GLORIA

GEOMAR Library Ocean Research Information Access

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Online Resource
    Online Resource
    SAGE Publications ; 2022
    In:  The American Journal of Sports Medicine Vol. 50, No. 1 ( 2022-01), p. 238-247
    In: The American Journal of Sports Medicine, SAGE Publications, Vol. 50, No. 1 ( 2022-01), p. 238-247
    Abstract: Over the past decade, research has attempted to elucidate the cause of throwing-related injuries in the baseball athlete. However, when considering the entire kinetic chain, full body mechanics, and pitching cycle sequencing, there are hundreds of variables that could influence throwing arm health, and there is a lack of quality investigations evaluating the relationship and influence of multiple variables on arm stress. Purpose: To identify which variables have the most influence on elbow valgus torque and shoulder distraction force using a statistical model and a machine learning approach. Study Design: Cross-sectional study; Level of evidence, 3. Methods: A retrospective review was performed on baseball pitchers who underwent biomechanical evaluation at the university biomechanics laboratory. Regression models and 4 machine learning models were created for both elbow valgus torque and shoulder distraction force. All models utilized the same predictor variables, which included pitch velocity and 17 pitching mechanics. Results: The analysis included a total of 168 high school and collegiate pitchers with a mean age of 16.7 years (SD, 3.2 years) and BMI of 24.4 (SD, 1.2). For both elbow valgus torque and shoulder distraction force, the gradient boosting machine models demonstrated the smallest root mean square errors and the most precise calibrations compared with all other models. The gradient boosting model for elbow valgus torque reported the highest influence for pitch velocity (relative influence, 28.4), with 5 mechanical variables also having significant influence. The gradient boosting model for shoulder distraction force reported the highest influence for pitch velocity (relative influence, 20.4), with 6 mechanical variables also having significant influence. Conclusion: The gradient boosting machine learning model demonstrated the best overall predictive performance for both elbow valgus torque and shoulder distraction force. Pitch velocity was the most influential variable in both models. However, both models also revealed that pitching mechanics, including maximum humeral rotation velocity, shoulder abduction at foot strike, and maximum shoulder external rotation, significantly influenced both elbow and shoulder stress. Clinical Relevance: The results of this study can be used to inform players, coaches, and clinicians on specific mechanical variables that may be optimized to mitigate elbow or shoulder stress that could lead to throwing-related injury.
    Type of Medium: Online Resource
    ISSN: 0363-5465 , 1552-3365
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2022
    detail.hit.zdb_id: 2063945-4
    SSG: 31
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 2
    In: Orthopaedic Journal of Sports Medicine, SAGE Publications, Vol. 9, No. 11 ( 2021-11-01), p. 232596712110566-
    Abstract: A comprehensive understanding of lifestyle (health conditions and substance use), health-related quality of life (HRQoL), flourishing (holistic representation of health), and physical activity can inform stakeholders (players, coaches, and clinicians) and help improve long-term health across the life span. Purpose: To describe health conditions (comorbidities or diagnoses), substance use, physical activity, HRQoL, and flourishing in current and former collegiate and professional baseball players and to assess the relationship between playing position and HRQoL/flourishing in former baseball players. Study Design: Descriptive epidemiology study. Methods: Eligible participants were those ≥18 years old with ≥1 season of collegiate or professional baseball experience. Participants completed a survey on health conditions (asthma, diabetes, hypertension, hypercholesterolemia, and depression), substance use (tobacco, alcohol, and energy drinks), physical activity (International Physical Activity Questionnaire–Short Form), HRQoL (Veterans Rand 12-Item Health Survey [VR-12] physical and mental component scores), and flourishing (Flourishing Scale). Adjusted multivariable regressions were performed for HRQoL and flourishing. Results: Overall, 260 baseball players opened the survey, and 214 (current players, 97; former players, 117) participated for an 82% response rate. Of the former players, 32% had hypertension or hypercholesterolemia. In addition, 26% of current players had used smokeless tobacco (median, 3 years; interquartile range [IQR], 1-5 years) as compared with 34% of former players (median, 15 years; IQR, 5-25 years). In addition, 14% of current players had used electronic cigarettes (median, 2 years; IQR, 0-4 years) as opposed to 3% of former (median, 3 years; IQR, 2-4 years). Energy drinks were consumed by 31% and 14%, respectively, of current and former players on at least a weekly basis. Current baseball players performed 8667 metabolic equivalents per week of physical activity as opposed to 3931 in former players. Pitching was associated with worse VR-12 Mental Component Scores (–5.0; 95% confidence interval, –9.0 to –1.0). Playing position was not related to VR-12 Physical Component Scores or flourishing in former baseball players. Conclusion: The similar smokeless tobacco prevalence between current and former baseball players suggests that they may start using tobacco products during baseball participation and continue after retirement. Similar reported HRQoL as compared with the general US population and high flourishing and physical activity levels suggest that baseball players may present with good musculoskeletal and psychological health.
