Lower Back Injury Prevention and Sensitization of Hip Hinge with Neutral Spine Using Wearable Sensors during Lifting Exercises

The popularization and industrialization of fitness over the past decade, with the rise of big box gyms and group classes, has reduced the quality of the basic formation and assessment of practitioners, which has increased the risk of injury. For most lifting exercises, a universal recommendation is maintaining a neutral spine position. Otherwise, there is a risk of muscle injury or, even worse, of a herniated disc. Maintaining the spine in a neutral position during lifting exercises is difficult, as it requires good core stability, a good hip hinge and, above all, observation of the posture in order to keep it correct. For this reason, in this work the authors propose the prevention of lumbar injuries with two inertial measurement units. The relative rotation between two sensors was measured for 39 voluntary subjects during the performance of two lifting exercises: the American kettlebell swing and the deadlift. The accuracy of the measurements was evaluated, especially in the presence of metals and for fast movements, by comparing the obtained results with those from an optical motion capture system. Finally, in order to develop a tool for improving sport performance and preventing injury, the authors analyzed the recorded motions, seeking to identify the most relevant parameters for good and safe lifting execution.

Quantifying Lumbar Movement Patterns of Allied Health Professionals in an Australian Health Care Facility

Health professionals responsible for return to work plans have little data about allied health movement to guide recommendations following lower back injury. This study aimed to quantify the lumbar movement patterns of allied health professionals within a health care facility throughout a normal workday. An observational case study was undertaken at a public health care facility with 122 allied health professionals. The lumbar movements were recorded with the ViMove together with pain scale measurement. The mean (SD) recording time for allied health was 7.7 (0.7) hours. A mean (SD) 3 (1.4) hours total were spent in standing, 3.8 (1.7) hours in sitting, and 0.8 (0.4) hours in locomotion. Forty-nine flexions were recorded on average per session, most identified as short term (<30 s) within low range (0°–20°). Lumbar movement patterns differed among professions. Thirty-seven (31%) participants reported a history of lower back injury, and 57 (47%) reported low back pain at the end of their workday. This study provides an insight into allied health professionals’ back movement in a hospital or community-based health care setting. These data may inform those who make return to work recommendations or provide rehabilitation services for allied health professionals working with a lower back injury.

Flexibility Measurement Affecting the Reduction Pattern of Back Muscle Activation during Trunk Flexion

Numerous studies have been conducted on lower back injury caused by deeper stooped posture, which is associated with the back muscle flexion–relaxation phenomenon (FRP). Individual flexibility also affects FRP; individuals with high flexibility have the benefit of delayed FRP occurrence. This study attempted to determine the most efficient measurement of flexibility for evaluating the occurrence and degree of FRP when participants flexed their trunk forward. We recruited 40 male university students who were grouped on the basis of three flexibility measurements (toe-touch test, TTT; sit-and-reach test, SRT; modified Schober’s test, MST) into three levels (high, middle and low). Muscle activation (thoracic and lumbar erector spinae, TES and LES, respectively; hamstring, HMS) and lumbosacral angle (LSA) were recorded when the trunk flexed forward from 0° (upright) to 15°, 30°, 45°, 60°, 75° and 90°. The results indicated that trunk angle had a significant effect on three muscle activation levels and LSA. The effects of muscles and LSA varied depending on flexibility measurement. TTT significantly discriminated LES electromyography findings between high and low flexibility groups, whereas MST and SRT distinguished between high and non-high flexibility groups. The TTT values positively correlated with the time of LES FRP occurrence, showing that the higher the TTT, the slower the occurrence of FRP. This is beneficial in delaying or avoiding excessive loading on the passive tissue of the lumbar spine when performing a deeper trunk flexion.

Mining-Related Lower Back Injuries and the Compensation Process: An Injured Worker’s Journey

Background: In Ontario, when an occupational injury occurs in the mining industry, there is often a need to interact with the Workplace Safety and Insurance Board (WSIB). During this process, miners experience economic, social, and mental health–related issues that can affect their overall well-being. This study aimed to determine the impact of a lower back injury and the WSIB claim process experience expressed by some male, underground miners in Sudbury, Ontario, Canada. Methods: A qualitative descriptive study design that utilized in-depth, individual qualitative interviews was conducted. Twelve male participants (underground miners) were interviewed in Sudbury, Ontario. Interviews were transcribed and thematically analyzed. Findings: The results emphasized the need for improved communication, the necessity for resources to be allocated to enhance public discussion about injury prevention, the social and economic burden that miners and their families face, and the power imbalances between injured miners and the companies that were meant to support them. Conclusion/Application to Practice: The findings indicate that several areas require improvement for an injured miner who submits a WSIB claim. Ideally, participants wanted an improved and streamlined process for reporting an injury and for WSIB claim management. These findings suggest that occupational health practices that foster a safe and healthy work environment in the mining industry must be promoted, which will help to guide future policies that enhance support for an injured worker and the WSIB claim process.

