Effects of resistive and balance exercises on isokinetic strength in older persons.
OBJECTIVE
To determine the safety and efficacy of 3 months of resistive training of multiple lower extremity muscle groups compared with balance training in persons over 75 years.


METHODS
Randomized 3-month clinical trial. Subjects (n = 110, mean age 80) were randomized to 4 groups in a 2 x 2 design (control, resistive, balance, combined resistive/balance).


METHODS
Resistive training involved knee extension and flexion, hip abduction and extension, and plantar and dorsiflexion using simple resistive machines and sandbags. Balance training consisted of exercises to improve postural control. The control group attended 5 health-related discussion sessions.


METHODS
Summed isokinetic moments (N m) of 8 leg movements: hip, knee and ankle flexion/extension, and hip abduction/adduction. Secondary outcomes were gait velocity and chair rise time.


RESULTS
Summed peak moment increased in both resistive exercise-trained groups (13% increase in the resistive group and 21% in the combined training group, P < 0.001). The effect of resistance training was significant (MANOVA F = 21.1, P < 0.001), but balance training did not improve strength, and there was no interaction (positive or negative) between balance and resistive training. Maximal gait velocity and chair rise time did not improve. Eleven subjects (20%) had musculoskeletal complaints related to resistive training, but all were able to complete the program with modifications.


CONCLUSIONS
Resistive training using simple equipment is an effective and acceptable method to increase overall leg strength in older persons. Resistive or balance training did not improve maximal gait velocity or chair rise time in this sample of relatively healthy older persons.
Judge
J O
JO
Travelers Center on Aging, University of Connecticut Health Center, Farmington 06030-5215.
Whipple
R H
RH
Wolfson
L I
LI
D000368:Aged; D001696:Biomechanical Phenomena; D005081:Exercise Therapy; D005260:Female; D005684:Gait; D015577:Geriatric Assessment; D006801:Humans; D007866:Leg / Q000502:physiology; D008297:Male; D009132:Muscles / Q000502:physiology; D010809:Physical Fitness; D004856:Postural Balance; D016059:Range of Motion, Articular; D014891:Weight Lifting / Q000502:physiology