ABSTRACT
To create a safe and effective aerobic dance exercise (ADE) program, the intensity, and difficulty level of each step, and muscle activation during the program must be considered. This study evaluated the muscle activity levels of the lower extremities when major ADE movements were repeated at a fixed speed. The subjects were seven females 21-22 years old who were familiar with the ADE movements. Eleven low impact steps and nine high impact steps representative of the ADE movements were selected, and while the movements were performed, the surface electromyograms (EMG) of six muscles in the lower extremities were measured using a telemeter electromyograph. The EMG data for 10 cycles of each step were full wave rectified and integrated. Then, the average value per unit time was calculated, and normalized (%EMGmax) by the EMG integral value during isometric maximum voluntary contraction (EMGmax). The EMGmax was measured for each of the six muscles to evaluate the muscle activity level, and determine which muscles were activated at higher or lower levels in response to the specific steps. The highest levels of total muscle activity detected in the six muscles were for: double hop, jumping jack, and pendulum. The results of this study may help create ADE programs that consider the differences in muscle activation in the lower extremities.
ABSTRACT
@#The purpose of this study was to examine the effect of low-impact aerobic dance and zumba exercises in reducing the percentage of body fat in obese women in terms of the Body Mass Index (BMI). Forty obese women (mean age 33.9±7.1 years) were selected and divided into two experimental groups, namely: low-impact aerobic dance (n=20) and zumba (n=20). The participants were also divided based on the BMI which gave the mild and severe obesity groups. The research instrument was a skinfold caliper which was used to measure the thickness of the body fat. The experiment was carried out 3 times a week for 8 weeks and the participants from both groups performed exercises for a duration of 60 minutes. The analysis of data between the experimental groups showed that there were significant differences between these exercises (r=0.005; p<0.05), the levels of obesity (r=0,000; p<0.05), and there were interactions between the exercises and the levels of obesity (r=0,000; p<0,05), from the pre-test to the post-test. The results showed that low-impact aerobic dance was more effectively used in reducing the percentage of body fat in obese women at the severe levels while zumba was effectively used in reducing the percentage of body fat in obese women with mild obesity, therefore the two exercises had an influence in reducing the percentage of body fat.
ABSTRACT
Objective To investigate the effects of 8-week Grade 2 and 5 Aerobic Dances on physical fitness and visual evoked potentials(VEPs)of female students.Methods ① Forty five female student volunteers were randomly divided into three groups:control group(C).Grade 2(G2)and 5(G5)Aerobic Dances groups.The aerobic dances groups took part in Chinese National Aerobic Dance Grade 2(135 tempo/min)and 5(148 tempo/min)separately,lh/day,3 days/week,for 8 weeks.②Physical fitness in three groups was compared before and after 8 weeks.③The NDI-200 neural electricity tester(Haishen)was applied to measure the PR-VEPs in all subjects before and after the experiment,and the changes in VEPs latencies,inter-peak latencies and peak to peak amplitudes were compared.ResuIts①The number of sit-ups with 90°knees flexion and sit-and reach,and maximuin oxygen uptake of both groups G2 and G5 increased significantly(P0.05).Conclusion Both Grade 2 and 5 Aerobic Dances could improve the physical fitness and shorten the VEP P_(100) latency,especially the Grade 5 Aerobic Dance.
