Chavarren Javier

University of Las Palmas de Gran Canaria | ULPGC · Department of Physical Education

This study aimed to analyze the agreement between five bar velocity monitoring devices, currently used in resistance training, to determine the most reliable device based on reproducibility (between-device agreement for a given trial) and repeatability (between-trial variation for each device). Seventeen resistance-trained men performed duplicate t...

Osteocalcin is a hormone produced by osteoblasts which acts as a negative regulator of fat mass, protecting against diet induced obesity and insulin resistance in rodents. To determine if an acute increase in osteocalcin concentration is associated with opposed changes in circulating leptin levels and insulin resistance we studied 15 middle and lon...

br /> RESUMEN Para determinar la influencia que tienen en los valores de DMO, el número, intensidad y duración de las cargas submáximas utilizadas para calcular la recta de economía, 6 varones acudieron al laboratorio en 8 ocasiones. Tras la familiarización, se determinó el VO₂ pico, y el el VO₂ a 80, 100, 110, 120, 130, 140...

To assess the effect on the maximal oxygen deficit (MOD) of the intensity, the duration and the number of bouts utilized to calculate the submaximal VO2/intensity relationship, six males were tested on eight separate days. After familiarization, an incremental exercise test was used to assess the VO2peak an another three tests were performed to obt...

to the editor: Martyn-St. James and Carroll ([5][1]) manifest that they are surprised because they say “we emphasize bone mineral outcomes after only a 9-wk intervention.” They think that we should have mentioned the “bone remodeling transient.” The remodeling transient describes a change in

Leptin and osteocalcin play a role in the regulation of the fat-bone axis and may be altered by exercise. To determine whether osteocalcin reduces fat mass in humans fed ad libitum and if there is a sex dimorphism in the serum osteocalcin and leptin responses to strength training, we studied 43 male (age 23.9 2.4 yr, mean +/- SD) and 23 female phys...

The effects of a training program consisting of weight lifting combined with plyometric exercises on kicking performance, myosin heavy-chain composition (vastus lateralis), physical fitness, and body composition (using dual-energy X-ray absorptiometry (DXA)) was examined in 37 male physical education students divided randomly into a training group...

The aim of this study was to determine if gender differences in muscle mass explain the gender differences in running and cycling sprint performance. Body composition (dual-energy X-ray absorptiometry), and running (30 and 300 m test) and cycling (Wingate test) sprint performance were assessed in 123 men and 32 women. Peak power (PP) output in the...

Strength training is usually associated with a reduction in fat mass and with muscle hypertrophy. The aim of the present study was to examine whether the serum free leptin index (FLI), measured by the molar excess of soluble leptin receptor (sOB-R) over leptin, is increased by 6 weeks of strength training. Eighteen male, physical education students...

The aim of this study was to evaluate the effects of severe acute hypoxia on exercise performance and metabolism during 30-s Wingate tests. Five endurance- (E) and five sprint- (S) trained track cyclists from the Spanish National Team performed 30-s Wingate tests in normoxia and hypoxia (inspired O(2) fraction = 0.10). Oxygen deficit was estimated...

The main purpose of this study was to test the effects of a duathlon competition on running economy. METHODS. A prospective study. University. Participants: nine male and six female physical education students, which mean (SEM) age was 24.0 (1.3) years. Subjects participated in two competitive duathlons: D1 and D2 (5 km running + 16 km cycling + 2...

To determine the reliability of squatting jumps (SJ), counter-movement jumps (CMJ) and drop jumps (DJ) tests, as well as the reliability of the optimal dropping height during drop jumping. Jumping performance was assessed in 8 male and 9 female physical education students. Their age, weight and height (mean +/- SD) were 23.9 +/- 2.1 years, 72.0 +/-...

The purpose of this study was to determine the influence of pedalling rate on cycling efficiency in road cyclists. Seven competitive road cyclists participated in the study. Four separate experimental sessions were used to determine oxygen uptake (VO2) and carbon dioxide output (VCO2) at six exercise intensities that elicited a VO2 equivalent to 54...

The main aim of this study was to determine whether active recovery is more efficient than either passive recovery or recovery by performing stretching exercises, during high intensity intermittent exercise (HI). Another aim was to describe the effects of active recovery on the aerobic and anaerobic energy yield during HI. Ten physical education st...

The maximal accumulated oxygen deficit (MAOD) and VO2/cycling intensity relationship was assessed in twenty nine male Physical Education students. First, VO2max was measured using an incremental exercise test (20/W min). Subsequently, the VO2/cycling intensity relationship was determined at 6-7 submaximal intensities eliciting an VO2 between 60 and...

This study examined the suitability of the Wingate test as a means of assessing the maximal oxygen deficit (MOD), and the influence of the anaerobic capacity on the fraction of the MOD used during a 30- and a 45-s Wingate test in 19 male subjects. The MOD incurred in constant-intensity supramaximal exercise was higher (P < 0.01) than that for the 4...

Yet there are no anthropometric equations specific for the Canary Islands adult population. The purpose of this study was to develop an anthropometric equation specific for the Canary Islands adult male population, using dual-energy X-ray absorptiometry (DEXA) as the reference method. One hundred and sixty-nine males, twenty-two with a sedentary li...

BACKGROUND: Yet there are no anthropometric equations specific for the Cannary Islands adult population. The purpose of this study was to develop an anthropometric equation specific for the Canary Islands adult male population, using dual-energy X-ray absorptiometry (DEXA) as the reference method. SUBJECTS AND METHODS: One hundred and sixty-nine ma...

The aim of this study was to assess the effects of intensity on the reliability of VO2, VCO2, RER, VE, tidal volume (V(T)) respiratory rate (RR), heart rate (HR) and cycling efficiency (CE), during submaximal constant intensity exercise. Therefore, six healthy men which mean (±SD) ages, heights, weights and percent body fat were: 22.3 ± 0.8 years,...