scholarly journals The effects of different types of warm-up exercises on golf performance

2021 ◽  
Keyword(s):  
Optimal Strategy ◽  
Neuromuscular System ◽  
Ball Speed ◽  
Warm Up ◽  
Dynamic Stretching ◽  
Speed Increase ◽  
Total Distance ◽  
Different Types ◽  
Before And After ◽  
Club Head

Background and objective: Most studies of golf warm-up exercises have focused on the differences between static and dynamic stretching, while relatively few have compared them to post-activation potentiation (PAP) warm-up exercises. The current study aimed to verify the effects of different types of warm-up exercises on golf performance, with the goal of identifying an optimal strategy. Methods: A total of 30 elite golf players in their 20s and 30s were randomly assigned to three different groups of 10 participants each: the dynamic warm-up (DWU) group, the PAP group, and the swing warm-up (SWU) group. Driving distance, six-iron carry, club head speed, ball speed, smash factor, and accuracy were measured before and after each warm-up exercise. Results: Driving distance increased by 2.65% in the DWU group (P < 0.001) and 2.21% in the PAP group (P < 0.01). Carry also significantly increased by 2.30% in the DWU group (P < 0.01) and 2.10% in the PAP group (P < 0.01). The PAP group exhibited a six-iron carry increase of 3.35% (P < 0.001) and a ball speed increase of 1.86% (P < 0.05). In terms of accuracy, the rate of errors decreased by 47.49% in the DWU group (P < 0.01). Conclusion: Among the golf-specific warm-up exercises investigated, DWU was identified as the most efficient exercise for improving total distance and accuracy. Such improvements can be attributed to increased mobility, as well as enhancements in swing size and the efficiency of the neuromuscular system. Thus, our results suggest that golf players should perform DWU exercises to improve their golf performance.

scholarly journals Unilateral and Bilateral Post-Activation Performance Enhancement on Jump Performance and Agility

2021 ◽  
Vol 18 (19) ◽  
pp. 10154
Author(s):  
Alejandro Escobar Hincapié ◽  
Carlos Alberto Agudelo Velásquez ◽  
Mariluz Ortiz Uribe ◽  
Camilo Andrés García Torres ◽  
Andrés Rojas Jaramillo
Keyword(s):  
Effect Size ◽  
Performance Enhancement ◽  
Vertical Jump ◽  
Effect Sizes ◽  
Training Experience ◽  
Jump Performance ◽  
Warm Up ◽  
Vertical Jumping ◽  
Different Types ◽  
Before And After

This study aimed to compare the effects of the post-activation performance enhancement (PAPE) of two different types of warm-ups, unilateral and bilateral, on the performance in vertical jumping and agility of healthy subjects with strength training experience. In the study, 17 subjects (12 men and 5 women) performed two different PAPE protocols: unilateral squat (UT) and bilateral squat (BT). The height of the subjects’ countermovement jump (CMJ) and the subjects’ time to perform the T-agility test (TAT) were measured before and after executing the PAPE warm-up. The squats were performed at a velocity of 0.59 m·s−1 with three sets of three repetitions, with a 3-min rest between sets and a 5-min rest after both uni-and bilateral PAPE warm-ups before taking the tests again. For statistical analysis, we applied ANOVA and calculated the effect size. The results showed that the PAPE for each case decreased the CMJ height but generated significant improvements in the total time taken for the T-agility test (p < 0.01); however, in both cases, the effect sizes were trivial. In conclusion, it is possible to observe that the PAPE, performed both unilaterally and bilaterally, negatively affects the performance in the vertical jump, showing moderate effect sizes. However, both PAPE protocols show performance benefits in agility tests, with a large effect size for the unilateral protocol and moderate for the bilateral protocol.

