Low-power Group Research Articles

Minimalist Approach for HoLEP with A Low-Power Holmium Source: A Retrospective Study.

To assess the efficacy and safety of very low-power Holmium Laser Enucleation of the Prostate (HoLEP) on a 30-W holmium laser source. With the approval of the local ethics committee, we retrospectively analysed 60 patients treated with HoLEP. There were 30 patients in the low-power (LP) group and 30 patients in the very low-power (VLP) group. For the LP group, we used a 60-W holmium laser machine. Throughout the en bloc process, we used laser settings of 2 J and 20 Hz. We used a 30-W low-power holmium source in the VLP group. We used laser settings of 2 J and 10 Hz. All patients were operated on by an experienced surgeon. We evaluated the surgical parameters and practicality of the low-power laser vs. the very low-power laser. All patients underwent successful HoLEP in the very low-power group; it was not necessary to increase the output of the laser in any case. Mean preoperatively estimated prostate volume was 88.1 mL (range, 30-300 mL). Mean enucleation time and enucleation efficiency were 67.9 min (range, 25-150 min) and 0.99 gm/min (range, 0.8-1.8 gm/min), respectively. No patient required blood transfusion postoperatively. No stress urinary incontinence (SUI) was observed in the 3rd month postoperative follow-up. The use of a low-power laser source is encouraging for the learning curve of new surgeons who will begin HoLEP surgery; it can facilitate the adoption of HoLEP in developing countries, where the initial capital investment may be a major obstacle.

The Effect of High- and Low-power Holmium Laser Settings for Transurethral Lithotripsy in the Management of Adults with Ureteral Stone.

Since there is insufficient evidence to determine the best treatment of transurethral laser lithotripsy (TLL) in ureteral stones, this study compared the effectiveness and safety of TLL using high-power (HP) (100 W) and low-power (LP) (20 W) laser settings. All patients with maximally sized ureteral stones who were planned for transurethral holmium laser lithotripsy were enrolled in this open study. One of the two laser setting groups-LP or HP-was allocated to each alternate patient. Using IBM SPSS Statistics 24, the treatment groups were compared for operating time, intraoperative and postoperative problems (up to 1 year), and rates of stone-free recovery. Welch tests were employed to compare continuous data, whereas Fisher's exact or Chi-square tests were used to assess categorical variables. At P < 0.05, statistical significance was established. A total of 207 individuals were included and preoperative data were comparable between the two groups. The HP group had a considerably greater ablation rate and a significantly shorter procedure duration (42.61 ± 11.74 min) than the LP group (78.56 ± 25.91 min) ( P = 0.025). The Overactive Bladder Symptom Score and International Prostate Symptom Score were considerably higher in the HP group than in the LP group. Treatment effectiveness was considerably impacted by the location of the ureteral stone, according to univariate and multivariate logistic regression models. A HP laser setting of up to 100 W greatly shortens the duration of the process for treating ureteral stones without raising the risk of problems.

Effect of monopolar diathermy power settings on postoperative pain, wound healing, and tissue damage after tonsillectomy: a randomized clinical trial

This study aimed to assess the impact of varying monopolar diathermy power settings on postoperative pain, hemorrhage, and wound healing following tonsillectomy. A single-center, prospective, randomized, double-blinded, controlled clinical study was conducted. During bilateral tonsillectomy procedures, one tonsil received low-power settings (15 W, cutting/blend) while the other tonsil received high-power settings (35 W, cutting/blend). Postoperative pain scores (0–10) and wound healing scores (0–3) were evaluated immediately after surgery and at 1, 2, and 4 weeks postoperatively using the visual analog scale. Additionally, histological analysis was performed on electrically resected tonsil tissues to assess tissue damage in the tonsil bed. The allocation of high and low power settings to each side was randomized. Results showed that 1 week after the surgery, the high-power group experienced significantly higher pain scores (mean ± standard deviation: 4.84 ± 2.21) compared to the low-power group (3.56 ± 2.24, p = 0.049). Moreover, the high-power side exhibited slower wound healing during the initial 1–2 weeks postoperatively, as indicated by lower wound scores at 2 weeks (high-power: 1.96 ± 0.64; low-power: 2.43 ± 0.59, p = 0.008). Furthermore, histological analysis revealed significantly deeper tissue degradation on the high-power side compared to the low-power side (p < 0.001), with mean depths of 565.2 ± 291.0 µm and 156.0 ± 36.8 µm, respectively. In conclusion, these findings suggest that when employing monopolar diathermy in tonsillectomy, lower power settings can lead to improved outcomes in terms of postoperative pain, wound healing, and tissue damage.Trial registration: CRIS identifier: KCT0005670 (cris.nih.go.kr, registration date: 11/12/2020).

