekwondo athletes meant that the TST’s TEM exceeded the usual smallest important change (SIC) with 0.2 effect size in the two groups. The new test showed mostly very large correlations with linear sprint speed (r = 0.71 to 0.85) and dynamic balance (r = −0.71 and −0.74), large correlations with COD speed (r = 0.57 to 0.60) and vertical jump performance (r = −0.50 to −0.65), and moderate correlations with horizontal jump performance (r = −0.34 to −0.45) and static balance (r = −0.39 to −0.44). Top-elite athletes showed better TST performances than elite counterparts. Receiver operating characteristic analysis indicated that the TST effectively discriminated between top-elite and elite taekwondo athletes. In conclusion, the TST is a valid, and sensitive test to evaluate the COD speed with taekwondo specific skills, and reliable when considering ICC and TEM. Although the usefulness of the TST is questioned to detect small performance changes in the present population, the TST can detect moderate changes in taekwondo-specific COD speed.
The purpose of this study was to examine the test-retest reliability, and convergent and discriminative validity of a new taekwondo-specific change-of-direction (COD) speed test with striking techniques (TST) in elite taekwondo athletes. Twenty (10 males and 10 females) elite (athletes who compete at national level) and top-elite (athletes who compete at national and international level) taekwondo athletes with an average training background of 8.9 ± 1.3 years of systematic taekwondo training participated in this study. During the two-week test-retest period, various generic performance tests measuring COD speed, balance, speed, and jump performance were carried out during the first week and as a retest during the second week. Three TST trials were conducted with each athlete and the best trial was used for further analyses. The relevant performance measure derived from the TST was the time with striking penalty (TST-TSP). TST-TSP performances amounted to 10.57 ± 1.08 s for males and 11.74 ± 1.34 s for females. The reliability analysis of the TST performance was conducted after logarithmic transformation, in order to address the problem of heteroscedasticity. In both groups, the TST demonstrated a high relative test-retest reliability (intraclass correlation coefficients and 90% compatibility limits were 0.80 and 0.47 to 0.93, respectively). For absolute reliability, the TST’s typical error of measurement (TEM), 90% compatibility limits, and magnitudes were 4.6%, 3.4 to 7.7, for males, and 5.4%, 3.9 to 9.0, for females. The homogeneous sample of taekwondo athletes meant that the TST’s TEM exceeded the usual smallest important change (SIC) with 0.2 effect size in the two groups. The new test showed mostly very large correlations with linear sprint speed (r = 0.71 to 0.85) and dynamic balance (r = −0.71 and −0.74), large correlations with COD speed (r = 0.57 to 0.60) and vertical jump performance (r = −0.50 to −0.65), and moderate correlations with horizontal jump performance (r = −0.34 to −0.45) and static balance (r = −0.39 to −0.44). Top-elite athletes showed better TST performances than elite counterparts. Receiver operating characteristic analysis indicated that the TST effectively discriminated between top-elite and elite taekwondo athletes. In conclusion, the TST is a valid, and sensitive test to evaluate the COD speed with taekwondo specific skills, and reliable when considering ICC and TEM. Although the usefulness of the TST is questioned to detect small performance changes in the present population, the TST can detect moderate changes in taekwondo-specific COD speed.
This study aimed to investigate the relationship between the acute to chronic workload ratio (ACWR), based upon participant session rating of perceived exertion (sRPE), using two models [(1) rolling averages (ACWRRA); and (2) exponentially weighted moving averages (ACWREWMA)] and the injury rate in young male team soccer players aged 17.1 ± 0.7 years during a competitive mesocycle. Twenty-two players were enrolled in this study and performed four training sessions per week with 2 days of recovery and 1 match day per week. During each training session and each weekly match, training time and sRPE were recorded. In addition, training impulse (TRIMP), monotony, and strain were subsequently calculated. The rate of injury was recorded for each soccer player over a period of 4 weeks (i.e., 28 days) using a daily questionnaire. The results showed that over the course of the study, the number of non-contact injuries was significantly higher than that for contact injuries (2.5 vs. 0.5, p = 0.01). There were also significant positive correlations between sRPE and training time (r = 0.411, p = 0.039), ACWRRA (r = 0.47, p = 0.049), and ACWREWMA (r = 0.51, p = 0.038). In addition, small-to-medium correlations were detected between ACWR and non-contact injury occurrence (ACWRRA, r = 0.31, p = 0.05; ACWREWMA, r = 0.53, p = 0.03). Explained variance (r²) for non-contact injury was significantly greater using the ACWREWMA model (ranging between 21 and 52%) compared with ACWRRA (ranging between 17 and 39%). In conclusion, the results of this study showed that the ACWREWMA model is more sensitive than ACWRRA to identify non-contact injury occurrence in male team soccer players during a short period in the competitive season.
