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Environmental temperature (whether hot or cold) can have effects on athletic performance. Our previous Snippits have looked at how passive heat maintenance can be used to optimise repeat sprint performance in cooler environments.  Today’s Snippit looks at performance across both warm and cold environmental temperatures and how different combinations of passive heat maintenance and ingestion of cold slushies can be used to optimise performance.

 

Front. Physiol., 03 August 2018

https://doi.org/10.3389/fphys.2018.01064

 

Lower-Limb Passive Heat Maintenance Combined With Pre-cooling Improves Repeated Sprint Ability

 

Martyn Beaven

Liam P. Kilduff

Christian J. Cook

 

Pre-conditioning strategies to potentiate performance are a common feature of pre-competition routines. The elevation of muscle temperature is seen as a vital component of preparing for physical performance, while pre-cooling strategies have been adopted to offset fatigue during repeated efforts. We investigated the individual and combined effects of a passive heat maintenance strategy and the ingestion of an ice-water slurry on repeated sprint performance.

 

In a random cross-over design, 12 professional male athletes performed 5 × 40 m maximal running sprints under one of four conditions following a standardized warm-up: 15-min passive rest (Control); wearing a lower-body survival garment (HEAT); consuming a 500 mL ice slushy (COLD); or wearing the survival garment and consuming the slushy (H+C). Measures of sprint speed, fatigue, heart rate, and rectal temperature were collected.

 

Compared to COLD: HEAT improved Sprint 1 (ES: 0.84; p = 0.05), but negatively impacted Sprint 4 (ES: -0.87; p = 0.08), and Sprint 5 (ES: -1.57; p = 0.002). H+C was faster than Control for every sprint (ES: 0.28 to 0.66), clearly faster than COLD on Sprints 1–3 (ES: 0.73 to 0.54), and clearly faster than HEAT on Sprints 4 and 5 (ES: 1.31 and 1.87). Fatigue was greatest after the HEAT intervention with a large correlation between fatigue and rectal temperature (r = 0.66; p = 0.0204).

 

While there are undoubtedly peripheral effects of cooling and heating on various aspects of muscle function and fatigue, understanding the integration of psycho-physiological homeostatic feedback loops relating to a combined warming and cooling intervention may benefit sports in which repeat sprints are performed.

 

 

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