Immediate effects of myofascial release to the pectoral fascia on posture, range of motion, and muscle excitation: a crossover randomized clinical trial.

CONTEXT: Forward shoulder posture (FSP) is a risk factor for shoulder pathology. Manual therapists often use myofascial release (MFR) to elongate restricted pectoral fascia to reduce FSP and improve shoulder function; however, the effects of this treatment approach remain anecdotal. OBJECTIVE: Determine the acute effects of 4-min of MFR, compared to a soft-touch control (CON), to the pectoral fascia on: 1) FSP, 2) shoulder horizontal abduction ROM (HA-ROM), and 3) muscle excitation of the trapezius (upper, middle, lower [UT, MT, LT]) and pectoralis major (PEC). METHODS: Fifty-nine right-handed participants (27 ± 9 years, 30 female) with FSP, but otherwise asymptomatic shoulders participated in a randomized crossover clinical trial by attending two experimental sessions: one MFR and one CON treatment, each administered by a Registered Massage Therapist. FSP, HA-ROM, and muscle excitation during a reaching task, were measured before and after each treatment. RESULTS: There was a significant interaction between treatment and time for FSP (p = .018, ηp = .093) with FSP decreasing from PRE MFR (128 ± 19 mm) to POST MFR (123 ± 19 mm; p < .001, ηp = .420) and PRE CON (126 ± 19 mm) to POST CON (124 ± 18 mm; p < .001, ηp = .191) interventions. There were no significant differences in HA-ROM or muscle excitation. CONCLUSION: Four minutes of MFR or CON to the pectoral fascia acutely reduces FSP.

A Violation of Fitts' Law is Maintained in Ecologically Valid Settings.

A 'violation' of Fitts' Law, or Fitts' Equation, occurs when each potential target location is outlined before and during a reaching movement. Past studies have measured the violation in highly controlled laboratory environments, limiting the generalizability of findings. The purpose of the study was to replicate the violation of Fitts' Equation in the homes of participants using a novel portable apparatus during the COVID-19 pandemic. Movements were measured independently with an accelerometer and touch screen, which allowed for kinematic, temporal, and spatial outcomes to be measured in remote environments. The violation of Fitts' Equation was found with the touch and acceleration measurements and was thus seen in ecologically valid environments. The apparatus used may be used as a model for future field research.

A violation of Fitts' Law occurs when a target range is presented before and during movement.

According to Fitts' Law, the time to reach a target (movement time, MT) increases with distance. A violation of Fitts' Law occurs when target positions are outlined before and during movement, as MTs are not different when reaching to the farthest and penultimate targets. One hypothesis posits that performers cognitively process the edges of a target array before the center, allowing for corrective movements to be completed more quickly when moving to edge targets compared to middle targets. The objective of this study was to test this hypothesis by displaying a target range rather than outlines of individual targets in an effort to identify the effects of array edges. Using a touch-screen laptop, participants (N = 24) were asked to reach to one of three targets which would appear within a presented range. Separately, targets were also presented without a range to determine if the display protocol could evoke Fitts' Law. Movements were assessed with the touch screen and optical position measurement. A main effect was found for relative position within a range (touch: F2,44 = 15.4, p < 0.001, η2p = 0.412; position: F2,40 = 15.6, p < 0.001, η2p = 0.439). As hypothesised, MT to the farthest target in a range was not significantly different than MT to the middle target (touch: p = 0.638, position: p = 0.449). No violation was found when a target range was not presented (touch: p = 0.003, position: p = 0.001). Thus, a target range reproduces the Fitts' Law violation previously documented with individually outlined targets, which supports and extends the discussed hypothesis.

A retrospective analysis of pain changes and opioid use patterns temporally associated with a course of chiropractic care at a publicly funded inner-city facility.

Background: Non-pharmacologic treatment, including chiropractic care, is now recommended instead of opioid prescriptions as the initial management of chronic spine pain by clinical practice guidelines. Chiropractic care, commonly including spinal manipulation, has been temporally associated with reduced opioid prescription in veterans with spine pain. Purpose: To determine if chiropractic management including spinal manipulation was associated with decreased pain or opioid usage in financially disadvantaged individuals utilizing opioid medications and diagnosed with musculoskeletal conditions. Methods: A retrospective analysis of quality assurance data from a publicly funded healthcare facility was conducted. Measures included numeric pain scores of spine and extremity regions across three time points, opioid utilization, demographics, and care modalities. Results: Pain and opioid use significantly decreased concomitant with a course of chiropractic care. Conclusions: A publicly funded course of chiropractic care temporally coincided with statistically and clinically significant decreases in pain and opioid usage in a financially disadvantaged inner-city population.

