Mean Propulsive Velocity Is a Viable Method for Adjusting the Resistance-Training Load at Moderate Altitude

Area of Science:

• Sports Science
• Altitude Training
• Exercise Physiology

Background:

• Resistance training (RT) at moderate altitude presents unique physiological challenges.
• Optimizing external load prescription is crucial for effective training in hypoxic environments.
• Mean propulsive velocity (MPV) offers a velocity-based method for load adjustment.

Purpose of the Study:

• To evaluate the efficacy of MPV in adjusting external load during RT at moderate altitude.
• To compare training outcomes and physiological responses between normoxic and intermittent hypobaric hypoxic conditions.
• To assess the relationship between external load, velocity loss, and perceived exertion.

Main Methods:

• Twenty-four volunteers participated in a 4-week RT program under normoxia (690 m) or intermittent hypobaric hypoxia (IH, 2,320 m).
• External load was adjusted to maintain a constant MPV of 1 m·s⁻¹ during countermovement jumps (CMJ).
• Relative peak power output (P_rel), velocity loss (VL), and rating of perceived exertion (RPE) were measured.

Main Results:

• Higher absolute loads were lifted in IH (75.6 kg) compared to normoxia (58.5 kg).
• Both groups showed similar relative increases in performance (IH: 8.2%, N: 9.8%) with no significant difference in VL.
• Post-study P_rel improved significantly in IH (+7% W·kg⁻¹), and mean RPE was higher in IH (6.8) vs. N (5.6).

Conclusions:

• MPV is a viable method for adjusting external load during RT at moderate altitude.
• RT at moderate altitude increases perceived exertion, necessitating internal load monitoring.
• Combining MPV with RPE provides a comprehensive approach to managing training stress in hypoxic environments.