This study aimed to investigate the relationship between the acute to chronic workload ratio (ACWR), based upon participant session rating of perceived exertion (sRPE), using two models [(1) rolling averages (ACWRRA); and (2) exponentially weighted moving averages (ACWREWMA)] and the injury rate in young male team soccer players aged 17.1 ± 0.7 years during a competitive mesocycle. Twenty-two players were enrolled in this study and performed four training sessions per week with 2 days of recovery and 1 match day per week. During each training session and each weekly match, training time and sRPE were recorded. In addition, training impulse (TRIMP), monotony, and strain were subsequently calculated. The rate of injury was recorded for each soccer player over a period of 4 weeks (i.e., 28 days) using a daily questionnaire. The results showed that over the course of the study, the number of non-contact injuries was significantly higher than that for contact injuries (2.5 vs. 0.5, p = 0.01). There were also significant positive correlations between sRPE and training time (r = 0.411, p = 0.039), ACWRRA (r = 0.47, p = 0.049), and ACWREWMA (r = 0.51, p = 0.038). In addition, small-to-medium correlations were detected between ACWR and non-contact injury occurrence (ACWRRA, r = 0.31, p = 0.05; ACWREWMA, r = 0.53, p = 0.03). Explained variance (r 2) for non-contact injury was significantly greater using the ACWREWMA model (ranging between 21 and 52%) compared with ACWRRA (ranging between 17 and 39%). In conclusion, the results of this study showed that the ACWREWMA model is more sensitive than ACWRRA to identify non-contact injury occurrence in male team soccer players during a short period in the competitive season.
This study aimed to investigate the relationship between the acute to chronic workload ratio (ACWR), based upon participant session rating of perceived exertion (sRPE), using two models [(1) rolling averages (ACWRRA); and (2) exponentially weighted moving averages (ACWREWMA)] and the injury rate in young male team soccer players aged 17.1 ± 0.7 years during a competitive mesocycle. Twenty-two players were enrolled in this study and performed four training sessions per week with 2 days of recovery and 1 match day per week. During each training session and each weekly match, training time and sRPE were recorded. In addition, training impulse (TRIMP), monotony, and strain were subsequently calculated. The rate of injury was recorded for each soccer player over a period of 4 weeks (i.e., 28 days) using a daily questionnaire. The results showed that over the course of the study, the number of non-contact injuries was significantly higher than that for contact injuries (2.5 vs. 0.5, p = 0.01). There were also significant positive correlations between sRPE and training time (r = 0.411, p = 0.039), ACWRRA (r = 0.47, p = 0.049), and ACWREWMA (r = 0.51, p = 0.038). In addition, small-to-medium correlations were detected between ACWR and non-contact injury occurrence (ACWRRA, r = 0.31, p = 0.05; ACWREWMA, r = 0.53, p = 0.03). Explained variance (r 2) for non-contact injury was significantly greater using the ACWREWMA model (ranging between 21 and 52%) compared with ACWRRA (ranging between 17 and 39%). In conclusion, the results of this study showed that the ACWREWMA model is more sensitive than ACWRRA to identify non-contact injury occurrence in male team soccer players during a short period in the competitive season.
This study aimed to investigate the relationship between the acute to chronic workload ratio (ACWR), based upon participant session rating of perceived exertion (sRPE), using two models [(1) rolling averages (ACWRRA); and (2) exponentially weighted moving averages (ACWREWMA)] and the injury rate in young male team soccer players aged 17.1 ± 0.7 years during a competitive mesocycle. Twenty-two players were enrolled in this study and performed four training sessions per week with 2 days of recovery and 1 match day per week. During each training session and each weekly match, training time and sRPE were recorded. In addition, training impulse (TRIMP), monotony, and strain were subsequently calculated. The rate of injury was recorded for each soccer player over a period of 4 weeks (i.e., 28 days) using a daily questionnaire. The results showed that over the course of the study, the number of non-contact injuries was significantly higher than that for contact injuries (2.5 vs. 0.5, p = 0.01). There were also significant positive correlations between sRPE and training time (r = 0.411, p = 0.039), ACWRRA (r = 0.47, p = 0.049), and ACWREWMA (r = 0.51, p = 0.038). In addition, small-to-medium correlations were detected between ACWR and non-contact injury occurrence (ACWRRA, r = 0.31, p = 0.05; ACWREWMA, r = 0.53, p = 0.03). Explained variance (r²) for non-contact injury was significantly greater using the ACWREWMA model (ranging between 21 and 52%) compared with ACWRRA (ranging between 17 and 39%). In conclusion, the results of this study showed that the ACWREWMA model is more sensitive than ACWRRA to identify non-contact injury occurrence in male team soccer players during a short period in the competitive season.
Introduction:
In children, the impact of hearing loss on biomechanical gait parameters is not well understood. Thus, the objectives of this study were to examine three-dimensional lower limb joint torques in deaf compared to age-matched healthy (hearing) children while walking at preferred gait speed.
Methods:
Thirty prepubertal boys aged 8-14 were enrolled in this study and divided into a group with hearing loss (deaf group) and an age-matched healthy control. Three-dimensional joint torques were analyzed during barefoot walking at preferred speed using Kistler force plates and a Vicon motion capture system.
Results:
Findings revealed that boys with hearing loss showed lower joint torques in ankle evertors, knee flexors, abductors and internal rotators as well as in hip internal rotators in both, the dominant and non-dominant lower limbs (all p < 0.05; d = 1.23-7.00; 14-79%). Further, in the dominant limb, larger peak ankle dorsiflexor (p < 0.001; d = 1.83; 129%), knee adductor (p < 0.001; d = 3.20; 800%), and hip adductor torques (p < 0.001; d = 2.62; 350%) were found in deaf participants compared with controls.
Conclusion:
The observed altered lower limb torques during walking are indicative of unstable gait in children with hearing loss. More research is needed to elucidate whether physical training (e.g., balance and/or gait training) has the potential to improve walking performance in this patient group. (C) 2019 Elsevier Ltd. All rights reserved.