The objective of this study was to analyze the relationship between isometric force produced in different joints and its effects on the power kick serve speed in beach volleyball as a predictive aspect to improve sports performance. Seven athletes competing at national and international levels (mean ± standard deviation; age: 21.6 ± 3.20 years; body height: 1.87 ± 0.08 cm; body mass 80.18 ± 7.11 kg) were evaluated using maximum isometric force contractions (i.e., spinal and knee extension, grip by a hand dynamometer (handgrip), internal shoulder rotation, shoulder flexion, elbow flexion and extension, and wrist flexion). Speed of the ball was recorded with a pistol radar and force was measured with a strain gauge. Results showed a relationship between isometric force developed in the internal rotation of the shoulder and speed of the ball (r = 0.76*; p < 0.05). In the remaining isometric exercises, positive low to moderate correlations were found in the spine and knee extension (r = 0.56; p = 0.200) and elbow flexion (r = 0.41; p = 0.375). On the other hand, the remaining isometric exercises obtained weak or non-significant correlations. Force developed in the internal rotation of the shoulder highly correlated with the speed of the power kick, explaining, together with the elbow flexion and the extension of the knee and back, much of the variability of the power kick of beach volleyball athletes.
The objective of the present study is to determine the reliability of the measurements in the parameters of body composition of the Smart Performance measurement device and to compare the results with those produced by the InBody 270 device. Ten professional-level male athletes (mean weight = 58.4 kg ; height = 165.4 cm; BMI = 26.9 kg/m2) were analysed. An experimental design of a single cohort was carried out. Participants were tested on two 5-point bioimpedance devices: In-Body 270 (Biospace, Seoul, Korea) and Smart Performance. Measurements were made in the after-noon (6:30 p.m. - 7:30 p.m.). The variables used were weight (kg), fat mass (kg), muscle mass (kg), body water (L), BMI (kg/m2), protein and minerals. the Smart Performance Composition device presents a high degree of reliability for the analysis of body composition and its use at a recreation-al, sports and scientific level.
Sports commitment is a psychological construct that has been studied since the 1990s and that has been used in the educational field. The main objective of this study is to analyze the suitability of AirBadminton to acquired sports commitment and the classroom climate generated through the practice of AirBadminton. It was also proposed to analyze the physical, technical and temporal characteristics of AirBadminton. The research was developed with 1298 students between 13 and 15 years of age (mean ± standard deviation; body height: 1.61 ± 7.08 m; body mass 59.68 ± 7.11 kg); one group developed an AirBadminton didactic unit forming the experimental group, and a second group carried out other net games, being the control group. The following instruments were used: the Sports Commitment Questionnaire-2 CCD-2, the Brief Class Climate Scale EBCC, the analysis software LongoMatch version 1.10.1, the heart rate (HR) and the distance traveled of some participants were monitored with different Polar brand sensors (Polar H10 and Verity Sense) and two SPI-Elite GPS devices from the GPSports brand. Results show that sports commitment was increased in the experimental group. AirBadminton shows aspects that are directly and positively related to intrinsic motivation and adherence to sports practice; it improves the classroom climate and increases the desire to excel of the participants.
The objective of this article was to compare different cardiovascular training machines and their effects on the body, as well as to determine their suitability for people with low intensity or high intensity training needs. A total of 8 physically active and healthy male subjects (mean ± standard deviation; age: 28.45 ± 1.75 years; height: 1.84 ± 0.07 m; body weight 76.42 ± 8.62 kg; body mass index: 25.5 ± 2.6) were evaluated through of an incremental exercise test at different intensities on two different machines: Elliptical Domyos 680 (BED) and Deconstruct Elliptical 331-EF (DEC). To compare both machines against the two mentioned training needs, two different protocols were carried out: Low Intensity Protocol (LIP) and High Intensity Protocol (HIP). In addition, a thermographic analysis was carried out in order to determine the temperature differences reached in the musculature. No significant differences were found in HR and EE (p < .05) between the two machines. However, a greater and more progressive activation of the muscles of the upper extremities was observed in the DEC machine. In the HIP, HR and EE were measured, obtaining significant differences (p < .05) higher in the DEC machine. Therefore, in our comparison, the Deconstruct Elliptical machine produced more appropriate results for both low and high intensity training compared to the Elliptical machine. These results and the novel nature of the Deconstruct Elliptical raise the need for further studies to better understand this machine.
The objective of this article was to establish comparisons between different special operations units of the army. 91 male subjects (mean ± Standard deviation; age: 33.05 ± 3.28 years; height: 1.77 ± 1.37 m; body weight 79.02 ± 1.59 kg), divided into 4 groups (mountain, diving, UEO and mobility), were evaluated through body composition and stress tests. A bioimpedance test was carried out to determine the different tissues and an incremental treadmill stress test with a gas analyser to establish the different physiological parameters. The results showed significant differences in terms of heart rate (HR) in the different thresholds (ventilatory threshold 1, ventilatory threshold 2 and maximum oxygen consumption) and in the speed reached in these (p < .05). On the other hand, with respect to body composition (muscle mass weight, % fat mass and fat weight), no significant differences were observed between the different groups analysed (p > .05).
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