Lumbar Sagittal Plane Spinal Curvature and Junior-Level Cricket Players

Lumbar lordosis may be a risk factor for injury in junior-level athletes involved in sport which requires excessive amounts of extension. The purpose of this study was to examine the relationship between lumbar lordosis in junior-level cricket players with and without previous low back injury. Results demonstrated a statistically significant difference in lumbar lordosis between the two groups (LBI = 42.53 ± 9.10°; no LBI = 30.33 ± 8.36°; p < .01), with previous lower back injury accounting for 32% variation in lumbar lordosis (p < .01). The results indicate lumbar lordosis may be an issue worth examining in those athletes who partake in sports which have high levels of extension; but, as there is no accepted definition to lumbar postures, it is difficult to accurately interpret measurement results.

Side-to-side asymmetry in absolute and relative muscle thickness of the lateral abdominal wall in cricket pace bowlers

Background. The abdominal musculature plays a protective role against lower-back injury. Knowledge of the asymmetry in abdominal wall thickness in healthy, injury-free cricket pace bowlers may provide a useful platform against which pathology could be assessed and the effects of training could be evaluated.Objective. To compare side-to-side differences in absolute muscle thickness and activity of the abdominal musculature and to compare these measurements at the start, with those at the end of a cricket season among a group of amateur pace bowlers.Methods. This was a controlled longitudinal prospective study. Rehabilitative ultrasound imaging was used to assess abdominal muscle thickness in 26 right-handed, injury-free cricket pace bowlers at the start and at the end of a cricket season. Thickness measurements were done at rest, during an abdominal drawing-in manoeuvre (ADIM) and the active straight-leg raise (ASLR) on the left (-L) and right (-R).Results. The absolute thickness of the non-dominant obliquus abdominis internus (OI) was higher than that of the dominant OI at the start (p=0.001; ES=0.87) as well as at the end of the cricket season (p=0.001; ES 1.09). At the start of the season, the percentage change during the ADIM, thus muscle activity, was higher for the non-dominant OI than for the dominant OI (p=0.02; ES=0.51). Absolute thickness of the dominant obliquus abdominis externus (OE) at rest was significantly higher at the end of the season compared with the start of the season (p=0.0001; ES=0.85). During ASLR-R, the activity of the left transversus abdominis (TA) was significantly higher than that of the right TA during ASLR-L (p=0.03) when measured at the end of the season.Conclusion. This study highlights the possible muscle adaptations in absolute muscle thickness and activity as a consequence of the asymmetrical bowling action.

Side-to-side asymmetry in absolute and relative muscle thickness of the lateral abdominal wall in cricket pace bowlers

Background. The abdominal musculature plays a protective role against lower-back injury. Knowledge of the asymmetry in abdominal wall thickness in healthy, injury-free cricket pace bowlers may provide a useful platform against which pathology could be assessed and the effects of training could be evaluated.Objective. To compare side-to-side differences in absolute muscle thickness and activity of the abdominal musculature and to compare these measurements at the start, with those at the end of a cricket season among a group of amateur pace bowlers.Methods. This was a controlled longitudinal prospective study. Rehabilitative ultrasound imaging was used to assess abdominal muscle thickness in 26 right-handed, injury-free cricket pace bowlers at the start and at the end of a cricket season. Thickness measurements were done at rest, during an abdominal drawing-in manoeuvre (ADIM) and the active straight-leg raise (ASLR) on the left (-L) and right (-R).Results. The absolute thickness of the non-dominant obliquus abdominis internus (OI) was higher than that of the dominant OI at the start (p=0.001; ES=0.87) as well as at the end of the cricket season (p=0.001; ES 1.09). At the start of the season, the percentage change during the ADIM, thus muscle activity, was higher for the non-dominant OI than for the dominant OI (p=0.02; ES=0.51). Absolute thickness of the dominant obliquus abdominis externus (OE) at rest was significantly higher at the end of the season compared with the start of the season (p=0.0001; ES=0.85). During ASLR-R, the activity of the left transversus abdominis (TA) was significantly higher than that of the right TA during ASLR-L (p=0.03) when measured at the end of the season.Conclusion. This study highlights the possible muscle adaptations in absolute muscle thickness and activity as a consequence of the asymmetrical bowling action.

Cumulative Effect of Repeated Impacts on Lumbar Intervertebral Disc Mechanics: A Diurnal Cycle Study

In the U.S. Navy, high speed boat (HSB) crewman frequently suffer from lower back pain and accelerated intervertebral disc (IVD) degeneration. It is believed that this stems primarily from the large vertical accelerations and forces experienced while navigating on the open seas as the boats pitch and crash into the water. In a study of self-reported injuries for HSB operators, 33.6% of these subjects had suffered a lower back injury while on duty3. This is high when compared with the 15 to 20% of adults in the general population who experience low back pain.

Analysis of the Intervertebral Disc’s Mechanical Behavior Under Impact Loading Conditions

In the U.S. Navy, high speed boat (HSB) crewman frequently suffer from lower back pain and accelerated intervertebral disc (IVD) degeneration. It is believed that this stems primarily from the large vertical accelerations and forces experienced while navigating on the open seas as the boats pitch and crash into the water. In a study of self-reported injuries for HSB operators, 33.6% of these subjects had suffered a lower back injury while on duty3. This is high when compared with the 15 to 20% of adults in the general population who experience low back pain.