    Type of Medium: Online Resource
    ISSN: 2325-9671 , 2325-9671
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2021
    detail.hit.zdb_id: 2706251-X
    SSG: 31
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 3
    In: Orthopaedic Journal of Sports Medicine, SAGE Publications, Vol. 7, No. 4 ( 2019-04-01), p. 232596711983999-
    Abstract: Few large-scale series have described functional outcomes after distal triceps tendon repair. Predictors for operative success and a comparative analysis of surgical techniques are limited in the reported literature. Purpose: To evaluate short-term to midterm functional outcomes after distal triceps tendon repair in a broad patient population and to comparatively evaluate patient-reported outcomes in patients with and without pre-existing olecranon enthesopathy while also assessing for modifiable risk factors associated with adverse patient outcomes and/or revision surgery. Study Design: Case series; Level of evidence, 4. Methods: This study was a retrospective analysis of 69 consecutive patients who underwent surgical repair of distal triceps tendon injuries at a single institution. Demographic information, time from injury to surgery, mechanism of injury, extent of the tear, pre-existing enthesopathy, perioperative complications, and validated patient-reported outcome scores were included in the analysis. Patients with a minimum of 1-year follow-up were included. Results: The most common mechanisms of injury were direct elbow trauma (44.9%), extension/lifting exercises (20.3%), overuse (17.4%), and hyperflexion or hyperextension (17.4%). Eighteen patients were identified with pre-existing symptomatic enthesopathy, and 51 tears were caused by an acute injury. A total of 36 complete and 33 partial tendon tears were identified. Bone tunnels were most commonly used (n = 30; 43.5%), while direct sutures (n = 23; 33.3%) and suture anchors (n = 13; 18.8%) were also used. Perioperative complications occurred in 21.7% of patients, but no patients experienced a rerupture at the time of final follow-up. No statistically significant relationship was found between patient age ( P = .750), degree of the tear ( P = .613), or surgical technique employed ( P = .608) and the presence of perioperative complications. Conclusion: Despite the heightened risk of perioperative complications after primary repair of distal triceps tendon injuries, the current series found favorable functional outcomes and no cases of reruptures at short-term to midterm follow-up. Furthermore, age, surgical technique, extent of the tear, and mechanism of injury were not associated with adverse patient outcomes in this investigation. Pre-existing triceps enthesopathy was shown to be associated with increased complication rates.
    Type of Medium: Online Resource
    ISSN: 2325-9671 , 2325-9671
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2019
    detail.hit.zdb_id: 2706251-X
    SSG: 31
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 4
    Online Resource
    Online Resource
    SAGE Publications ; 2018
    In:  Orthopaedic Journal of Sports Medicine Vol. 6, No. 7_suppl4 ( 2018-07-01), p. 2325967118S0016-
    In: Orthopaedic Journal of Sports Medicine, SAGE Publications, Vol. 6, No. 7_suppl4 ( 2018-07-01), p. 2325967118S0016-
    Abstract: The purpose of this study is to describe the clinical, functional, and patient-reported outcomes of distal triceps tendon repairs, as well as to describe perioperative risk profile and re-rupture rates among those with or without pre-existing enthesopathy. Methods: Patients who underwent surgical repair of traumatic triceps tendon injuries between 2008 and 2016 were identified from the surgical database at a single institution. The electronic medical records were queried to determine demographic information, time from injury, mechanism of injury, extent of tear, pre-existing enthesopathy, and postoperative complications. Patients with arthritis, concomitant ligament surgery, and/or secondary rupture following previous elbow surgery were excluded. Follow-up outcome measures included the Mayo Elbow, Disabilities of the Arm, Hand, and Shoulder (QuickDASH), Veterans RAND (VR/SF-12), and Kerlan-Jobe Orthopaedic Clinic (KJOC) scores with a minimum of 1-year follow up. Results: A total of 88 patients (83 males, 5 females) with mean age of 47 years (range, 14-74) were identified with distal triceps tendon repairs at an average of 49 days (range, 1 to 3650 days) after injury. Sixty-nine patients (76.1%) returned for follow-up at average 3.99 years post-operatively (SD, 2.51). The most common mechanisms of injury were direct elbow trauma (45.4%), extension/lifting exercises (18.1%), overuse (13.6%), and hyperflexion or hyperextension (14.8%). Twenty patients were identified with pre-existing, symptomatic enthesophytes, and 68 tears were caused by acute injury; A total of 42 and 46 partial tendon tears were identified (Table 1). Bone tunnels were most commonly used (n=42, 47.7%), while direct