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Effects of hyperbaric (6 ATA) pressure on voluntary and evoked skeletal muscle contractile properties

Behm, D., Power, K., White, M., LeDEZ, K., Decker, D. and Drinkwater, E. 2003, Effects of hyperbaric (6 ATA) pressure on voluntary and evoked skeletal muscle contractile properties, Undersea and hyperbaric medicine, vol. 30, no. 2, Summer, pp. 103-115.

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Title Effects of hyperbaric (6 ATA) pressure on voluntary and evoked skeletal muscle contractile properties
Author(s) Behm, D.
Power, K.
White, M.
LeDEZ, K.
Decker, D.
Drinkwater, E.ORCID iD for Drinkwater, E. orcid.org/0000-0002-9594-9360
Journal name Undersea and hyperbaric medicine
Volume number 30
Issue number 2
Season Summer
Start page 103
End page 115
Total pages 13
Publisher Undersea and Hyperbaric Medical Society
Place of publication North Palm Beach, Fla.
Publication date 2003
ISSN 1066-2936
Keyword(s) plantar flexors
interpolated twitch technique
EMG
force-frequency characteristics
rate of torque development
Summary The objective of this study was to investigate the effect of 6 atmospheres of pressure (ATA) on plantar flexors' (PF) voluntary force and activation, force-frequency characteristics, and rate of torque development (RTD). Eight subjects performed PF isometric contractions. Muscle activation was monitored by electromyographic (EMG) activity (PF and dorsiflexors) and the interpolated twitch technique (ITT). Maximal evoked contractions of the PF were elicited at 1, 2, 3, 5, 10, 20, and 40 Hz. PF RTD was calculated with maximal voluntary, 1 and 40 Hz contractions. Hyperbaric pressures significantly decreased PF voluntary torque; 6.2%, ITT activation; 2.8% with a trend for a 19.1% decrease in EMG (p = 0.1). There were no significant differences in the dorsiflexors/PF EMG ratio. One Hz torque was potentiated 15.7% with an increased absolute RTD of 12.8%, but no change in relative RTD. The results suggested hyperbaric-induced decreases in PF activation contributed to voluntary torque loss. A lack of torque reduction with higher frequency tetanic stimulation (2-40 Hz) suggested that 6 ATA does not impair myofilament kinetics, whereas twitch potentiation may include changes in excitation-contraction coupling.
Language eng
Field of Research 110699 Human Movement and Sports Science not elsewhere classified
1103 Clinical Sciences
Socio Economic Objective 929999 Health not elsewhere classified
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2003, Undersea and Hyperbaric Medical Society
Persistent URL http://hdl.handle.net/10536/DRO/DU:30083153

Document type: Journal Article
Collection: School of Exercise and Nutrition Sciences
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