Safety and effectiveness of the first contact force ablation catheter with a flexible tip

Catheter ablation is an established therapy for paroxysmal atrial fibrillation (PAF). The TactiFlex Ablation Catheter, Sensor Enabled (TactiFlex SE) is a next-generation radiofrequency ablation catheter incorporating fiber optics-based contact force-sensing technology with a flexible, laser-cut tip. The study sought to evaluate the safety and effectiveness of the TactiFlex SE ablation catheter for treatment of drug-refractory PAF. The TactiFlex AF investigational device exemption was a prospective, nonrandomized, multicenter clinical study. Enrollment began on June 26, 2020 and completed June 18, 2021. Subjects with PAF underwent de novo pulmonary vein isolation and, if indicated, ablation for typical atrial flutter. Subjects were followed for 12 months. Of the 355 subjects enrolled at 37 sites worldwide, 334 underwent ablation with the TactiFlex SE catheter. The Kaplan-Meier estimate of 12-month freedom from AF/atrial flutter (AFL)/atrial tachycardia recurrence was 72.9% (95% confidence interval [CI] 95% CI 67.2%-77.8%) and clinical success was 83.6% (95% CI 95% CI 78.1%-87.2%). As-treated analyses compared subjects treated at high power (left atrium time-averaged power setting 40-50 W; n = 222) vs low power (<40 W; n = 97). The Kaplan-Meier estimate of 12-month freedom from AF/AFL/atrial tachycardia recurrence was 76.4% (95% CI 69.3%-82.0%) and clinical success was 83.9% (95% CI 77.5%-88.6%) in the high-power group compared with 66.8% (95% CI 56.1%-75.5%) and 80.7% (95% CI 70.8%- 87.5%), respectively, in the low-power group. The primary safety event rate in all treated subjects was 4.3%; 4.1% in the HP group and 5.2% in the LP group (P = .7671). TactiFlex SE is safe and effective for treatment of drug-refractory PAF and concomitant AFL and enables more efficient procedures than previous generation catheters.

Effect of Ho:YAG laser on kidney tissue with Virtual Basket™ and Bubble Blast™ pulse modulation: an experimental ex vivo study.

There is a lack of studies in the literature on effects of Virtual Basket™ (VB) and Bubble Blast™ (BB) laser pulse modulations of the Ho:YAG laser on tissue. We aimed to compare the effects of standard modulation (SM), VB, and BB pulse modulations of Ho:YAG laser on kidney tissue. An ex vivo experiment was conducted using veal kidneys. The Quanta System Cyber Ho 100W laser generator with a broad setting spectrum at 15-80W, 10-40Hz, 1.5-2J, and medium pulse duration were tested. Incision depth (ID), vaporization area (VA), coagulation area (CA), and total laser area (TLA = VA + CA) were evaluated. Histopathological measurement outcomes were grouped as a low-power group (15, 20, and 30 W) and a high-power group (40, 60, and 80W) according to the power outputs used. A total of 108 experiments were performed. In saline and high-power output (40, 60, 80 W), mean VA, TLA, and ID, histopathological measurements were higher in BB pulse modulation than VB and SM pulse modulations (p: 0.03, p: 0.001, and p: 0.003, respectively). In contrast, mean CA and LE measurements were higher in SM than in VB and BB pulse modulations (p < 0.001 and p < 0.001, respectively). There was no statistically significant difference in mean histopathological measurements of VA, CA, TLA, and ID, among SM, VB, and BB pulse modulations in the low-power output group in saline (p > 0.05). VB can allow controlled dissection, as it does not create a large VA during surgical procedures. BB should be used in a controlled manner in soft tissue surgery due to its strong effect on tissues.

