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Departments of Surgery and Anesthesiology, University of Texas Medical Branch, and Metabolism Unit, Shriners Burns Institute, Galveston, Texas 77550
Received 12 February 1996; accepted in final form 10 June 1996.
Tipton, Kevin D., Arny A. Ferrando, Bradley D. Williams, and
Robert R. Wolfe. Muscle protein metabolism in female swimmers after a combination of resistance and endurance exercise.
J. Appl. Physiol. 81(5):
2034-2038, 1996.
There is little known about the responses of
muscle protein metabolism in women to exercise. Furthermore, the effect
of adding resistance training to an endurance training regimen on net
protein anabolism has not been established in either men or women. The
purpose of this study was to quantify the acute effects of combined
swimming and resistance training on protein metabolism in female
swimmers by the direct measurement of muscle protein synthesis and
whole body protein degradation. Seven collegiate female swimmers were
each studied on four separate occasions with a primed constant infusion
of
ring-[13C6]phenylalanine
(Phe) to measure the fractional synthetic rate (FSR) of the posterior
deltoid and whole body protein breakdown. Measurements were made over a
5-h period at rest and after each of three randomly ordered workouts:
1) 4,600 m of intense interval swimming (SW); 2) a whole body
resistance-training workout with no swimming on that day (RW); and
3) swimming and resistance training combined (SR). Whole body protein breakdown was similar for all treatments (0.75 ± 0.04, 0.69 ± 0.03, 0.69 ± 0.02, and 0.71 ± 0.04 µmol · min
1 · kg1
for rest, RW, SW, and SR, respectively). The FSR of the posterior deltoid was significantly greater (P < 0.05) after SR (0.082 ± 0.015%/h) than at rest (0.045 ± 0.006%/h). There was no significant difference in the FSR after RW
(0.048 ± 0.004%/h) or SW (0.064 ± 0.008%/h) from rest or from
SR. These data indicate that the combination of swimming and resistance
exercise stimulates net muscle protein synthesis above resting levels
in female swimmers.
stable isotopes; fractional synthetic rate; protein synthesis; protein breakdown; deltoid muscle
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