The Claim
Isometric handgrip strength in highly trained male tennis players does not differ significantly between morning (9:00 h) and afternoon (16:30 h) testing sessions.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
In highly trained male tennis players, handgrip strength measured in the morning is the same as handgrip strength measured in the afternoon.
See the scientific wording
Isometric handgrip strength in highly trained male tennis players is not significantly affected by time of day, as no difference was observed between morning (9:00 h) and afternoon (16:30 h) testing (P = 0.891), suggesting that some neuromuscular functions are resilient to circadian variation.
The nervous system maintains consistent muscle force output during handgrip tasks regardless of time of day because the brain and spinal cord send the same level of signals to the muscles, and the muscles respond with the same strength whether it is morning or afternoon.
What the research says
1 studyStudy: Circadian rhythm effect on physical tennis performance in trained male players
For top tennis players, squeezing a handgrip device is just as strong in the morning as it is in the afternoon—time of day doesn’t affect it, even though other skills like serving or sprinting get better later in the day.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.