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Kinesiological Analysis of Stationary Running Performed in Aquatic and Dry Land Environments

100%

Lima Alberton C., Santana Pinto S., Silva Azenha N. A. d., Cadore E. L., Peikriszwili Tartaruga M., Brasil B., Martins Kruel L. F.

Journal of Human Kinetics

2015

vol. 49

issue 1

5-14

The purpose of the present study was to analyze the electromyographic (EMG) signals of the rectus femoris (RF), vastus lateralis (VL), semitendinosus (ST) and short head of the biceps femoris (BF) during the performance of stationary running at different intensities in aquatic and dry land environments. The sample consisted of 12 female volunteers who performed the stationary running exercise in aquatic and dry land environments at a submaximal cadence (80 beats·min-1 controlled by a metronome) and at maximal velocity, with EMG signal measurements from the RF, VL, ST and BF muscles. The results showed a distinct pattern between environments for each muscle examined. For the submaximal cadence of 80 beats·min-1, there was a reduced magnitude of the EMG signal in the aquatic environment, except for the ST muscle, the pattern of which was similar in both environments. In contrast to the submaximal cadence, the pattern of the EMG signal from all of the muscles showed similar magnitudes for both environments and phases of movement at maximal velocity, except for the VL muscle. Therefore, the EMG signals from the RF, VL, ST and BF muscles of women during stationary running had different patterns of activation over the range of motion between aquatic and dry land environments for different intensities. Moreover, the neuromuscular responses of the lower limbs were optimized by an increase in intensity from submaximal cadence to maximal velocity.

Neuromuscular Responses of Elite Skaters During Different Roller Figure Skating Jumps

84%

Pantoja P. D., Mello A., Liedtke G. V., Kanitz A. C., Cadore E. L., Pinto S. S., Alberton C. L., Kruel L. F. M.

Journal of Human Kinetics

2014

vol. 41

issue 1

23-32

This study aimed to describe the neuromuscular activity of elite athletes who performed various roller figure skating jumps, to determine whether the muscle activation is greater during jumps with more rotations and in which phase the muscles are more active. This study also aimed to analyze if there is any difference in the muscle activity pattern between female and male skaters. Four elite skaters were evaluated, and each participated in two experimental sessions. During the first session, anthropometric data were collected, and the consent forms were signed. For the second session, neuromuscular data were collected during jumps, which were performed with skates at a rink. The following four roller figure skating jumps were evaluated: single Axel, double Axel, double Mapes and triple Mapes. The neuromuscular activity of the following seven muscles was obtained with an electromyograph which was fixed to the waist of each skater with a strap: biceps femoris, lateral gastrocnemius, tibialis anterior, rectus femoris, vastus lateralis, vastus medialis and gluteus maximus. The signal was transmitted wirelessly to a laptop. During the roller figure skating jumps, the lateral gastrocnemius, rectus femoris, vastus lateralis, biceps femoris and gluteus maximus, showed more activation during the jumps with more rotations, and the activation mainly occurred during the propulsion and flight phases. Female skaters demonstrated higher muscle activities in tibialis anterior, vastus lateralis, vastus medialis and gluteus maximus during the landing phase of the triple Mapes, when compared to their male counterparts. The results obtained in this study should be considered when planning training programs with specific exercises that closely resemble the roller figure skating jumps. This may be important for the success of elite skaters in competitions.

Strength Training Prior to Endurance Exercise: Impact on the Neuromuscular System, Endurance Performance and Cardiorespiratory Responses

68%

Conceição M., Cadore E. L., González-Izal M., Izquierdo M., Liedtke G. V., Wilhelm E. N., Pinto R. S., Reistenbach Goltz F., Dornelles Schneider C., Ferrari R., Bottaro M., Kruel L. F. M.

Journal of Human Kinetics

2014

vol. 44

issue 1

171-181

This study aimed to investigate the acute effects of two strength-training protocols on the neuromuscular and cardiorespiratory responses during endurance exercise. Thirteen young males (23.2 ± 1.6 years old) participated in this study. The hypertrophic strength-training protocol was composed of 6 sets of 8 squats at 75% of maximal dynamic strength. The plyometric strength-training protocol was composed of 6 sets of 8 jumps performed with the body weight as the workload. Endurance exercise was performed on a cycle ergometer at a power corresponding to the second ventilatory threshold until exhaustion. Before and after each protocol, a maximal voluntary contraction was performed, and the rate of force development and electromyographic parameters were assessed. After the hypertrophic strengthtraining and plyometric strength-training protocol, significant decreases were observed in the maximal voluntary contraction and rate of force development, whereas no changes were observed in the electromyographic parameters. Oxygen uptake and a heart rate during endurance exercise were not significantly different among the protocols. However, the time-to-exhaustion was significantly higher during endurance exercise alone than when performed after hypertrophic strength-training or plyometric strength-training (p <0.05). These results suggest that endurance performance may be impaired when preceded by strength-training, with no oxygen uptake or heart rate changes during the exercise.

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3 Journal of Human Kinetics

1 2015

2 2014

3 Cadore E. L.

2 Kruel L. F. M.

2 Liedtke G. V.

1 Alberton C. L.

1 Bottaro M.

1 Brasil B.

1 Conceição M.

1 Dornelles Schneider C.

1 Ferrari R.

1 González-Izal M.

1 Izquierdo M.

1 Kanitz A. C.

1 Lima Alberton C.

1 Martins Kruel L. F.

1 Mello A.

1 Pantoja P. D.

1 Peikriszwili Tartaruga M.

1 Pinto R. S.

1 Pinto S. S.

1 Reistenbach Goltz F.

1 Santana Pinto S.

1 Silva Azenha N. A. d.

1 Wilhelm E. N.

Search results

Kinesiological Analysis of Stationary Running Performed in Aquatic and Dry Land Environments

Neuromuscular Responses of Elite Skaters During Different Roller Figure Skating Jumps

Strength Training Prior to Endurance Exercise: Impact on the Neuromuscular System, Endurance Performance and Cardiorespiratory Responses