Percentage Increase In Performance Research Articles

Acute Effect of Countermovement Jumping on Throwing Performance in Track and Field Athletes During Competition.

Karampatsos, GP, Korfiatis, PG, Zaras, ND, Georgiadis, GV, and Terzis, GD. Acute effect of countermovement jumping on throwing performance in track and field athletes during competition. J Strength Cond Res 32(1): 359-364, 2017-The purpose of the study was to investigate whether performing 3 consecutive countermovement jumps (CMJs) just before an attempt enhances performance in track and field throwers during competition. Twelve shot putters, 8 hammer throwers, 9 discus throwers, and 3 javelin throwers of both sexes participated in the study. They performed 3 maximal CMJs 85 ± 12 seconds before the second, fourth, and sixth attempt during 3 different official competitions of national level. Maximal strength (1 repetition maximum [1RM]) in squat and bench press was measured 1 week after the competition. Mean throwing performance was significantly higher after the CMJs intervention (2.66 ± 4.3%, range of increase 0.02-18.98%, p = 0.0001). Similarly, maximum throwing performance was significantly higher after the CMJs (2.76 ± 3.29%, range of increase 0.09-13.93%, p = 0.0009). All but 2 athletes increased their best performance after the CMJs. The percentage increase in performance was similar between sexes (male athletes 2.56 ± 3.01%; female athletes 3.06 ± 3.76%, p = 0.677), but it was higher for the "lighter throws" (discus and javelin throw: 4.66 ± 4.11%) compared with the "heavier throws" (shot and hammer throw: 1.62 ± 2.04%, p = 0.008). The percentage increase in performance was not significantly correlated with 1RM squat or bench press, anthropometric characteristics, and personal best performance. These results suggest that performing 3 CMJs approximately 1 minute before an attempt may increase track and field throwing performance during competition.

Anodal transcranial direct current stimulation enhances the effects of motor imagery training in a finger tapping task.

Motor imagery (MI) training and anodal transcranial direct current stimulation (tDCS) applied over the primary motor cortex can independently improve hand motor function. The main objective of this double-blind, sham-controlled study was to examine whether anodal tDCS over the primary motor cortex could enhance the effects of MI training on the learning of a finger tapping sequence. Thirty-six right-handed young human adults were assigned to one of three groups: (i) who performed MI training combined with anodal tDCS applied over the primary motor cortex; (ii) who performed MI training combined with sham tDCS; and (iii) who received tDCS while reading a book. The MI training consisted of mentally rehearsing an eight-item complex finger sequence for 13min. Before (Pre-test), immediately after (Post-test 1), and at 90min after (Post-test 2) MI training, the participants physically repeated the sequence as fast and as accurately as possible. An anova showed that the number of sequences correctly performed significantly increased between Pre-test and Post-test 1 and remained stable at Post-test 2 in the three groups (P<0.001). Furthermore, the percentage increase in performance between Pre-test and Post-test 1 and Post-test 2 was significantly greater in the group that performed MI training combined with anodal tDCS compared with the other two groups (P<0.05). As a potential physiological explanation, the synaptic strength within the primary motor cortex could have been reinforced by the association of MI training and tDCS compared with MI training alone and tDCS alone.

ANALISIS PENGARUH OVERCLOCKING PADA PROCESSOR TERHADAP KINERJA SISTEM

This research aims to gain a significant performance speed processor after the processor clockspeed increase in learning the principles of good processor clockspeed increase , as well as the stable and see the effect caused by overclocking the computer system performance when used daily . This research is an experiment that is true experiment , data collection technique is to conduct experiments and take measurements on the processor . Data analysis technique used is to look at the percentage increase in performance by comparing the measurement results with the end of the initial measurement . The measurement results showed that successful overclock to 17 % with the processor fan is still the standard and performance of the system is still stable , which is indicated by the results of measurements of OCCT . The results of measurements of sintetic test shows that the system performance is also increasing the speed increases . So also with the results of measurements and timing test rendering test . Real - life test also showed when the game GTA IV and the blender running, not the case of failure , such as crashes and down .

Performance and Benefits of Michigan Department of Transportation's Capital Preventive Maintenance Program

The Michigan Department of Transportation's (DOT) pavement preservation program dates back to 1992. In Michigan, pavement preservation is implemented primarily through the Michigan DOT's capital preventive maintenance (CPM) program, in which preventive maintenance treatments are used to protect existing pavement surfaces, to slow deterioration, and to correct surface deficiencies. An overall objective of the CPM program is to postpone major rehabilitation and reconstruction activities by extending the service life of pavements. Results of a study performed to calculate the benefits and costs of various preventive maintenance treatments used in the Michigan DOT's CPM program are presented. With benefit defined as the percentage increase in performance over a do-nothing or untreated pavement performance curve where data were available, benefits were calculated for preventive maintenance treatments. Benefit–cost ratios were calculated by unit cost, and permitted the comparison of the cost-effectiveness of similar treatments. The overall performance of the Michigan DOT's CPM program was also examined by comparing the life-cycle costs of a rehabilitation strategy to a preservation strategy with the use of a simplified approach. The outcome showed that the preservation strategy resulted in agency cost savings of approximately 25% per lane mile over a rehabilitation-only strategy. Findings from this study can be used to help the Michigan DOT improve its CPM project selection, treatment selection, and performance monitoring and modeling practices.

Enterprise Computing: Economies and Diseconomies of Scale in Server Price/Performance Relationships

It has been long held that computer systems exhibit economies of scale (Grosch's law) and that their price increases with performance, but at a decreasing rate. The empirical support for this proposition has largely been based on benchmark tests of complex processor performance engaged in a sequence of mathematical computations. This paper estimates price/performance elasticities using performance data derived from benchmark testing that simulates on-line transaction processing of the type found in business environments and analyzes the data by series, rather than by arbitrary hardware classes. We find that the systems of at least two series have price/performance relationships characterized by economies of scale, constant returns to scale, and diseconomies of scale, respectively. That is, Grosch's law holds for some series and not for others. Second, there is a direct relationship between performance and the magnitude of elasticities, with high-end servers exhibiting the largest percentage increases in price for a given percentage increase in performance. A discussion of other life cycle cost and performance issues is provided to give explanation and insight into the market place presence and investment in systems that possess diseconomies of scale based on price (initial cost).