SCIENTIFIC TRAINING OF SPORTS MEDICINE FOR BALANCE OF KNEE JOINT MUSCLE STRENGTH OF ATHLETES

Men, Yanhua

doi:10.1590/1517-8692202127042021_0086

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Revista Brasileira de Medicina do Esporte

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Original Article • Rev Bras Med Esporte 27 (5) • 2021 • https://doi.org/10.1590/1517-8692202127042021_0086 copy

SCIENTIFIC TRAINING OF SPORTS MEDICINE FOR BALANCE OF KNEE JOINT MUSCLE STRENGTH OF ATHLETES

TREINAMENTO CIENTÍFICO DE MEDICINA ESPORTIVA PARA EQUILÍBRIO DA FORÇA MUSCULAR DA ARTICULAÇÃO DO JOELHO DE ATLETAS

ENTRENAMIENTO CIENTÍFICO DE LA MEDICINA DEPORTIVA PARA EL EQUILIBRIO DE LA FUERZA MUSCULAR DE LA ARTICULACIÓN DE LA RODILLA DE LOS ATLETAS

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Introduction:

As skiers need to complete their movements in high mountains and snow, the athlete's landing's stability is directly related to the movement's success. The stable landing action wins high scores for the athletes’ participating actions and protects their safety.

Objective:

This article analyzes the characteristics of lower limb muscle strength and static balance ability of female freestyle skiing aerials athletes to provide athletes with targeted strength training, evaluation of muscle effects after training, and athlete selection to provide a scientific basis valuable Theoretical reference.

Methods:

The paper uses isokinetic testing and balance testing methods to study the characteristics of the hip and knee flexor and extensor strengths of the Chinese great female freestyle skiing aerials athletes and the static balance characteristics in four standing positions.

Results:

The right flexor-extensor force, flexor-extensor force ratio, and average power value of the right hip joint were slightly greater than the left flexor power. The left and right knee joint extensor unit peak weight moments and the left and right average power values were all four indicators. Greater than the flexor, at different test speeds of 60°/s (slow speed) and 240°/s (fast), the peak flexion and extension torque per unit weight, the average power of flexion and extension, the force of flexion and extension, and the average power appear with the increase of the test speed as a significant difference.

Conclusions:

The research in the thesis recommends reasonable weight control and balanced training of muscle strength, using the condition of moderately increasing exercise speed, to strengthen the training of lower limb extensor strength, provide targeted strength training for athletes, evaluate the muscle effect after training and providing the scientific basis and valuable theoretical reference. Level of evidence II; Therapeutic studies - investigation of treatment results.

Keywords:
Skiing; Athletes; Static balance ability; Water sports; Muscle development

Object	Height/cm	Weight/kg	Age /year old	Training years/year
A	160.2	51.7	25	13
B	155.1	61.7	26	13
C	163.6	62.6	19	7
D	160.7	160.7	24	12
E	160.4	51.8	22	11
F	163.3	54.5	24	10

Test index	Flexor		Extensor
Test index	60°/s	240°/s	60°/s	240°/s
Peak torque per unit weight (left side) %	1.8±0.21^Δ Δ means 60°/s and 240°/s the same index comparison P <0. 05, the largest value marked in the two;	1.26±0.37	4.24±0.78^☆ ☆ means the comparison of flexion and extension indexes at 60°/s and 240°/s P <0. 05, marked with the largest value among the two.	3.28±0.43^☆ ☆ means the comparison of flexion and extension indexes at 60°/s and 240°/s P <0. 05, marked with the largest value among the two.
Peak torque per unit weight (right side) %	1.9±0.16^Δ Δ means 60°/s and 240°/s the same index comparison P <0. 05, the largest value marked in the two;	1.44±0.27	4.33±0.79^☆ ☆ means the comparison of flexion and extension indexes at 60°/s and 240°/s P <0. 05, marked with the largest value among the two.	3.26±0.39^☆ ☆ means the comparison of flexion and extension indexes at 60°/s and 240°/s P <0. 05, marked with the largest value among the two.
Average power (left side)/W	60.5±8.97	93.00±9.01^Δ Δ means 60°/s and 240°/s the same index comparison P <0. 05, the largest value marked in the two;	135.6±14.16^☆ ☆ means the comparison of flexion and extension indexes at 60°/s and 240°/s P <0. 05, marked with the largest value among the two.	273.16±18.34^☆ ☆ means the comparison of flexion and extension indexes at 60°/s and 240°/s P <0. 05, marked with the largest value among the two.
Average power (right side)/W	61.0±7.16	97.00±9.83^Δ Δ means 60°/s and 240°/s the same index comparison P <0. 05, the largest value marked in the two;	143.8±16.25^☆ ☆ means the comparison of flexion and extension indexes at 60°/s and 240°/s P <0. 05, marked with the largest value among the two.	283.33±19.02^☆ ☆ means the comparison of flexion and extension indexes at 60°/s and 240°/s P <0. 05, marked with the largest value among the two.
Maximum flexion-extension ratio (left side) %	43.2±4.96^Δ Δ means 60°/s and 240°/s the same index comparison P <0. 05, the largest value marked in the two;	38.48±6.05	43.2±4.96^Δ Δ means 60°/s and 240°/s the same index comparison P <0. 05, the largest value marked in the two;	38.48±6.05
Maximum flexion-extension ratio (right side) %	44.9±5.08^Δ Δ means 60°/s and 240°/s the same index comparison P <0. 05, the largest value marked in the two; ^☆ ☆ means the comparison of flexion and extension indexes at 60°/s and 240°/s P <0. 05, marked with the largest value among the two.	45.18±7.29^☆ ☆ means the comparison of flexion and extension indexes at 60°/s and 240°/s P <0. 05, marked with the largest value among the two.	44.9±5.08^Δ Δ means 60°/s and 240°/s the same index comparison P <0. 05, the largest value marked in the two; ^☆ ☆ means the comparison of flexion and extension indexes at 60°/s and 240°/s P <0. 05, marked with the largest value among the two.	45.18±7.29^☆ ☆ means the comparison of flexion and extension indexes at 60°/s and 240°/s P <0. 05, marked with the largest value among the two.
Motion range (left side)/°	78.8±5.32^Δ Δ means 60°/s and 240°/s the same index comparison P <0. 05, the largest value marked in the two;	84.17±0.75	78.8±5.32^Δ Δ means 60°/s and 240°/s the same index comparison P <0. 05, the largest value marked in the two;	84.17±0.75
Range of motion (right side)/°	85.0±0.63^☆ ☆ means the comparison of flexion and extension indexes at 60°/s and 240°/s P <0. 05, marked with the largest value among the two.	85.84±0.76^☆ ☆ means the comparison of flexion and extension indexes at 60°/s and 240°/s P <0. 05, marked with the largest value among the two.	85.0±0.63^☆ ☆ means the comparison of flexion and extension indexes at 60°/s and 240°/s P <0. 05, marked with the largest value among the two.	85.84±0.76

