scholarly journals The effects of lower-limb wearable resistance on sprint performance in high school American football athletes: A nine-week training study

2021 ◽  
pp. 174795412110034
Author(s):  
Erin H Feser ◽  
Christian Korfist ◽  
Kyle Lindley ◽  
Neil E Bezodis ◽  
Kenneth Clark ◽  
...  
Keyword(s):  
Lower Limb ◽  
American Football ◽  
Control Group ◽  
Maximal Velocity ◽  
Sprint Training ◽  
Post Intervention ◽  
Training Time ◽  
Sprint Running ◽  
Mass Load ◽  
Low Volume

Time constraints often result in the challenge to fit desired programming into training time allotments. Wearable resistance (WR) may be an option to optimise the training content in function of constrained training time. The purpose of this study was to determine the effects of a lower-limb WR sprint running training intervention on athlete speed capabilities following a nine-week off-season, low volume training period within a sample of American football high school athletes. Nineteen athletes completed pre- and post-intervention testing of two maximal effort 30 m sprints. Horizontal force-velocity mechanical profiling variables, sprint times, and maximal velocity were calculated from sprint running velocity data collected by a radar device. The athletes completed seventeen dedicated sprint training sessions during the off-season. The intervention (WR) group completed the sessions with 1% body mass load attached to the shanks (i.e. 0.50% body mass load on each limb). The control group completed the same training sessions unloaded. Post-intervention, no statistically significant between group differences were observed ( p > 0.05). However, athletes in both groups experienced increases in velocity measures following the sprint training. The greater adjusted mean theoretical maximal velocity scores ( p > 0.05; ES = 0.30) found for the WR group compared to the control group at post-intervention may suggest that WR amplifies the nuances of the training protocol itself. Coaches can consider using lower-limb WR training to increase in-session workloads during periods of low volume training but more research is needed to better understand to what extent WR training might provide an added value to optimise both the training content and planning, as well as the athlete’s training response in order to improve sprint running performance.

Individualized Training Based on Force–Velocity Profiling During Jumping in Ballet Dancers

2020 ◽  
Vol 15 (6) ◽  
pp. 788-794 ◽  
Author(s):  
Juan A. Escobar Álvarez ◽  
Juan P. Fuentes García ◽  
Filipe A. Da Conceição ◽  
Pedro Jiménez-Reyes
Keyword(s):  
Field Method ◽  
Important Variable ◽  
Control Group ◽  
Maximal Velocity ◽  
Post Intervention ◽  
Ballet Dancers ◽  
Maximal Force ◽  
New Findings ◽  
The Aesthetic ◽  
Experimental Group

Purpose: Ballet dancers are required to achieve performance feats such as exciting and dramatic elevations. Dancers with a greater jump height can perform a wider range of skills during their flight time and implement more specific technical skills related to the aesthetic components of a dance choreography. New findings suggest the relationship between force and velocity mechanical capabilities (F-V profile) as an important variable for jumping performance. A new field method based on several series of loaded vertical jumps provides information on the theoretical maximal force, theoretical maximal velocity, theoretical maximal power, and the imbalance between force and velocity (F-VIMB). The purpose of this study was to observe the effects of 9 wk of individualized F-V profile-based training during countermovement jumps (CMJs) in female ballet dancers. Methods: CMJ and mechanical outputs of 46 dancers (age = 18.9 [1.1] y, body mass = 54.8 [6.1] kg, height = 163.7 [8.4] cm) were estimated in a pre–post intervention. The control group (10 participants) continued with the standardized training regimen (no resistance training), whereas the experimental group (36 participants) performed 2 sessions over 9 wk of a training plan based on their F-V profile. Results: The experimental group presented significant differences with large effect sizes in CMJ height (29.3 [3.2] cm vs 33.5 [3.72] cm), theoretical maximal force (24.1 [2.2] N/kg vs 29.9 [2.8] N/kg), and theoretical maximal velocity (4 [0.6] m/s vs 3.2 [0.5] m/s). Significant differences with a very large effect size were found in F-VIMB (43.8% [15.3%] vs 24.9% [8.7%]). Conclusion: A training program addressing F-VIMB is an effective way to improve CMJ height in female ballet dancers.

