Strength-training and biological rhythm of male sex hormone among judoists

Abstract

Testosterone is a steroid hormone that is secreted by the testes with a diurnal rhythm and has a strong anti-catabolic (anabolic) effect on muscles. There is a strong relationship (r > 0.9) between concentrations of testosterone in the saliva and blood. The main purpose of the current study is to investigate the effect of strength-training on levels of salivary testosterone in male judoists. In a cross-sectional investigation, a population of 18 fit young male judoists (aged 17.0 ± 1.2 year, body mass 72 ± 3 kg, height 175 ± 3 cm, means ± SD), with at least 1.5 years of experience in judo classes was examined in Isfahan, Iran, in December, 2012. The period of testing consisted of two days of "rest" and two days of "exercise". Subjects were randomly divided into two conditions that performed either the "rest" or "exercise" days during the first week, with the opposite type of day in the second week. The training regimen consisted of three repetitions of nine tasks, with 1 min of rest between each of the three sets, performed on alternate days for 8 weeks. Unstimulated saliva was collected (1-2 ml) every 2 h from 06:00 till 22:00 h. ANOVA with repeated measures was used to assess differences between the rest and exercise days. Strength-training sessions caused a significant decrease in testosterone levels immediately after exercise (p < 0.001), but there was no significant difference between the daily profiles of testosterone during the rest or exercise days (p > 0.05). It is concluded that strength-training does not significantly affect the normal biological rhythm of salivary testosterone during the waking period in male judoists.

Analysis of the effects of resistance training on circadan rhythm of endocrine hormones

“…In an attempt to determine and compare the effects of different types of resistance training on the circadian rhythm of endocrine hormones, a cross-sectional study was employed on Judoists [6]. This study confirmed previous findings when it found that resistance training, irrespective of the type, failed to alter the circadian rhythm of hormone concentrations.…”

The Adverse Health Effects of Shift Work in Relation to Risk of Illness/Disease: A Review

“…A host of scientists have discovered that the beat domains of physically healthy or physically energetic persons are higher than those possessed by out-of-form or inactive subjects [4,44,45], However, these suggestive contacts are highly confounding and complex. The fact that a rhythm domain of this vast a magnitude could be infl uenced by the physiological version within a more superior context, or "synchronised" by a consistent physical activity and thus inciting a more pronounce experiential rhythm, remains uncertain [46]. Nevertheless, a silver lining exists; such a gap may provide a new research topic for future scholars.…”

Respuesta de cortisol salival y ansiedad precompetitiva en nadadores (Salivary cortisol response and precompetitive anxiety in swimmers)

“…Se eligió colectar muestras de saliva, por su naturaleza no invasiva, lo que no genera estrés en los niños, favoreciendo a la obtención de la autorización parental y cooperación del niño; además de ser fácil de obtener, y porque no necesita especial entrenamiento para el evaluador (Shariat, Kargarfard, Tamrin, Danaee & Karimi, 2014). Otra razón es la independencia de la tasa de flujo, ya que el cortisol salival representa la fracción biológicamente activa y libre de cortisol en sangre en respuesta al ejercicio (Gozansky, Lynn, Laudenslager & Kohrt, 2005;Papacosta & Nassis, 2011); y es una técnica de las más usadas actualmente (Silva, Mallozi & Ferrari, 2007).…”