Pivot task increases knee frontal plane loading compared with sidestep and drop-jump

Cortés, Nelson; Oñate, James A.; Lunen, Bonnie Van

doi:10.1080/02640414.2010.523087

Cited by 56 publications

(69 citation statements)

References 35 publications

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“…2,6 We noted that the demands placed upon the lower limb have been shown to be task dependent. 23 Hence, comparing our results of fatigue using a sidestep task with the results of other researchers who used distinctly different tasks could yield contradictory findings. Our results were partially analogous to those reported by researchers 21 investigating a sidestep task.…”

Section: Discussioncontrasting

confidence: 45%

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Changes in Lower Extremity Biomechanics Due to a Short-Term Fatigue Protocol

Cortés

Greska

Kollock

et al. 2013

Journal of Athletic Training

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Context: Noncontact anterior cruciate ligament injury has been reported to occur during the later stages of a game when fatigue is most likely present. Few researchers have focused on progressive changes in lower extremity biomechanics that occur throughout fatiguing.Objective: To evaluate the effects of a sequential fatigue protocol on lower extremity biomechanics during a sidestepcutting task (SS).Design: Controlled laboratory study. Setting: Laboratory.Patients or Other Participants: Eighteen uninjured female collegiate soccer players (age ¼ 19.2 6 0.9 years, height ¼ 1.66 6 0.5 m, mass ¼ 61.6 6 5.1 kg) volunteered.Intervention(s): The independent variable was fatigue level, with 3 levels (prefatigue, 50% fatigue, and 100% fatigue). Using 3-dimensional motion capture, we assessed lower extremity biomechanics during the SS. Participants alternated between a fatigue protocol that solicited different muscle groups and mimicked actual sport situations and unanticipated SS trials. The process was repeated until fatigue was attained.Main Outcome Measure(s): Dependent variables were hipand knee-flexion and abduction angles and internal moments measured at initial contact and peak stance and defined as measures obtained between 0% and 50% of stance phase.Results: Knee-flexion angle decreased from prefatigue (À178 6 58) to 50% fatigue (À168 6 68) and to 100% fatigue (À148 6 48) (F 2,34 ¼ 5.112, P ¼ .004). Knee flexion at peak stance increased from prefatigue (À52.98 6 5.68) to 50% fatigue (À56.18 6 7.28) but decreased from 50% to 100% fatigue (À50.58 6 7.18) (F 2,34 ¼ 8.282, P ¼ 001). Knee-adduction moment at peak stance increased from prefatigue (0.49 6 0.23 Nm/kgm) to 50% fatigue (0.55 6 0.25 Nm/kgm) but decreased from 50% to 100% fatigue (0.37 6 0.24) (F 2,34 ¼ 3.755, P ¼ 03). Hip-flexion angle increased from prefatigue (45.48 6 10.98) to 50% fatigue (46.28 6 11.28) but decreased from 50% to 100% fatigue (40.98 6 11.38) (F 2,34 ¼ 6.542, P ¼ .004). Hip flexion at peak stance increased from prefatigue (49.88 6 9.98) to 50% fatigue (52.98 6 12.18) but decreased from 50% to 100% fatigue (46.38 6 12.98) (F 2,34 ¼ 8.639, P ¼ 001). Hip-abduction angle at initial contact decreased from prefatigue (À13.88 6 6.68) to 50% fatigue (À9.18 6 6.58) and to 100% fatigue (À7.88 6 6.58) (F 2,34 ¼ 11.228, P , .001). Hip-adduction moment decreased from prefatigue (0.14 6 0.13 Nm/kgm) to 50% fatigue (0.08 6 0.13 Nm/kgm) and to 100% fatigue (0.06 6 0.05 Nm/kg) (F 2,34 ¼ 5.767, P ¼ .007).Conclusions: The detrimental effects of fatigue on sagittal and frontal mechanics of the hip and knee were visible at 50% of the participants' maximal fatigue and became more marked at 100% fatigue. Anterior cruciate ligament injury-prevention programs should emphasize feedback on proper mechanics throughout an entire practice and not only at the beginning of practice.Key Words: anterior cruciate ligament, knee, fatiguing, kinematics, kinetics Key PointsA progressive change in lower extremity mechanics occurred for knee-flexion angle, hip-abduction angle,...

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Section: Discussioncontrasting

confidence: 45%

“…23 The dominant foot was defined as the foot a participant would use to kick a ball the farthest. Before data collection, participants practiced the task 3 times or until they were comfortable with it (average ¼ 4 practice trials).…”

Section: Methodsmentioning

confidence: 99%

Changes in Lower Extremity Biomechanics Due to a Short-Term Fatigue Protocol

Cortés

Greska

Kollock

et al. 2013

Journal of Athletic Training

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“…This data refutes the preconceived notion that superior performance from one change of direction task transfers to another and supports the concept that the biomechanical demands of change of direction are angle dependant and as such are independent skills. [33][34][35] Significant mean differences were observed between D and ND CODS, with greater imbalances observed between cutting directions compared to mod505 directions ( Table 1). Irrespective of direction, theoretically the time taken to enter the change of direction should be similar between directions thus, the imbalance and deficit in completion time suggests there is a movement deficiency in changing direction to the ND side.…”

Section: Discussionmentioning

confidence: 99%

Asymmetries in single and triple hop are not detrimental to change of direction speed

Dos’Santos¹,

Thomas²,

Jones³

et al. 2017

Journal of Trainology

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Objectives:To determine the impact of between limb asymmetries in hop performance on change of direction speed (CODS). Design and Methods: Twenty-two multisport collegiate athletes (mean ± SD; age: 21.8 ± 3.4 years, height: 178.1 ± 6.7 cm, mass:73.5 ± 7.1kg) performed three single and triple horizontal hops for distance per limb, followed by three modified 505 and 90˚cut CODS trials each side to establish imbalances between right and left, and dominant (D) and non-dominant (ND) limbs. Limb dominance was defined as the limb that produced the furthest hop or faster CODS performance.Results: Paired sample t-tests revealed no significant differences in hop performance and CODS performance between right and left limbs (p > 0.05, g ≤ 0.11), however, significant differences were observed when comparing D and ND limbs (p < 0.001, g = 0.46-0.61). No significant correlations were observed between hop imbalance and CODS performance (p > 0.05, r ≤ 0.35). Low agreements (32-55%) were demonstrated between like for like identifications of asymmetry for CODS and hop performance. Conclusions:Imbalances in hop and CODS were present; however, greater hop imbalances were not detrimental to CODS.Furthermore, the D limb for hopping did not necessarily correspond to faster performance from that limb during 180˚ turns and 90˚ cuts (plant foot). Collegiate male multi-sport athletes with imbalances within the range reported within this study (≤ 15%) should not experience associated CODS detriments.(Journal of Trainology 2017;6:35-41)

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“…3,4,14,15 In sidestep cutting the athletes had lower 169 knee flexion angles and higher knee valgus and internal rotation angles at IC and at maximum. The 170 knee joint moments were higher in all three planes for the sidestepping movement.…”

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confidence: 99%

“…The main 74 differences found between drop jumps and sidestep cutting are lower knee flexion angles and higher 75 knee valgus angles and knee abduction moments in sidestep cutting. 3,4,14 One study has done a 76 factor analysis of drop jumps and sidestep cutting. 15 They found poor correlation between frontal 77 plane measures in drop jumps and unanticipated cutting.…”

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confidence: 99%