Benjamin M Nazaroff1,2,3, Gregory E P Pearcey1,4,5, Bridget Munro6, E Paul Zehr7,8,9,10,11. 1. Rehabilitation Neuroscience Laboratory, University of Victoria, Victoria, BC, Canada. 2. Human Discovery Science, International Collaboration On Repair Discoveries (ICORD), Vancouver, BC, Canada. 3. Centre for Biomedical Research, University of Victoria, Victoria, BC, Canada. 4. Departments of Neuroscience and Physical Medicine and Rehabilitation, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA. 5. School of Human Kinetics and Recreation, Memorial University of Newfoundland, St. John's, NL, Canada. 6. Nike Sports Research Laboratory, NIKE Inc., Beaverton, OR, USA. 7. Rehabilitation Neuroscience Laboratory, University of Victoria, Victoria, BC, Canada. pzehr@uvic.ca. 8. Human Discovery Science, International Collaboration On Repair Discoveries (ICORD), Vancouver, BC, Canada. pzehr@uvic.ca. 9. Centre for Biomedical Research, University of Victoria, Victoria, BC, Canada. pzehr@uvic.ca. 10. Division of Medical Sciences, University of Victoria, Victoria, BC, Canada. pzehr@uvic.ca. 11. Zanshin Consulting, Inc., Victoria, BC, Canada. pzehr@uvic.ca.
Abstract
PURPOSE: In sport and exercise, warm-ups induce various physiological changes that facilitate subsequent performance. We have shown that delivering patterned stimulation to cutaneous afferents during sprint cycling mitigates fatigue-related decrements in performance, and that repeated sensory stimulation amplifies spinal reflex excitability. Therefore, the purpose of this study was to assess whether sensory enhancement of warm-up would affect subsequent high-intensity arm cycling performance. METHODS: Participants completed three experimental sessions, in which they randomly performed either a control, stim, or sleeve warm-up condition prior to maximal duration arm cycling. During the control condition, warmup consisted of low-intensity arm cycling for 15 min. The stim condition was the same, except they received alternating pulses (400 ms, 50 Hz) of stimulation just above their perceptual threshold to the wrists during warm-up. The third condition required participants to wear custom fabricated compression sleeves around the elbow during warm-up. Grip strength and spinal reflex excitability were measured before and after each warm-up and fatigue protocol, which required participants to arm cycle at 85% of peak power output until they reached volitional fatigue. Peak power output was determined during an incremental test at minimum 72 h prior to the first session. RESULTS: Both sensory enhanced warm-up conditions amplified subsequent high-intensity arm cycling performance by ~ 30%. Additionally, the stim and sleeve warm-up conditions yielded improvements in grip strength (increased by ~ 5%) immediately after the sensory enhanced warm-ups. Ergogenic benefits from the sensory enhanced warm-up conditions did not differ between one another. CONCLUSION: These findings demonstrate that enhanced sensory input during warm-up can elicit improvements in both maximal and submaximal performance measures.
PURPOSE: In sport and exercise, warm-ups induce various physiological changes that facilitate subsequent performance. We have shown that delivering patterned stimulation to cutaneous afferents during sprint cycling mitigates fatigue-related decrements in performance, and that repeated sensory stimulation amplifies spinal reflex excitability. Therefore, the purpose of this study was to assess whether sensory enhancement of warm-up would affect subsequent high-intensity arm cycling performance. METHODS: Participants completed three experimental sessions, in which they randomly performed either a control, stim, or sleeve warm-up condition prior to maximal duration arm cycling. During the control condition, warmup consisted of low-intensity arm cycling for 15 min. The stim condition was the same, except they received alternating pulses (400 ms, 50 Hz) of stimulation just above their perceptual threshold to the wrists during warm-up. The third condition required participants to wear custom fabricated compression sleeves around the elbow during warm-up. Grip strength and spinal reflex excitability were measured before and after each warm-up and fatigue protocol, which required participants to arm cycle at 85% of peak power output until they reached volitional fatigue. Peak power output was determined during an incremental test at minimum 72 h prior to the first session. RESULTS: Both sensory enhanced warm-up conditions amplified subsequent high-intensity arm cycling performance by ~ 30%. Additionally, the stim and sleeve warm-up conditions yielded improvements in grip strength (increased by ~ 5%) immediately after the sensory enhanced warm-ups. Ergogenic benefits from the sensory enhanced warm-up conditions did not differ between one another. CONCLUSION: These findings demonstrate that enhanced sensory input during warm-up can elicit improvements in both maximal and submaximal performance measures.
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