Effects of Dynamic Stretching Combined With Static Stretching, Foam Rolling, or Vibration Rolling as a Warm-Up Exercise on Athletic Performance in Elite Table Tennis Players

2020 ◽  
pp. 1-8
Author(s):  
Fang-Yu Hsu ◽  
Kuei-Lan Tsai ◽  
Chia-Lun Lee ◽  
Wen-Dien Chang ◽  
Nai-Jen Chang
Keyword(s):  
Random Order ◽  
Step Test ◽  
Table Tennis ◽  
Static Stretching ◽  
Ball Speed ◽  
Warm Up ◽  
Tennis Players ◽  
Dynamic Stretching ◽  
Foam Rolling ◽  
Jump Test

Context: Warm-up exercise is an essential preexercise routine for athletes to optimize performance. However, the benefits of combined warm-up protocols remain unclear. Objective: This comparative study investigated the acute effects of dynamic stretching (DS) followed by static stretching (SS), self-myofascial release using a foam rolling (FR) device, or vibration foam rolling (VFR) as a warm-up exercise to improve flexibility, power, agility, and specific skills in elite table tennis players. Design: A crossover study. Setting: University. Participants: Twenty-three elite table tennis players. Interventions: Players completed 3 different interventions in a random order (DS + SS, DS + FR, and DS + VFR). The target muscle groups included the bilateral posterior calf, posterior thigh, anterior thigh, back, and shoulder. Main Outcome Measures: Sit-and-reach test for flexibility, board jump test for lower-extremity power, medicine ball throw test for upper-extremity power, Edgren Side Step Test for agility, and ball speed of table tennis was assessed before and after intervention. Results: After intervention, significant increases in flexibility (15.2%, 20.4%, and 23.8%); lower-limb power (4.5%, 6.6%, and 6.3%); upper-limb power (9.6%, 8.5%, and 9.1%); and ball speed (7.4%, 7.6%, and 7.7%) were observed for DS + SS, DS + FR, and DS + VFR, respectively (all P < .001). In addition, only DS coupled with FR (5.1%) and DS in conjunction with VFR (2.7%) significantly improved agility (P < .001). However, no significant improvements in agility were observed after DS + SS. In addition, no one protocol was superior to the other in all outcomes. Conclusion: The authors suggest that a combination of DS with FR or VFR as warm-up exercises significantly improved flexibility, power, ball speed, in addition to agility in elite table tennis players. Coach and athletic professionals may take this information into account for choosing more effective warm-up protocols to enhance performance.

scholarly journals EFFECTS OF DIFFERENT HALF-TIME RE-WARM UP ON VERTICAL JUMP DURING SIMULATED BASKETBALL GAME

2018 ◽  
Vol 2 (109) ◽  
pp. 35-40
Author(s):  
Rėjus Pociūnas ◽  
Vytautas Pliauga ◽  
Inga Lukonaitienė ◽  
Dominykas Bartusevičius ◽  
Tomas Urbonavičius ◽  
...  
Keyword(s):  
Vertical Jump ◽  
Jump Height ◽  
College Level ◽  
Half Time ◽  
Warm Up ◽  
Vertical Jump Height ◽  
Basketball Game ◽  
Counter Movement Jump ◽  
Different Types ◽  
Before And After

Background. This study investigated the acute effects of different half–time re–warm ups on vertical jump height during simulated basketball games. Methods. Ten college level males (age (mean ± standard deviation (SD)), 22.0 ± 5.0 years; weight, 86.0 ± 5.5 kg; height, 193 ± 1 cm.) were divided into two teams, who played three simulated basketball games with three different type half-time re-warm ups: aerobic; aerobic + post-activation potentiation exercises and aerobic + post-activation potentiation + stabilization exercises. Counter-movement jump was measured before and during the simulated basketball game at seven time points: before and after warm up, after the 1 st, the 2 nd quarters, after re-warm up and after the 3 rd and the 4 th quarters. Simulated basketball games were separated at least by 72 hours. Results. The non-significant decrease in Counter-movement jump height during simulated basketball games was observed after executing all three different types of half-time re-warm ups. However, Counter-movement jump significantly (p < .05) decreased during simulated basketball game only in aerobic type half-time re-warm up game. Conclusion. During simulated basketball game, the least decrease in Counter-movement jump height was observed after aerobic type re-warm up with post-activation potentiation exercises performed at half-time.

