Educación física y recreación

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https://hdl.handle.net/10669/291

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Mostrando 1 - 4 de 4

Can We Improve The Bosco Test? A Biomechanical Analysis
(2016-05) Acuña Espinoza, Alejandro; Aragón Vargas, Luis Fernando
PURPOSE: To compare average power output (APO) results as calculated directly fro m instantaneous vertical ground reaction forces (IVGRFs), with the Bosco Test APO. METHODS: 18 sedentary adult males (21.6±2.4 years, 67.2±11.3 kg, 1.77±0.05 m), 6 volleyball players (22.0±3.4 years, 72.3±12.5 kg, 1.8 4±0.10 m), 6 marathon runners (30.8±7.7 years, 73.2±11.0 kg, 1.75±0.05 m), and 6 swimmers (32.2±6.91 years, 78.8±4.6 kg, 1.77±0.06 m) performed a 60 - s Bosco Test on a Force Plate. Total time in the air, total number of jumps, and IVGRFs were recorded from the force plate signal. APO (Watts/kg) was calculated from ‘efficient’ IVGRF using both the conventional Bosco methodology and PotevAA, our proposed method, for the same trials. Two-way ANOVAs with repeated measures were used to compare APO for the different groups and between methods.
Hydration Status and Fluid Intake Habits of Fitness Enthusiasts
(2006-05) García, Pedro Reinaldo; Aragón Vargas, Luis Fernando; Javornik Krope, Ricardo Martín
PURPOSE: To determine the hydration status (HS) and its relation with fluid intake habits (FIH), and exercise variables of fitness enthusiasts before one exercise session on different times of the day, at three different gyms located in Caracas, Venezuela. METHODS: 295 subjects (148 male, 147 females; age: 37.7 ±10.1 years old) filled a questionnaire related with hydration and training habits. Thirst sensation was measured with a subjective scale ranging from 1 (not thirsty) to 5 (very thirsty). A urine sample was collected before the exercise session to determine the urine specific gravity (USG) trough a hand held refractometer. To the extent that USG is a valid indicator of hydration status the value of USG ≥1.020 was used as the cut-off point for dehydration. The urine samples were taken and questionnaire filled once per subject, at different times of the day (6:00–9:00 h or 17:00–20:00 h). Non parametric statistics and ANOVA were used. RESULTS: 122 subjects (41.4 %) appeared to be inadequately hydrated before exercise. Females were better hydrated compared with males (67.3 % vs. 50.0 %, p=.002), and these females used fluid bottles more frequently than do males (74.1 %vs. 44.6 %, p <.005). People who trained in the late afternoon were better hydrated that people who trained in the morning (69.4% vs. 30.6 %, p = .001). There was no relation between the HS, thirst sensation, age, occupation, years of training experience, days of training a week, kind of exercise practiced or duration of the training schedule, and the hydration state. CONCLUSIONS: A significant percentage of fitness enthusiasts are showing up to train already hypohydrated. Females were better hydrated than males, perhaps due to better FIH (fluid availability or “carrying their own fluids”). People who trained in the afternoon were better hydrated before exercise than people who trained in the morning.
Thirst Perception Tracks Progressive Dehydration During Exercise In The Heat
(2014-05) Capitán Jiménez, Catalina; Aragón Vargas, Luis Fernando
Thirst is claimed to be a perfect measure of fluid needs, but insufficient information is available on the association between thirst perception and actual dehydration. Purpose: to assess the strength of the actual association between net fluid balance (NFB) and thirst during exercise in the heat. Methods: Fourteen healthy participants (27.3 ± 2.3 years old, 72.55 ± 18.52 kg; mean ± standard deviation) reported to the laboratory after an overnight fast and completed two different sessions (dry heat and humid heat), equivalent in WBGT (27.7°C), one week apart. Participants exercised for 2 hours on a stationary bicycle in a climate-controlled chamber without any fluid intake. Nude and dry BM was measured every 30 minutes; dehydration was calculated from weight loss as %BM. At the same time points, thirst perception (TP) was evaluated with Engell’s 9-point scale. Means were compared via one- or two-way ANOVAs as pertinent. A multiple regression analysis was used to test the association between NFB and TP, with individuals included in the model. Results: initial values were consistent between sessions (BM: 72.5 ± 18.52 vs 72.26 ± 18.32 p = 0.185; USG: 1.017 ± 0.005 vs 1.017 ± 0.005, p = 0.77, and thirst: 2.6 ± 1.9 vs 2.4 ± 1.33, p = 0.39). Neither TP (p = 0.916) nor NFB (p = 0.140) were different between sessions, but both changed significantly over time (p < 0.001), see table. There was a clear association between thirst and net fluid balance during dehydration: R 2 = 0.74, R 2 a = 0.70; p < 0.001.
Voluntary Drinking Cessation is Associated with Recovery of Plasma Osmolality but not of Thirst Perception, Usg, Or Body Mass
(2017) Capitán Jiménez, Catalina; Aragón Vargas, Luis Fernando
Post-exercise rehydration has been widely studied, with special emphasis on retention of ingested fluid; little research has been done on why we drink more or less. Purpose: To identify if voluntary drinking cessation coincides with a return to pre-exercise physiological values. Methods:9 males consented to participate. They exercised intermittently (30 min bicycle-30 min treadmill , at 70-80% HRmax) in the heat (WBGT= 28.1±0.7°C), to a dehydration of 3.6±0.3% body mass (BM). Upon exercise termination, participants were instructed to drink as long and as much as they needed while monitoring water intake. When intake was less than 100mL in 15 min, that was considered the point of voluntary drinking cessation. Urine color (Ucolor), specific gravity (USG), and osmolality (Uosm), plasma osmolality (Posm), fullness, and thirst perception (TP) were measured pre- and post-exercise, and post-rehydration. Matched pairs analyses were performed to compare pre-exercise and post-rehydration. Results: At the point of drinking cessation, participants had recovered 58.7±12% (1445- 2427mL, min-max) of body mass loss. Variable Pre-exer (mean±SD) Post- rehy (mean±SD) t p Posm 289.5±2.3 287.3±5.4 -1.11 0.300 Uosm 870.7±2.3 763.7±193.9 -1.49 0.175 Thirst 36.2±19.1 25.0±18.2 -2.32 0.049 BM 83.0±12.6 81.8±12.0 -3.99 0.004 USG 1.022±0.004 1.029±0.004 5.82 0.0004 Ucolor 3.4±0.7 6.3±1.1 6.83 0.0001 Fullness 3.1±0.9 2.1±1.1 -1.80 0.1080 Conclusion: the results suggest that voluntary drinking cessation coincided with a return to pre-exercise values of Posm, Uosm , and fullness, even though rehydration was under 60%. Nevertheless, body weight, thirst perception, urine color and USG had not returned to pre-exercise values at the same point

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