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  • 1
    Online Resource
    Online Resource
    Comparison of the Hang High Pull and Loaded Jump Squat for the Development of Vertical Jump and Isometric Force-Time Characteristics
    Ovid Technologies (Wolters Kluwer Health) ; 2019
    In:  Journal of Strength and Conditioning Research Vol. 33, No. 1 ( 2019-01), p. 17-24
    Details
    In: Journal of Strength and Conditioning Research, Ovid Technologies (Wolters Kluwer Health), Vol. 33, No. 1 ( 2019-01), p. 17-24
    Abstract: Oranchuk, DJ, Robinson, TL, Switaj, ZJ, and Drinkwater, EJ. Comparison of the hang high pull and loaded jump squat for the development of vertical jump and isometric force-time characteristics. J Strength Cond Res 33(1): 17–24, 2019—Weightlifting movements have high skill demands and require expert coaching. Loaded jumps have a comparably lower skill demand but may be similarly effective for improving explosive performance. The purpose of this study was to compare vertical jump performance, isometric force, and rate of force development (RFD) after a 10-week intervention using the hang high pull (hang-pull) or trap-bar jump squat (jump-squat). Eighteen National Collegiate Athletic Association Division II swimmers (8 males, 10 females) with at least 1 year of resistance training experience volunteered to participate. Testing included the squat jump (SJ), countermovement jump, and the isometric midthigh pull (IMTP). Vertical ground reaction forces were analyzed to obtain jump height and relative peak power. Relative peak force, peak RFD, and relative force at 5 time bands were obtained from the IMTP. Subjects were randomly assigned to either a hang pull ( n = 9) or jump-squat ( n = 9) training group and completed a 10-week, volume-equated, periodized training program. Although there was a significant main effect of training for both groups, no statistically significant between-group differences were found ( p ≥ 0.17) for any of the dependent variables. However, medium effect sizes in favor of the jump-squat training group were seen in SJ height ( d = 0.56) and SJ peak power ( d = 0.69). Loaded jumps seem equally effective as weightlifting derivatives for improving lower-body power in experienced athletes. Because loaded jumps require less skill and less coaching expertise than weightlifting, loaded jumps should be considered where coaching complex movements is difficult.
    Type of Medium: Online Resource
    ISSN: 1064-8011
    URL: Article
    DOI: 10.1519/JSC.0000000000001941
    Language: English
    Publisher: Ovid Technologies (Wolters Kluwer Health)
    Publication Date: 2019
    detail.hit.zdb_id: 2142889-X
    SSG: 31
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  • 2
    Online Resource
    Online Resource
    Improved power clean performance with the hook-grip is not due to altered force-time or horizontal bar-path characteristics
    Informa UK Limited ; 2022
    In:  Journal of Sports Sciences Vol. 40, No. 2 ( 2022-01-17), p. 226-235
    Details
    In: Journal of Sports Sciences, Informa UK Limited, Vol. 40, No. 2 ( 2022-01-17), p. 226-235
    Type of Medium: Online Resource
    ISSN: 0264-0414 , 1466-447X
    URL: Article
    DOI: 10.1080/02640414.2021.1986270
    Language: English
    Publisher: Informa UK Limited
    Publication Date: 2022
    detail.hit.zdb_id: 2001639-6
    SSG: 31
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  • 3
    Online Resource
    Online Resource
    An Accessible, 16-Week Neck Strength Training Program Improves Head Kinematics Following Chest Perturbation in Young Soccer Athletes
    Human Kinetics ; 2021
    In:  Journal of Sport Rehabilitation Vol. 30, No. 8 ( 2021-11-1), p. 1158-1165
    Details
    In: Journal of Sport Rehabilitation, Human Kinetics, Vol. 30, No. 8 ( 2021-11-1), p. 1158-1165
    Abstract: Context : Neck size and strength may be associated with head kinematics and concussion risks. However, there is a paucity of research examining neck strengthening and head kinematics in youths. In addition, neck training is likely lacking in youth sport due to a perceived inadequacy of equipment or time. Objective : Examine neck training effects with minimal equipment on neck strength and head kinematics following chest perturbations in youth athletes. Design : Single-group, pretest–posttest case series. Setting : Athlete training center. Participants : Twenty-five (14 men and 11 women) youth soccer athletes (9.8 [1.5] y). Intervention : Sixteen weeks of twice-weekly neck-focused resistance training utilizing bands, body weight, and manual resistance. Main Outcome Measures : Head kinematics (angular range of motion, peak anterior–posterior linear acceleration, and peak resultant linear acceleration) were measured by an inertial motion unit fixed to the apex of the head during torso perturbations. Neck-flexion and extension strength were assessed using weights placed on the forehead and a plate-loaded neck harness, respectively. Neck length and circumference were measured via measuring tape. Results : Neck extension (increase in median values for all: +4.5 kg, +100%, P   〈  .001; females: +4.5 kg, +100%, P  = .002; males: +2.2 kg, +36%, P  = .003) and flexion (all: +3.6 kg, +114%, P   〈  .001; females: +3.6 kg, +114%, P  = .004; males: +3.6 kg, +114%, P  = .001) strength increased following the intervention. Men and women both experienced reduced perturbation-induced head pitch (all: −84%, P   〈  .001). However, peak resultant linear acceleration decreased in the female (−53%, P  = .004), but not male (−31%, P  = 1.0) subgroup. Preintervention peak resultant linear acceleration and extension strength ( R 2  = .21, P  = .033) were the closest-to-significance associations between head kinematics and strength. Conclusions : Young athletes can improve neck strength and reduce perturbation-induced head kinematics following a 16-week neck strengthening program. However, further research is needed to determine the effect of improved strength and head stabilization on concussion injury rates.
