Impaired Knee Muscle Capacity Is Correlated With Impaired Sagittal Kinematics During Jump Landing in Women With Patellofemoral Pain

Abstract

Nunes, GS, Barton, CJ, and Serra ˜o, FV. Impaired knee muscle capacity is correlated with impaired sagittal kinematics during jump landing in women with patellofemoral pain. J Strength Cond Res 36(5): 1264-1270, 2022-Knee and hip muscle capacity is impaired in women with patellofemoral pain (PFP), but little is known about the rate of force development (RFD) at the knee. Impaired muscle capacity may contribute to reduced sagittal plane movement at the knee and hip during jump landing in women with PFP. This study aimed to (a) compare knee extensor muscle capacity (including RFD), and hip abductor and extensor muscle capacity between women with and without PFP; and (b) evaluate the relationship between hip/knee muscle capacity and sagittal kinematics during single-legged drop jump landing in women with PFP. Fifty-two physically active women (26 with PFP and 26 controls) participated. Rate of force development (in %/ms), isometric, concentric, and eccentric torque (in N•m•kg 21 3 100) were evaluated using isokinetic dynamometry, and knee and hip kinematics were evaluated using three-dimensional motion capture. Compared with the control group (CG), the PFP group (PFPG) presented lower isometric (12%,

Adding Muscle Power Exercises To A Strength Training Program For People With Patellofemoral Pain: Protocol Of A Randomized Controlled Trial

“…Moreover, people with PFP present other proximal and knee muscle capacity de cits, such as rate of force development (RFD) and power [12][13][14][15]. Nunes et al [12,13] reported lower hip abductor and extensor, and knee extensor rate of force development (RFD) during maximal isometric contraction in women with PFP compared to women without PFP. Similarly, according to the study by Ferreira et al [15], women with PFP have lower hip abductor and knee extensor RFD during isometric, concentric and eccentric contractions compared to women without PFP.…”

“…Although these recent studies have shown that patients with PFP have hip and knee muscle power de cits [12][13][14][15], little is known in relation to power training effects in these people. Until the moment, only two studies included power exercises for the treatment of these patients [30,33].…”

“…-Knee extensors: the participants will be placed in a sitting position with hips at 85 degrees of exion and neutral position for transversal and frontal planes, and the knee of the assessed limb at 60 degrees of exion [13]. The resistance pad will be xed with a velcro strip just above the lateral malleolus and the rotation axis of the dynamometer will be aligned with the lateral femoral epicondyle.…”

“…Previous studies reported that people with PFP have decreased strength in hip [8,9] and knee muscles [10,11]. Additionally, other parameters of hip and knee muscle capacity seem to be altered in people with PFP, such as rate of force development (RFD) and power [12][13][14][15]. Therefore, exercise therapy addressing these de cits may be important for PFP rehabilitation.…”

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“…There will be a 4 min rest period between each test at two different speeds 51. Participants will be urged to exert themselves to the fullest during the test,52 and the results, recorded in Newton-metres, Newton-metres/kg and watts, will be calculated as the peak torque, peak torque per kilogram of body weight and power. Research has shown that the reliability of knee muscle strength assessment using the isokinetic method is 0.94 in test–retest scenarios 53.…”