Health & Environmental Research Online (HERO)


Print Feedback Export to File
5420634 
Journal Article 
The valsalva maneuver revisited: the influence of voluntary breathing on isometric muscle strength 
Ikeda, ER; Borg, A; Brown, D; Malouf, J; Showers, KM; Li, S 
2009 
Yes 
Journal of Strength and Conditioning Research
ISSN: 1064-8011
EISSN: 1533-4287 
23 
1 
127-132 
English 
19050647 
WOS:000271400500021 
We assessed the effects of 4 voluntary breathing conditions on maximal voluntary isometric force of large muscle groups. Ten subjects performed maximum voluntary isometric contractions (MVICs) of knee flexion and extension, shoulder abduction and adduction, and elbow flexion and extension under all breathing conditions: normal breathing, forced inhalation, forced exhalation, and the Valsalva maneuver (VM). Forced exhalation significantly increased peak force during shoulder adduction, elbow extension, and knee extension MVIC tasks (p = 0.001, 0.024, and 0.002, respectively); the peak force during the Valsalva maneuver was not different from forced exhalation for all tested muscle groups. No voluntary breathing condition seemed to influence the peak force during the knee flexion, elbow flexion, and shoulder abduction MVIC tasks. The results demonstrate that voluntary breathing imposes a significant impact on isometric muscle strength. Given the increased cardiovascular risks associated with the Valsalva maneuver, it is highly recommended that forced exhalation be used during exercise at maximal levels, especially in repetitive repetitions. 
human; maximal voluntary isometric contraction; muscle strength; respiration