    Type of Medium: Online Resource
    ISSN: 1056-6716 , 1543-3072
    URL: Article
    DOI: 10.1123/jsr.2020-0537
    Language: Unknown
    Publisher: Human Kinetics
    Publication Date: 2021
    SSG: 31
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  • 4
    Online Resource
    Online Resource
    Kinetic and Kinematic Effects of Asymmetrical Loading of the Lower Limb During High-Speed Running
    Human Kinetics ; 2022
    In:  Journal of Sport Rehabilitation Vol. 31, No. 3 ( 2022-03-1), p. 313-318
    Details
    In: Journal of Sport Rehabilitation, Human Kinetics, Vol. 31, No. 3 ( 2022-03-1), p. 313-318
    Abstract: Context : Light lower-limb wearable resistance has little effect on running biomechanics. However, asymmetrical wearable resistance may potentially alter the kinetics and kinematics of high speed, enabling greater loading or unloading of an injured or rehabilitative lower limb. Design : A cross-sectional study design was used to quantify the influence of asymmetric calf loading on the kinematics and kinetics during 90% maximum sprinting velocity. Methods : Following a familiarization session, 12 (male = 7 and female = 5) physically active volunteers ran at 90% of maximal velocity. In random order, participants ran with zero (0) wearable resistance and with loads of 300 g (L300) and 600 g (L600) fixed to one shank. A nonmotorized treadmill quantified vertical and horizontal kinetics and step kinematics. The kinetics and kinematics of the loaded (L0, L300, and L600) and unloaded (UL; UL0, UL300, and UL600) limbs were compared. Results : Vertical step ground reaction force of the loaded limb tended to increase between unloaded and 300 and 600 conditions (effect size [ES] = 0.48 to 0.76, all P  ≤ .12), while the horizontal step force of the UL tended to decrease (ES = 0.54 to 1.32, all P  ≤ .09) with greater external loading. Step length increased in the UL in 0 versus 300 and 600 conditions (ES = 0.60 to 0.70, all P  ≤ .06). Step frequency decreased in the ULs in unloaded versus 300 and 600 conditions (ES = 0.73 to 1.10, all P  ≤ .03). Mean step velocity tended to be greater in the ULs than the 300 and 600 conditions (ES = 0.52 to 1.01, all P  ≤ .10). Only 4 of 16 variables were significantly different between the 300 and 600 conditions. Conclusions : Asymmetrical shank resistance could be used during high-speed running to reduce or increase the kinetic loading of an injured/rehabilitative limb during return to play protocols. Asymmetrical wearable resistance could also be used to alter step kinematics in runners with known asymmetries. Finally, meaningful alterations in high-speed running biomechanics can be achieved with only 300 g of shank loading.
