Peak torque substantially varies between patients with non-specific low back pain; belong to directional preference classification, and healthy individuals-clinical biokinesiologic perspectives

Compensatory biomechanics and spinal loading during dynamic maneuvers in patients with chronic low back pain

Purpose

This study explores the biomechanics underlying the sit-to-stand (STS) functional maneuver in chronic LBP patients to understand how different spinal disorders and levels of pain severity relate to unique compensatory biomechanical behaviors. This work stands to further our understanding of the relationship between spinal loading and symptoms in LBP patients.

Methods

We collected in-clinic motion data from 44 non-specific LBP (NS-LBP) and 42 spinal deformity LBP (SD-LBP) patients during routine clinical visits. An RGB-depth camera tracked 3D joint positions from the frontal view during unassisted, repeated STS maneuvers. Patient-reported outcomes (PROs) for back pain (VAS) and low back disability (ODI) were collected during the same clinical visit.

Results

Between patient groups, SD-LBP patients had 14.3% greater dynamic sagittal vertical alignment (dSVA) and 10.1% greater peak spine torque compared to NS-LBP patients (p < 0.001). SD-LBP patients also had 11.8% greater hip torque (p < 0.001) and 86.7% greater knee torque (p = 0.04) compared to NS-LBP patients. There were no significant differences between patient groups in regard to anterior or vertical torso velocities, but anterior and vertical torso velocities correlated with both VAS (r = − 0.38, p < 0.001) and ODI (r = − 0.29, p = 0.01). PROs did not correlate with other variables.

Conclusion

Patients with LBP differ in movement biomechanics during an STS transfer as severity of symptoms may relate to different compensatory strategies that affect spinal loading. Further research aims to establish relationships between movement and PROs and to inform targeted rehabilitation approaches.

Exploring the impact of physical factors on the overweight and obese physical therapy students

Objective

Physical fitness is a fundamental pillar for physical therapy students in promoting their physical health. Obese and overweight students might have limited physical capabilities. Therefore, we investigated the effect of overweight and obesity on the mobility, strength, and agility of physical therapy students.

Methods

In this cross-sectional study, we collected data from a sample of 13 overweight and 9 obese physical therapy students, aged between 19 and 24 years. We measured spinal, upper, and lower limb mobility; upper body strength (using the flexed-arm hang test), and agility (using the 11 × 10 shuttle sprint test).

Results

The independent sample t test comparing the mean values of overweight and obese participants showed no significant difference [t(20) = -0.16, p > 0.05] for the 11 × 10 shuttle sprint test. However, there was significant difference [t (15.2) = 3.79, p < 0.05] for the flexed-arm hang test. The Pearson's correlation test showed a moderate negative correlation between the body mass index and flexed arm hang [r(20) = -0.62, p < 0.005)], indicating that the participants with higher body mass index tended to hold on for less time during the flexed-arm hang test. The correlation assessment showed weak positive correlation between body mass index and the 11 × 10 shuttle sprint test.

Conclusions

In our study, the obese college students tended to have poor physical factors, especially upper body strength and lower limb mobility, compared with the overweight participants. The obese and overweight college students demonstrate lower physical and functional capabilities.

Physical Performance, Anthropometrics and Functional Characteristics Influence the Intensity of Nonspecific Chronic Low Back Pain in Military Police Officers

Background: Chronic low back pain (CLBP) is a serious problem in Military Police Officers (MPO), which accounts for up to 45% of the sick leave rates. It has been assumed that the strength and the endurance of trunk flexor and extensor muscles are CLPB key factors, but it is not known whether these attributes are related to pain intensity. It was aimed to determine whether the strength and endurance of trunk flexor and extensor muscles differ in MPO with no pain (CON; n = 24), moderate (MOD; n = 42), and severe (SEV; n = 37) nonspecific chronic low back pain (CLBP). Methods: The peak torque and endurance test of trunk flexor (PTF.BM⁻¹) and extensor (PTE.BM⁻¹) muscles were compared. A multiple regression analysis was used to identify pain intensity predictors in all groups (PAIN) and according to pain intensity (MOD and SEV). Results: The PTF.BM⁻¹ was negatively related to pain and was a significant predictor, irrespective of pain intensity (PAIN). Conclusion: When pain intensity was considered the PTF.BM⁻¹ and PTE.BM⁻¹ explained the pain in the MOD, while the PTE.BM⁻¹ and service time explained pain intensity in the SEV. Endurance of the flexor and extensor muscles was not related to pain intensity. These results indicated that training protocols must emphasize specific strengthening routines.