Alterations in Spiking Following Muscle Fatigue in Volleyball Players

Sponsor
National Yang Ming Chiao Tung University
Study ID
NCT07687550
Status
Not Yet Recruiting

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Conditions

  • Fatigue

Eligibility Criteria

Sex
ALL
Age
18 Years - 35 Years
Healthy Volunteers
Accepted

Interventions

  • Upper Extremity Muscle Fatigue Protocol — BEHAVIORAL
    The subject performed upper extremity D2 diagonal exercise with Thera-band at kneeling position to simulate the arm movement of a volleyball spike. The movement is paced by a metronome at one beat per second, with one movement per beat. If participants could not keep up or become too fatigued, they are allowed to rest for 15 seconds before continuing. The subject was defined as fatigued, and the fatigue activity was stopped, only when all three of the following cumulative conditions were met: 1. Until the number of repetitions in that set was less than 50% of the repetitions performed in the first set. 2. Using the Rating of Perceived Exertion (RPE) on a 6-20 scale, until the subject's RPE was greater than or equal to 15. 3. If this maximum strength showed a decrease of 25% or more compared to the maximum strength measured before the fatigue activity.

Study Details

This study aims (1)to investigate the effects of repetitive functional overhead movements targeting shoulder and scapular muscles on glenohumeral and scapular kinematics and muscle activation during the arm cocking and acceleration of spiking, and changes in subacromial structures in healthy recreational volleyball players; (2) to compare these fatigue-related changes between athletes with good and poor shoulder motor control.

Key Dates

First listed
Jul 7, 2026
Start date
Jul 31, 2026
Status verified
Nov 2025
Primary completion
Jan 31, 2027
Completion
Jan 31, 2027

Study Design

Enrollment
35 participants (estimated)

Arms

  • Arm: Poor shoulder motor control
    During shoulder medial rotation up to 60° in supine position, the scapula forward tilts or elevation occurs, difficulties in breathing, performing difficulties, unable to perform 60° medial rotation, glenohumeral anterior translation, fatigue, the need of external feedback and external support.
  • Arm: Good shoulder motor control
    During shoulder medial rotation up to 60° in supine position, no scapula and glenohumeral compensation, easy to breathing and perform 60° medial rotation without external feedback and external support.

Primary Outcome Measure

Degree of the glenohumeral and scapulothoracic joint during spiking [ Time Frame: Baseline, immediately post-intervention (Day 1) ]

Central Contacts

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