Effect of short-duration spaceflight on thigh and leg muscle volume

Article Abstract:

Muscle atrophy due to a minimum of 2 weeks of space flight has been shown to vary between individuals and muscle groups. The degree of atrophy for this period is greater than that caused by 20 days of bed rest.

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Muscle function in 164 men and women aged 20-84 years

Article Abstract:

This article examines the effects of aging on the functional properties of skeletal muscles in men and women. Findings indicate that an age-related decline in muscle strength is associated with a deterioration of muscle mass in both genders, but may also be related to neural factors in men.

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Early phase adaptations of muscle use and strength to isokinetic training

Article Abstract:

Isokinetic resistance training may strengthen muscles without adding bulk. Researchers measured adaptations in the right quadriceps femoris muscles of seven men who performed 50 isokinetic knee extensions per day for 13 days. Muscle fiber types, fiber area, and phosphofruktokinase activities, taken from the vastus lateralis, showed no difference aafter training. Peak torques and relative areas of the quadriceps femoris increased, however. Magnetic resonance imaging showed increased muscle contraction in both the superficial and deep muscle areas.

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