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Hiroo Matsuse, MD; Naoto Shiba, MD; Yoshio Takano, MD;

This pilot study compares the metabolic cost of cycling exercise using a hybrid training system (HTS) with added resistance from electrically stimulated antagonist muscle contractions, versus unloaded cycling exercise. The study aims to determine the effectiveness of HTS in improving muscle hypertrophy and strength in males by analyzing oxygen uptake, carbon dioxide output, ventilation, respiratory exchange ratio, and heart rate. The results show a significant increase in metabolic parameters during cycling with the HTS compared to unloaded cycling exercise. The findings suggest that combining volitional contractions with electrical stimulation can enhance metabolic expenditure, making HTS a potential resistance training tool.

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Hiroo Matsuse, MD; Naoto Shiba, MD; Yoshio Takano, MD;

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  1. Cycling exercise to resist electrically stimulated antagonist increasesoxygen uptake in males: Pilot study Hiroo Matsuse, MD; Naoto Shiba, MD; Yoshio Takano, MD; Shin Yamada, MD; Hiroshi Ohshima, MD; Yoshihiko Tagawa, PhD

  2. Aim • Compare metabolic cost of : • Cycling exercise using hybrid training system (HTS) as added resistance (HTC test). • Unloaded cycling exercise (ULC test). • Relevance • HTS uses electrically stimulated eccentric antagonist muscle contractions as resistance to voluntary agonist muscle contractions and may improve muscle hypertrophy and strength.

  3. Method • 12 male subjects exercised on leg cycle ergometer. • After 5 min rest and 5 min warm up, they performed ULC or HTC for 5 min. • Steady state of oxygen uptake (VO2), carbon dioxide output (VCO2), expired ventilation (VE), respiratory exchange ratio (RER), and heart rate (HR) were measured. Hamstring was stimulated during knee extension and quadriceps was stimulated during knee flexion. Subjects pedaled against force generated by electrically stimulated antagonist.

  4. Results • VO2, VCO2, VE, and HR: • Significantly greater during HTC than ULC. • Relative VO2: • During ULC: 16.7% ± 2.1% of peak VO2. • During HTC: 21.1% ± 3.4% of peak VO2. • RER: • No significant difference between ULC and HTC.

  5. Conclusion • Findings indicate that combined application of volitional contractions and electrical stimulation could lead to greater increase in metabolic cost. • HTS seems to be applicable as a resistance of motion.

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