Power, Self-Esteem, and Body Image

Abstract: We expected power – the perceived capacity to influence others – to be an antecedent of positive body image because power is closely linked to self-esteem, which in turn is linked to body image. In a cross-sectional study ( N = 318), sense of power was positively related to body appreciation and satisfaction with one’s appearance. Self-esteem partially mediated this effect. In an experimental study ( N = 114), participants assigned to a high-power group indicated more body appreciation, reported more body satisfaction, and estimated themselves to be taller than participants assigned to a low-power group. Self-esteem mediated all the effects. Altogether, power affected body image directly but also indirectly through elevated self-esteem. Implications refer to clinical prevention and intervention programs.

Histological evaluation of vascular changes after excimer laser angioplasty for neointimal formation after bare-metal stent implantation in rabbit iliac arteries.

Excimer laser is used to treat coronary artery disease, especially in case of lesions with thrombus and in-stent restenosis (ISR). However, there are no in vivo preclinical studies that have evaluated the pathological reactions of the vessel wall after excimer laser ablation. Bare-metal stents were placed in the external iliac arteries of six healthy rabbits. Twenty-eight days later, excimer laser ablation was performed with low-power (45 (fluency)/25 (rate)) in one side, and high-power (60/40) in the opposite side, followed by optical coherence tomography (OCT) evaluation. Rabbits were sacrificed 15min after the procedure, and histological assessment was performed. Morphometry analysis of OCT showed similar stent and lumen size between low-power and high-power group. Histological evaluation suggested endothelial cell loss, fibrin deposition, and tissue loss. The low-power group showed significantly less pathological changes compared with the high-power group: angle of endothelial cell loss, 32.4° vs. 191.7° (interquartile range, 8.8°-131.7° vs. 125.7°-279.5°; p < 0.01); fibrin deposition, 1.1° vs. 59.6° (0.0°-70.4° vs. 31.4°-178.4°; p = 0.03); and tissue loss 0.0° vs. 18.2° (0.0°-8.7° vs. 0.0°-42.7°; p = 0.03). The pathological changes in neointima were more prominent after high-power excimer laser ablation than after low-power excimer laser. To improve safety in clinical practice, understanding the pathological changes of tissues after excimer laser in lesions with ISR is essential.

How the construal of power impacts healthy food preference: the mediating role of self-discipline perception

PurposeWith the improvement of consumers' health consciousness, healthy food has attracted great attention in daily consumption. Previous research into the sense of power often distinguishes it into high and low level, ignoring the impact of different construal of power on consumption behaviors. This article divides power into dual construal (responsibility vs opportunity) and aims to examine the differential impacts of the construal of power on healthy food preference.Design/methodology/approachTwo pretests and three formal experiments were conducted to examine the effect of the construal of power on the consumer's healthy food preference, the mediation of self-discipline perception and the moderation of the relative strength of prevention over promotion focus (i.e. RSPPF).FindingsResults indicate that individuals who construe power as responsibility (vs opportunity) exhibit higher self-discipline perception, which in turn leads to greater healthy food preference. However, the main effect above can be weakened among the low-power group. Moreover, the above mediating effect of self-discipline perception is stronger for individuals with higher RSPPF.Originality/valueFirst, based on the binary-construal perspective, this study refines the classification of high power and introduces it into the antecedent research of healthy food preference. Second, this paper reveals the self-discipline perception as the inner mechanism underlying the effect of the construal of power on healthy food preference, while RSPPF as the boundary condition for this mediating mechanism. Moreover, this research also provides practical implications for healthy food enterprises that the construal of power, self-discipline perception and regulatory focus should be taken into consideration in advertising design and healthy product promotion.

