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Neuromuscular and hormonal responses to a single session of whole body vibration exercise in healthy young men

Julie Erskine

College of Life Sciences and Medicine, University of Aberdeen, Aberdeen

Olympic Medical Institute, Northwick Park Hospital, Middlesex

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Ian Smillie

College of Life Sciences and Medicine, University of Aberdeen, Aberdeen

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John Leiper

College of Life Sciences and Medicine, University of Aberdeen, Aberdeen

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Derek Ball

College of Life Sciences and Medicine, University of Aberdeen, Aberdeen

School of Life Sciences, Heriot Watt University, Edinburgh, UK

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Marco Cardinale

College of Life Sciences and Medicine, University of Aberdeen, Aberdeen

Olympic Medical Institute, Northwick Park Hospital, Middlesex

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First published: 10 June 2007
Cited by: 38
Julie Erskine, Olympic Medical Institute, Northwick Park Hospital, Watford Road, Harrow, Middlesex, HA1 3UJ, UK
E‐mail: j.a.erskine@abdn.ac.uk

Summary

Whole body vibration (WBV) has been proposed as an alternative exercise stimulus to produce adaptive responses similar to resistance exercise. Few studies have analysed acute hormonal responses to WBV.

Purpose To evaluate neuromuscular and hormonal responses to an acute bout of isometric half‐squat exercise with and without superimposition of WBV.

Methods Seven healthy males (22·3 ± 2·7 years) performed 10 sets of half squat isometric exercise for 1 min with 1‐min rest between sets. Two separate trials were conducted either with WBV [30 Hz; 3·5 g (1 g = 9·81 m·s2)] or without vibration (Control). Salivary concentration of testosterone and cortisol was collected and maximal isometric unilateral knee extensions (MVC) were completed before, immediately after, 1, 2 and 24 h after treatment.

Results Significant decreases in MVC were observed immediately after (229·4 ± 53·2 Nm), 1 h (231·6 ± 59·9 Nm), and 2 h (233·0 ± 59·1 Nm) after WBV compared with baseline (252·7 ± 56·4 Nm; P<0·05). No significant change in MVC was recorded in Control. Rate of torque development in the first 200 ms (RTD200 ms), and salivary testosterone and cortisol concentrations were unaffected in both conditions. However, there was a trend for change over time in cortisol (P = 0·052), with an increase after WBV and decrease after Control.

Conclusion A 10 min session of intermittent WBV was shown to produce an acute reduction in MVC in healthy individuals, which recovered after 24 h. No significant changes were identified in salivary concentration of testosterone and cortisol suggesting that WBV with low acceleration does not represent a stressful stimulus for the neuroendocrine system.

Number of times cited: 38

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