Intramuscular Pressure in the Erector Spinae and Intra-abdominal Pressure Related to Posture and Load

Abstract

Intramuscular pressure measurements in the erector spinae seem to be a valuable tool for quantitating the role of back muscles during different lifting tasks.

Intramuscular pressure, tissue oxygenation and EMG fatigue measured during isometric fatigue-inducing contraction of the multifidus muscle

“…Similarly high pressure values at rest and during contraction are also described in other studies [25,30,37]. As fluctuations of IMP and pO 2 to some extent may exist in skeletal muscles, possible errors due to the measuring technique or the position of the catheter in the muscle can partly explain the wide range of pressure values, however, they do not constitute a sufficient explanation for the absolute values and not at all for the parameter course during exertion.…”

Role of intra-abdominal pressure in the unloading and stabilization of the human spine during static lifting tasks

“…The magnitude of 9 kPa considered in this study for IAP in flexion tasks with load in hands is at the middle range of mean values reported in the literature (1-21 kPa) [2,31,36,44,52,53,55].…”

“…Large scatter also exists in the magnitude of IAP reported for forward-flexed postures; however, there is a general consensus that IAP increases as trunk flexion and moment increase [2,9,21,49,53,55]. The magnitude of 9 kPa considered in this study for IAP in flexion tasks with load in hands is at the middle range of mean values reported in the literature (1-21 kPa) [2,31,36,44,52,53,55].…”

“…In neutral standing posture without carrying any load in hands, IAP has been measured as low as 0.2 kPa [2], 0.3 kPa [46], and 0.98 kPa [55]. The magnitude of 4 kPa considered in this study for IAP in the standing posture with 180 N in hands is in the upper range of reported values ($0.5-4 kPa) [2,53,55]. Different IAP measurement techniques could influence the recorded data [2].…”

“…The magnitude of IAP while holding 180 N in hands was taken as 4 kPa in the standing posture [53] and 9 kPa at trunk flexions of 40°and 65° [31,53] (Table 1). The diaphragm areas and total force magnitudes/lever arms considered in different cases are also listed in Table 1.…”