Teaming up to traverse loneliness: a co-creative journey toward a home care work model for supporting social participation among older adults

BackgroundParticipatory research is particularly suitable in adressing know-do gaps in health systems. There is a disparity between what is known about the benefits of social participation and home care’s responsibility to provide conditions amenable to older adults’ social participation, and what is accomplished in home care practice. Home care workers are a large, low-power group, whose competences should be better harnessed. We carried out a participatory action research (PAR) project with the goal of generating an improved structure for identifying and alleviating loneliness. This article aims to explore the co-creative process of designing a work model that guides home care workers in supporting social participation among older care recipients.MethodsMultimodal data from 16 PAR workshops with 14 home care workers were described and explored through the ‘recursive PAR process’ and the ‘framework for occupational enablement for change in community practice”.ResultsThe PAR process is outlined through the objectives, activities, and work model, as well as enablement strategies employed throughout the PAR process; as are its opportunities, challenges and implications. The work model describes how care workers can act as discoverers of care recipients’ unmet social needs, employ intentional communication, and link to relevant professions or community services to alleviate loneliness among older home care recipients.ConclusionsThis research process included opportunities of collaborating with enthusiastic and competent home care workers, but also challenges of moving between theory and practice and maintaining active participation between workshops. The resulting work model is in step with the requirements of elderly care, is unique in its field and could comprise a first step toward a more systematic approach of assessing and addressing loneliness. The vivid delineation of the PAR process provided in this paper can aid other researchers in navigating participatory research in home care contexts.

Oppression and resistance – uncovering the relations between anger, humiliation and violent collective action in asymmetric intergroup conflict

ABSTRACT What are the emotional antecedences of support for violent resistance among low-power groups living in conditions of hardship and oppression? Previous studies suggest that emotions such as anger and humiliation can elicit support for violent actions against the oppressor. However, the exact circumstances that make these emotions trigger support for violence within asymmetric conflict remain unclear. To better understand when anger and humiliation experienced by oppressed groups evoke violent political resistance, we conducted a two-wave survey in the Palestinian Territories during relative calm and immediately after a public provocative move made by Israel. Results revealed that for citizens living under oppression, intergroup anger and humiliation are present at relatively high levels even during relative calm. In these day-to-day conditions of oppression, anger, but not humiliation was associated with citizens’ support for violent means of resistance. As anticipated, levels of anger and humiliation surged after Israel’s public conflict aggravation, but the context moderated their effect on support for violence. After the provocation, humiliation elicited support for violence while anger was not associated with such support. Theoretical and applied implications of the detrimental consequences of humiliation are discussed.

Comparison of low power and high power holmium YAG laser settings in flexible ureteroscopy.

To compare the efficacy of conventional low power and high power holmium: yttrium aluminum-garnet (Ho: YAG) laser lithotripsy settings during retrograde intrarenal surgery (RIRS). METHODS: The prospective study was conducted in patients undergoing RIRS for renal stones less than 2cm diameter. Pulsed Ho:YAG laser (Lumenis® Pulse TM P120 H) was used for laser lithotripsy and the patients were randomized into low power (LP) and high power (HP) laser lithotripsy settings groups. The lasing duration, total laser energy used (Joules), laser energy used to ablate 1 mm3 of stone (Joules/mm3), operative duration, stone ablation speed (mm3/s) and stone free rate were compared. A total of 120 underwent RIRS with 63 and 57 patients in LP and HP group, respectively. Median stone volume and stone density were comparable between the groups. The total energy used and laser energy used to ablate 1mm3 of stone (Joules/mm3) were significantly higher in the HP group than in LP group (27.9 (16.4-46.2) J/ mm3 vs 9.7 (5.3-17.7) J/ mm3) (p < 0.01). Median (IQR) ablation speed were 0.8 (0.5-1.3) mm3/s and 0.6 (0.4-1) mm3/s in the LP and HP groups, respectively. The median lasing time, operative time and stone free rate were similar in both the groups. The total energy used and J/mm3 were lower in the LP group than in HP group with similar lasing duration, operative duration, ablation speed and stone free rate for renal stones less than 2cm.

