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Acute physiological responses in healthy men during whole-body vibration

  • Rammohan V. MaikalaEmail author
  • Sharla King
  • Yagesh N. Bhambhani
Original Article

Abstract

Objective: The influence of backrest support and handgrip contractions on acute metabolic, respiratory, and cardiovascular responses were evaluated in 13 healthy men during exposure to whole-body vibration (WBV). Methods: Following assessment of aerobic fitness during arm cranking, subjects were exposed to frequencies 3, 4.5, and 6 Hz with 0.9 gr.m.s acceleration magnitude on a vibrating base in randomized order, on separate days. Each exposure included 6 min baseline without WBV, 8 min of WBV exposure either ‘with‘ or ‘without’ backrest, 4 min recovery, followed by 8 min of WBV with opposite backrest condition, and 4 min recovery. During the final minute of WBV, subjects performed right hand maximal rhythmic handgrip contractions for one minute. During baseline and before completion of WBV session ‘with’ and ‘without’ backrest, cardiac output was estimated indirectly by carbon dioxide rebreathing. Results: At 3 and 4.5, and 3 and 6 Hz, absolute and relative oxygen uptake demonstrated significantly greater responses during sitting ‘without’ backrest than ‘with’ backrest (P<0.01). At 3 and 4.5 Hz, heart rate and oxygen pulse responses were significantly greater during WBV combined with handgrip contractions than during WBV alone (P<0.01), demonstrating physical work during WBV will enhance greater metabolic responses. Stroke volume was the lowest at 4.5 Hz (P<0.01). Influence of aerobic fitness was evident only in absolute oxygen uptake, oxygen pulse, and ventilation volume (P<0.01). Conclusions: This study demonstrates that subjects exposed to physical work during WBV will experience greater metabolic responses compared to WBV alone, and the physiological responses during WBV resemble to that of a light physical work. Despite low metabolic rates during WBV, the effect of aerobic fitness suggests the importance of physical activity in occupations exposed to WBV.

Keywords

Cardiorespiratory responses Handgrip contractions Backrest support Spinal resonance frequency Aerobic fitness 

Notes

Acknowledgements

This study was part of the doctoral dissertation done by the first author at the University of Alberta, Edmonton, Canada. This project was partly supported by the Small Faculties Grant, University of Alberta, Edmonton, Canada. The authors sincerely thank Al Fleming and Brian Henderson for their technical assistance, and Martha Roxburgh and Sharon Brintell of the Occupational Analysis Performance Unit for loaning the Vibrating Simulator. We are also grateful to Gurpreet Sidhu, Winnie Ting, Geetanjali Kashyap, and Mamdouh Farag for their help in initial experimental setup and data collection. All of the experiments conducted complied with the current laws of Canada.

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • Rammohan V. Maikala
    • 1
    Email author
  • Sharla King
    • 2
  • Yagesh N. Bhambhani
    • 3
  1. 1.Liberty Mutual Research Institute for SafetyHopkintonUSA
  2. 2.InterProfessional Initiative, Health Sciences CouncilUniversity of AlbertaEdmontonCanada
  3. 3.Faculty of Rehabilitation MedicineUniversity of AlbertaEdmontonCanada

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