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Ten weeks of combined strength and endurance training resulted in significant .... The extensor muscles of the knee were selected as the muscle group to.
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AD-A261 059 /JI/iIIII //IIIII II/I/I/IhIII/III/I/

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COMBINED STRENGTH AND ENDURANCE TRAINING: FUNCTIONAL AND MORPHOLOGICAL ADAPTATIONS TO TEN WEEKS OF TRAINING

J. McCarthy

P. Griffth W. K. Prusaczyk H. W. Goforth A. Vailas

DTIC ELECTE MAR 0 9 1993

Report No. 92-26

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Approved for public release: distribution unlimited.

NAVAL HEALTH RESEARCH CENTER P.O. BOX 85122 SAN DIEGO, CALIFORNIA 92186-5122 NAVAL MEDICAL RESEARCH AND DEVELOPMENT COMMAND BETHESDA, MARYLAND

Combined Strength and Endurance Training: Functional and Morphological Adaptations

to Ten Weeks of Training

J.

McCarthy, H.W.

Ph.D.',

P.

Goforth,

Griffith, Jr.,

M.S.2,

W.K.

Ph.D. 3 , and A.

Prusaczyk,

Vailas,

Ph.D.2,

Ph.D.'

Report 92-26, supported by the Naval Medical Research and Development Command, Department of the Navy under work unit 62233N MM33P30.002-6005. The views expressed in this article are those of the author(s) and do not reflect the official policy or position of the Department of the Navy, the Department of Defense, or the U.S. Government. Approved for public release; distribution is unlimited.

Department of Physical Education and Dance. 2(?O) Ohs.,e'vahory Drive. University of Wisconsin. Madison. Wisconsin 53706

"

Geo-Centers. Inc.. 10903 Indian Head Highway. Fort Washingion. Maryland 20744

SNaval

Health Research Center. P.O Box 85122. San Diego. California 92186-5122

KEY FINDINGS

"* Ten

weeks of combined strength and endurance training resulted in significant increases in peak oxygen uptake, muscular strength and power, and muscle hypertrophy.

"*Functional

and morphological adaptations resulting from combined strength and endurance training are similar to those occurring when either strength or endurance training are performed alone.

9 Gains in strength/power development are not impaired or slow training at fast strength and endurance velocities, compared to strength-only training.

by combined contraction

"*Gains

in peak oxygen uptake are not inhibited by combined strength and endurance training, compared to endurance-only training.

"*Gains

in upper body strength and muscle hypertrophy are not inhibited when a three-day-per-week lower body endurance training program is added.

"• The

results from combined training studies appear to be influenced by training mode, intensity, volume, frequency, and the method of integration of the two training programs.

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SUMMARY Problem Strength and endurance training are often combined by military personnel for tasks requiring multiple physical demands such as endurance, explosive

power.

While

the

literature

suggests

strength

strength,

development

inhibited when endurance and strength training programs are combined, information on their the U.S.

compatibility is

Navy SEALs must

limited and inconclusive.

also consider

within the limited physical

combining these

and

can

be

scientific

Groups such as

two forms

of exercise

training time available.

Obiective The

purpose

endurance

of

training

this

study

programs,

was

to

examine

individually

and

the

in

effects

of

combination,

strength

and

on performance

changes and associated muscle adaptations. Approach Sedentary groups:

males

(n=30)

strength-only

(STR),

endurance (COM). training

were

randomly

assigned to one of

endurance-only

(END),

or

consisted in

of

select

both the strength

upper

and

lower

body

resistance

strength,

(CT)

Strength exercises.

Subjects in

COM

and peak oxygen uptake (cycling) were

biopsies were taken from the vastus lateralis

computed tomography

and

and endurance training programs on the same day.

Anthropometric characteristics, measured;

strength

Subjects trained three days per week for ten weeks.

Endurance training consisted of continuous cycling for 50 min. engaged

three training

combined

muscle;

scans were performed before and after

and mid-thigh

training.

Results Groups

STR

and

COM

repetition maximum squat (6%,

9%);

in

14%)

peak

(23%,

lean body weight (3%,

muscle fiber area (24%, (12%,

showed

and flexor (7%, oxygen

uptake

22%)

significant

(p