Intra-Abdominal and Intra-Thoracic Pressures during Lifting and Jumping,
ARMY RESEARCH INST OF ENVIRONMENTAL MEDICINE NATICK MA
Pagination or Media Count:
To investigate intra-thoracic pressure ITP and intra-abdominal pressure IAP during lifting and jumping, 11 males were monitored as they performed the dead lift DL, slide row SR, leg press LP, bench press BP, and box lift BL, at 50, 75 and 100 of each subjects 4-repetition maximum, the vertical jump VJ, drop-jump DJ form 0.5 and 1.0 meter heights, and Valsalva maneuver VM. Measurements were made of peak pressure, time from pressure rise to switch-marked initiation of body movement TRISE, and time from the movement to peak pressure TPEAK. The highest ITP and IAP occurred during VM 22.2 or - 6.0 and 26.6 or - 6.7 kPa respectively with one individual reaching 36.9 kPa 227 mmHg IAP. In ascending order of peak ITP during the highest resistance sets, the activities were SR, BP, VJ, DJ, DL, LP AND VM, while the order for IAP was BP, VJ, DJ, BL, DL, LP, SR and VM. Pressures significantly P.05 increased with amount of weight lifted and rose before but peaked after the weight moved. IAP rose earlier and was of greater magnitude than ITP. For the jumps, pressure rose and diminished before the feed lost contact with the ground. Drop-jump height did not affect pressure. Correlation of pressure with weight lifted was fair to good for most activities. Keywords Respiratory system.
- Stress Physiology
- Anatomy and Physiology