IMPROVEMENT LAYOUT AND ELEMENTS WORK IN ERGONOMIC ASPECTS

2012 ◽  
Vol 2 (2) ◽  
pp. 84-99
Author(s):  
Beci Sariani ◽  
Meizul Zuki ◽  
Yusril Dany
Keyword(s):  
Working Conditions ◽  
Cycle Time ◽  
Completion Time ◽  
Content Creation ◽  
Left Hand ◽  
Total Distance ◽  
Standard Time ◽  
Before And After ◽  
Right And Left Hand

The purpose of this study is to describe layout and elements of the movement labor, determine cake making job completion time before and after repair, complaints of pain workers and recomendation improved layout and elements work in ergonomic aspects. Layout and elements of the cake making job is less visible than ergonomic working conditions with temperatures as high as 290C and 300C, total distance moving much material for the production namely 2407 cm, manufacture molen 180 cm, 2926 cm baking and packaging 626 cm. Percentage of use right and left hand at creation pia cake is 50.11% and 54.4%. Making molen is 100% and 76.69%. Pia cake making is 12.76% and 12.21%. Packaging is 100% and 84.8%. Cycle time, normal time and standard time of content creation, namely 17004.15, 18.534.52 and 25.577.64 seconds (2 basins). Making molen is 560.23, 616.25 and 751.82 seconds (1 basin). Pia cake making is 1.165,45, 1314.63 and 1.603,85 seconds (2 trays), and packaging is 15,40, 16,79 and 23.17 seconds (2 pack). The application of ergonomics : 8 types of grievances felt a bit sick and 1 type of grievances felt sick. Station molen manufacture, workers felt no pain. Baking station pia (sub-stations) only complaint molen rolling on his back felt a little sore. Sub-station charging only 3 workers who feel a little pain complaints and pain. In the sub-station : 6 types pengovenan grievances felt a little sick. The packing station after repairs only felt a little pain in the waist

scholarly journals Quality assessment of gas produced from different types of biomass pellets in gasification process

2019 ◽  
Vol 38 (2) ◽  
pp. 406-416 ◽  
Author(s):  
Marcel Mikeska ◽  
Jan Najser ◽  
Václav Peer ◽  
Jaroslav Frantík ◽  
Jan Kielar
Keyword(s):  
Gas Turbines ◽  
Combustion Engine ◽  
Calorific Value ◽  
Internal Combustion ◽  
Combustion Gas ◽  
Gas Cleaning ◽  
Gasification Process ◽  
Different Types ◽  
Before And After ◽  
Cleaning Technology

Gas from the gasification of pellets made from renewable sources of energy or from lower-quality fuels often contains a number of pollutants. This may cause technical difficulties during the gas use in internal combustion gas engines used for energy and heat cogeneration. Therefore, an adequate system of gas cleaning must be selected. In line with such requirements, this paper focuses on the characterization and comparison of gases produced from different types of biomass during gasification. The biomass tested was wood, straw, and hay pellets. The paper gives a detailed description and evaluation of the measurements from a fix-bed gasifier for the properties of the produced gases, raw fuels, tar composition, and its particle content before and after the cleaning process. The results of elemental composition, net calorific value, moisture, and ash content show that the cleaned gases are suitable for internal combustion engine-based cogeneration systems, but unsuitable for gas turbines, where a different cleaning technology would be needed.

scholarly journals Are the Acute Effects of THC Different in Aging Adults?

