In a placebo controlled double - blind study of frail elderly patients, treatment with NAC doubled the increase in
knee extensor strength during a 6 - week program of physical exercise and slowed the subsequent decline during a 6 - week follow - up period.
The results were a little unclear because the changes were very small after such a light training program — but the increases in MMSE score were indeed correlated (with p < 0.05) with increases in
knee extensor strength.
Not exact matches
In a nutshell, the anatomic traits that are associated with a more upright squatting posture include: greater heel elevation, greater ankle dorsiflexion mobility, shorter femur length, longer torso length, wider stance width, more abduction, a higher bar position on the back, greater quadriceps
strength and increased intent to target the
knee extensors.
Sure enough, the more highly supervised athletes gained significantly more
strength in bench press and
knee extensor exercises.
Unlike sprinting, this eccentric
strength is likely necessary for the hip
extensors and
knee extensors, as the COD maneuver usually involves combined hip flexion and
knee flexion.
Since
strength is specific, then:
strength training that focuses on the
knee (and hip)
extensors should lead to superior gains in COD ability than
strength training that is more generally applied to the whole lower body.
Since
strength is specific, then:
strength training for the hip
extensors and
knee extensors with eccentric - only muscle actions or accentuated eccentric loading should lead to superior gains in COD ability compared to conventional
strength training.
Test of transfer (long - term):
strength training emphasizing the hip
extensors more than the
knee extensors (e.g. jump squat vs. push press or hip thrust vs. front squat) does lead to greater gains in sprinting performance compared to exercises that stress the
knee extensors more than the hip
extensors (Loturco et al. 2016; Contreras et al. 2016), and a hamstring - focused strengthening program is additive for sprinting when included alongside normal training (Mendiguchia et al. 2015).
Specific
strength requirement:
knee flexor (and possibly also
knee extensor) eccentric
strength; hip flexor and hip
extensor concentric
strength.
Test of transfer (long - term):
Strength training that targets the hip extensors close to full extension (such as with the hip thrust), and the knee extensors at around 40 degrees from full extension (such as with the quarter squat), may well transfer better to sprinting than strength training that targets the hip and knee extensors at other joint
Strength training that targets the hip
extensors close to full extension (such as with the hip thrust), and the
knee extensors at around 40 degrees from full extension (such as with the quarter squat), may well transfer better to sprinting than
strength training that targets the hip and knee extensors at other joint
strength training that targets the hip and
knee extensors at other joint angles.
Specific
strength requirement: hip
extensor and
knee flexor (hamstrings) and hip flexor (psoas major and rectus femoris)
strength.