Weak Association Between Vastus Lateralis Muscle Fiber Composition and Fascicle Length in Young Untrained Females.

The aim of the study was to investigate the relationships between vastus lateralis muscle fiber length and fiber type composition in individuals with minimal exposure to systematic resistance/power training. In sixty female physical education students (age: 21.03 ± 2.1 years, body weight: 59.8 ± 9.7 kg, body height: 166.2 ± 6.5 cm), with no experience in systematic training, lean body mass, VL muscle architecture and fiber composition type, countermovement jumping (CMJ) performance, and isometric leg press rate of force development were evaluated. Data were analyzed for all participants, as well as two equally numbered groups assigned according to their maximum countermovement jumping power (High-Power or Low-Power group). Significant but low correlations were found between type II muscle fiber percentage and fascicle length (N = 60, p < 0.05). Significant correlations were found between type IIa and IIx muscle fiber percentage cross-sectional area (%CSA) and fascicle length (N = 60; r = 0.321, and r = 0.378; respectively, p < 0.05). These correlations were higher for the High-Power group (r = 0.499, and r = 0.522; respectively, p < 0.05), and lower, and nonsignificant, for the Low-Power group. The best predictor of strength/power performance was the lean body mass of the lower extremities (r = 0.389–0.645, p < 0.05). These results suggest that in females with minimal exposure to systematic training, fascicle length may be weakly linked with type II fiber areas, only in females with high-power profiles.

Comparison of efficacy and safety of high-intensity focused ultrasound at different powers for patients with vulvar lichen simplex chronicus

Objective To compare the efficacy and safety of the treatment of vulvar lichen simplex chronicus (VLSC) using high-intensity focused ultrasound (HIFU) at different powers. Methods This retrospective study included 152 patients with VLSC. Among these patients, 70 were treated with HIFU at low power (level 2), and 82 were treated at normal power (level 3). The treatment responses, recurrence rates and intra- and postoperative complications were all compared. Results No statistically significant differences were found between the two groups in age, disease course, menopause status, lesion size and severity of symptoms. All patients received one session of HIFU therapy, and the treatment process was successful. No difference was found in the total response rate between the two groups at 1 (85.7% versus 87.8%, p = .35), 6 (80% versus 80.5%, p = .65) and 12 (80% versus 80.5%, p = .73) months after HIFU therapy. No significant difference was observed in the recurrence rate between the two groups at 6 (5.7% versus 9.8%, p = .36) and 12 (22.9% versus 26.8%, p = .57) months after HIFU treatment. Patients in the low-power group had a lower incidence of blisters (10% versus 23.3%, p = .04). Conclusion Based on our results, low-power HIFU treatment can achieve a therapeutic effect similar to normal power HFU treatment for VLSC, but its incidence of side effects is lower.

Determining our destiny: Do restrictions to collective autonomy fuel collective action?