scholarly journals The Effect of 16 Weeks of Lower-Limb Strength Training in Jumping Performance of Ballet Dancers

2022 ◽  
Vol 12 ◽  
Author(s):  
Lurdes Ávila-Carvalho ◽  
Filipe Conceição ◽  
Juan A. Escobar-Álvarez ◽  
Beatriz Gondra ◽  
Isaura Leite ◽  
...  
Keyword(s):  
Strength Training ◽  
Training Program ◽  
Lower Limb ◽  
The Body ◽  
Control Group ◽  
Maximal Velocity ◽  
Relative Power ◽  
Ballet Dancers ◽  
Jumping Performance ◽  
Lower Limb Strength

Jumping ability is considered a determinant of performance success. It is identified as one of the predictors and talent identification in many sports and dance. This study aimed to investigate the effect of 16 weeks of lower-limb strength training on the jumping performance of ballet dancers. A total of 24 participants from the same dance school were randomly selected in the control group [CG; n = 10; aged 13.00 (1.49) years; 43.09 (9.48) kg and 1.53 (0.11) m] and the intervention group [IG; n = 14; aged 12.43 (1.45) years; 38.21 (4.38) kg and 1.51 (0.07) m], evaluated before and after the applied strength training program mainly using the body weight of each participant. Jump performance was assessed using MyJump2, a scientifically validated mobile phone app. Intergroup and intragroup comparisons were assessed, and the magnitude of change was calculated using the effect size (ES). While CG significantly decreased the relative power over time (p < 0.001, ES = −0.29: small), results from the intragroup comparisons suggest that IG significantly increased the countermovement jump (CMJ) height (p < 0.001, ES = 1.21: large), the relative force (p < 0.001, ES = 0.86: moderate), maximal velocity (p < 0.001, ES = 1.15: moderate), and relative power (p < 0.001, ES = 1.37: large). We concluded that a 16-week strength training program of lower limbs is an effective way to improve CMJ height in young dancers. Supplementary strength training appears to be the determinant for the improvement of the jumping performance of ballet dancers.

Concurrent strength and sprint training increases resting metabolic rate in masters road cyclists

2020 ◽  
pp. 39-50
Author(s):  
Luke Delvecchio ◽  
Peter Reaburn ◽  
Jarrod Meerkin ◽  
Marko T. Korhonen ◽  
Nattai Borges ◽  
...  
Keyword(s):  
Metabolic Rate ◽  
Strength Training ◽  
Endurance Training ◽  
Training Stimulus ◽  
Resting Metabolic Rate ◽  
Endurance Athletes ◽  
Control Group ◽  
Sprint Training ◽  
Post Intervention ◽  
Road Cyclists

High-intensity concurrent sprint and strength training has been shown to provide a strong physiological training stimulus in young adult endurance athletes. However, the effect in veteran endurance athletes remains unknown. This study examined if replacing a portion of endurance training with concurrent sprint and strength training influenced resting metabolic rate (RMR) and lean mass (LM) in veteran endurance cyclists. Eighteen well-trained male veteran road cyclists (55.2 ± 8.4 years; 7.9 ± 1.1 training hrs/wk; 323 ± 53 Wpeak) were allocated to a concurrent strength and sprint training group (CT, n = 9) or control group (CON, n = 9). The CT group completed a 12-weeks of sprint and strength training while the CON group maintained their normal endurance training. RMR and LM were measured before and after the 12-week training intervention. CT training significantly (p < 0.05) increased both RMR (+14.2%, 1600 ± 244 to 1828 ± 207 kcal/day) and LM (+2.0%, 61.8 ± 5.5 to 63.1 ± 5.4 kg) pre to post-intervention. No significant changes from pre- to post-training were observed in the CON group. These findings suggest replacing a portion of endurance training with sprint and strength training may preserve, and even increase, LM and RMR in veteran road cyclists.

scholarly journals Three-week effect of stretching training on lower limb torque and muscle power

1989 ◽  
Author(s):  
Helton Magalhães Dias ◽  
◽  
Marcelo Zanetti ◽  
Tiago de Santos ◽  
Carlos Alexandre Falconi ◽  
...  
Keyword(s):  
Lower Limb ◽  
Muscle Power ◽  
Knee Extension ◽  
Left Knee ◽  
Control Group ◽  
Static Stretching ◽  
Isokinetic Dynamometer ◽  
Post Intervention ◽  
Strength Performance ◽  
And Control