sutures (n=31, 35.2%) and suture anchors (n=12, 13.6%) were also used. Postoperative complications occurred in 23.9% of patients, but no patients experienced re-rupture at time of final follow-up. Final postoperative patient-reported outcome measures are noted in Table 1. No statistically significant correlation was found between patient age (p=0.750), degree of tear (p=0.870), or surgical technique (p=0.740) and presence of perioperative complications. Conclusion: Despite heightened risk of perioperative complications after primary repair of distal triceps tendon injuries, the current series identifies favorable functional outcomes and no cases of re- rupture at short- to mid-term follow-up. Furthermore, age, surgical technique, and extent of tear were not associated with adverse patient outcomes in this investigation. [Table: see text]
    Type of Medium: Online Resource
    ISSN: 2325-9671 , 2325-9671
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2018
    detail.hit.zdb_id: 2706251-X
    SSG: 31
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 5
    Online Resource
    Online Resource
    SAGE Publications ; 1986
    In:  The Journal of Early Adolescence Vol. 6, No. 2 ( 1986-06), p. 119-121
    In: The Journal of Early Adolescence, SAGE Publications, Vol. 6, No. 2 ( 1986-06), p. 119-121
    Abstract: Berzonsky (1986), in elaborating on the discovery and creation (construction) metaphors for identity formation, has not accurately represented my views on two key points: (1) the implications of the discovery metaphor regarding personal responsibility and accountability, and (2) the possibility of conducting scientific research involving metaphors for psychological processes. Our contrasting perspectives on these issues are discussed.
    Type of Medium: Online Resource
    ISSN: 0272-4316 , 1552-5449
    Language: English
    Publisher: SAGE Publications
    Publication Date: 1986
    detail.hit.zdb_id: 2011499-0
    SSG: 5,2
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 6
    Online Resource
    Online Resource
    SAGE Publications ; 1990
    In:  Progress in Human Geography Vol. 14, No. 2 ( 1990-06), p. 237-260
    In: Progress in Human Geography, SAGE Publications, Vol. 14, No. 2 ( 1990-06), p. 237-260
    Type of Medium: Online Resource
    ISSN: 0309-1325 , 1477-0288
    RVK:
    Language: English
    Publisher: SAGE Publications
    Publication Date: 1990
    detail.hit.zdb_id: 1501497-6
    detail.hit.zdb_id: 131842-1
    SSG: 14
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 7
    Online Resource
    Online Resource
    SAGE Publications ; 2021
    In:  Orthopaedic Journal of Sports Medicine Vol. 9, No. 7 ( 2021-07-01), p. 232596712110152-
    In: Orthopaedic Journal of Sports Medicine, SAGE Publications, Vol. 9, No. 7 ( 2021-07-01), p. 232596712110152-
    Abstract: Although lower extremity biomechanics has been correlated with traditional metrics among baseball players, its association with advanced statistical metrics has not been evaluated. Purpose: To establish normative biomechanical parameters during the countermovement jump (CMJ) among Major League Baseball (MLB) players and evaluate the relationship between CMJ-developed algorithms and advanced statistical metrics. Study Design: Cohort study; Level of evidence, 3. Methods: MLB players in 2 professional organizations performed the CMJ at the beginning of each baseball season from 2013 to 2017. We collected ground-reaction force data including the eccentric rate of force development (“load”), concentric vertical force (“explode”), and concentric vertical impulse (“drive”) as well as the Sparta Score. The advanced statistical metrics from each baseball season (eg, fielding independent pitching [FIP], weighted stolen base runs [wSB] , and weighted on-base average) were also gathered for the study participants. The minimal detectable change (MDC) was calculated for each CMJ variable to establish normative parameters. Pearson coefficient analysis and regression trees were used to evaluate associations between CMJ data and advanced statistical metrics for the players. Results: A total of 151 pitchers and 138 batters were included in the final analysis. The MDC for “load,” “explode,” “drive,” and the Sparta Score was 10.3, 8.1, 8.7, and 4.6, respectively, and all demonstrated good reliability (intraclass correlation coefficient 〉 0.75). There was a weak but statistically significant correlation between the Sparta Score and wSB ( r = 0.23; P = .007); however, there were no significant correlations with any other advanced metrics. Regression trees demonstrated superior FIP with higher Sparta Scores in older pitchers compared with younger pitchers. Conclusion: There was a positive but weak correlation between the Sparta Score and base-stealing performance among professional baseball players. Additionally, older pitchers with a higher Sparta Score had statistically superior FIP compared with younger pitchers with a similar Sparta Score after adjusting for age.
