National Weightlifters Research Articles

수직점프와 악력이 국가대표 역도선수의 경기력 예측에 미치는 효과

The Purpose of this study was to investigate whether hand grip strength and vertical jump are critical indicators to predict performance of Korea national weightlifters. The Subjects for this study were 29 Korea national weightlifters. The Cajori 5-step method was applied and all participants were divided into 4 groups according to grip strength and vertical jump capacity: High grip strength and high vertical jump group (HGHV, n=10), High grip strength and low vertical jump group (HGLV, n=8), Low grip strength and high vertical jump group (LGHV, n=7), Low grip strength and low vertical jump group (LGLV, n=4). Significant differences between groups were determined with one-way repeated ANOVA. As the result of this study, general fitness such as agility, flexibility, and balance did not differ significantly between groups, but the maximum strength of squat and back strength was significantly higher in HGHV and LGHV than in other groups. Isokinetic knee extension and flexion strength was higher in HGHV compared to groups with low vertical jump record. But isokinetic trunk extension and flexion functions were not significantly different between groups. Our findings suggest new evidence that grip strength and vertical jump capability might be important factors in predicting the performance of weightlifters, and vertical jump is most closely related.

Resting Metabolic Rate of Junior National Weightlifters in India: Development and Validation of Prediction Models

Weightlifters involve in intense strength and resistance training, thus calorie adequacy is a nutritional concern for them. Determining Resting Metabolic rate (RMR) is important to assess energy needs and there is limited scientific evidence in this area. Thus, this study aims to document physical characteristics and RMR of Indian junior weightlifters. It also attempts to identify suitable RMR prediction equations by developing new equations and comparing measured with predicted RMR from seven equations already existing world-wide. In this cross-sectional observation study, twenty one Indian junior weightlifters (Boys = 9; Girls = 12) were assessed for body composition (skinfold technique) and RMR using indirect calorimetry. Regression models for RMR were developed and measured RMR was compared with predicted RMR using paired samples t-test. The 24-hour RMR showed significant (P<0.01) gender differences (Boys = 1675 ± 111.7; Girls = 1425 ± 93.4), whereas, RMR per unit fatfree mass and body mass were similar across gender. The simple equation developed using body mass (RMR = 1206 + 13 × Body Mass (Kg) – 227.7 × Gender; R2 = 0.872; SEE = 60.604) showed good agreement with measured RMR. Out of seven existing RMR models, the equation of ten Haaf and Weijs (2014) showed better predictability. In conclusion, fat-free mass caused a major variation in RMR. Considering the limited scientific evidence, prediction equations newly developed and RMR equation of ten Haaf and Weijs (2014) can be used for periodical monitoring of RMR.

Optimal load and power spectrum during snatch and clean: differences between international and national weightlifters

The aim of this study was to determine the optimal load (Pmax load) and optimal power spectrum (OPS) to achieve maximum power output (Pmax) during the snatch and clean with international weightlifters (IW) and national competitive weightlifters (NW). Twenty-two male weightlifters participated in two testing sessions. The first session involved performing one-repetition maximums (1RM) in the snatch and clean and second session assessed a power test across a spectrum of loads (30–90%) of each subject’s 1RM in the predetermined exercises tested. Relative load had a significant effect on peak power, with Pmax load being obtained with 90% of 1RM for snatch and clean in the IW and 70 and 90% of 1RM for snatch and clean, respectively, in the NW. OPS was located between 80 and 90% for snatch and no OPS was found for the clean exercise in IW. In the NW, OPS was located between 70% up to 90% and 50% up to 90% in the snatch and clean, respectively. It may be advantageous to know the Pmax load and OPS in the snatch and clean when training to maximise power of weightlifters of different sport performance.

A Study on ACE, ACTN3, and VDR Genes Polymorphism in Thai Weightlifters

In order to excel in sport, apart from the correct training, the genetic combination of an individual may also be a factor in making an elite athlete. Weightlifting, as a popular sport, has a unique bio-mechanism dealing with muscle performance. The current study investigated the polymorphisms of the angiotensin-converting enzyme (ACE), the a-actinin-3 (ACTN3), and the vitamin D receptor (VDR) genes (individually or in combination) in Thai weightlifters. A total of 117 male and female national and junior Thai weightlifters, and 99 healthy sedentary people were recruited for this study. Genotyping was analyzed by Polymerase Chain Reaction (PCR) and Polymerase Chain Reaction - Restriction Fragment Length Polymorphism (PCR-RFLP). When compared to the junior and non-athletes group, the genotype and allele frequencies of ACE (DD), ACTN3 (RR), and VDR (ff) were more frequent in both male and female national weightlifters. In addition, the genotype combinations between ACE (DD) + VDR (ff), ACE (DD) + ACTN3 RR, and ACTN3 RR + VDR ff presented highly in both genders of national weightlifters. Taken together, our results suggest that the ACTN3 and VDR genotype, individually or in combination, may influence muscle performance in weightlifters, appearing to significantly contribute to better weightlifting performance.

Comparison of lateral abdominal muscle thickness between weightlifters and matched controls

Objective To compare lateral abdominal muscle thickness between weightlifters and matched controls. Design A case control study design. Setting University laboratory. Subjects 16 female Thai national weightlifters and 16 matched controls participated in this study. Main outcome measures Ultrasound imaging with a 12-MHz linear array was used to measure the resting thickness of transversus abdominis (TrA), internal oblique (IO) and total thickness (Total) of lateral abdominal muscle (LAM) on the right side of abdominal wall. The absolute muscle thickness and the relative contribution of each muscle to the total thickness were determined. Results Weightlifters had significantly thicker absolute TrA and IO muscles than matched controls ( p < 0.01). Further, the relative thickness of the IO was significantly greater in weightlifters than matched controls ( p < 0.05). Conclusions The findings of this study suggest that routine Olympic style weight training among female weightlifters appears to result in preferential hypertrophy or adaptation of the IO muscle.

역도 인상동작 수행시 바벨 증가에 따른 EMG 경향성에 대한 연구

This research was to know EMG tendency on increasing record in snatch weightlifting. In order to perform this research, we choiced 3 man national weightlifters, EMG analysis were executed on 8 major muscle(Latissimus Dorsi, Trapezius, Anterior Deltoid, Posterior Deltoid, Gastrocenemius, Vastus Medialis, Erector spinae, Abdominal). First trial record of athletics is 80% of each maximal record and increase the gradually. In this study, EMG signal scale of all muscle except posterior Deltoid muscle don`t increased according to increasing the barbell weight, This showed a difference between general recognition and experiment result. In posterior Deltoid muscle, EMG signal scale increased according to increasing the barbell weight. It was assumed that EMG signal of protagonist shows possibility of linear increasing if motion have a consistency. It was assumed that In present, In order to increase one`s record to , Motion consistency training is more effective training method than increasing the muscle force.