Investigation about influences between stretching training and muscle strength performance can contribute to the understanding of training. The aim of the present study was to verify the effect of three weeks of stretching training on muscle torque and power. Ten adults, divided into Stretching Group (GA, N = 5) and Control Group (CG, N = 5) were evaluated pre and post intervention. The intervention was performed by GA and consisted of a passive static stretching protocol for the posterior thigh muscles, performed three times a week and during three weeks. The torque and power of the knee extension and flexion were evaluated using an isokinetic dynamometer at three speeds (60, 180 and 360º/s). Range of motion (ROM) was assessed using the sit and reach test. There was an increase in ROM (pre: 23.0 ± 5.6 cm; post: 30.1 ± 6.58 cm; p = 0.033) of GA, but there were no differences between and within groups for the other variables (p> 0.05). There were correlations of the ROM only for the flexion torque (r = 0.664; p = 0.036) and power of the extension (r = 0.638; p = 0.047) of the left knee at 60º/s. It was concluded that three weeks of static stretching training promoted significant gains in ROM, but did not allow increases in torque and power.

scholarly journals A low-cost easily implementable physiotherapy intervention clinically improves gait implying better adaptation to lower limb prosthesis: a randomized clinical trial

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Leticia Vargas Almeida ◽  
Claudiane Arakaki Fukuchi ◽  
Tania Emi Sakanaka ◽  
Alberto Cliquet
Keyword(s):  
Lower Limb ◽  
Low Cost ◽  
Intervention Group ◽  
Lower Limb Amputation ◽  
Limb Amputation ◽  
Control Group ◽  
Post Intervention ◽  
Physiotherapy Intervention ◽  
Lower Limb Prosthesis ◽  
Limb Prosthesis

AbstractLower limb amputation highly impacts the lives of individuals. The inability to walk due to difficulties in adapting to wearing prosthesis can potentially result in physical degeneration and comorbidity in this population. In this randomized clinical trial study, we investigated if a low-cost and easily implementable physiotherapy intervention was effective in improving gait performance and adaptation to lower limb prosthesis in individuals with an amputation. A total of 26 individuals participated in the study, 16 with lower limb amputation and 10 without amputation. Participants with amputation were further divided in intervention and control groups. The intervention group underwent a rehabilitation protocol aimed at strengthening muscles and improving prosthesis adaptation. Muscle strengthening targeted the hip segment, prioritizing the abdominal muscles, hip flexors, extensors, adductors and abductors, followed by cicatricial mobilization and weight-bearing on the stump for desensitization. Assessment and measures were performed across the kinetic and kinematic parameters of gait. In the comparison between pre-and post-intervention, a significant increase in gait speed (0.68—2.98, 95% CI, 1.83, effect size ES) and cadence (0.56—2.69, 95% CI, 1.63, ES) was found between groups and time points. Step (0.73—3.11, 95% CI, 1.92, ES) and stride length (0.62—2.84, 95% CI, 1.73) increased between pre- and post-intervention, while in the control group both variables remained smaller. The intervention group decreased stance phase as a percentage of gait cycle between pre- and post-intervention (− 1.33—0.62, 95% CI, − 36, ES), while it increased in the control group. Improvement in a combination of important gait parameters indicates that the intervention protocol promoted the adaptation to prosthesis and the functional independence of individuals with lower limb amputation. It is recommended that the participants continue receiving follow-up assessments and rehabilitation interventions.

scholarly journals Changes in sprint performance and sagittal plane kinematics after heavy resisted sprint training in professional soccer players

PeerJ ◽  
2020 ◽  
Vol 8 ◽  
pp. e10507
Author(s):  
Johan Lahti ◽  
Toni Huuhka ◽  
Valentin Romero ◽  
Ian Bezodis ◽  
Jean-Benoit Morin ◽  
...  
Keyword(s):  
Sagittal Plane ◽  
Sprint Performance ◽  
Soccer Players ◽  
Control Group ◽  
Minimal Detectable Change ◽  
Maximal Velocity ◽  
Sprint Training ◽  
Adaptation Potential ◽  
Professional Soccer ◽  
Split Time