Test index	Flexor		Extensor
Test index	60°/s	240°/s	60°/s	240°/s
Peak torque per unit weight (left side) %	1.58±0.26^Δ Δ means 60°/s and 240°/s the same index comparison P <0. 05, the largest value marked in the two;	1.23±0.34	2.43±0.29^Δ Δ means 60°/s and 240°/s the same index comparison P <0. 05, the largest value marked in the two; ^☆ ☆ means the comparison of flexion and extension indexes at 60°/s and 240°/s P <0. 05, marked with the largest value among the two.	1.85±0.20^☆ ☆ means the comparison of flexion and extension indexes at 60°/s and 240°/s P <0. 05, marked with the largest value among the two.
Peak torque per unit weight (right side) %	1.59±0.22	1.97±0.26^Δ Δ means 60°/s and 240°/s the same index comparison P <0. 05, the largest value marked in the two;	2.84±0.52^Δ Δ means 60°/s and 240°/s the same index comparison P <0. 05, the largest value marked in the two; ^☆ ☆ means the comparison of flexion and extension indexes at 60°/s and 240°/s P <0. 05, marked with the largest value among the two.	1.98±0.27
Average power (left side) /W	58.83±14.00	119.67±45.45^Δ Δ means 60°/s and 240°/s the same index comparison P <0. 05, the largest value marked in the two;	82.83±28.1^☆ ☆ means the comparison of flexion and extension indexes at 60°/s and 240°/s P <0. 05, marked with the largest value among the two.	204.17±44.1^Δ Δ means 60°/s and 240°/s the same index comparison P <0. 05, the largest value marked in the two;
Average power (right side)/W	53.33±11.60	112.00±27.17^Δ Δ means 60°/s and 240°/s the same index comparison P <0. 05, the largest value marked in the two;	96.34±28.4^☆ ☆ means the comparison of flexion and extension indexes at 60°/s and 240°/s P <0. 05, marked with the largest value among the two.	209.67±46.21^Δ Δ means 60°/s and 240°/s the same index comparison P <0. 05, the largest value marked in the two; ^☆ ☆ means the comparison of flexion and extension indexes at 60°/s and 240°/s P <0. 05, marked with the largest value among the two.
Maximum flexion-extension ratio (left side) %	59.63±11.53	67.69±17.97	59.63±11.53	67.69±17.97
Maximum flexion-extension ratio (right side) %	56.41±9.42	62.05±8.52	56.41±9.42	62.05±8.52
Motion range (left side)/°	84.30±1.75	85.83±1.47	84.30±1.75	85.83±1.47
Range of motion (right side)/°	82.50±4.03	85.84±1.48	82.50±4.03	85.84±1.48

Test items	X-axis moving distance/mm	Y-axis moving distance/mm	Speed moment/mm2·s-1
Open eyes normally	110.53±8.05	112.53±9.63	6.10±3.05
Normal linear eye-opening	191.91±9.82	183.32±13.8	30.21±10.94
Eyes open with left leg	201.4±21.14	196.6±16.89	74.06±4.34
Left leg closed eyes	335.69±26.57	315.34±19.56	101.4±15.78
Right leg open eyes	214.4±21.03	207.4±16.3	70.21±6.95
Right leg closed eyes	328.03±25.31	307.82±15.70	95.95±8.32

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[1] Correspondence: ilin Sport University, Changchun, 130000, China. 465984959@qq.com