Groups experience collective autonomy restriction whenever they perceive that other groups attempt to limit the freedom of their group to determine and express its own identity. We argue that collective autonomy restriction motivates groups (both structurally advantaged and disadvantaged) to improve their power position within the social hierarchy. Four studies spanning real-world (Studies 1 and 2) and lab-based (Studies 3 and 4) intergroup contexts supported these ideas. In Study 1 (N = 311), Black Americans' (a relatively disadvantaged group) experience of collective autonomy restriction was associated with greater support for collective action, and less system justification. In Study 2, we replicated these findings with another sample of Black Americans (N = 292). We also found that collective autonomy restriction was positively associated with White Americans' (a relatively advantaged group, N = 294) support for collective action and ideologies that bolster White's dominant position. In Study 3 (N = 387, 97 groups), groups that were susceptible to being controlled by a high-power group (i.e., were of low structural power) desired group power more when their collective autonomy was restricted (vs. supported). In Study 4 (N = 803, 257 groups) experiencing collective autonomy restriction (vs. support) increased low-power group members' support of collective action, decreased system justification, and evoked hostile emotions, both when groups were and were not materially exploited (by being tasked with more than their fair share of work). Across studies, we differentiate collective autonomy restriction from structural group power, other forms of injustice, group agency, and group identification. These findings indicate that collective autonomy restriction uniquely motivates collective behavior. (PsycInfo Database Record (c) 2020 APA, all rights reserved).

Lay theories of peace and their influence on policy preference during violent conflict

We often talk about peace as if the concept is self-explanatory. Yet people can have various theories about what peace "is." In this study, we examine the lay theories of peace of citizens embroiled in a prolonged ethnonational conflict. We show that lay theories of peace 1) depend on whether one belongs to the high-power or low-power party and 2) explain citizens' fundamental approaches to conflict resolution. Specifically, we explore the link between power asymmetry, lay theories of peace, and preference for conflict resolution strategies within large-scale samples of Palestinian residents of the West Bank and the Gaza Strip and Jewish residents of Israel. Results reveal that members of the high-power group (in this case Jewish-Israelis) are more likely to associate peace with harmonious relationships (termed "positive peace") than with the attainment of justice (termed "structural peace"), while members of the low-power group (in this case Palestinians) exhibit an opposite pattern. Yet both groups firmly and equally interpret peace as the termination of war and bloodshed (termed "negative peace"). Importantly, across societies, associating peace with negative peace more than with positive or structural peace predicts citizens' desire for a solution that entails the partition of land (the Two-State Solution) whereas associating peace with structural or positive peace more than with negative peace predicts citizens' desire to solve the conflict by sharing the land (the One-State Solution). This study demonstrates the theoretical and policy-relevant utility of studying how those most affected by war understand the concept of peace.

Cross-domain certificateless authenticated group key agreement protocol for 5G network slicings

Network slicing technology is a core part of 5G network, which enables users to access the suitable network on demand and increases the flexibility of network resources through appropriate network configuration. However, the group users in dynamic 5G network slices face communication security threats (impersonation attack, network monitoring, identity leakage, etc.). Group key agreement (GKA) protocol can be used to ensure the security of communication for group users. However, most GKA protocols do not consider cross-domain environment, or use the same cryptographic system parameters between all communication nodes in cross-domain environment. This study presents a cross-domain certificateless authenticated GKA protocol for 5G network slicings supporting dynamic group users management. This new scheme only needs one-round communication and allows group users from different network domains with different cryptographic system parameters to agree on a group session key in common. The proposed scheme not only can provide authenticated key agreement security, mutual authentication, perfect forward secrecy, user anonymity and partial private key transmission security, but also is able to withstand the impersonation, replay and known temporary key attacks. As compared with existing three certificateless group key agreement protocols, our proposed scheme has less computation time, and the communication overhead of low-power group user in our proposed is reduced by at least 36%.

The interplay of management response and individual power in digital service environments from a bystander's perspective

PurposeThis study aims to investigate bystanders' perceptions and reactions to management responses to consumer complaints through digital service channels. Specific purposes are to examine how management response (i.e. warmth, competence) and individual differences (i.e. bystander power) work together to influence bystanders' information processing of service recovery.Design/methodology/approachThis research consists of two main studies which employed web-based experiments. Both studies used a 2 (management response: warmth vs competence) × 2 (individual power: low vs high) between-subjects design. A total of 240 participants were recruited from Amazon's Mechanical Turk platform in Study 1, and 233 participants were recruited from a market research company in Study 2.FindingsStudy 1 suggested that for the high-power group, warmth-related responses increased service perceptions (perceived diagnosticity and perceived fairness), and for low-power group, competence-related responses enhanced service perceptions. Study 2 confirmed the results of Study 1 and further demonstrated bystanders' service perceptions as the underlying mechanisms to connect the interactive effect of management response and individual power on satisfaction with complaint handling and WOM intentions.Practical implicationsThe current research demonstrates how companies can effectively manage customers' experiences (i.e. bystanders' experiences) with service recovery management on digital platforms by demonstrating effective management responses to consumer complaints through digital service channels.Originality/valueTo the best of our knowledge, this is the first study that explores bystanders' individual characteristics related to the information processing of service recovery through digital service channels.

