Aerobic capacity during two-arm and one-leg ergometric exercise

Area of Science:

• Exercise Physiology
• Sports Science
• Cardiorespiratory Fitness

Background:

• Maximal oxygen uptake (VO2 max) is a key indicator of cardiorespiratory fitness.
• Previous research indicates lower VO2 max during arm or single-leg exercise compared to two-leg cycling.

Purpose of the Study:

• To investigate and compare maximal physiological responses during two-arm cranking, one-leg cycling, and two-leg cycling in untrained males.
• To determine the relative contribution of different muscle groups to overall VO2 max.

Main Methods:

• Eight healthy untrained males performed incremental ergometric exercise tests.
• Tests included two-arm cranking, one-leg cycling, and two-leg cycling.
• Maximal oxygen uptake (VO2 max) and anaerobic threshold were measured.

Main Results:

• Two-arm cranking achieved 55% of two-leg VO2 max.
• One-leg cycling achieved 66% of two-leg VO2 max.
• Anaerobic threshold occurred at 57% VO2 max for arm exercise and 68% VO2 max for one-leg exercise.

Conclusions:

• Limited active muscle mass during arm or single-leg exercise results in lower VO2 max compared to two-leg cycling.
• Single-leg exercise may elicit a higher VO2 max than two-arm exercise when active muscle mass is a limiting factor.