Background Sprint performance is an essential skill to target within soccer, which can be likely achieved with a variety of methods, including different on-field training options. One such method could be heavy resisted sprint training. However, the effects of such overload on sprint performance and the related kinetic changes are unknown in a professional setting. Another unknown factor is whether violating kinematic specificity via heavy resistance will lead to changes in unloaded sprinting kinematics. We investigated whether heavy resisted sled training (HS) affects sprint performance, kinetics, sagittal plane kinematics, and spatiotemporal parameters in professional male soccer players. Methods After familiarization, a nine-week training protocol and a two-week taper was completed with sprint performance and force-velocity (FV) profiles compared before and after. Out of the two recruited homogenous soccer teams (N = 32, age: 24.1 ± 5.1 years: height: 180 ± 10 cm; body-mass: 76.7 ± 7.7 kg, 30-m split-time: 4.63 ± 0.13 s), one was used as a control group continuing training as normal with no systematic acceleration training (CON, N = 13), while the intervention team was matched into two HS subgroups based on their sprint performance. Subgroup one trained with a resistance that induced a 60% velocity decrement from maximal velocity (N = 10, HS60%) and subgroup two used a 50% velocity decrement resistance (N = 9, HS50%) based on individual load-velocity profiles. Results Both heavy resistance subgroups improved significantly all 10–30-m split times (p < 0.05, d =  − 1.25; −0.62). Post-hoc analysis showed that HS50% improved significantly more compared to CON in 0–10-m split-time (d = 1.03) and peak power (d = 1.16). Initial maximal theoretical horizontal force capacity (F0) and sprint FV-sprint profile properties showed a significant moderate relationship with F0 adaptation potential (p < 0.05). No significant differences in sprinting kinematics or spatiotemporal variables were observed that remained under the between-session minimal detectable change. Conclusion With appropriate coaching, heavy resisted sprint training could be one pragmatic option to assist improvements in sprint performance without adverse changes in sprinting kinematics in professional soccer players. Assessing each player’s initial individual sprint FV-profile may assist in predicting adaptation potential. More studies are needed that compare heavy resisted sprinting in randomized conditions.

Controlled Trial of the Sequential Use of Streptokinase and Ancrod in the Treatment of Deep Vein Thrombosis of Lower Limb

1977 ◽  
Vol 37 (02) ◽  
pp. 222-232 ◽  
Author(s):  
D. A Tibbutt ◽  
C. N Chesterman ◽  
E. W Williams ◽  
T Faulkner ◽  
A. A Sharp
Keyword(s):  
Deep Vein Thrombosis ◽  
Clinical Improvement ◽  
Anticoagulant Therapy ◽  
Lower Limb ◽  
Oral Anticoagulant ◽  
Controlled Trial ◽  
Oral Anticoagulant Therapy ◽  
Control Group ◽  
Vein Thrombosis ◽  
Deep Vein

SummaryTreatment with streptokinase (‘Kabikinase’) was given to 26 patients with venographically confirmed deep vein thrombosis extending into the popliteal vein or above. Treatment was continued for 4 days and the patients were allocated randomly to oral anticoagulant therapy or a course of treatment with ancrod (‘Arvin’) for 6 days followed by oral anticoagulant therapy. The degree of thrombolysis as judged by further venographic examination at 10 days was not significantly different between the 2 groups. The majority of patients showed clinical improvement but there was no appreciable difference between the groups at 3 and 6 months. Haemorrhagic complications were a more serious problem during the period of treatment with ancrod than during the equivalent period in the control group.