Resisted Sprint Velocity in Female Soccer Players: Influence of Physical Capacities

This study aimed to examine the effects of different sled overloads on maximum sprint velocity achieved by female soccer players with different strength, speed, and power levels. Twenty elite female soccer players from the same club participated. On the same day, athletes performed: linear and resisted-sprint tests with 30 and 60 % of body-mass over 5-, 10-, and 20-m; half-squat maximum bar-power output, and half-squat one-repetition maximum assessment. A median split analysis was used to divide players into two groups according to their velocity, half-squat one-repetition maximum, and half-squat power. Differences in percentage decreases between unresisted- and resisted-sprints comparing higher and lower groups were analyzed using magnitude-based inferences. Overall, the stronger, faster, and more powerful players were less affected by both loads, as demonstrated by their lower decreases in velocity over the different distances. However, half-squat power appeared to be more sensitive for indicating impairments in resisted-sprint performance, due to meaningful differences in percentage decreases observed between higher and lower power groups. Notably, overloads of 30 and 60% of body-mass provoked substantial reductions in resisted-sprint velocity (~22.9% for 30% and ~51.4% for 60% of body-mass, relative to unresisted-sprint velocity). Athletes with superior power levels are less affected by the progressive sled overloading.

Determining the Optimum Bar Velocity in the Barbell Hip Thrust Exercise.

To identify the bar velocities that optimize power output in the barbell hip thrust exercise. A total of 40 athletes from 2 sports disciplines (30 track-and-field sprinters and jumpers and 10 rugby union players) participated in this study. Maximum bar-power outputs and their respective bar velocities were assessed in the barbell hip thrust exercise. Athletes were divided, using a median split analysis, into 2 groups according to their bar-power outputs in the barbell hip thrust exercise ("higher" and "lower" power groups). The magnitude-based inferences method was used to analyze the differences between groups in the power and velocity outcomes. To assess the precision of the bar velocities for determining the maximum power values, the coefficient of variation (CV%) was also calculated. Athletes achieved the maximum power outputs at a mean velocity, mean propulsive velocity, and peak velocity of 0.92 (0.04)m·s-1 (CV: 4.1%), 1.02 (0.05)m·s-1 (CV: 4.4%), and 1.72 (0.14)m·s-1 (CV: 8.4%), respectively. No meaningful differences were observed in the optimum bar velocities between higher and lower power groups. Independent of the athletes' power output and bar-velocity variable, the optimum power loads frequently occur at very close bar velocities.

The Harmful Side of Thanks: Thankful Responses to High-Power Group Help Undermine Low-Power Groups' Protest.

Giving thanks has multiple psychological benefits. However, within intergroup contexts, thankful responses from low-power to high-power group members could solidify the power hierarchy. The other-oriented nature of grateful expressions could mask power differences and discourage low-power group members from advocating for their ingroup interests. In five studies (N = 825), we examine the novel idea of a potentially harmful side of “thanks,” using correlational and experimental designs and a follow-up. Across different contexts, expressing thanks to a high-power group member who transgressed and then helped undermined low-power group members’ protest intentions and actual protest. Thus, the expression of thanks can pacify members of low-power groups. We offer insights into the underlying process by showing that forgiveness of the high-power benefactor and system justification mediate this effect. Our findings provide evidence for a problematic side of gratitude within intergroup relations. We discuss social implications.