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Area of Science:

  • Exercise Physiology
  • Rehabilitation Technology
  • Metabolic Studies

Background:

  • Neuromuscular electrical stimulation (NMES) is recognized for its benefits in muscle strength and metabolism.
  • Hybrid training systems (HTS) integrate NMES with voluntary exercise, potentially augmenting exercise intensity.

Purpose of the Study:

  • To assess the metabolic cost and cardiovascular response during walking exercise combined with HTS.
  • To determine if HTS increases exercise load during aerobic walking.

Main Methods:

  • Fifteen subjects performed 5-minute walking trials at 4 km/h and 5.6 km/h on a treadmill.
  • Trials were conducted with HTS (HTSW) and without HTS (CON) on separate days.
  • Oxygen uptake (VO2) and heart rate (HR) were measured to evaluate metabolic cost and cardiovascular load.

Main Results:

  • HTSW significantly increased VO2 compared to CON at both 4 km/h (16.6 vs 15.3 ml/min/kg) and 5.6 km/h (21.0 vs 19.4 ml/min/kg).
  • HR was also significantly higher during HTSW at both speeds (4 km/h: 106.7 vs 101.7 bpm; 5.6 km/h: 126.5 vs 121.5 bpm).
  • HTS increased the overall exercise load by 8.3% at 4 km/h and 9.1% at 5.6 km/h.

Conclusions:

  • Hybrid training systems effectively increase the metabolic cost and cardiovascular demand of aerobic walking exercise.
  • HTS may be a valuable tool for health promotion by enhancing exercise intensity without a perceived increase in difficulty.