    Type of Medium: Online Resource
    ISSN: 2325-9671 , 2325-9671
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2021
    detail.hit.zdb_id: 2706251-X
    SSG: 31
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 8
    Online Resource
    Online Resource
    SAGE Publications ; 2016
    In:  Emerging Adulthood Vol. 4, No. 4 ( 2016-08), p. 272-283
    In: Emerging Adulthood, SAGE Publications, Vol. 4, No. 4 ( 2016-08), p. 272-283
    Abstract: Alcohol use is associated with impaired decision making and unwanted sexual outcomes, but emerging adults generally perceive the co-occurrence of alcohol use and sexual behavior positively. The current study examined perceived links between alcohol use and sexual experiences. Data were from 279 college students using stratified random sampling with replacement (56% female, 25% Hispanic/Latino, 22% African American, 28% Asian American/Pacific Islander, and 51% European American; M = 19.95 [0.43] years old). We coded participants’ responses to an open-ended question about how their alcohol use and sexual feelings were related. Students generally perceived that alcohol is facilitative of sex or has no effect. The most common responses were that alcohol leads to arousal and disinhibition. Almost no students mentioned alcohol’s impact on contraceptive use or sexual assault. Results differed by gender, prior sexual behavior, and heavy drinking. We interpret results in light of alcohol myopia theory and discuss implications for prevention.
    Type of Medium: Online Resource
    ISSN: 2167-6968 , 2167-6984
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2016
    detail.hit.zdb_id: 2706250-8
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 9
    Online Resource
    Online Resource
    SAGE Publications ; 2018
    In:  Orthopaedic Journal of Sports Medicine Vol. 6, No. 7_suppl4 ( 2018-07-01), p. 2325967118S0017-
    In: Orthopaedic Journal of Sports Medicine, SAGE Publications, Vol. 6, No. 7_suppl4 ( 2018-07-01), p. 2325967118S0017-
    Abstract: Suture anchors are commonly utilized during arthroscopic rotator cuff repair (RCR). Recently, all-suture suture-anchor (ASSA) constructs have been introduced for RCR; however, the biomechanical properties of these implants are poorly understood. The purpose of this study was to compare the biomechanical properties of ASSA to conventional suture anchor (CSA) fixation during RCR. Methods: Fourteen fresh-frozen matched pair human cadaveric shoulders (average age 52 ± 13 years) with no documented prior rotator cuff tears or shoulder surgery were dissected. The supraspinatous tendon was isolated and detached from its footprint, and then was repaired in an anatomical position. Specimens were randomized into two repair constructs: Q-FIX double-loaded ASSA (N=7) and TWINFIX double-loaded conventional suture anchor (CSA) (N=7) (Smith & Nephew, Andover, MA). Each construct was cyclically loaded from 10 to 160 N for 100 cycles at 100N/s, and then pulled to failure at 1mm/s starting from the zero position. Load, crosshead displacement, failure mode, and time were recorded. Correlations between BMD, tendon gage length, maximum load, and stiffness were assessed. The groups were statistically analyzed with independent samples t-test, Fisher’s exact test, and a linear regression analysis, with p 〈 0.05 considered significant. Results: There was no statistically significant difference in maximum load (ASSA: 617.73±177.8, CSA: 545.13±212.98 N, p=0.339), cyclic extension (ASSA: 7.88±1.33, CSA: 8.49±2.14 mm, p=0.117), construct stiffness (ASSA: 62.43±11.06, CSA: 68.14±10.77 N/mm, p=0.973), or extension at maximum load (ASSA: 17.03±4.73, CSA: 15.45±1.73 mm, p=0.122) between the ASSA and CSA groups. Failure modes consisted of suture tearing out of the tendon (ASSA: N=3, CSA: N=3) and anchor pull out (ASSA: N=4, CSA: N=4), with no difference in failure mode between groups (p=0.99). An association trended towards significance between higher BMD and higher maximum load in the CSA group (p=0.053) but not the ASSA group (p=0.125) Conclusion: ASSA constructs for RCR have similar biomechanical properties compared to CSA constructs. Additional clinical data is necessary to determine if these biomechanical results can be translated clinically.
    Type of Medium: Online Resource
    ISSN: 2325-9671 , 2325-9671
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2018
    detail.hit.zdb_id: 2706251-X
    SSG: 31
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 10
    Online Resource
    Online Resource
    SAGE Publications ; 1990
    In:  Evaluation News Vol. 11, No. 2 ( 1990-6), p. 140-141
    In: Evaluation News, SAGE Publications, Vol. 11, No. 2 ( 1990-6), p. 140-141
    Type of Medium: Online Resource
    ISSN: 0191-8036
    Language: Unknown
    Publisher: SAGE Publications
    Publication Date: 1990
    detail.hit.zdb_id: 2020738-4
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...