Contexte: Conformément aux directives de pratique clinique, un traitement non pharmacologique, notamment des soins chiropratiques, à la place de prescriptions d'opioïdes est désormais recommandé dans le traitement initial de la douleur chronique à la colonne vertébrale. Les soins chiropratiques, qui comprennent habituellement la manipulation vertébrale, ont été liés de manière provisoire à une consommation réduite d'opioïdes sur ordonnance chez les vétérans souffrant de douleurs à la colonne vertébrale. Objectif: Déterminer si un traitement chiropratique, y compris la manipulation vertébrale, était lié à une diminution de la douleur ou de la consommation d'opioïdes chez les personnes défavorisées sur le plan financier utilisant des médicaments à base d'opioïdes et souffrant de problèmes musculosquelettiques. Méthodologie: Une analyse rétrospective des données sur l'assurance de la qualité provenant d'un établissement de soins de santé financé par l'État a été menée. Les mesures portaient sur des résultats numériques de la douleur à la colonne vertébrale et des extrémités des membres à trois moments différents, la consommation d'opioïdes, des données démographiques et les modes de soins. Résultats: La douleur et la consommation d'opioïdes ont sensiblement diminué dans le cadre de soins chiropratiques. Conclusions: Une diminution importante de la douleur et de la consommation d'opioïdes observée de façon statistique et clinique a coïncidé de manière provisoire avec des soins chiropratiques financés par l'État dans un groupe de personnes défavorisées sur le plan financier vivant au centre-ville.

Differing Characteristics of Human-Shaped Visual Stimuli Affect Clinicians' Dosage of a Spinal Manipulative Thrust on a Low-Fidelity Model: A Cross-Sectional Study.

OBJECTIVE: The purpose of this study was to determine whether chiropractic clinicians modulate spinal manipulation (SM) thrust characteristics based on visual perception of simulated human silhouette attributes. METHODS: We performed a cross-sectional within-participant design with 8 experienced chiropractors. During each trial, participants observed a human-shaped life-sized silhouette of a mock patient and delivered an SM thrust on a low-fidelity thoracic spine model based on their visual perception. Silhouettes varied on the following 3 factors: apparent sex (male or female silhouette), height (short, average, tall), and body mass index (BMI) (underweight, healthy, obese). Each combination was presented 6 times for a total of 108 trials in random order. Outcome measures included peak thrust force, thrust duration, peak preload force, peak acceleration, time to peak acceleration, and rate of force application. A 3-way repeated measures analysis of variance model was used to for each variable, followed by Tukey's honestly significant difference on significant interactions. RESULTS: Peak thrust force was reduced when apparent sex of the presented silhouette was female (F1,7 = 5.70, P = .048). Thrust duration was largely invariant, except that a BMI by height interaction revealed a longer duration occurred for healthy tall participants than healthy short participants (F4,28 = 4.34, P = .007). Compared to an image depicting obese BMI, an image appearing underweight lead to reduced peak acceleration (F2,5 = 6.756, P = .009). Clinician time to peak acceleration was reduced in short compared to tall silhouettes (t7 = 2.20, P = .032). CONCLUSION: Visual perception of simulated human silhouette attributes, including apparent sex, height, and BMI, influenced SM dose characteristics through both kinetic and kinematic measures. The results suggest that visual information from mock patients affects the decision-making of chiropractic clinicians delivering SM thrusts.

Comparing Two Moderate-to-Vigorous Physical Activity Accelerometer Cut Points in Older Adults With Neck and Back Disabilities Undergoing Exercise and Spinal Manipulation Interventions.

Different techniques used to analyze and reduce accelerometer data may impact its interpretation. To determine which variables were impacted by changing analysis parameters, the authors performed a secondary analysis of data gained from a clinical trial conducted on older adults (aged ≥65 years; M = 71.1 and SD = 5.3; n = 100) with neck and back disabilities and compared the effects of two different cut- point sets (Matthews and Freedson sets) commonly used to analyze older adult accelerometry data. The Matthews set was found to assign significantly greater moderate-to-vigorous physical activity per day than the Freedson set in all comparisons. This suggests that, if moderate-to-vigorous physical activity per unit time is a primary outcome measure, the choice of which analysis method is used should be carefully considered. Further results from analyses of dependent variables, time in moderate-to-vigorous physical activity bouts of >10 min/day, mean bout length, and number of bouts per day are discussed.

Tactile Perception of Pressure and Volitional Thrust Intensity Modulate Spinal Manipulation Dose Characteristics.

OBJECTIVE: The purpose of this study was to examine clinicians' ability to modulate spinal manipulation (SM) thrust characteristics based on their tactile perception of pressure and volitional intensity. METHODS: In a cross-sectional, within-participants design, 13 doctors of chiropractic delivered SM thrusts of perceived least, appropriate, or greatest intensity of their perceived safe output level for an SM thrust on low-fidelity thoracic spine models of 4 different pressure levels. The participants performed SM over the course of 96 trials in a randomized order on combinations of thrust intensity and pressure. Dependent variables included normalized preload force, thrust force, thrust duration, peak acceleration, time to peak acceleration, and displacement. For all dependent measures, 2-factor within-participants analysis of variance models with repeated measures on both factors were performed. RESULTS: Preload force increased with intensity (F2,24 = 9.72; P < .001) and model pressure (F3,36 = 4.27; P = .011). Participants modulated thrust force and displacement as each also increased with intensity escalation (F2,24 = 22.53, P < .001; F2,18 = 45.20, P < .001). The highest accelerations were observed during the greatest intensity. Increased thrust force was delivered at higher model pressures (F3,36 = 6.43; P < .001). A significant interaction demonstrated that as volitional thrust intensity increased, greater displacement was attained, particularly on low pressure models (F6,54 = 11.06; P < .001). Thrust duration and time to peak acceleration yielded no significant differences. CONCLUSION: Spinal manipulation thrust dosage was modulated by the chiropractors' tactile perception of pressure and volitional intensity.