The purpose of this study is to determine whether load-velocity (L-V) relationship variables (L0, v0, and Aline) are sensitive indicators of fatigue produced by different squat fatigue protocols. The study aims to answer how accurately these L-V measures reflect changes in performance, particularly changes in one-repetition maximum (1RM), after varying levels of induced fatigue. Twenty-eight resistance-trained men completed three sessions involving different fatigue protocols or no training. L-V variables measured before and after each protocol were compared. The findings will help determine whether L-V relationship parameters can be used as practical and sensitive tools for monitoring fatigue during resistance training.
Who can participate
Age range18 Years – 35 Years
SexMALE
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Inclusion Criteria:
Healthy males aged 18-40 years.
Resistance-trained (minimum 2 years of regular lower-body resistance training and ≥2 sessions/week).
Able to perform a proper smith-machine back squat with correct technique.
1-RM smith-machine squat measurable and ≥ bodyweight (or specify threshold used in study).
No musculoskeletal injury of lower limbs or back in the past 6 months.
Not using performance-enhancing drugs or anabolic steroids for the past 12 months.
Willing and able to attend all testing and training sessions and provide written informed consent.
Exclusion Criteria:
Any cardiovascular, pulmonary, metabolic, or neurological disease contraindicating intense exercise.
Recent (≤6 months) lower-extremity or spinal surgery or acute injury.
Current musculoskeletal pain or injury that limits squat performance.
Use of medications that affect neuromuscular performance (e.g., systemic corticosteroids) or stimulant drugs.
Regular participation in structured lower-body rehabilitation programs.
Failure to complete familiarization or preliminary 1-RM testing.
Inability or unwillingness to provide informed consent or follow study procedures.
What they're measuring
1
Change in Theoretical Maximal Load (L0) Derived From the Load-Velocity Relationship
Timeframe: Baseline (pre-session) and immediately post-session (within 15 minutes)