ABSTRACT
El propósito del presente artículo es describir los niveles de ruido generados en una competencia de resistencia aeróbica y se analizan las posibles implicaciones para la salud de la contaminación por ruido. La danza aeróbica es un modo de ejercicio que se ha extendido por todo el mundo, con el fin de posibilitar la práctica de una actividad física que combina música y movimiento. Al incluir el elemento musical en las clases de danza aeróbica, se expone a las personas que practican esta modalidad, al ruido que provoca un alto volumen. Hay investigadores que se han dedicado a estudiar la incidencia del ruido, a indicar los rangos permitidos en lugares de entretenimiento y los gimnasios e informar sobre el peligro de perder momentánea o permanentemente el sentido auditivo al exponerse continuamente a ambientes ruidosos. La presente investigación se realizó en las instalaciones deportivas de la Universidad de Costa Rica, durante un torneo de resistencia aeróbica. Se utilizó un medidor del nivel de sonido marca RadioShack, cat. No. 33-2055. Se encontró que los niveles de sonido utilizados para esta competencia excedieron los 90dB permitidos, ya que oscilaron entre 101 y 119 dB, durante los 120 minutos de duración de la actividad. Se requiere de mayor investigación en esta área en Costa Rica y ejercer un sistema de vigilancia para la contaminación sónica en los gimnasios.
The purpose of the study was to describe noise levels during an aerobics tournament and the potential health implications of noise contamination. Aerobic dance is a worldwide known exercise mode that allows people to practice a physical activity that combines both, music and movement. When music is used in aerobic dance classes people are constantly exposed to the noise produced by high volume of the music. Researchers have studied the incidence of noise to indicate the range of noise permitted in entertainment facilities and fitness centers, and to inform to the population about the hazards of short- and long-term noise exposure on hearing loss. This study took place at the sport facilities of the University of Costa Rica during an aerobics endurance tournament. A RadioShack® (cat. N° 33-2055) noise meter was used to measure noise levels. We found that sound levels for this competition exceeded the permitted 90dB, since these values ranged from 101 to 119 dB during the 120 min duration of the activity. More research in this area is necessary as well as a surveillance system for noise contamination in fitness facilities.
Subject(s)
Exercise , Hearing Disorders , Music , Noise , Noise Effects , Noise Measurement , Costa RicaABSTRACT
The purpose of this study was to investigate the injurious influence of aerobic dancing on the lower limbs injuries. Subjects were personally interviewed about exercise hours and the intensity of their classes, together with experience of injury, and their body configurations, alignments, ranges of motion, and muscular strengths were measured. EMG during aerobic dance exercise was measured in subjects with knee Q angles over and under 20 degrees.<BR>The incidence of lower limb injury was 64.3%, and the most frequent injury was shin splint. The injured individuals had significantly more high-intensity classes than normal. As to body configuration, the width in patella per femur was significantly lower and the value of patellar ligament per height was significantly higher in the injured than in the normal subjects. The range of motion of hip external rotation in the injured was significantly smaller than that in the normal subjects. EMG discharge of the vastus medialis in the injured with a knee Q angle of over 20 degrees was markedly greater than that in normal subjects with an angle of less than 20 degrees.
ABSTRACT
Aerobic dance (AD) is a form of fitness exercise whose program is constructed by a combination of various joint movements. Therefore the exercise is expected to give enough stimulus to not only the cardiorespiratory but also the musculoskeletal system. The purpose of this study was to evaluate the activity level of the leg muscles among the major 22 AD leg movements, or steps (13 low-impact steps and high-impact steps), by electromyography (EMG) analysis. The subjects were two trained AD instructors, who were asked to perform individual steps at a pitch of 144 bpm. EMG data were recorded from the iliopsoas, gluteus maximus, vastus lateralis, biceps femoris, tibialis anterior, and gastrocnemius muscles on the right side by means of surface electrodes. The half-wave of the raw EMG was rectified and integrated over periods of 20 s during the exercise. From the raw EMG data it was observed that the pattern and amplitude of the electrical discharge of each muscle varied in response to the difference in step motion. The integrated EMGs of the iliopsoas, biceps femoris, and gastrocnemius tented to show higher values for high-impact steps in comparison with low-impact steps, but that of the tibialis anterior showed a contrary trend. The mean value and stan-dard deviation of iEMG of each muscle for the 22 steps was calculated for the same subjects, and the muscle activity level was classified into 5 degrees. Making use of this evaluation table, it may be possible to construct an AD program that can activate the leg muscles impartially.