Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
Ios-APP Journal of Sports Science and Medicine
Androit-APP Journal of Sports Science and Medicine
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©Journal of Sports Science and Medicine ( 2017 ) 16 , 391 - 395

Research article
Moderate Intensity Cycling Exercise after Upper Extremity Resistance Training Interferes Response to Muscle Hypertrophy but Not Strength Gains
Shigeto Tomiya1, Naoki Kikuchi2, , Koichi Nakazato3
Author Information
1 Faculty of Health Sciences, Kyorin University, Tokyo, Japan
2 Department of Training Science, Nippon Sport Science University, Tokyo, Japan
3 epartment of Exercise Physiology, Nippon Sport Science University, Tokyo, Japan

Naoki Kikuchi
✉ PhD, CSCS*D Department of Training Science, Nippon Sport Science University 158-8508, 7-1-1, Fukasawa, Setagaya-ku, Tokyo, Japan
Email: n.kikuchi@nittai.ac.jp
Publish Date
Received: 19-04-2017
Accepted: 06-07-2017
Published (online): 08-08-2017
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ABSTRACT

The purpose of the present study was to examine the effect of 30-min moderate intensity cycling exercise immediately after upper-body resistance training on the muscle hypertrophy and strength gain. Fourteen subjects were randomly divided between two groups. One group performed moderate intensity (55% of maximum oxygen consumption [VO2max], 30 min) cycle training immediately after arm resistance training as concurrent training (CT; n = 7, age: 21.8 ± 0.7 years, height: 1.68 ± 0.06 m, weight: 60.3 ± 7.4 kg); the second group performed the same endurance and arm RT on separate days as control group (SEP; n=7, age: 22.1 ± 0.7 years, height: 1.76 ± 0.05 m, weight: 63.8 ± 3.6 kg). The supervised progressive RT program was designed to induce muscular hypertrophy (3-5 sets of 10 repetitions) with bilateral arm-curl exercise using 75% of the one repetition maximum (1RM) with 2-min rest intervals. The RT program was performed for 8 weeks, twice per week. Muscle cross-sectional area (CSA), 1RM, and VO2max were measured pre- and post-training. Significant increases in muscle CSA from pre- to post-training were observed in both the SEP (p = 0.001, effect size [ES] = 0.84) and the CT groups (p = 0.004, ES = 0.45). A significant increase in 1RM from pre- to post-training was observed in the SEP (p = 0.025, ES = 0.91) and CT groups (p = 0.001, ES = 2.38). There were no interaction effects (time × group) for CSA, 1RM, or VO2max. A significantly higher percentage change of CSA was observed in the SEP group (12.1 ± 4.9%) compared to the CT group (5.0 ± 2.7%, p = 0.029), but no significant difference was observed in the 1RM (SEP: 19.8 ± 16.8%, CT: 24.3 ± 11.1%). The data suggest that significant improvement of CSA and strength can be expected with progressive resistance training with subsequent endurance exercise performed immediately or on a different day. Changes in CSA might be affected by subsequent cycling exercise after 8 weeks of training.

Key words: Concurrent training, systemic, strength, muscle hypertrophy, arm-curl exercise


           Key Points
  • Moderate intensity cycling exercise immediately after upper-body resistance training influences the magnitude of muscle hypertrophy and relative value of CSA changes.
  • There was no statistically significant difference in the % change in 1RM between groups after concurrent strength training and moderate intensity endurance training.
  • Timing of endurance training could alter the degree of muscular growth induced by resistance training.
 
 
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