    Type of Medium: Online Resource
    ISSN: 1056-6716 , 1543-3072
    URL: Article
    DOI: 10.1123/jsr.2021-0131
    Language: Unknown
    Publisher: Human Kinetics
    Publication Date: 2022
    SSG: 31
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  • 5
    Online Resource
    Online Resource
    Mechanisms of neuromuscular fatigue and recovery in unilateral versus bilateral maximal voluntary contractions
    American Physiological Society ; 2020
    In:  Journal of Applied Physiology Vol. 128, No. 4 ( 2020-04-01), p. 785-794
    Details
    In: Journal of Applied Physiology, American Physiological Society, Vol. 128, No. 4 ( 2020-04-01), p. 785-794
    Abstract: The aim of this study was to investigate differences in neuromuscular function and corticospinal excitability in response to sustained unilateral (UNIL) and bilateral (BIL) isometric maximal voluntary contraction (IMVC) of the knee extensors. Eleven men performed a 1-min sustained IMVC of the knee extensors with one or both legs. Central and peripheral measures of neuromuscular function and corticospinal excitability were assessed via surface electromyography (EMG), peripheral nerve stimulation, and transcranial magnetic stimulation before, immediately after, and during recovery from IMVC. IMVC force and root-mean-squared EMG decreased during the fatiguing 1-min IMVC, with a larger decrease in EMG during BIL. All neuromuscular function indexes decreased significantly after the IMVC ( P 〈 0.005), but the magnitude of these decreases did not differ between conditions. Changes in corticospinal excitability (motor evoked potential) and inhibition (silent period) did not differ between conditions. In contrast to previous studies utilizing submaximal exercise, no more peripheral fatigue was found after UNIL vs. BIL conditions, even though central drive was lower after BIL 1-min IMVC. Corticospinal excitability and inhibition were not found to be different between UNIL and BIL conditions, in line with maximal voluntary activation. NEW & NOTEWORTHY The present experiment used peripheral nerve stimulation and transcranial magnetic stimulations during a sustained isometric maximal voluntary contraction to investigate the influence of muscle mass on neuromuscular fatigue. Contrary to previous studies that used submaximal exercise, peripheral fatigue was not found to be greater in unilateral vs. bilateral knee extensions even though central drive was lower during bilateral contractions. Corticospinal excitability and inhibition were not found to be different between unilateral and bilateral conditions.
    Type of Medium: Online Resource
    ISSN: 8750-7587 , 1522-1601
    URL: Article
    DOI: 10.1152/japplphysiol.00651.2019
    RVK:
    WA 15000
    RVK:
    XA 52094
    Language: English
    Publisher: American Physiological Society
    Publication Date: 2020
    detail.hit.zdb_id: 1404365-8
    SSG: 12
    SSG: 31
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  • 6
    Online Resource
    Online Resource
    Superficial heat administration and foam rolling increase hamstring flexibility acutely; with amplifying effects
    Elsevier BV ; 2019
    In:  Physical Therapy in Sport Vol. 40 ( 2019-11), p. 213-217
    Details
    In: Physical Therapy in Sport, Elsevier BV, Vol. 40 ( 2019-11), p. 213-217
    Type of Medium: Online Resource
    ISSN: 1466-853X
    URL: Article
    DOI: 10.1016/j.ptsp.2019.10.004
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2019
    detail.hit.zdb_id: 2007802-X
    SSG: 31
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  • 7
    Online Resource
    Online Resource
    Eight Weeks of Strength and Power Training Improves Club Head Speed in Collegiate Golfers
    Ovid Technologies (Wolters Kluwer Health) ; 2020
    In:  Journal of Strength and Conditioning Research Vol. 34, No. 8 ( 2020-08), p. 2205-2213
    Details
    In: Journal of Strength and Conditioning Research, Ovid Technologies (Wolters Kluwer Health), Vol. 34, No. 8 ( 2020-08), p. 2205-2213
    Abstract: Oranchuk, DJ, Mannerberg, JM, Robinson, TL, and Nelson, MC. Eight weeks of strength and power training improves club head speed in collegiate golfers. J Strength Cond Res 34(8): 2205–2213, 2020—Club head speed (CHS) is a major determinant of drive distance, a key component of golf performance. The purpose of this study was to determine the indirect effects of an 8-week strength and power program on CHS. Twelve (6 men, 6 women) NCAA Division II golfers (20.3 ± 1.5 years) randomly assigned to an intervention or control group underwent either a periodized strength and power program consisting of high-load barbell movements or a bodyweight and rotational movement focused resistance training program. Outcomes were CHS, countermovement jump (CMJ) height, and 1RM back squat (BS), power clean (PC), and deadlift (DL). Dependent t -tests were used to assess differences in outcome variables pre-to-post for each group, independent t -tests were used to assess differences between groups, and Pearson correlations were used to assess associations between CHS and outcome variables. On average, the intervention group experienced improvements in all outcome variables except peak CHS ( p = 0.60); the control group displayed no changes in any outcome variable except a decrease in average CHS ( p = 0.028). Compared with the control group, the intervention group experienced greater improvements in average CHS, BS, PC, and average and peak CMJ height ( p ≤ 0.05). Additionally, CHS had large associations with PC ( r = 0.70, p = 0.012), BS ( r = 0.64, p = 0.025), DL ( r = 0.54, p = 0.068) and CMJ ( r = 0.73, p = 0.007). These results suggest that improving muscular strength and power by increasing PC, BS, and CMJ is associated with increased CHS in collegiate golfers. Integrating a high-load, barbell-focused strength and power program may be beneficial for improving CHS and indirectly, golf performance.