Promoting Key Family Practices of Common Childhood Illnesses among Mothers with Under-Five Children in Selected Military Communities

2019 ◽  
Vol 31 (2) ◽  
pp. 153-158
Keyword(s):  
Health Promotion ◽  
Health Promotion Program ◽  
Control Group ◽  
Study Group ◽  
Post Intervention ◽  
Under Five ◽  
Under Five Children ◽  
Eta Squared ◽  
Family Practices ◽  
Knowledge And Practice

Mothers are fundamental caregivers for under-five children and thus, family participation in child health services is very important. Therefore, a quasi-experimental study for promoting key family practices of mothers with under-five children was conducted among 278 respondents from Oaktwin Cantonment and Inndaing Cantonment in 2014. Data were collected by face-to-face interview with pretested structured questionnaire. Health promotion program including health education and advocacy for unit supports was implemented in study group. Before intervention, baseline data of respondents and pre-intervention knowledge and practices levels were identified. In the three-month and six-month after interventions, post-intervention data collection was done in both groups and data were analyzed. Findings show that there was a statistically significant difference of knowledge and practice scores between study group and control group after three-month interventions (t=10.827, p<0.0001, eta squared=0.297 and t=8.2, p<0.0001, eta squared=0.195, respectively), and six-month post-intervention (t=10.035, p<0.0001, eta squared=0.267 and t=8.773, p<0.0001, eta squared=0.304, respectively). Moreover, knowledge and practice level within study groups have a significant effect for time (F=160.45, p<0.0001 and F=113.06, p<0.0001, respectively) and the magnitude of this effect was also large (eta squared=0.699 for knowledge and 0.621 for practice). At the same time, knowledge and practice of control group have a significant effect for time (F=3.648, p=0.029 and F=19.564, p<0.0001, respectively) but this effect was very small. It can be asserted that health promotion program can improve the knowledge and practice of mothers regarding key family practices. The findings of current study might be a cornerstone for improvement of maternal knowledge and practice on caring for children in the military community.

Feedback based on health advice via tracing bracelet and smartphone in the management of Blood Pressure among hypertensive patients: A Community-based RCT Trial in Chongqing, China (Preprint)

2020 ◽  
Author(s):  
Yong Zhang ◽  
Yang Tao ◽  
Yun Zhong ◽  
Jacqueline Thompson ◽  
Jamal Rahmani ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Control Group ◽  
Community Settings ◽  
Post Intervention ◽  
Attrition Rates ◽  
Hypertensive Patients ◽  
Professional Health ◽  
Group A ◽  
And Control ◽  
Study Intervention

UNSTRUCTURED Lifestyle interventions have been recognised as a line treatment of non-communicable diseases. The aimed of this study was to evaluate a bespoke mHealth approach to delivers personalised feedback to improve blood pressure and weight for hypertensive patients in community settings. A total of 307 participants, 50 from each community, were expected to be in the intervention or control group. A professional health facilitator was assigned for each of the 6 communities. The primary outcomes of the study are the reduction in blood pressure and weight at baseline and post-intervention. Of 307 recruited,192 (62.5%) participants completed the study (intervention: 104 and control: 88). There was no difference in attrition rates between the two groups (33.5%vs41.9%, p=0.291). After 6-months of intensive feedback intervention through mHealth approach, patients had better blood pressure, weight, and BMI compared with control. People who were adherent to the intervention demonstrated a clinical benefit with regards to weight and blood pressure.

scholarly journals Reducing Aggression by Developing Emotional and Inhibitory Control

2021 ◽  
Vol 18 (10) ◽  
pp. 5263
Author(s):  
Miriam Romero-López ◽  
María Carmen Pichardo ◽  
Ana Justicia-Arráez ◽  
Judit Bembibre-Serrano
Keyword(s):  
Psychosocial Development ◽  
Mixed Model ◽  
Linear Mixed Model ◽  
Generalized Linear Mixed Model ◽  
Emotional Control ◽  
Control Group ◽  
Post Intervention ◽  
Mixed Model Analysis ◽  
Intervention Measures ◽  
Experimental Group

The objective of this study is to measure the effectiveness of a program on improving inhibitory and emotional control among children. In addition, it is assessed whether the improvement of these skills has an effect on the reduction of aggressive behavior in pre-school children. The participants were 100 children, 50 belonging to the control group and 50 to the experimental group, aged between 5 and 6 years. Pre-intervention and post-intervention measures of inhibitory and emotional control (BRIEF-P) and aggression (BASC) were taken. A Generalized Linear Mixed Model analysis (GLMM) was performed and found that children in the experimental group scored higher on inhibitory and emotional control compared to their peers in the control group. In addition, these improvements have an effect on the decrease in aggressiveness. In conclusion, preventive research should have among its priorities the design of such program given their implications for psychosocial development.

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