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Hormonal responses to a single session of whole body vibration exercise in elderly individuals.
  1. Marco Cardinale (marco.cardinale{at}boa.org.uk)
  1. Olympic Medical Institute, United Kingdom
    1. Roy L Soiza (roy.soiza{at}nhs.net)
    1. Dept. of Medicine for the Elderly Woodend Hospital, United Kingdom
      1. John B Leiper (j.b.leiper{at}lboro.ac.uk)
      1. Loughborough University, United Kingdom
        1. Angela Gibson (angelagibson{at}onetel.com)
        1. Dept. of Medicine for the Elderly Woodend Hospital, United Kingdom
          1. William R Primrose (willie.primrose{at}arh.grampian.scot.nhs.uk)
          1. Dept. of Medicine for the Elderly Woodend Hospital, United Kingdom

            Abstract

            OBJECTIVE: Whole body vibration has been recently suggested as an alternative form of exercise. The aim of the study was to analyse the acute effects of a single session of whole body vibration exercise on anabolic hormones in aged individuals.

            DESIGN: A Randomised cross-over trial design was used.

            SETTINGS: Geriatrics department, Hospital.

            PARTICIPANTS: Twenty subjects (9 males and 11 females; median age 70 years (range 66 to 85 years) volunteered in the experiment.

            INTERVENTIONS: isometric squat on a platform with vibration (V) or no vibration (C) conditions.

            MAIN OUTCOME MEASUREMENTS: Plasma Cortisol, Testosterone, Growth Hormone, and IGF-1 were measured before, after, 1h and 2h after the interventions.

            REPORTS: A significant difference between treatments (P<.001) and a time by treatment interaction (P<.05) was found in IGF-1 levels. Cortisol levels were shown not to be significantly different between treatments (P=0.43) but a difference over time (P<.001) and a time x treatment interaction (P<.05) were identified. No significant differences were identified in GH and Testosterone levels.

            CONCLUSIONS: the results of our study suggest that 5 minutes of WBV exercise characterised by static squat with a frequency of 30Hz can be performed by elderly individuals without apparent signs of stress and/or fatigue. Furthermore, the results of the study showed that WBV produced an acute increase in the circulating levels IGF-1 and cortisol greater than that observed following the same exercise protocol conducted without vibration.

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