    Type of Medium: Online Resource
    ISSN: 1064-8011
    URL: Article
    DOI: 10.1519/JSC.0000000000002505
    Language: English
    Publisher: Ovid Technologies (Wolters Kluwer Health)
    Publication Date: 2020
    detail.hit.zdb_id: 2142889-X
    SSG: 31
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  • 8
    Online Resource
    Online Resource
    Variability of regional quadriceps echo intensity in active young men with and without subcutaneous fat correction
    Canadian Science Publishing ; 2020
    In:  Applied Physiology, Nutrition, and Metabolism Vol. 45, No. 7 ( 2020-07), p. 745-752
    Details
    In: Applied Physiology, Nutrition, and Metabolism, Canadian Science Publishing, Vol. 45, No. 7 ( 2020-07), p. 745-752
    Abstract: Quantifying echo intensity (EI), a proposed measure of muscle quality, is becoming increasingly popular. Additionally, much attention has been paid to regional differences in other ultrasonically evaluated measures of muscle morphology and architecture. However, the variability of regional (proximal, middle, distal) EI of the vastus lateralis, rectus femoris, and lateral and anterior vastus intermedius has yet to be determined. Twenty participants (40 limbs), were evaluated on 3 occasions, separated by 7 days. Intersession variability of EI with and without subcutaneous fat correction was quantified. Furthermore, the interchangeability of corrected EI across regions was evaluated. Variability of regional quadriceps EI was substantially lower with subcutaneous fat correction (intraclass correlation coefficient (ICC) = 0.81–0.98, coefficient of variation (CV) = 4.5%–16.8%, typical error of measure (TEM) = 0.13–0.49) versus raw values (ICC = 0.69–0.98, CV = 7.7%–42.7%, TEM = 0.14–0.68), especially when examining the vastus intermedius (ICC = 0.81–0.95, CV = 7.1%–16.8%, TEM = 0.23–0.49 vs. ICC = 0.69–0.92, CV = 22.9%–42.7%, TEM = 0.31–0.68). With the exception of the rectus femoris and vastus intermedius (p ≥ 0.143, effect size (ES) ≤ 0.18), corrected EI was greater for proximal and distal regions when compared with the midpoint (p ≤ 0.038, ES = 0.38–0.82). Researchers and practitioners should utilize subcutaneous fat thickness correction to confidently evaluate EI at all regions of the quadriceps. Regional EI cannot be used interchangeably for the vastus muscles, likely because of an increase in fibrous content towards the myotendinous junctions. Novelty Regional quadriceps echo intensity was reliable with and without correction for subcutaneous fat thickness. Intersession variability of regional quadriceps echo intensity was substantially improved following subcutaneous fat correction. Quadriceps echo intensity increased towards myotendinous junctions in the vastus muscles.
    Type of Medium: Online Resource
    ISSN: 1715-5312 , 1715-5320
    URL: Article
    DOI: 10.1139/apnm-2019-0601
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 2020
    SSG: 31
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  • 9
    Online Resource
    Online Resource
    Short-term neuromuscular, morphological, and architectural responses to eccentric quasi-isometric muscle actions
    Springer Science and Business Media LLC ; 2021
    In:  European Journal of Applied Physiology Vol. 121, No. 1 ( 2021-01), p. 141-158
    Details
    In: European Journal of Applied Physiology, Springer Science and Business Media LLC, Vol. 121, No. 1 ( 2021-01), p. 141-158
    Type of Medium: Online Resource
    ISSN: 1439-6319 , 1439-6327
    URL: Article
    DOI: 10.1007/s00421-020-04512-4
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2021
    detail.hit.zdb_id: 1459054-2
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  • 10
    Online Resource
    Online Resource
    Kinetic and kinematic profile of eccentric quasi-isometric loading
    Informa UK Limited ; 2021
    In:  Sports Biomechanics
    Details
    In: Sports Biomechanics, Informa UK Limited
    Type of Medium: Online Resource
    ISSN: 1476-3141 , 1752-6116
    URL: Article
    DOI: 10.1080/14763141.2021.1890198
    Language: English
    Publisher: Informa UK Limited
    Publication Date: 2021
    detail.hit.zdb_id: 2098824-2
    SSG: 31
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