The gluteus maximus is the largest muscle in the body and is the primary hip extensor
muscle for the drive phase of acceleration (hip extension).
The basic anatomical cause is sudden and often repeated use of the forearm extensor
muscles, which previously had not been much used.
For the back extensors
and latissimus dorsi the average was approximately 1200 work units.
They hypothesized that as the head falls forward, the neck extensors
progressively stretch and are thus unable to generate adequate tension during contraction.
The forward head position will cause the back extensors
to work harder in order to counteract the displacement of the center of gravity.
Lie face down, flat on the floor with your arms straight by your sides.
These periods of high torque and power absorption occur when the knee is flexing; thus, a large, eccentric contraction of knee extensors
is required to prevent leg buckling.
This was then followed by five maximal concentric efforts of the knee extensors
Lower extremity muscle strength was: hip flexors 3-/5 at right and 4-/5 at left, hip extensors
4/5 at right and 4+/5 at left, hip abductors 4-/5 at right and 4/5 at left, knee flexors and extensors
bilaterally 3/5, and muscle strength of dorsiflexors and plantarflexors of foot as well as extensor
hallucis longus (EHL) strength bilaterally was 0/5.
Soft-tissue mobilization and strengthening exercises focused on the hip extensors
, knee flexors and extensors
, and ankle plantarflexors.
Maximum isometric knee extensors
and elbow flexors strength was assessed during the one-hour exercise class as a "station" in the circuit training offered as part of the programme.
If you want to bring about physiological change to help the development and endurance of back muscles, you must focus your training on those specific muscles and not other muscular groups such as hip extensors
," says Christian Larivihre, a professor at the Institut de recherche Robert-Sauvi en santi et en sicuriti du travail (IRSST), who conducted the study with Universiti de Montrial researchers Bertrand Arsenault, Rubens A.
Studies on gender differences in back extensors
muscles endurance has been inconsistent and inconclusive.
A classic example of an injury-inducing strength imbalance is the study done of strong knee flexors in relation to the far weaker knee extensors
in collegiate women with ACL injuries.
Does 2 weeks of a novel weight-bearing strengthening program enable older people undergoing inpatient rehabilitation to stand up from a lower chair and result in stronger knee extensors
than a traditional non-weight-bearing strengthening program?