2021 ◽  
Vol 11 (5) ◽  
pp. 590
Author(s):  
Raeghan L. Mueller ◽  
Jarrod M. Ellingson ◽  
L. Cinnamon Bidwell ◽  
Angela D. Bryan ◽  
Kent E. Hutchison
Keyword(s):  
Older Adults ◽  
Young Adults ◽  
Age Groups ◽  
Young Group ◽  
Self Administration ◽  
Behavioral Measures ◽  
Younger Adults ◽  
Different Types ◽  
Before And After ◽  
Aging Adults

In recent years of expanding legalization, older adults have reported the largest increase in cannabis use of any age group. While its use has been studied extensively in young adults, little is known about the effects of THC in older adults and whether the risks of cannabis might be different, particularly concerning intoxication and cognition. The current study investigated whether age is associated with the deleterious effects of THC on cognitive performance and other behavioral measures before and after ad libitum self-administration of three different types of cannabis flower (THC dominant, THC + CBD, and CBD dominant). Age groups consisted of young adults (ages 21–25) and older adults (ages 55–70). Controlling for pre-use scores on all measures, the THC dominant chemovar produced a greater deleterious effect in younger adults compared with older adults in tests of learning and processing speed, whereas there were no differences between old and young in the effects of the other chemovars. In addition, the young group reported greater cannabis craving than the older group after using the THC chemovar. Consistent with some reports in the preclinical literature, the findings suggest that older adults may be less sensitive to the effects of THC on cognitive and affective measures.

Human mobility models reveal the underlying mechanism of seasonal movements across China

2021 ◽  
Author(s):  
Bing Song ◽  
Xiao-Yong Yan ◽  
Suoyi Tan ◽  
Bin Sai ◽  
Shengjie Lai ◽  
...  
Keyword(s):  
Traffic Engineering ◽  
Human Mobility ◽  
Underlying Mechanism ◽  
Gravity Models ◽  
Mobility Models ◽  
Temporal And Spatial Distribution ◽  
Population Movements ◽  
Different Types ◽  
Before And After ◽  
Time Periods

Understanding the spatial interactions of human mobility is crucial for urban planning, traffic engineering, as well as for the prevention and control of infectious diseases. Although many models have been developed to model human mobility, it is not clear whether such models could also capture the traveling mechanisms across different time periods (e.g. workdays, weekends or holidays). With one-year long nationwide location-based service (LBS) data in China, we investigate the spatiotemporal characteristics of population movements during different time periods, and make thorough comparisons for the applicability of five state-of-the-art human mobility models. We find that population flows show significant periodicity and strong inequality across temporal and spatial distribution. A strong “backflow” effect is found for cross-city movements before and after holidays. Parameter fitting of gravity models reveals that travels in different type of days consider the attractiveness of destinations and cost of distance differently. Surprisingly, the comparison indicates that the parameter-free opportunity priority selection (OPS) model outperforms other models and is the best to characterize human mobility in China across all six different types of days. However, there is still an urgent need for development of more dedicated models for human mobility on weekends and different types of holidays.

scholarly journals Comparative Analysis of Capabilities of Different Types of Cone-Beam Tomography in an Experimental Study of Root Canals of Teeth Filled with High-Density Materials (part 2)

2021 ◽  
pp. 51-61
Author(s):  
A. Yu. Vasil'ev ◽  
V. V. Petrovskaya ◽  
E. A. Nichipor ◽  
V. G. Alpatova ◽  
N. N. Potrakhov ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Experimental Study ◽  
Cone Beam Computed Tomography ◽  
Comparative Assessment ◽  
High Density ◽  
Cone Beam ◽  
Root Canals ◽  
Different Types ◽  
Before And After ◽  
Cone Beam Tomography

During the course of this experimental study tomograms of extracted teeth were analyzed before and after filling the root canals with an endodontic material and fragments of broken metal instruments for root canal treatment. During the first stage of the experiment, untreated extracted teeth were scanned using conebeam computed tomography and microfocus cone-beam computed tomography. A comparative assessment of capabilities of the two methods of cone-beam computed tomography based on examination of untreated root canals was carried out. The second part of the study is dedicated to visualization of root canals that contain foreign high-density materials.

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