Intraabdominal Pressure Response to Loads Applied to the Torso in Normal Subjects

Nd, Grew

doi:10.1097/00007632-198003000-00009

Cited by 37 publications

(11 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Then, external moment producing efforts were simulated by sequentially adding moments in increments of 20 Nm up to 60 Nm about each principal axis direction (flexion, extension, lateral bending and axial torque). The intra-abdominal pressure was therefore 0.6 kPa per Nm when the pressure was 10 kPa and the generated moment was 60 Nm, consistent with observed in human subjects in standing posture by Grew [1980] and by Mairiaux [1988] who reported between 0.4 and 0.7 kPa per Nm for different effort directions. The maximum moment of 60 Nm was selected because it is the mean value for women making maximum voluntary efforts in axial rotation (other effort directions can generate higher moments [Stokes and Gardner-Morse 1995]).…”

Section: Methodssupporting

confidence: 89%

Intra-abdominal pressure and abdominal wall muscular function: Spinal unloading mechanism

Stokes

Gardner‐Morse

Henry

2010

Clinical Biomechanics

View full text Add to dashboard Cite

BACKGROUND The roles of antagonistic activation of abdominal muscles and of intra-abdominal pressurization remain enigmatic, but are thought to be associated with both spinal unloading and spinal stabilization in activities such as lifting. Biomechanical analyses are needed to understand the function of intra-abdominal pressurization because of the anatomical and physiological complexity, but prior analyses have been over-simplified. METHODS To test whether increased intra-abdominal pressure was associated with reduced spinal compression forces for efforts that generated moments about each of the principal axis directions, a previously published biomechanical model of the spine and its musculature was modified by the addition of anatomically realistic three-layers of curved abdominal musculature connected by fascia to the spine. Published values of muscle cross-sectional areas and the active and passive stiffness properties were assigned. The muscle activations were calculated assuming minimized muscle stress and stretch for the model loaded with flexion, extension, lateral bending and axial rotation moments of up to 60 Nm, along with intra-abdominal pressurization of 5 or 10 kPa (37.5 or 75 mmHg) and partial bodyweight (340 N). FINDINGS The analysis predicted a reduction in spinal compressive force with increase in intra-abdominal pressurization from 5 to 10 kPa. This reduction at 60 Nm external effort was 21% for extension effort, 18% for flexion effort, 29% for lateral bending and 31% for axial rotation. INTERPRETATION This analysis predicts that intra-abdominal pressure produces spinal unloading, and shows likely muscle activation patterns that achieve this.

show abstract

Section: Methodssupporting

confidence: 89%

Intra-abdominal pressure and abdominal wall muscular function: Spinal unloading mechanism

Stokes

Gardner‐Morse

Henry

2010

Clinical Biomechanics

View full text Add to dashboard Cite

show abstract

“…Due to the fact that higher IAP is present when the spine is subject to different external moments, the role of LAP must be more complex than the reduction of the extensor moment on the spine (14). Indeed, TA activity is observed with different levels and directions of external moments (34).…”

Section: Discussionmentioning

confidence: 99%

A Finite Element Model Study on the Role of Trunk Muscles in Generating Intra-Abdominal Pressure

Arjmand

Shirazi‐Adl

Parnianpour

2001

Biomed. Eng. Appl. Basis Commun.

View full text Add to dashboard Cite

“…[5][6][7][8][9][10]13,14] and in CAPD patients only during the relaxed state with varying volumes of dialysis solution in the peritoneal cavity [1][2][3][4], The alteration in intraabdominal pressure during coughing, a maneuver frequently recommended to patients during the immedi ate postoperative period, has attracted little attention. We are aware of only one report on intraabdominal pressure during coughing in patients after abdominal surgery [15].…”

Section: Amentioning

confidence: 99%

“…Intraabdom inal pressures in relation to intraperitoneal volumes have been measured in relaxed patients with ascites and in relaxed peritoneal dialysis patients [1 -4]. The influence of some natural movements on intraabdominal pressure was studied in healthy volunteers [5][6][7][8][9][10]. However, there is no available information on intraabdominal pressures during natural activities in patients with intraperitoneal fluid.…”

Section: Introductionmentioning

confidence: 99%

Intraabdominal Pressures during Natural Activities in Patients Treated with Continuous Ambulatory Peritoneal Dialysis

Twardowski¹,

Khanna²,

Nolph³

et al. 1986

Nephron

167

View full text Add to dashboard Cite

Intraabdominal pressures were measured during natural activities in 6 men, age 24–62 years, treated with continuous ambulatory peritoneal dialysis. The pressures were measured with a pressure transducer secured at the level of the umbilicus in the supine, sitting, and upright positions with 0–3 liters intraperitoneal fluid during talking, coughing, straining, changing position, walking, jogging, exercycling, jumping and weight lifting. Coughing and straining generated the highest intraabdominal pressures in every position. The pressures with weight lifting were proportional to the magnitude of the weight lifted up to 50 lbs, but were lower than those during coughing and straining. The pressures were generally higher with greater intraabdominal fluid volumes, especially with jumping and coughing. Exercycling was associated with lower intraabdominal pressure than was jogging, and the pressures were only minimally influenced by intraperitoneal fluid volumes. The results of this study can be used as a guide in establishing preventive measures in patients with intraperitoneal fluid to decrease complication rates related to raised intraabdominal pressures such as dialysate leaks, hernias and hemorrhoids.

show abstract

Intraabdominal Pressure Response to Loads Applied to the Torso in Normal Subjects

Cited by 37 publications

References 0 publications

Intra-abdominal pressure and abdominal wall muscular function: Spinal unloading mechanism

Intra-abdominal pressure and abdominal wall muscular function: Spinal unloading mechanism

A Finite Element Model Study on the Role of Trunk Muscles in Generating Intra-Abdominal Pressure

Intraabdominal Pressures during Natural Activities in Patients Treated with Continuous Ambulatory Peritoneal Dialysis

Contact Info

Product

Resources

About